Version 1.4.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
2017-08-11 19:57:57 +09:00 · 2017-08-11 19:50:56 +09:00 · 2017-08-03 20:48:13 +09:00 · 2017-08-02 14:19:10 +09:00 · 2017-07-07 15:46:37 +09:00 · 2017-07-06 16:06:46 +09:00
93 changed files with 13775 additions and 2983 deletions
--- a/35
+++ b/35
@@ -2,6 +2,10 @@ Aidan Thornton:
    Added Maple Mini support.
 	board/board-maple-mini.h

+Jeremy Drake:
+    Modified STM32F103 support.
+	mcu/sys-stm32f103.c
+
 Kaz Kojima:
    Added STM32 Primer2 support.
 	board/board-stm32-primer2.h
@@ -22,16 +26,33 @@ Mateusz Zalega:
 	board/board-nitrokey-start.h

 NIIBE Yutaka:
-    Write the library:
-	chopstx.c, eventflag.c, entry.c, clk_gpio_init.c
+    Wrote the library:
+	chopstx.c, entry.c, eventflag.c,
        chopstx.h, eventflag.h
-    Draw the logo:
+    Wrote the drivers mcu/*:
+    	clk_gpio_init-mkl27z.c, clk_gpio_init-stm32.c,
+	sys-stm32f103.c, sys-stm32f030.c, sys-mkl27z.c,
+	adc-stm32f103.c, adc-mkl27z.c
+    Drew the logo:
 	chopstx.svg, chopstx.png
-    Write examples:
-        example-led, example-cdc, example-fsm-55
-    Write board:
+    Wrote examples:
+        example-led, example-cdc, example-fsm-55, example-fs-bb48
+    Wrote board/*:
        board-fst-01.h, board-fst-01-00.h,
 	board-olimex-stm32-h103.h, board-stm8s-discovery.h
 	board-cq-starm.h, board-stbee-mini.h, board-stbee.h,

-	board-stm32f0-discovery.h, board-fsm-55.h
+	board-stm32f0-discovery.h, board-fsm-55.h,
+
+	board-fs-bb48.h
+
+    Under contract of g10 Code GmbH, wrote:
+        mcu/usb-usbip.c
+
+Paul Fertser:
+    Added Blue Pill support.
+	board/board-blue-pill.h
+
+Szczepan Zalega:
+    Modified Nitrokey-Start support.
+	board/board-nitrokey-start.h
--- a/586
+++ b/586
@@ -1,3 +1,583 @@
+2017-08-11  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 1.4.
+	* doc/chopstx.texi (VERSION): 1.4.
+
+2017-08-03  Jeremy Drake <jeremydrake+gnuk@eacceleration.com>
+
+	* mcu/sys-stm32f103.c (flash_write): Allow compile time
+	flash size definition by STM32F103_OVERRIDE_FLASH_SIZE_KB.
+
+2017-08-02  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* contrib/adc-gnu-linux.c: New.
+
+2017-07-07  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-usbip.c (usbip_handle_data_urb): Fix error return value.
+	(notify_hostcontroller): New.
+	(usb_lld_stall_tx, usb_lld_stall_rx): Notify host controller side.
+
+2017-07-06  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-usbip.c (hc_handle_data_urb): Fix the condition of the
+	end of transaction.
+	(read_data_transaction): Allow partial read by host.
+
+2017-07-05  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-fraucheky: New.
+
+2017-06-28  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-usbip.c (struct usbip_msg_cmd, struct usbip_msg_rep):
+	Use different struct for command and reply.
+
+2017-06-27  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-cdc-gnu-linux/README: New.
+
+2017-06-26  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* board/board-gnu-linux.h: New.
+
+	* mcu/usb-usbip.c: New.
+
+	* rules.mk: Support EMULATION.
+
+	* entry.c (main): Support GNU_LINUX_EMULATION.
+
+2017-06-23  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx-gnu-linux.c, chopstx-gnu-linux.h: New.
+
+	* chopstx.c (chx_init): Use chx_init_arch.
+	(chopstx_create): Use chopstx_create_arch.
+	(chx_systick_reset, chx_systick_reload, chx_systick_get)
+	(usec_to_ticks, chx_enable_intr, chx_clr_intr, chx_disable_intr)
+	(chx_set_intr_prio, chx_prio_init, chx_cpu_sched_lock)
+	(chx_cpu_sched_unlock, idle, chx_handle_intr)
+	(chx_request_preemption, chx_sched, preempt, svc): Move to...
+	* chopstx-cortex-m.c: ... here.
+	(chx_init_arch, chopstx_create_arch): New.
+	* chopstx-cortex-m.h: New for tcontext_t.
+
+2017-06-22  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_sched): Use ->V for return value.
+	(svc): Ditto.
+	(chx_wakeup): Set -> for the return value of chx_sched.
+	(chopstx_mutex_lock, chopstx_cancel): Likewise.
+	(chopstx_exit): Remove naked attribute.
+
+2017-06-21  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (struct chx_pq): Use uintptr_t for V.
+	(struct chx_px): Likewise.
+	(struct chx_thread): Likewise.
+	(chx_sched): Use uintptr_t for the return value.
+	(chx_exit): Use the field V for holding exit value.
+	(chopstx_create): Use uintptr_t for STACK_ADDR.
+	(chopstx_join): Use the field V for exit value.
+
+2017-06-16  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_wakeup): Fix for RUNNING==NULL.
+
+	* mcu/usb-mkl27z.c (std_get_status): Use staic var, not auto.
+
+2017-05-18  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_wakeup): Fix access to REG_R0.
+
+2017-02-02  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 1.3.
+	* doc/chopstx.texi (VERSION): 1.3.
+
+2017-02-01  Paul Fertser <fercerpav@gmail.com>
+
+	* board/board-blue-pill.h: New.
+
+2016-12-08  Szczepan Zalega <szczepan@nitrokey.com>
+
+	* board/board-nitrokey-start.h (VAL_GPIO_USB_ODR): Switch off red
+	LED for Nitrokey Start.
+
+2016-10-13  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 1.2.
+	* doc/chopstx.texi (VERSION): 1.2.
+
+2016-10-12  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chopstx_join, chopstx_cancel): chopstx_join is
+	cancellation point.
+
+2016-07-11  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/stm32f103.h: Add more from Gnuk 1.1.9.
+	* example-cdc, example-fs-bb48, example-fsm-55, example-led:
+	Update for stack addr/size.
+
+2016-07-01  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 1.1.
+	* doc/chopstx.texi (VERSION): 1.1.
+
+	* chopstx.c (chopstx_setpriority): Change the API.
+
+2016-06-30  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/usb-cdc.c (tty_recv, tty_main): Follow the change of
+	chopstx_poll.
+
+2016-06-29  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-fs-bb48: Update.
+	* example-fs-bb48/touch.c: New.
+
+	* chopstx.c (chopstx_setpriority): Fix sched_lock/unlock.
+
+2016-06-28  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.h (struct chx_poll_head): Declare here.
+
+	* chopstx.c (chopstx_poll): Don't use varargs, but use
+	an array of pointer.
+	(chopstx_intr_wait): Follow the change of chopstx_poll.
+	* eventflag.c (eventflag_wait_timeout): Likewise.
+	* contrib/adc-stm32f103.c (adc_wait_completion): Likewise.
+	* contrib/adc-mkl27z.c (adc_wait_completion): Likewise.
+
+2016-06-16  Niibe Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 1.0.
+	* doc/chopstx.texi (VERSION): 1.0.
+
+	* board/board-fst-01g.h: New.
+
+2016-06-15  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chopstx_exit): Add "naked" attribute.
+
+2016-06-14  Niibe Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-stm32f103.c (usb_lld_ctrl_recv): Fix the state and make
+	the endpoint 0 RX_VALID.
+
+2016-06-10  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* usb_lld.h (USB_EVENT_OK): Rename.
+	* mcu/usb-stm32f103.c: Update.
+	* mcu/usb-mkl27z.c: Likewise.
+
+	* example-cdc/usb-cdc.c: Follow the change of API.
+	* example-fs-bb48/usb-cdc.c: Likewise.
+
+2016-06-09  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-stm32f103.c (usb_lld_ctrl_recv): Rename.
+	(usb_lld_ctrl_send): Rename.
+	(usb_lld_ctrl_ack): Rename and let have return value.
+	* mcu/usb-mkl27z.c: Likewise.
+
+	* example-cdc/usb-cdc.c: Follow the change of API.
+	* example-fs-bb48/usb-cdc.c: Likewise.
+
+2016-06-08  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-stm32f103.c: Rewrite to be event driven API.
+	* mcu/usb-mkl27z.c: Likewise.
+
+	* example-cdc/usb-cdc.c: Update to new USB API.
+	* example-fs-bb48/usb-cdc.c: Likewise.
+
+	* example-cdc/tty.h: Change tty API to be C string (char*)
+	friendly.
+	* example-fs-bb48/tty.h: Ditto.
+
+2016-06-02  Niibe Yutaka  <gniibe@fsij.org>
+
+	* contrib/adc-mkl27z.c: Move from mcu.
+	* contrib/adc-stm32f103.c: Move from mcu.
+
+	* example-led/Makefile (CHIP): Define as stm32f0.
+
+	* mcu/sys-stm32f0.h: Rename from sys-stm32f030.h,
+	as we share it among STM32F030 and STM32F050.
+	* mcu/sys-stm32f0.c: Likewise.
+
+	* board/board-stm32f0-discovery.h (MCU_STM32F0): Define.
+
+	* sys.h: Support STM32F0.
+
+2016-06-01  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.h (chx_fatal): Remove weak attribute from declaration.
+	* chopstx.c (chx_fatal): Add weak attribute to implementation.
+
+2016-05-31  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 0.12.
+	* doc/chopstx.texi (VERSION): 0.12.
+
+	* sys.h: New.
+
+	* example-cdc, example-fs-bb48: Update.
+	* example-fsm-55, example-led: Update.
+
+2016-05-30  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-stm32f103.c (usb_lld_setup_endpoint): Start with
+	EP_RX_NAK.
+
+	* mcu/usb-mkl27z.c (handle_transaction): Handle NAK case.
+	(usb_lld_setup_endp): Rename from usb_lld_setup_endpoint.
+	(usb_lld_rx_enable_buf): Rename from usb_lld_rx_enable.
+	(usb_lld_tx_enable_buf): Rename from usb_lld_tx_enable.
+
+	* mcu/adc-stm32f103.c: New from NeuG.
+	* mcu/stm32f103.h: New from NeuG.
+
+	* example-cdc: Update.
+
+2016-05-30  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/adc-mkl27z.c, mcu/sys-mkl27z.c, mcu/usb-mkl27z.c: Moved from
+	example-fs-bb48.
+
+	* mcu/adc-stm32f103.c, mcu/sys-stm32f103.c, mcu/usb-stm32f103.c:
+	Moved from example-cdc.
+
+2016-05-30  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-fs-bb48/sys.c (flash_do_internal, flash_do)
+	(flash_erase_page, flash_program_word): New.
+	* example-fs-bb48/command.c (cmd_fes, cmd_fww): New.
+
+2016-05-27  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-fs-bb48/command.c (cmd_sysinfo): New.
+	* example-fs-bb48/sample.ld: Update.
+	* example-fs-bb48/sys.h: New.
+	Move crc32 functions declarations here.
+	* example-fs-bb48/sys.c: Rename from first-pages.c.
+	Include mcu/clk_gpio_init-kl.c to define clock_init and
+	gpio_init.
+	(set_led): New.
+	(reset): Initialize MSP.
+	(flash_config): Include comparison key.
+	(crc32_init, crc32_u8, crc32_u32): Change the API.
+	Write them in assembler so that the size of functions
+	keep unchanged.
+	(sys_version, sys_board_id, sys_board_name, sys_vector): New.
+
+2016-05-26  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* entry.c: Follow the move of clk_gpio_init*.c
+	* example-cdc/sys.c: Likewise.
+	* example-led/sys.c: Likewise.  Update to 3.0.
+	* example-primer2/sys.c: Update.
+
+	* mcu/clk_gpio_init-stm32.c: Moved.
+	* mcu/clk_gpio_init-kl.c: Moved.
+	* mcu/kl_sim.h: New (was in example-fs-bb48).
+
+	* example-fs-bb48/adc_kl27z.c: Use DMA0 and DMA1.
+	* example-fs-bb48/adc_kl27z.c (adc_wait_completion): Use only
+	least significant 8-bit (most significant for randomness).
+	* example-fs-bb48/command.c (cmd_adc): Rename from
+	cmd_temperature.
+
+2016-05-24  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-fs-bb48/command.c: New.
+	* example-fs-bb48: Update example CDC device.
+
+2016-05-23  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopst.x (chx_sched) [__ARM_ARCH_6M__]: Maintain PSR.
+
+2016-05-23  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chopstx_poll): Fix a race.  Check COUNTER.
+
+	* example-cdc/usb-cdc.c (tty_input_char): Include newline.
+	* example-cdc/sample.c: Handle newline.
+
+	* example-fs-bb48/usb-cdc.c: Update from example-cdc.
+	* example-fs-bb48/tty.h: Likewise.
+	* example-fs-bb48/sample.c: Follow the change.
+
+2016-05-20  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chopstx_usec_wait_var): internal function.
+	(chopstx_wakeup_usec_wait): Remove.
+
+2016-05-19  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 0.11.
+	* doc/chopstx.texi (VERSION): 0.11.
+
+2016-05-18  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* eventflag.c: Update using chopstx_poll and offer API for poll.
+
+	* chopstx.c (requeue): New.
+	(chopstx_mutex_lock, chopstx_join): Fix by requeue.
+	(chopstx_main_init): Remove.
+	(chopstx_setpriority): New.
+
+	* example-cdc/usb-cdc.c: Prepare for multiple TTYs.
+
+2016-05-17  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/usb-cdc.c: Update as TTY input/output with line
+	editing support.
+	* example-cdc/sample.c: Likewise.
+	* example-cdc/tty.h: Rename from stream.h.
+
+	* chopstx.c (chopstx_poll): Set ->ready = 0.
+	Add spinlock for ll_dequeue.
+
+2016-05-16  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/sys.c (nvic_enable_vector): Remove.
+	(usb_lld_sys_init): Don't setup NVIC priority.
+	(sys_version): sys version 3.0.
+
+2016-05-16  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.h (CHOPSTX_EXIT_SUCCESS, CHOPSTX_EXIT_CANCELED)
+	(CHOPSTX_EXIT_CANCELED_IN_SYNC): Remove.
+	(CHOPSTX_CANCELED): New.
+
+	* chopstx.c (chopstx_testcancel): Use CHOPSTX_CANCELED.
+	(chx_sched, chx_snooze): Re-define return values cleanly.
+	(chopstx_cancel): Use return value of chx_sched to cancel.
+	(chopstx_cond_wait, chopstx_join, chopstx_poll): Implement
+	cancellation rather easier way with return value of chx_sched.
+
+2016-05-15  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chopstx_claim_irq): Don't register clean up function.
+	(chx_release_irq): Remove.
+	(chopstx_cancel): Disable IRQ when canceled at POLL.
+	(chopstx_poll): Fix IRQ handling.
+
+2016-05-13  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_handle_intr): Call chx_request_preemption.
+	(chx_wakeup, chopstx_cond_signal, chopstx_cond_broadcast)
+	(chx_intr_hook, chopstx_poll): Cleanup.
+
+2016-05-13  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chopstx_exit): Don't call chx_release_irq_thread.
+	(chx_release_irq_thread): Remove.
+	(q_intr): New variable.
+	(intr_top): Remove.
+	(chx_handle_intr, chx_init, chopstx_claim_irq)
+	(chopstx_intr_wait): Use Q_INTR.
+	(chx_intr_hook): New.
+	(chopstx_poll): Support CHOPSTX_POLL_INTR.
+	(chopstx_release_irq): Remove.
+	(chx_release_irq): New internal function.
+	(THREAD_WAIT_INT): Remove.
+	(chopstx_intr_wait): Rewrite by chopstx_poll.
+
+2016-05-13  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_sched) [__ARM_ARCH_6M__]: Fix asm.
+	(chx_handle_intr, chx_wakeup, chopstx_cancel): Fix for polling
+	with no timeout.
+
+	* example-cdc/sample.c (main): Update chopstx_poll example.
+	* example-fs-bb48/sample.c (main): Ditto.
+
+	* chopstx.c (struct chx_px): Add READY_P and LOCK.
+	(chx_proxy_init): Add initialization of new members.
+	(chx_wakeup): Spinlock PX.
+	(chopstx_mutex_lock): Add protection by splinlock.
+	(chx_cond_hook, chx_join_hook): Change arguments.
+	(chx_cond_unhook, chx_join_unhook): Remove.
+	(chopstx_claim_irq): Compatible to chx_poll.
+	(chopstx_join): Fix spinlocking.
+	(chopstx_cancel): Fix spinlocking.
+
+2016-05-12  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/sample.c: Update using chopstx_poll.
+	* example-cdc/sample.ld: Likewise.
+	* example-cdc/stream.h: Likewise.
+	* example-cdc/usb-cdc.c: Likewise.
+
+	* chopstx.c (chopstx_mutex_init): Initialize OWNER, too.
+	(preempt) [__ARM_ARCH_7M__]: Bug fix for register 0 to inhibit
+	scheduling.
+	(chx_sched) [__ARM_ARCH_6M__]: Return YIELD normally.
+	(MAX_USEC_FOR_TIMER): Guarantee 24-bit tick.
+	(chx_snooze): Revert the change of 2016-04-24 and modify
+	chopstx_poll instead.
+	(chopstx_poll): Support waiting forever.
+
+2016-04-24  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_snooze): Wait forever when it's POLL and usec==0.
+
+2016-04-22  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-fs-bb48/first-pages.c: Rename from reset.c and merge
+	crc32.c.
+	* example-fs-bb48/sample.ld: Define section for first two pages.
+	* example-fs-bb48/usb_kl27z.c (__usb_buf__): Remove.
+
+	* chopstx.c (chx_cond_hook): Rename from chopstx_cond_hook and make
+	it internal.
+	(chx_cond_unhook): Likewise.
+	(chx_join_hook, chx_join_unhook): New.
+	(chopstx_poll): Change API, not exposing internals of hook/unhook.
+
+	* example-fs-bb48/sample.c (main): Follow the API change of
+	chopstx_poll.
+
+2016-04-21  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_snooze, chx_wakeup): New.
+	(chopstx_cond_hook, chopstx_cond_unhook): New.
+	(chopstx_cond_signal, chopstx_cond_broadcast): Fix for poll.
+	(chx_proxy_init): Initialize with RUNNING.
+	(chopstx_poll): Fix with chx_snooze.
+	(chx_exit): Use chx_wakeup.
+
+	* example-fs-bb48/sample.c (main): Update with chopstx_poll.
+	* example-fs-bb48/usb-cdc.c (stream_recv): Fix the loop clear
+	FLAG_RECV_AVAIL only after we process it.
+
+2016-04-20  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/usb_stm32f103.c (usb_lld_reset): Supply FEATURE
+	argument.  Call usb_lld_set_configuration internally and set
+	FEATURE.
+	(usb_lld_set_feature): Remove.
+	* example-cdc/usb-cdc.c (usb_cb_device_reset): Update with new
+	API.
+
+	* example-cdc/sys.c: Include clk_gpio_init-stm32.c.
+	* example-led/sys.c, example-primer2/sys.c: Ditto.
+
+2016-04-19  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-fs-bb48/sample.c (main): Change the example to display
+	CRC32 value from input line.
+
+2016-04-18  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-fs-bb48: New directory for FS-BB48.
+
+	* clk_gpio_init-kl.c: New.
+	* clk_gpio_init-stm32.c: Rename from clk_gpio_init.c.
+
+2016-04-07  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-fsm-55/sys.c: Update for non-SVC Chopstx.
+
+2016-04-07  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/usb-cdc.c: Update.
+
+	* example-cdc/usb_stm32f103.c (usb_handle_transfer): Don't use
+	weak symbols for callbacks, but use explicit callbacks of
+	usb_cb_tx_done and usb_cb_rx_ready.
+
+	* example-cdc/usb_lld.h (usb_cb_tx_done, usb_cb_rx_ready): New
+	callbacks.
+
+2016-04-07  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (chx_cpu_sched_lock, chx_cpu_sched_unlock): Use SVC
+	for Cortex-M3, because of ICI/IT of ESPR.
+	(chx_sched): Invoke svc for Cortex-M3.
+	(preempt, svc): Change back for Cortex-M3.
+
+2016-04-07  Niibe Yutaka  <gniibe@fsij.org>
+
+	* entry.c (vector_table): Since IDLE thread runs with PSP now, use
+	different value for MSP.
+
+	* chopstx.c (chx_sched): Push LR value to PC slot on stack, so
+	that it returns directly to caller.
+
+2016-04-06  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (struct chx_pq): New struct for priority queue.
+	(struct chx_px): New struct for proxy.
+	(struct chx_thread): New member FLAG_IS_PROXY.
+	(ll_dequeue, ll_insert, ll_pop, ll_prio_push, ll_prio_enqueue)
+	Change API.
+	(THREAD_WAIT_POLL): New thread status.
+	(chx_ready_pop, chx_ready_push, chx_ready_enqueue): Type coercion.
+	(chx_timer_insert, chx_timer_dequeue, chx_timer_expired): Use
+	chx_pq.
+	(chx_handle_intr, chopstx_cancel): Handle THREAD_WAIT_POLL.
+	(chx_init): Type coercion.
+	(chx_exit): Handle proxy for join.
+	(chopstx_create): Initialize the member FLAG_IS_PROXY.
+	(chopstx_cond_signal) Handle proxy.
+	(chx_proxy_init, chopstx_poll): New.
+
+2016-04-06  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.h (struct chx_qh): New struct.
+
+	* chopstx.c (struct chx_queue): Use chx_qh.
+	(struct chx_thread): New member PARENT.
+	(ll_empty): Use chx_qh.
+	(ll_prio_push, ll_prio_enqueue): Set the member PARENT.
+	(chx_ready_pop, chx_ready_push, chx_ready_enqueue): Use the
+	member Q.
+	(chx_timer_insert): Return TP.
+	(chx_timer_dequeue, chx_timer_expired): Use the member Q.
+	(chx_init): Initialize change for Q_READY, Q_TIMER, Q_JOIN.
+	(chx_sched, preempt): Handle return value of chx_timer_insert.
+	(chx_exit, chopstx_mutex_init, chopstx_cond_init): Use the member Q.
+	(chx_mutex_unlock): Type coercion to CHX_THREAD.
+	(chopstx_create): Initialize PARENT field.
+	(chopstx_mutex_lock): Use the PARENT field.
+	(chopstx_join): Use ll_prio_enqueue, instead of ll_insert.
+	(chopstx_wakeup_usec_wait): Set REG_R0 on the stack.
+
+2016-04-06  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (struct chx_thread): Move tcontext field.
+	(chx_cpu_sched_lock, chx_cpu_sched_unlock): Use CPSID/CPSIE.
+	(chx_sched): Don't use SVC.  Return integer value.
+	(chopstx_usec_wait_var): Don't use R8.
+	(preempt): Modify so that we don't use SVC.
+
+2016-04-05  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.c (struct NVIC): Add volatile qualifier to members.
+	(chx_spin_init): New.
+	(chopstx_mutex_init, chopstx_cond_init): Call chx_spin_init.
+	(chx_init): Initialize the spinlocks for INTR_LOCK, Q_READY,
+	Q_TIMER, and Q_JOIN.
+
+2016-03-08  Niibe Yutaka  <gniibe@fsij.org>
+
+	* chopstx.h (CHOPSTX_THREAD_SIZE): Align by 8.
+	* chopstx.c (struct chx_thread): Add W field to align.  This is to
+	comply AAPCS (ARM Architecture Procedure Call Standard).
+	(chx_init): Initialize W.
+
+	* example-cdc/usb_stm32f103.c, usb_lld.h: Update from Gnuk.
+	* example-cdc/usb-cdc.c: Update.
+
+2015-11-05  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/sample.c: Enhanced to be echo service.
+
 2015-09-15  Niibe Yutaka  <gniibe@fsij.org>

 	* VERSION: 0.10.
@@ -9,7 +589,7 @@

 	* chopstx.c (q_exit): Remove.
 	(chx_init, chx_exit): Remove access to Q_EXIT.
-	(chx_release_irq_thread): Fix removing form the list.
+	(chx_release_irq_thread): Fix removing from the list.

 2015-09-11  Niibe Yutaka  <gniibe@fsij.org>

@@ -79,7 +659,7 @@
 	* example-fsm-55/hacker-emblem.ld: Put vectors on ROM.
 	* example-fsm-55/sys.c: No system services.
 	* entry.c (entry): Can be public.
-	* clk_gpio_init.c [MCU_STM32F0] (clock_init): Don't change CFGR1.
+	* clk_gpio_init.c (clock_init) [MCU_STM32F0]: Don't change CFGR1.

 2015-07-30  Niibe Yutaka  <gniibe@fsij.org>

@@ -109,7 +689,7 @@
 	* example-cdc/sys.c (sys_board_id): New.
 	* example-cdc/sample.ld (.sys.board_id): New.
 	(__flash_start__, __flash_end__): Remove.
-	* entry.c [HAVE_SYS_H] (vector_table): By undefining STM32F10X_MD,
+	* entry.c (vector_table) [HAVE_SYS_H]: By undefining STM32F10X_MD,
 	prepare for high density device even compiled for MD device.

 2015-07-13  Kaz Kojima  <kkojima@rr.iij4u.or.jp>
--- a/127
+++ b/127
@@ -1,6 +1,133 @@
 NEWS - Noteworthy changes


+* Major changes in Chopstx 1.4
+
+  Released 2017-08-11
+
+** New port: Emulation on GNU/Linux 
+Now, user can run Chopstx application on GNU/Linux.  Its USB driver is
+by USBIP.  Its ADC driver is dummy with random(3).
+
+
+* Major changes in Chopstx 1.3
+
+  Released 2017-02-02
+
+** New board support: Blue Pill
+It is contributed by Paul Fertser.
+
+
+* Major changes in Chopstx 1.2
+
+  Released 2016-10-13
+
+** Fix: chopstx_join
+chopstx_join is now cancellation point.
+
+
+* Major changes in Chopstx 1.1
+
+  Released 2016-07-01
+
+** API change: chopstx_poll
+In version 1.0, chopstx_poll has variable arguments.  It found that
+it's challenging for ffi or lower level C implementation, if C
+compiler is new for the specific MCU target.  Another example is that
+a program touches FPU registers for varargs, even if no argument is
+float.  So, we decided to avoid use of varargs in Chopstx.
+
+** API change: chopstx_setpriority
+In version 1.0, chopstx_setpriority does not return value.  It is
+changed to return old value of the priority.
+
+
+* Major changes in Chopstx 1.0
+
+  Released 2016-06-16
+
+** New USB API
+Now, USB driver is included in Chopstx.  So, it should be good one.
+It used to be the code which was derived from interrupt driven API
+with callbacks.  It's changed to event driven API, so that a user can
+do as wish, beyond the restriction of callbacks.
+
+** New board support: FST-01G
+FST-01G is a new revision of original FST-01 with fixed pull-up of
+D+ line.
+
+
+* Major changes in Chopstx 0.12
+
+  Released 2016-05-31
+
+** Provide drivers of SYS, USB and ADC
+Those were only offered as examples, but now, Chopstx provides drivers
+of SYS, USB, and ADC.  Please note that the ADC driver is not for
+general use (it's specific to NeuG to get noise).  To use them, enable
+variables in Makefile, like following.
+------------
+CHIP=stm32f103
+USE_ADC = yes
+USE_USB = yes
+USE_SYS = yes
+DEFS  = -DUSE_SYS3 
+------------
+
+** Removal of chopstx_usec_wait_var chopstx_wakeup_usec_wait
+This API was used when we need to wait something with timeout.
+Now, we have better API with chopstx_poll.  Please use chopstx_poll
+and chopstx_cond_signal.
+
+
+* Major changes in Chopstx 0.11
+
+  Released 2016-05-19
+
+** New feature: polling
+New function chopstx_poll is added to watch multiple condition
+variables, threads' exit, or IRQ, simultaneously with timeout.
+
+** Change API of eventflag
+The initialization function eventflag_init only has an argument of EV.
+An eventflag can be waited with timeout or can be waited with no
+timeout, as caller like.  It is not determined at initialization time
+now.  Besides, the eventflag can be waited by any threads.  Functions
+to poll eventflag together with other events (cond, join, and IRQ) are
+provided.
+
+** Removal of the function chopstx_release_irq
+IRQ is enabled only when a thread is blocked in polling.  When it (the
+thread in polling) is canceled, IRQ is disabled.
+
+** Removal of the function chopstx_main_init
+It is removed because it's too special.  Please use
+chopstx_setpriority instead.
+
+** New function: chopstx_setpriority
+This function is not recommended in general.  It is only added to
+support the usage when main thread wants to change the schedule
+priority after creating other threads.
+
+** Function chopstx_intr_wait is deprecated
+Use of chopstx_poll is recommended.
+
+** FS-BB48: Kinetis L MCU
+Support for FS-BB48 board with Kinetis L MCU is added.
+
+** No HardFault at context switch on Cortex-M0
+By its design, Chopstx does context switch holding the scheduler lock.
+This is implemented with the feature of BASEPRI on Cortex-M3.  Because
+Cortex-M0 doesn't have support of BASEPRI, the context switch (before
+version 0.11) always caused HardFault exception.  Since Cortex-M0
+doesn't have complex exception mechism of ICI/IT (which is supported
+on Cortex-M3), it is actually possible to implement the context switch
+in user mode.  This is done.
+
+** New sys.c (3.0)
+Don't touch NVIC in usb_lld_sys_init.
+
+
 * Major changes in Chopstx 0.10

  Released 2015-09-15
--- a/17
+++ b/17
@@ -1,14 +1,15 @@
 Chopstx - Threads and only Threads
-							Version 0.10
-							  2015-09-15
+							 Version 1.4
+							  2017-08-11
 							Niibe Yutaka
 					     Flying Stone Technology

 What's Chopstx?
 ===============

-Chopstx is an RT thread library for STM32F103 (ARM Cortex-M3)
-or STM32F0 (ARM Cortex-M0).
+Chopstx is an RT thread library for STM32F103 (ARM Cortex-M3),
+STM32F030 (ARM Cortex-M0), MKL27Z (ARM Cortex-M0plus), and
+emulation on GNU/Linux.

 While most RTOSes come with many features, drivers, and stacks,
 Chopstx just offers a simple RT thread library.
@@ -45,7 +46,11 @@ For STM32 Primer2, see the directory: example-primer2.
 Future Works
 ============

-Convenience function to determine bottom of thread stack, thread local
-storage and support of interface like poll/select would be next thing
+Convenience function to determine the bottom of thread stack,
+configuration of thread size by comiler's output would be next things
 to be done.
+
+Experimental SMP port for Cortex-A7 is under development.  For SMP,
+more careful considerations for shared access to objects of struct
+chx_pq is needed.  So, modifications required will not be small.
 -- 
--- a/2
+++ b/2
@@ -1 +1 @@
-release/0.10
+release/1.4
--- a/adc.h
+++ b/adc.h
@@ -0,0 +1,8 @@
+int adc_init (void);
+void adc_start (void);
+void adc_stop (void);
+
+extern uint32_t adc_buf[64];
+
+void adc_start_conversion (int offset, int count);
+int adc_wait_completion (void);
--- a/board/board-blue-pill.h
+++ b/board/board-blue-pill.h
@@ -0,0 +1,36 @@
+#define BOARD_NAME "Blue Pill"
+/* http://wiki.stm32duino.com/index.php?title=Blue_Pill */
+/* echo -n "Blue Pill" | shasum -a 256 | sed -e 's/^.*\(........\)  -$/\1/' */
+#define BOARD_ID    0xa1099d43
+
+#define STM32F10X_MD		/* Medium-density device */
+
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              9
+#define STM32_HSECLK                    8000000
+
+#define GPIO_LED_BASE   GPIOC_BASE
+#define GPIO_LED_CLEAR_TO_EMIT          13
+#define GPIO_USB_BASE   GPIOA_BASE
+#define GPIO_USB_SET_TO_ENABLE          12
+#undef  GPIO_OTHER_BASE
+
+/*
+ * Port A setup.
+ * PA11 - Push Pull output 10MHz 0 default (until USB enabled) (USBDM)
+ * PA12 - Push Pull output 10MHz 0 default (until USB enabled) (USBDP)
+ * PC13 - Push pull output 50MHz (LED 1:ON 0:OFF)
+ * ------------------------ Default
+ * PAx  - input with pull-up
+ * PCx  - input with pull-up
+ */
+#define VAL_GPIO_USB_ODR            0xFFFFE7FF
+#define VAL_GPIO_USB_CRL            0x88888888      /*  PA7...PA0 */
+#define VAL_GPIO_USB_CRH            0x88811888      /* PA15...PA8 */
+
+#define VAL_GPIO_LED_ODR            0xFFFFFFFF
+#define VAL_GPIO_LED_CRL            0x88888888      /*  PC7...PC0 */
+#define VAL_GPIO_LED_CRH            0x88388888      /* PC15...PC8 */
+
+#define RCC_ENR_IOP_EN      (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPCEN)
+#define RCC_RSTR_IOP_RST    (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPCRST)
--- a/board/board-fs-bb48.h
+++ b/board/board-fs-bb48.h
@@ -0,0 +1,5 @@
+#define BOARD_NAME "FS-BB48"
+#define BOARD_ID    0xd1f5119c
+/* echo -n "FST-01" | sha256sum | sed -e 's/^.*\(........\)  -$/\1/' */
+
+#define MCU_KINETIS_L      1
--- a/board/board-fst-01g.h
+++ b/board/board-fst-01g.h
@@ -0,0 +1,84 @@
+#define BOARD_NAME "FST-01G"
+#define BOARD_ID    0x8801277f
+/* echo -n "FST-01G" | sha256sum | sed -e 's/^.*\(........\)  -$/\1/' */
+
+#define STM32F10X_MD		/* Medium-density device */
+
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              6
+#define STM32_HSECLK                    12000000
+
+#define GPIO_LED_BASE   GPIOB_BASE
+#define GPIO_LED_SET_TO_EMIT            0
+#define GPIO_USB_BASE   GPIOA_BASE
+#undef  GPIO_OTHER_BASE
+
+/*
+ * Port A setup.
+ * PA0  - input with pull-up (TIM2_CH1): AN0 for NeuG
+ * PA1  - input with pull-down (TIM2_CH2)
+ * PA2  - input with pull-up (TIM2_CH3) connected to CIR module
+ * PA3  - input with pull-up: external pin available to user
+ * PA4  - Push pull output           (SPI1_NSS)
+ * PA5  - Alternate Push pull output (SPI1_SCK)
+ * PA6  - Alternate Push pull output (SPI1_MISO)
+ * PA7  - Alternate Push pull output (SPI1_MOSI)
+ * PA10 - Push pull output 1 default
+ *        (so that binary for FST-01G also works on FST-01)
+ * PA11 - Push Pull output 10MHz 0 default (until USB enabled) (USBDM)
+ * PA12 - Push Pull output 10MHz 0 default (until USB enabled) (USBDP)
+ * ------------------------ Default
+ * PA8  - input with pull-up.
+ * PA9  - input with pull-up.
+ * PA13 - input with pull-up.
+ * PA14 - input with pull-up.
+ * PA15 - input with pull-up.
+ */
+#define VAL_GPIO_USB_ODR            0xFFFFE7FD
+#define VAL_GPIO_USB_CRL            0xBBB38888      /*  PA7...PA0 */
+#define VAL_GPIO_USB_CRH            0x88811388      /* PA15...PA8 */
+
+/*
+ * Port B setup.
+ * PB0  - Push pull output   (LED 1:ON 0:OFF)
+ * PB1  - input with pull-up: AN9 for NeuG
+ * ------------------------ Default
+ * PBx  - input with pull-up.
+ */
+#define VAL_GPIO_LED_ODR            0xFFFFFFFF
+#define VAL_GPIO_LED_CRL            0x88888883      /*  PA7...PA0 */
+#define VAL_GPIO_LED_CRH            0x88888888      /* PA15...PA8 */
+
+#define RCC_ENR_IOP_EN      (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN)
+#define RCC_RSTR_IOP_RST    (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST)
+
+/*
+ * Board specific information other than clock and GPIO initial
+ * setting should not be in board-*.h, but each driver should include
+ * information by itself.
+ *
+ * Please see NeuG's ADC driver how board specific handling is done.
+ *
+ * Given the situation of Chopstx's boards support, which is not that
+ * huge, this works well.  If scalability and flexibility will matter,
+ * we will need something like device tree in which boot process can
+ * pass information to application program.
+ *
+ * Following constants are here, because experimental CIR driver is
+ * written before this design decision of Chopstx.
+ *
+ * Those will be removed soon, once such an driver will be improved
+ * in new style.
+ */
+/* For pin-cir settings of Gnuk */
+#define TIMx                  TIM2
+#define INTR_REQ_TIM          TIM2_IRQ
+#define AFIO_EXTICR_INDEX     0
+#define AFIO_EXTICR1_EXTIx_Py AFIO_EXTICR1_EXTI2_PA
+#define EXTI_PR               EXTI_PR_PR2
+#define EXTI_IMR              EXTI_IMR_MR2
+#define EXTI_FTSR_TR          EXTI_FTSR_TR2
+#define INTR_REQ_EXTI         EXTI2_IRQ
+#define ENABLE_RCC_APB1
+#define RCC_APBnENR_TIMxEN    RCC_APB1ENR_TIM2EN
+#define RCC_APBnRSTR_TIMxRST  RCC_APB1RSTR_TIM2RST
--- a/board/board-gnu-linux.h
+++ b/board/board-gnu-linux.h
@@ -0,0 +1,4 @@
+#define BOARD_NAME "GNU/Linux"
+/* Emulation on GNU/Linux */
+/* echo -n "GNU/Linux" | shasum -a 256 | sed -e 's/^.*\(........\)  -$/\1/' */
+#define BOARD_ID    0x7ec86145
--- a/board/board-nitrokey-start.h
+++ b/board/board-nitrokey-start.h
@@ -22,7 +22,7 @@
 * PA4 - floating input
 * PA5 - floating input
 * PA6 - floating input
- * PA7 - Push pull output   (LED1 1:ON 0:OFF)
+ * PA7 - Push pull output   (Red LED1 1:ON 0:OFF)
 * PA8 - floating input (smartcard, SCDSA)
 * PA9 - floating input
 * PA10 - floating input
@@ -37,13 +37,13 @@
 * PA14 - input with pull-up.
 * PA15 - Push pull output   (USB 1:ON 0:OFF)
 */
-#define VAL_GPIO_USB_ODR            0xFFFFE7FF
+#define VAL_GPIO_USB_ODR            0xFFFFE77F
 #define VAL_GPIO_USB_CRL            0x34444488      /*  PA7...PA0 */
 #define VAL_GPIO_USB_CRH            0x38811444      /* PA15...PA8 */

 /*
 * Port B setup.
- * PB0  - Push pull output   (LED2 1:ON 0:OFF)
+ * PB0  - Push pull output   (Green LED2 1:ON 0:OFF)
 * ------------------------ Default
 * PBx  - input with pull-up.
 */
--- a/board/board-stm32f0-discovery.h
+++ b/board/board-stm32f0-discovery.h
@@ -1,6 +1,8 @@
 #define BOARD_NAME "STM32F0 Discovery"
 #define BOARD_ID    0xde4b4bc1

+#define MCU_STM32F0 1
+
 /*
 * Running at 48MHz with HSI as clock source.
 * 
--- a/chopstx-cortex-m.c
+++ b/chopstx-cortex-m.c
@@ -0,0 +1,707 @@
+/*
+ * chopstx-cortex-m.c - Threads and only threads: Arch specific code
+ *                      for Cortex-M0/M3
+ *
+ * Copyright (C) 2013, 2014, 2015, 2016, 2017
+ *               Flying Stone Technology
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+/* Saved registers on the stack.  */
+struct chx_stack_regs {
+  uint32_t reg[8];	       /* r0, r1, r2, r3, r12, lr, pc, xpsr */
+};
+
+/*
+ * Constants for ARM.
+ */
+#define REG_SP 8
+
+#define REG_R0   0
+#define REG_LR   5
+#define REG_PC   6
+#define REG_XPSR 7
+
+#define INITIAL_XPSR 0x01000000	/* T=1 */
+
+/*
+ * Exception priority: lower has higher precedence.
+ *
+ * Cortex-M3
+ * =====================================
+ * Prio 0x30: svc
+ * ---------------------
+ * Prio 0x40: thread temporarily inhibiting schedule for critical region
+ * ...
+ * Prio 0xb0: systick, external interrupt
+ * Prio 0xc0: pendsv
+ * =====================================
+ *
+ * Cortex-M0
+ * =====================================
+ * Prio 0x00: thread temporarily inhibiting schedule for critical region
+ * ...
+ * Prio 0x40: systick, external interrupt
+ * Prio 0x80: pendsv
+ * Prio 0x80: svc
+ * =====================================
+ */
+
+#define CPU_EXCEPTION_PRIORITY_CLEAR         0
+
+#if defined(__ARM_ARCH_6M__)
+#define CPU_EXCEPTION_PRIORITY_INHIBIT_SCHED 0x00
+/* ... */
+#define CPU_EXCEPTION_PRIORITY_SYSTICK       CPU_EXCEPTION_PRIORITY_INTERRUPT
+#define CPU_EXCEPTION_PRIORITY_INTERRUPT     0x40
+#define CPU_EXCEPTION_PRIORITY_PENDSV        0x80
+#define CPU_EXCEPTION_PRIORITY_SVC           0x80 /* No use in this arch */
+#elif defined(__ARM_ARCH_7M__)
+#define CPU_EXCEPTION_PRIORITY_SVC           0x30
+
+#define CPU_EXCEPTION_PRIORITY_INHIBIT_SCHED 0x40
+/* ... */
+#define CPU_EXCEPTION_PRIORITY_SYSTICK       CPU_EXCEPTION_PRIORITY_INTERRUPT
+#define CPU_EXCEPTION_PRIORITY_INTERRUPT     0xb0
+#define CPU_EXCEPTION_PRIORITY_PENDSV        0xc0
+#else
+#error "no support for this arch"
+#endif
+
+/*
+ * Lower layer architecture specific functions.
+ *
+ * system tick and interrupt
+ */
+
+/*
+ * System tick
+ */
+/* SysTick registers.  */
+static volatile uint32_t *const SYST_CSR = (uint32_t *)0xE000E010;
+static volatile uint32_t *const SYST_RVR = (uint32_t *)0xE000E014;
+static volatile uint32_t *const SYST_CVR = (uint32_t *)0xE000E018;
+
+static void
+chx_systick_reset (void)
+{
+  *SYST_RVR = 0;
+  *SYST_CVR = 0;
+  *SYST_CSR = 7;
+}
+
+static void
+chx_systick_reload (uint32_t ticks)
+{
+  *SYST_RVR = ticks;
+  *SYST_CVR = 0;  /* write (any) to clear the counter to reload.  */
+  *SYST_RVR = 0;
+}
+
+static uint32_t
+chx_systick_get (void)
+{
+  return *SYST_CVR;
+}
+
+static uint32_t usec_to_ticks (uint32_t usec)
+{
+  return usec * MHZ;
+}
+
+/*
+ * Interrupt Handling
+ */
+
+/* NVIC: Nested Vectored Interrupt Controller.  */
+struct NVIC {
+  volatile uint32_t ISER[8];
+  uint32_t unused1[24];
+  volatile uint32_t ICER[8];
+  uint32_t unused2[24];
+  volatile uint32_t ISPR[8];
+  uint32_t unused3[24];
+  volatile uint32_t ICPR[8];
+  uint32_t unused4[24];
+  volatile uint32_t IABR[8];
+  uint32_t unused5[56];
+  volatile uint32_t IPR[60];
+};
+
+static struct NVIC *const NVIC = (struct NVIC *)0xE000E100;
+#define NVIC_ISER(n)	(NVIC->ISER[n >> 5])
+#define NVIC_ICER(n)	(NVIC->ICER[n >> 5])
+#define NVIC_ICPR(n)	(NVIC->ICPR[n >> 5])
+#define NVIC_IPR(n)	(NVIC->IPR[n >> 2])
+
+
+static void
+chx_enable_intr (uint8_t irq_num)
+{
+  NVIC_ISER (irq_num) = 1 << (irq_num & 0x1f);
+}
+
+static void
+chx_clr_intr (uint8_t irq_num)
+{				/* Clear pending interrupt.  */
+  NVIC_ICPR (irq_num) = 1 << (irq_num & 0x1f);
+}
+
+static void
+chx_disable_intr (uint8_t irq_num)
+{
+  NVIC_ICER (irq_num) = 1 << (irq_num & 0x1f);
+}
+
+static void
+chx_set_intr_prio (uint8_t n)
+{
+  unsigned int sh = (n & 3) << 3;
+
+  NVIC_IPR (n) = (NVIC_IPR(n) & ~(0xFF << sh))
+    | (CPU_EXCEPTION_PRIORITY_INTERRUPT << sh);
+}
+
+static volatile uint32_t *const ICSR = (uint32_t *)0xE000ED04;
+
+/* Priority control.  */
+static uint32_t *const AIRCR = (uint32_t *)0xE000ED0C;
+static uint32_t *const SHPR2 = (uint32_t *)0xE000ED1C;
+static uint32_t *const SHPR3 = (uint32_t *)0xE000ED20;
+
+static void
+chx_prio_init (void)
+{
+  *AIRCR = 0x05FA0000 | ( 5 << 8); /* PRIGROUP = 5, 2-bit:2-bit. */
+  *SHPR2 = (CPU_EXCEPTION_PRIORITY_SVC << 24);
+  *SHPR3 = ((CPU_EXCEPTION_PRIORITY_SYSTICK << 24)
+	    | (CPU_EXCEPTION_PRIORITY_PENDSV << 16));
+}
+
+
+static void
+chx_cpu_sched_lock (void)
+{
+  if (running->prio < CHOPSTX_PRIO_INHIBIT_PREEMPTION)
+    {
+#if defined(__ARM_ARCH_6M__)
+      asm volatile ("cpsid	i" : : : "memory");
+#else
+      register uint32_t tmp = CPU_EXCEPTION_PRIORITY_INHIBIT_SCHED;
+      asm volatile ("msr	BASEPRI, %0" : : "r" (tmp) : "memory");
+#endif
+    }
+}
+
+static void
+chx_cpu_sched_unlock (void)
+{
+  if (running->prio < CHOPSTX_PRIO_INHIBIT_PREEMPTION)
+    {
+#if defined(__ARM_ARCH_6M__)
+      asm volatile ("cpsie	i" : : : "memory");
+#else
+      register uint32_t tmp = CPU_EXCEPTION_PRIORITY_CLEAR;
+      asm volatile ("msr	BASEPRI, %0" : : "r" (tmp) : "memory");
+#endif
+    }
+}
+
+
+static void __attribute__((naked, used))
+idle (void)
+{
+#if defined(USE_WFI_FOR_IDLE)
+  for (;;)
+    asm volatile ("wfi" : : : "memory");
+#else
+  for (;;);
+#endif
+}
+
+
+void
+chx_handle_intr (void)
+{
+  struct chx_pq *p;
+  register uint32_t irq_num;
+
+  asm volatile ("mrs	%0, IPSR\n\t"
+		"sub	%0, #16"   /* Exception # - 16 = interrupt number.  */
+		: "=r" (irq_num) : /* no input */ : "memory");
+
+  chx_disable_intr (irq_num);
+  chx_spin_lock (&q_intr.lock);
+  for (p = q_intr.q.next; p != (struct chx_pq *)&q_intr.q; p = p->next)
+    if (p->v == irq_num)
+      {			/* should be one at most. */
+	struct chx_px *px = (struct chx_px *)p;
+
+	ll_dequeue (p);
+	chx_wakeup (p);
+	chx_request_preemption (px->master->prio);
+	break;
+      }
+  chx_spin_unlock (&q_intr.lock);
+}
+
+static void
+chx_init_arch (struct chx_thread *tp)
+{
+  memset (&tp->tc, 0, sizeof (tp->tc));
+}
+
+static void
+chx_request_preemption (uint16_t prio)
+{
+  if (running == NULL || (uint16_t)running->prio < prio)
+    {
+      *ICSR = (1 << 28);
+      asm volatile ("" : : : "memory");
+    }
+}
+
+
+/*
+ * chx_sched: switch to another thread.
+ *
+ * There are two cases:
+ *   YIELD=0 (SLEEP): Current RUNNING thread is already connected to
+ *                    something (mutex, cond, intr, etc.)
+ *   YIELD=1 (YIELD): Current RUNNING thread is active,
+ *                    it is needed to be enqueued to READY queue.
+ *
+ * For Cortex-M0, this should be AAPCS-compliant function entry, so we
+ * put "noinline" attribute.
+ *
+ * 	AAPCS: ARM Architecture Procedure Call Standard
+ *
+ * Returns:
+ *          1 on wakeup by others.
+ *          0 on normal wakeup.
+ *         -1 on cancellation.
+ */
+static uintptr_t __attribute__ ((naked, noinline))
+chx_sched (uint32_t yield)
+{
+  register struct chx_thread *tp asm ("r0");
+
+#if defined(__ARM_ARCH_7M__)
+  asm volatile (
+	"svc	#0\n\t"
+	"bx	lr"
+	: "=r" (tp) : "0" (yield): "memory");
+#else
+  register uint32_t arg_yield asm ("r1");
+
+  /* Build stack data as if it were an exception entry.  */
+  /*
+   * r0:  0                     scratch
+   * r1:  0                     scratch
+   * r2:  0                     scratch
+   * r3:  0                     scratch
+   * r12: 0                     scratch
+   * lr   as-is
+   * pc:  return address (= lr)
+   * psr: INITIAL_XPSR          scratch
+   */
+  asm ("mov	r1, lr\n\t"
+       "mov	r2, r1\n\t"
+       "mov	r3, #128\n\t"
+       "lsl	r3, #17\n\t"
+       "push	{r1, r2, r3}\n\t"
+       "mov	r1, #0\n\t"
+       "mov	r2, r1\n\t"
+       "mov	r3, r1\n\t"
+       "push	{r1, r2, r3}\n\t"
+       "push	{r1, r2}"
+       : /* no output*/
+       : /* no input */
+       : "r1", "r2", "r3", "memory");
+
+  /* Save registers onto CHX_THREAD struct.  */
+  asm ("mov	r1, r0\n\t"
+       "ldr	r2, =running\n\t"
+       "ldr	r0, [r2]\n\t"
+       "add	r0, #20\n\t"
+       "stm	r0!, {r4, r5, r6, r7}\n\t"
+       "mov	r2, r8\n\t"
+       "mov	r3, r9\n\t"
+       "mov	r4, r10\n\t"
+       "mov	r5, r11\n\t"
+       "mov	r6, sp\n\t"
+       "stm	r0!, {r2, r3, r4, r5, r6}\n\t"
+       "sub	r0, #56"
+       : "=r" (tp), "=r" (arg_yield)
+       : "0" (yield)
+       : "r2", "r3", "r4", "r5", "r6", "r7", "memory");
+
+  if (arg_yield)
+    {
+      if (tp->flag_sched_rr)
+	chx_timer_dequeue (tp);
+      chx_ready_enqueue (tp);
+    }
+
+  tp = chx_ready_pop ();
+  if (tp && tp->flag_sched_rr)
+    {
+      chx_spin_lock (&q_timer.lock);
+      tp = chx_timer_insert (tp, PREEMPTION_USEC);
+      chx_spin_unlock (&q_timer.lock);
+    }
+
+  asm volatile (/* Now, r0 points to the thread to be switched.  */
+		/* Put it to *running.  */
+		"ldr	r1, =running\n\t"
+		/* Update running.  */
+		"str	r0, [r1]\n\t"
+		"cmp	r0, #0\n\t"
+		"bne	0f\n\t"
+
+		/* Spawn an IDLE thread.  */
+		"ldr	r1, =__main_stack_end__\n\t"
+		"mov	sp, r1\n\t"
+		"ldr	r0, =idle\n\t"	     /* PC = idle */
+		/**/
+		/* Unmask interrupts.  */
+		"cpsie	i\n\t"
+		"bx	r0\n"
+
+		/* Normal context switch */
+	"0:\n\t"
+		"add	r0, #16\n\t" /* ->V */
+		"ldr	r1, [r0]\n\t"
+		"str	r1, [sp]\n\t"
+		/**/
+		"add	r0, #4\n\t"
+		"ldm	r0!, {r4, r5, r6, r7}\n\t"
+		"ldm	r0!, {r1, r2, r3}\n\t"
+		"mov	r8, r1\n\t"
+		"mov	r9, r2\n\t"
+		"mov	r10, r3\n\t"
+		"ldm	r0!, {r1, r2}\n\t"
+		"mov	r11, r1\n\t"
+		"mov	sp, r2\n\t"
+		"sub	r0, #45\n\t"
+		"ldrb	r1, [r0]\n\t" /* ->PRIO field.  */
+		"cmp	r1, #247\n\t"
+		"bhi	1f\n\t"	/* Leave interrupt disabled if >= 248 */
+		/**/
+		/* Unmask interrupts.  */
+		"cpsie	i\n"
+		/**/
+	"1:\n\t"
+		/*
+		  0:  r0
+		  4:  r1
+		  8:  r2
+		  12: r3
+		  16: r12
+		  20: lr
+		  24: pc
+		  28: psr
+		  32: possibly exists for alignment
+		  [28 or 32] <-- pc
+		*/
+		"ldr	r0, [sp, #28]\n\t"
+		"lsl	r1, r0, #23\n\t"
+		"bcc	2f\n\t"
+		/**/
+		"ldr	r2, [sp, #24]\n\t"
+		"mov	r1, #1\n\t"
+		"orr	r2, r1\n\t"	/* Ensure Thumb-mode */
+		"str	r2, [sp, #32]\n\t"
+		"msr	APSR_nzcvq, r0\n\t"
+		/**/
+		"ldr	r0, [sp, #20]\n\t"
+		"mov	lr, r0\n\t"
+		"ldr	r0, [sp, #16]\n\t"
+		"mov	r12, r0\n\t"
+		"pop	{r0, r1, r2, r3}\n\t"
+		"add	sp, #16\n\t"
+		"pop	{pc}\n"
+	"2:\n\t"
+		"ldr	r2, [sp, #24]\n\t"
+		"mov	r1, #1\n\t"
+		"orr	r2, r1\n\t"	/* Ensure Thumb-mode */
+		"str	r2, [sp, #28]\n\t"
+		"msr	APSR_nzcvq, r0\n\t"
+		/**/
+		"ldr	r0, [sp, #20]\n\t"
+		"mov	lr, r0\n\t"
+		"ldr	r0, [sp, #16]\n\t"
+		"mov	r12, r0\n\t"
+		"pop	{r0, r1, r2, r3}\n\t"
+		"add	sp, #12\n\t"
+		"pop	{pc}"
+		: "=r" (tp)		/* Return value in R0 */
+		: "0" (tp)
+		: "memory");
+#endif
+
+  return (uintptr_t)tp;
+}
+
+extern void cause_link_time_error_unexpected_size_of_struct_chx_thread (void);
+
+static struct chx_thread *
+chopstx_create_arch (uintptr_t stack_addr, size_t stack_size,
+		     voidfunc thread_entry, void *arg)
+{
+  struct chx_thread *tp;
+  void *stack;
+  struct chx_stack_regs *p;
+
+  if (CHOPSTX_THREAD_SIZE != sizeof(struct chx_thread))
+    cause_link_time_error_unexpected_size_of_struct_chx_thread ();
+
+  if (stack_size < sizeof (struct chx_thread) + 8 * sizeof (uint32_t))
+    chx_fatal (CHOPSTX_ERR_THREAD_CREATE);
+
+  stack = (void *)(stack_addr + stack_size - sizeof (struct chx_thread)
+		   - sizeof (struct chx_stack_regs));
+  memset (stack, 0, sizeof (struct chx_stack_regs));
+  tp = (struct chx_thread *)(stack + sizeof (struct chx_stack_regs));
+  p = (struct chx_stack_regs *)stack;
+  p->reg[REG_R0] = (uint32_t)arg;
+  p->reg[REG_LR] = (uint32_t)chopstx_exit;
+  p->reg[REG_PC] = (uint32_t)thread_entry;
+  p->reg[REG_XPSR] = INITIAL_XPSR;
+
+  memset (&tp->tc, 0, sizeof (tp->tc));
+  tp->tc.reg[REG_SP] = (uint32_t)stack;
+
+  return tp;
+}
+
+/*
+ * Lower layer architecture specific exception handling entries.
+ *
+ */
+
+void __attribute__ ((naked))
+preempt (void)
+{
+  register struct chx_thread *tp asm ("r0");
+  register struct chx_thread *cur asm ("r1");
+
+  asm volatile (
+#if defined(__ARM_ARCH_6M__)
+	"cpsid	i\n\t"
+#else
+	"msr	BASEPRI, r0\n\t"
+#endif
+	"ldr	r2, =running\n\t"
+	"ldr	r0, [r2]\n\t"
+	"mov	r1, r0"
+	: "=r" (tp), "=r" (cur)
+	: "0" (CPU_EXCEPTION_PRIORITY_INHIBIT_SCHED)
+	: "r2");
+
+  if (!cur)
+    /* It's idle thread.  It's ok to clobber registers.  */
+    ;
+  else
+    {
+      /* Save registers onto CHX_THREAD struct.  */
+      asm volatile (
+	"add	%0, #20\n\t"
+	"stm	%0!, {r4, r5, r6, r7}\n\t"
+	"mov	r2, r8\n\t"
+	"mov	r3, r9\n\t"
+	"mov	r4, r10\n\t"
+	"mov	r5, r11\n\t"
+	"mrs	r6, PSP\n\t" /* r13(=SP) in user space.  */
+	"stm	%0!, {r2, r3, r4, r5, r6}"
+	: "=r" (cur)
+	: "0" (cur)
+          /*
+	   * Memory clobber constraint here is not accurate, but this
+	   * works.  R7 keeps its value, but having "r7" here prevents
+	   * use of R7 before this asm statement.
+	   */
+	: "r2", "r3", "r4", "r5", "r6", "r7", "memory");
+
+      if (tp)
+	{
+	  if (tp->flag_sched_rr)
+	    {
+	      if (tp->state == THREAD_RUNNING)
+		{
+		  chx_timer_dequeue (tp);
+		  chx_ready_enqueue (tp);
+		}
+	      /*
+	       * It may be THREAD_READY after chx_timer_expired.
+	       * Then, do nothing.
+	       */
+	    }
+	  else
+	    chx_ready_push (tp);
+	  running = NULL;
+	}
+    }
+
+  /* Registers on stack (PSP): r0, r1, r2, r3, r12, lr, pc, xpsr */
+
+  tp = chx_ready_pop ();
+  if (tp && tp->flag_sched_rr)
+    {
+      chx_spin_lock (&q_timer.lock);
+      tp = chx_timer_insert (tp, PREEMPTION_USEC);
+      chx_spin_unlock (&q_timer.lock);
+    }
+
+  asm volatile (
+    ".L_CONTEXT_SWITCH:\n\t"
+	/* Now, r0 points to the thread to be switched.  */
+	/* Put it to *running.  */
+	"ldr	r1, =running\n\t"
+	/* Update running.  */
+	"str	r0, [r1]\n\t"
+#if defined(__ARM_ARCH_6M__)
+	"cmp	r0, #0\n\t"
+	"beq	1f\n\t"
+#else
+	"cbz	r0, 1f\n\t"
+#endif
+	/**/
+	"add	r0, #20\n\t"
+	"ldm	r0!, {r4, r5, r6, r7}\n\t"
+#if defined(__ARM_ARCH_6M__)
+	"ldm	r0!, {r1, r2, r3}\n\t"
+	"mov	r8, r1\n\t"
+	"mov	r9, r2\n\t"
+	"mov	r10, r3\n\t"
+	"ldm	r0!, {r1, r2}\n\t"
+	"mov	r11, r1\n\t"
+	"msr	PSP, r2\n\t"
+#else
+	"ldr	r8, [r0], #4\n\t"
+	"ldr	r9, [r0], #4\n\t"
+	"ldr	r10, [r0], #4\n\t"
+	"ldr	r11, [r0], #4\n\t"
+	"ldr	r1, [r0], #4\n\t"
+	"msr	PSP, r1\n\t"
+#endif
+	"sub	r0, #45\n\t"
+	"ldrb	r1, [r0]\n\t" /* ->PRIO field.  */
+	"mov	r0, #0\n\t"
+	"cmp	r1, #247\n\t"
+	"bhi	0f\n\t"	/* Leave interrupt disabled if >= 248 */
+	/**/
+	/* Unmask interrupts.  */
+#if defined(__ARM_ARCH_6M__)
+	"cpsie	i\n"
+#else
+	"msr	BASEPRI, r0\n"
+#endif
+	/**/
+    "0:\n\t"
+	"sub	r0, #3\n\t" /* EXC_RETURN to a thread with PSP */
+	"bx	r0\n"
+    "1:\n\t"
+	/* Spawn an IDLE thread.  */
+	"ldr	r0, =__main_stack_end__-32\n\t"
+	"msr	PSP, r0\n\t"
+	"mov	r1, #0\n\t"
+	"mov	r2, #0\n\t"
+	"mov	r3, #0\n\t"
+	"stm	r0!, {r1, r2, r3}\n\t"
+	"stm	r0!, {r1, r2, r3}\n\t"
+	"ldr	r1, =idle\n\t"	     /* PC = idle */
+	"mov	r2, #0x010\n\t"
+	"lsl	r2, r2, #20\n\t" /* xPSR = T-flag set (Thumb) */
+	"stm	r0!, {r1, r2}\n\t"
+	/**/
+	/* Unmask interrupts.  */
+	"mov	r0, #0\n\t"
+#if defined(__ARM_ARCH_6M__)
+	"cpsie	i\n\t"
+#else
+	"msr	BASEPRI, r0\n"
+#endif
+	/**/
+	"sub	r0, #3\n\t" /* EXC_RETURN to a thread with PSP */
+	"bx	r0"
+	: /* no output */ : "r" (tp) : "memory");
+}
+
+#if defined(__ARM_ARCH_7M__)
+/*
+ * System call: switch to another thread.
+ * There are two cases:
+ *   ORIG_R0=0 (SLEEP): Current RUNNING thread is already connected to
+ *                      something (mutex, cond, intr, etc.)
+ *   ORIG_R0=1 (YIELD): Current RUNNING thread is active,
+ *                      it is needed to be enqueued to READY queue.
+ */
+void __attribute__ ((naked))
+svc (void)
+{
+  register struct chx_thread *tp asm ("r0");
+  register uint32_t orig_r0 asm ("r1");
+
+  asm ("ldr	r1, =running\n\t"
+       "ldr	r0, [r1]\n\t"
+       "add	r1, r0, #20\n\t"
+       /* Save registers onto CHX_THREAD struct.  */
+       "stm	r1!, {r4, r5, r6, r7}\n\t"
+       "mov	r2, r8\n\t"
+       "mov	r3, r9\n\t"
+       "mov	r4, r10\n\t"
+       "mov	r5, r11\n\t"
+       "mrs	r6, PSP\n\t" /* r13(=SP) in user space.  */
+       "stm	r1!, {r2, r3, r4, r5, r6}\n\t"
+       "ldr	r1, [r6]"
+       : "=r" (tp), "=r" (orig_r0)
+       : /* no input */
+       : "r2", "r3", "r4", "r5", "r6", "memory");
+
+  if (orig_r0)			/* yield */
+    {
+      if (tp->flag_sched_rr)
+	chx_timer_dequeue (tp);
+      chx_ready_enqueue (tp);
+      running = NULL;
+    }
+
+  tp = chx_ready_pop ();
+  if (tp && tp->flag_sched_rr)
+    {
+      chx_spin_lock (&q_timer.lock);
+      chx_timer_insert (tp, PREEMPTION_USEC);
+      chx_spin_unlock (&q_timer.lock);
+    }
+
+  asm volatile (
+	"cbz	r0, 0f\n\t"
+	"ldr	r1, [r0, #16]\n\t" /* ->V */
+	"str	r1, [sp]\n\t"
+    "0:\n\t"
+	"b	.L_CONTEXT_SWITCH"
+	: /* no output */ : "r" (tp) : "memory");
+}
+#endif
--- a/chopstx-cortex-m.h
+++ b/chopstx-cortex-m.h
@@ -0,0 +1,12 @@
+/*
+ * The thread context: specific to ARM Cortex-M0/M3.
+ *
+ * In this structure, it's only partial information; Other part of the
+ * context is on the stack.
+ *
+ */
+struct tcontext {
+  uint32_t reg[9];	   /* r4, r5, r6, r7, r8, r9, r10, r11, r13(sp) */
+};
+
+typedef struct tcontext tcontext_t;
--- a/chopstx-gnu-linux.c
+++ b/chopstx-gnu-linux.c
@@ -0,0 +1,344 @@
+/*
+ * chopstx-gnu-linux.c - Threads and only threads: Arch specific code
+ *                       for GNU/Linux emulation
+ *
+ * Copyright (C) 2017 Flying Stone Technology
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <unistd.h>
+#include <ucontext.h>
+#include <signal.h>
+#include <sys/time.h>
+
+static sigset_t ss_cur;
+
+static void
+chx_systick_reset (void)
+{
+  const struct itimerval it = { {0, 0}, {0, 0} };
+
+  setitimer (ITIMER_REAL, &it, 0);
+}
+
+static void
+chx_systick_reload (uint32_t ticks)
+{
+  struct itimerval it;
+
+  it.it_value.tv_sec = 0;
+  it.it_value.tv_usec = (ticks / MHZ);
+  it.it_interval.tv_sec = 0;
+  it.it_interval.tv_usec = 0;
+
+  setitimer (ITIMER_REAL, &it, 0);
+}
+
+static uint32_t
+chx_systick_get (void)
+{
+  struct itimerval it;
+  getitimer (ITIMER_REAL, &it);
+  return it.it_value.tv_usec * 72;
+}
+
+static uint32_t
+usec_to_ticks (uint32_t usec)
+{
+  return usec * MHZ;
+}
+
+
+static void
+chx_enable_intr (uint8_t irq_num)
+{
+  sigdelset (&ss_cur, irq_num);
+}
+
+static void
+chx_clr_intr (uint8_t irq_num)
+{				/* Clear pending interrupt.  */
+  (void)irq_num;
+}
+
+static void
+chx_disable_intr (uint8_t irq_num)
+{
+  sigaddset (&ss_cur, irq_num);
+}
+
+static void
+chx_set_intr_prio (uint8_t n)
+{
+  (void)n;
+}
+
+static void
+chx_prio_init (void)
+{
+}
+
+static void
+chx_cpu_sched_lock (void)
+{
+  sigset_t ss;
+
+  sigfillset (&ss);
+  pthread_sigmask (SIG_BLOCK, &ss, &ss_cur);
+}
+
+static void
+chx_cpu_sched_unlock (void)
+{
+  pthread_sigmask (SIG_SETMASK, &ss_cur, NULL);
+}
+
+static void
+idle (void)
+{
+  for (;;)
+    pause ();
+}
+
+void
+chx_handle_intr (uint32_t irq_num)
+{
+  struct chx_pq *p;
+
+  chx_disable_intr (irq_num);
+  chx_spin_lock (&q_intr.lock);
+  for (p = q_intr.q.next; p != (struct chx_pq *)&q_intr.q; p = p->next)
+    if (p->v == irq_num)
+      {			/* should be one at most. */
+	struct chx_px *px = (struct chx_px *)p;
+
+	ll_dequeue (p);
+	chx_wakeup (p);
+	chx_spin_unlock (&q_intr.lock);
+	chx_request_preemption (px->master->prio);
+	return;
+      }
+  chx_spin_unlock (&q_intr.lock);
+}
+
+
+static ucontext_t idle_tc;
+static char idle_stack[4096];
+
+struct chx_thread main_thread;
+
+void
+chx_sigmask (ucontext_t *uc)
+{
+  /* Modify oldmask to SS_CUR, so that the signal mask will
+   * be set to SS_CUR.
+   *
+   * In user-level, sigset_t is big, but only the first word
+   * is used by the kernel.
+   */
+  memcpy (&uc->uc_sigmask, &ss_cur, sizeof (uint64_t));
+}
+
+static void
+sigalrm_handler (int sig, siginfo_t *siginfo, void *arg)
+{
+  extern void chx_timer_expired (void);
+  ucontext_t *uc = arg;
+  (void)sig;
+  (void)siginfo;
+  chx_timer_expired ();
+  chx_sigmask (uc);
+}
+
+static void
+chx_init_arch (struct chx_thread *tp)
+{
+  struct sigaction sa;
+
+  sigemptyset (&ss_cur);
+
+  sa.sa_sigaction = sigalrm_handler;
+  sigfillset (&sa.sa_mask);
+  sa.sa_flags = SA_SIGINFO|SA_RESTART;
+  sigaction (SIGALRM, &sa, NULL); 
+
+  getcontext (&idle_tc);
+  idle_tc.uc_stack.ss_sp = idle_stack;
+  idle_tc.uc_stack.ss_size = sizeof (idle_stack);
+  idle_tc.uc_link = NULL;
+  makecontext (&idle_tc, idle, 0);
+
+  getcontext (&tp->tc);
+}
+
+static void
+chx_request_preemption (uint16_t prio)
+{
+  struct chx_thread *tp, *tp_prev;
+  ucontext_t *tcp;
+
+  if (running && (uint16_t)running->prio >= prio)
+    return;
+
+  /* Change the context to another thread with higher priority.  */
+  tp = tp_prev = running;
+  if (tp)
+    {
+      if (tp->flag_sched_rr)
+	{
+	  if (tp->state == THREAD_RUNNING)
+	    {
+	      chx_timer_dequeue (tp);
+	      chx_ready_enqueue (tp);
+	    }
+	}
+      else
+	chx_ready_push (tp);
+      running = NULL;
+    }
+
+  tp = running = chx_ready_pop ();
+  if (tp)
+    {
+      tcp = &tp->tc;
+      if (tp->flag_sched_rr)
+	{
+	  chx_spin_lock (&q_timer.lock);
+	  tp = chx_timer_insert (tp, PREEMPTION_USEC);
+	  chx_spin_unlock (&q_timer.lock);
+	}
+    }
+  else
+    tcp = &idle_tc;
+
+  if (tp_prev)
+    {
+      /*
+       * The swapcontext implementation may reset sigmask in the
+       * middle of its execution, unfortunately.  It is best if
+       * sigmask restore is done at the end of the routine, but we
+       * can't assume that.
+       *
+       * Thus, there might be a race condition with regards to the
+       * user context TCP, if signal mask is cleared and signal comes
+       * in.  To avoid this situation, we block signals.
+       *
+       * We don't need to fill the mask here.  It keeps the condition
+       * of blocking signals before&after swapcontext call.  It is
+       * done by the signal mask for sigaction, the initial creation
+       * of the thread, and the condition of chx_sched function which
+       * mandates holding cpu_sched_lock.
+       */
+      swapcontext (&tp_prev->tc, tcp);
+    }
+  else if (tp)
+    {
+      setcontext (tcp);
+    }
+}
+
+/*
+ * chx_sched: switch to another thread.
+ *
+ * There are two cases:
+ *   YIELD=0 (SLEEP): Current RUNNING thread is already connected to
+ *                    something (mutex, cond, intr, etc.)
+ *   YIELD=1 (YIELD): Current RUNNING thread is active,
+ *                    it is needed to be enqueued to READY queue.
+ *
+ * Returns:
+ *          1 on wakeup by others.
+ *          0 on normal wakeup.
+ *         -1 on cancellation.
+ */
+static uintptr_t
+chx_sched (uint32_t yield)
+{
+  struct chx_thread *tp, *tp_prev;
+  uintptr_t v;
+  ucontext_t *tcp;
+
+  tp = tp_prev = running;
+  if (yield)
+    {
+      if (tp->flag_sched_rr)
+	chx_timer_dequeue (tp);
+      chx_ready_enqueue (tp);
+    }
+
+  running = tp = chx_ready_pop ();
+  if (tp)
+    {
+      v = tp->v;
+      if (tp->flag_sched_rr)
+	{
+	  chx_spin_lock (&q_timer.lock);
+	  tp = chx_timer_insert (tp, PREEMPTION_USEC);
+	  chx_spin_unlock (&q_timer.lock);
+	}
+      tcp = &tp->tc;
+    }
+  else
+    {
+      v = 0;
+      tcp = &idle_tc;
+    }
+
+  swapcontext (&tp_prev->tc, tcp);
+  chx_cpu_sched_unlock ();
+  return v;
+}
+
+static void __attribute__((__noreturn__))
+chx_thread_start (voidfunc thread_entry, void *arg)
+{
+  chx_cpu_sched_unlock ();
+  thread_entry (arg);
+  chopstx_exit (0);
+}
+
+static struct chx_thread *
+chopstx_create_arch (uintptr_t stack_addr, size_t stack_size,
+		     voidfunc thread_entry, void *arg)
+{
+  struct chx_thread *tp;
+  tp = malloc (sizeof (struct chx_thread));
+  if (!tp)
+    chx_fatal (CHOPSTX_ERR_THREAD_CREATE);
+
+  /*
+   * Calling getcontext with sched_lock held, the context is with
+   * signal blocked.  The sigmask will be cleared in chx_thread_start.
+   */
+  chx_cpu_sched_lock ();
+  getcontext (&tp->tc);
+  tp->tc.uc_stack.ss_sp = (void *)stack_addr;
+  tp->tc.uc_stack.ss_size = stack_size;
+  tp->tc.uc_link = NULL;
+
+  makecontext (&tp->tc, (void (*)(void))chx_thread_start,
+	       4, thread_entry, arg);
+  chx_cpu_sched_unlock ();
+  return tp;
+}
--- a/chopstx-gnu-linux.h
+++ b/chopstx-gnu-linux.h
@@ -0,0 +1,10 @@
+#include <ucontext.h>
+/*
+ * The thread context: specific to GNU/Linux.
+ *
+ * We use the type ucontext_t, which includes all registers;
+ * Note that signal mask is also included in ucontext_t.
+ *
+ */
+
+typedef ucontext_t tcontext_t;
--- a/chopstx.c
+++ b/chopstx.c
--- a/chopstx.h
+++ b/chopstx.h
@@ -1,7 +1,7 @@
 /*
 * chopstx.h - Threads and only threads.
 *
- * Copyright (C) 2013 Flying Stone Technology
+ * Copyright (C) 2013, 2016 Flying Stone Technology
 * Author: NIIBE Yutaka <gniibe@fsij.org>
 *
 * This file is a part of Chopstx, a thread library for embedded.
@@ -26,17 +26,20 @@
 *
 */

-typedef uint32_t chopstx_t;
+struct chx_qh {
+  struct chx_pq *next, *prev;
+};
+
+typedef uintptr_t chopstx_t;
 typedef uint8_t chopstx_prio_t;

 extern chopstx_t chopstx_main;

-void chopstx_main_init (chopstx_prio_t);

 /* NOTE: This signature is different to PTHREAD's one.  */
 chopstx_t
 chopstx_create (uint32_t flags_and_prio,
-		uint32_t stack_addr, size_t stack_size,
+		uintptr_t stack_addr, size_t stack_size,
 		void *(thread_entry) (void *), void *);
 #define CHOPSTX_PRIO_BITS 8
 #define CHOPSTX_DETACHED 0x10000
@@ -44,8 +47,6 @@ chopstx_create (uint32_t flags_and_prio,

 #define CHOPSTX_PRIO_INHIBIT_PREEMPTION 248

-void chopstx_usec_wait_var (uint32_t *arg);
-
 void chopstx_usec_wait (uint32_t usec);

 struct chx_spinlock {
@@ -53,9 +54,7 @@ struct chx_spinlock {
 };

 typedef struct chx_mtx {
-  struct {
-    struct chx_thread *next, *prev;
-  } q;
+  struct chx_qh q;
  struct chx_spinlock lock;
  struct chx_thread *owner;
  struct chx_mtx *list;
@@ -69,9 +68,7 @@ void chopstx_mutex_lock (chopstx_mutex_t *mutex);
 void chopstx_mutex_unlock (chopstx_mutex_t *mutex);

 typedef struct chx_cond {
-  struct {
-    struct chx_thread *next, *prev;
-  } q;
+  struct chx_qh q;
  struct chx_spinlock lock;
 } chopstx_cond_t;

@@ -82,25 +79,13 @@ void chopstx_cond_wait (chopstx_cond_t *cond, chopstx_mutex_t *mutex);
 void chopstx_cond_signal (chopstx_cond_t *cond);
 void chopstx_cond_broadcast (chopstx_cond_t *cond);

-typedef struct chx_intr {
-  struct chx_intr *next;
-  struct chx_thread *tp;
-  uint32_t ready;
-  uint8_t irq_num;
-} chopstx_intr_t;
-
-void chopstx_claim_irq (chopstx_intr_t *intr, uint8_t irq_num);
-void chopstx_release_irq (chopstx_intr_t *intr);
-
-void chopstx_intr_wait (chopstx_intr_t *intr);
-
 /*
 * Library provides default implementation as weak reference.
 * User can replace it.
  */
-void chx_fatal (uint32_t err_code) __attribute__((__weak__, __noreturn__));
+void chx_fatal (uint32_t err_code) __attribute__((__noreturn__));

-void chopstx_join (chopstx_t, void **);
+int chopstx_join (chopstx_t, void **);
 void chopstx_exit (void *retval) __attribute__((__noreturn__));


@@ -110,11 +95,7 @@ enum {
  CHOPSTX_ERR_JOIN,
 };

-enum {
-  CHOPSTX_EXIT_SUCCESS = 0,
-  CHOPSTX_EXIT_CANCELED         = 256,
-  CHOPSTX_EXIT_CANCELED_IN_SYNC = 257,
-};
+#define CHOPSTX_CANCELED ((void *) -1)

 void chopstx_cancel (chopstx_t thd);
 void chopstx_testcancel (void);
@@ -122,17 +103,61 @@ void chopstx_testcancel (void);
 /* NOTE: This signature is different to PTHREAD's one.  */
 int chopstx_setcancelstate (int);

-struct chx_cleanup {
+typedef struct chx_cleanup {
  struct chx_cleanup *next;
  void (*routine) (void *);
  void *arg;
-};
+} chopstx_cleanup_t;

 /* NOTE: This signature is different to PTHREAD's one.  */
-void chopstx_cleanup_push (struct chx_cleanup *clp);
+void chopstx_cleanup_push (chopstx_cleanup_t *clp);
 void chopstx_cleanup_pop (int execute);

+chopstx_prio_t chopstx_setpriority (chopstx_prio_t);

-void chopstx_wakeup_usec_wait (chopstx_t thd);
+enum {
+  CHOPSTX_POLL_COND = 0,
+  CHOPSTX_POLL_INTR,
+  CHOPSTX_POLL_JOIN,
+};

-#define CHOPSTX_THREAD_SIZE 60
+struct chx_poll_head {
+  uint16_t type;
+  uint16_t ready;
+};
+
+struct chx_poll_cond {
+  uint16_t type;
+  uint16_t ready;
+  /**/
+  chopstx_cond_t *cond;
+  chopstx_mutex_t *mutex;
+  int (*check) (void *);
+  void *arg;
+};
+typedef struct chx_poll_cond chopstx_poll_cond_t;
+
+struct chx_poll_join {
+  uint16_t type;
+  uint16_t ready;
+  /**/
+  chopstx_t thd;
+};
+typedef struct chx_poll_join chopstx_poll_join_t;
+
+struct chx_intr {
+  uint16_t type;
+  uint16_t ready;
+  /**/
+  uint8_t irq_num;
+};
+typedef struct chx_intr chopstx_intr_t;
+
+void chopstx_claim_irq (chopstx_intr_t *intr, uint8_t irq_num);
+
+void chopstx_intr_wait (chopstx_intr_t *intr); /* DEPRECATED */
+
+
+int chopstx_poll (uint32_t *usec_p, int n, struct chx_poll_head *pd_array[]);
+
+#define CHOPSTX_THREAD_SIZE 64
--- a/contrib/adc-gnu-linux.c
+++ b/contrib/adc-gnu-linux.c
@@ -0,0 +1,77 @@
+/*
+ * adc-gnu-linux.c - ADC driver for GNU/Linux emulation.
+ *                   This ADC driver just fills pseudo random values.
+ *                   It's completely useless other than for NeuG.
+ *
+ * Copyright (C) 2017  Free Software Initiative of Japan
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <chopstx.h>
+#include "adc.h"
+
+#define ADC_RANDOM_SEED 0x01034649 /* "Hello, father!" in Japanese */
+
+/*
+ * Do calibration for ADC.
+ */
+int
+adc_init (void)
+{
+  srandom (ADC_RANDOM_SEED);
+  return 0;
+}
+
+void
+adc_start (void)
+{
+}
+
+uint32_t adc_buf[64];
+
+void
+adc_start_conversion (int offset, int count)
+{
+  while (count--)
+    adc_buf[offset++] = random ();
+}
+
+
+void
+adc_stop (void)
+{
+}
+
+
+/*
+ * Return 0 on success.
+ * Return 1 on error.
+ */
+int
+adc_wait_completion (void)
+{
+  return 0;
+}
--- a/contrib/adc-mkl27z.c
+++ b/contrib/adc-mkl27z.c
@@ -0,0 +1,321 @@
+/*
+ * adc-mkl27z.c - ADC driver for MKL27Z
+ *               In this ADC driver, there are NeuG specific parts.
+ *               It only records lower 8-bit of 16-bit data.
+ *               You need to modify to use this as generic ADC driver.
+ *
+ * Copyright (C) 2016  Flying Stone Technology
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <chopstx.h>
+#include <mcu/mkl27z.h>
+
+struct DMAMUX {
+  volatile uint32_t CHCFG0;
+  volatile uint32_t CHCFG1;
+  volatile uint32_t CHCFG2;
+  volatile uint32_t CHCFG3;
+};
+static struct DMAMUX *const DMAMUX = (struct DMAMUX *)0x40021000;
+
+#define INTR_REQ_DMA0 0
+
+struct DMA {
+  volatile uint32_t SAR;
+  volatile uint32_t DAR;
+  volatile uint32_t DSR_BCR;
+  volatile uint32_t DCR;
+};
+static struct DMA *const DMA0 = (struct DMA *)0x40008100;
+static struct DMA *const DMA1 = (struct DMA *)0x40008110;
+
+
+/* We don't use ADC interrupt.  Just for reference.  */
+#define INTR_REQ_ADC 15
+
+struct ADC {
+  volatile uint32_t SC1[2];/* Status and Control Registers 1 */
+  volatile uint32_t CFG1;  /* Configuration Register 1       */
+  volatile uint32_t CFG2;  /* Configuration Register 2       */
+  volatile uint32_t R[2];  /* Data Result Register           */
+
+  /* Compare Value Registers 1, 2 */
+  volatile uint32_t CV1;
+  volatile uint32_t CV2;
+
+  volatile uint32_t SC2;   /* Status and Control Register 2  */
+  volatile uint32_t SC3;   /* Status and Control Register 3  */
+
+  volatile uint32_t OFS;   /* Offset Correction Register     */
+  volatile uint32_t PG;    /* Plus-Side Gain Register        */
+  volatile uint32_t MG;    /* Minus-Side Gain Register       */
+
+  /* Plus-Side General Calibration Value Registers */
+  volatile uint32_t CLPD;
+  volatile uint32_t CLPS;
+  volatile uint32_t CLP4;
+  volatile uint32_t CLP3;
+  volatile uint32_t CLP2;
+  volatile uint32_t CLP1;
+  volatile uint32_t CLP0;
+  uint32_t rsvd0;
+  /* Minus-Side General Calibration Value Registers */
+  volatile uint32_t CLMD;
+  volatile uint32_t CLMS;
+  volatile uint32_t CLM4;
+  volatile uint32_t CLM3;
+  volatile uint32_t CLM2;
+  volatile uint32_t CLM1;
+  volatile uint32_t CLM0;
+};
+static struct ADC *const ADC0 = (struct ADC *)0x4003B000;
+
+/* SC1 */
+#define ADC_SC1_DIFF            (1 << 5)
+#define ADC_SC1_AIEN            (1 << 6)
+#define ADC_SC1_COCO            (1 << 7)
+#define ADC_SC1_TEMPSENSOR      26
+#define ADC_SC1_BANDGAP         27
+#define ADC_SC1_ADCSTOP         31
+
+/* CFG1 */
+#define ADC_CLOCK_SOURCE_ASYNCH (3 << 0)
+#define ADC_MODE_16BIT          (3 << 2)
+#define ADC_ADLSMP_SHORT        (0 << 4)
+#define ADC_ADLSMP_LONG         (1 << 4)
+#define ADC_ADIV_1              (0 << 5)
+#define ADC_ADIV_8              (3 << 5)
+#define ADC_ADLPC_NORMAL        (0 << 7)
+#define ADC_ADLPC_LOWPOWER      (1 << 7)
+/**/
+#define ADC_CLOCK_SOURCE ADC_CLOCK_SOURCE_ASYNCH
+#define ADC_MODE         ADC_MODE_16BIT
+#define ADC_ADLSMP       ADC_ADLSMP_SHORT
+#define ADC_ADIV         ADC_ADIV_1
+#define ADC_ADLPC        ADC_ADLPC_LOWPOWER
+
+/* CFG2 */
+#define ADC_ADLSTS_DEFAULT      0 /* 24 cycles if CFG1.ADLSMP=1, 4 if not.  */
+#define ADC_ADHSC_NORMAL        (0 << 2)
+#define ADC_ADHSC_HIGHSPEED     (1 << 2)
+#define ADC_ADACK_DISABLE       (0 << 3)
+#define ADC_ADACK_ENABLE        (1 << 3)
+#define ADC_MUXSEL_A            (0 << 4)
+#define ADC_MUXSEL_B            (1 << 4)
+/**/
+#define ADC_ADLSTS       ADC_ADLSTS_DEFAULT 
+#define ADC_ADHSC        ADC_ADHSC_NORMAL
+#define ADC_ADACKEN      ADC_ADACK_ENABLE
+#define ADC_MUXSEL       ADC_MUXSEL_A
+
+/* SC2 */
+#define ADC_SC2_REFSEL_DEFAULT  1 /* Internal Voltage Reference??? */
+#define ADC_SC2_DMAEN           (1 << 2)
+#define ADC_SC2_ACREN           (1 << 3)
+#define ADC_SC2_ACFGT           (1 << 4)
+#define ADC_SC2_ACFE            (1 << 5)
+#define ADC_SC2_ADTRG		(1 << 6) /* For hardware trigger */
+
+/* SC3 */
+#define ADC_SC3_AVGS11          0x03
+#define ADC_SC3_AVGE            (1 << 2)
+#define ADC_SC3_ADCO            (1 << 3)
+#define ADC_SC3_CALF            (1 << 6)
+#define ADC_SC3_CAL             (1 << 7)
+
+#define ADC_DMA_SLOT_NUM 40
+
+/*
+ * Buffer to save ADC data.
+ */
+uint32_t adc_buf[64];
+
+static const uint32_t adc0_sc1_setting = ADC_SC1_TEMPSENSOR;
+
+static chopstx_intr_t adc_intr;
+
+struct adc_internal {
+  uint32_t buf[64];
+  uint8_t *p;
+  int phase : 8;
+  int count : 8;
+};
+struct adc_internal adc;
+
+/*
+ * Initialize ADC module, do calibration.
+ *
+ * This is called by MAIN, only once, hopefully before creating any
+ * other threads (to be accurate).
+ *
+ * We configure ADC0 to kick DMA0, configure DMA0 to kick DMA1.
+ * DMA0 records output of ADC0 to the ADC.BUF.
+ * DMA1 kicks ADC0 again to get another value.
+ *
+ * ADC0 --[finish conversion]--> DMA0 --[Link channel 1]--> DMA1
+ */
+int
+adc_init (void)
+{
+  uint32_t v;
+
+  /* Enable ADC0 and DMAMUX clock.  */
+  SIM->SCGC6 |= (1 << 27) | (1 << 1);
+  /* Enable DMA clock.  */
+  SIM->SCGC7 |= (1 << 8);
+
+  /* ADC0 setting for calibration.  */
+  ADC0->CFG1 = ADC_CLOCK_SOURCE | ADC_MODE | ADC_ADLSMP | ADC_ADIV | ADC_ADLPC;
+  ADC0->CFG2 = ADC_ADLSTS | ADC_ADHSC | ADC_ADACKEN | ADC_MUXSEL;
+  ADC0->SC2 = ADC_SC2_REFSEL_DEFAULT;
+  ADC0->SC3 = ADC_SC3_CAL | ADC_SC3_CALF | ADC_SC3_AVGE | ADC_SC3_AVGS11;
+
+  /* Wait ADC completion */
+  while ((ADC0->SC1[0] & ADC_SC1_COCO) == 0)
+    if ((ADC0->SC3 & ADC_SC3_CALF) != 0)
+      /* Calibration failure */
+      return -1;
+
+  if ((ADC0->SC3 & ADC_SC3_CALF) != 0)
+    /* Calibration failure */
+    return -1;
+
+  /* Configure PG by the calibration values.  */
+  v = ADC0->CLP0 + ADC0->CLP1 + ADC0->CLP2 + ADC0->CLP3 + ADC0->CLP4 + ADC0->CLPS;
+  ADC0->PG = 0x8000 | (v >> 1);
+
+  /* Configure MG by the calibration values.  */
+  v = ADC0->CLM0 + ADC0->CLM1 + ADC0->CLM2 + ADC0->CLM3 + ADC0->CLM4 + ADC0->CLMS;
+  ADC0->MG = 0x8000 | (v >> 1);
+
+  ADC0->SC1[0] = ADC_SC1_ADCSTOP;
+
+  /* DMAMUX setting.  */
+  DMAMUX->CHCFG0 = (1 << 7) | ADC_DMA_SLOT_NUM;
+
+  /* DMA0 initial setting.  */
+  DMA0->SAR = (uint32_t)&ADC0->R[0];
+
+  /* DMA1 initial setting.  */
+  DMA1->SAR = (uint32_t)&adc0_sc1_setting;
+  DMA1->DAR = (uint32_t)&ADC0->SC1[0];
+  
+  chopstx_claim_irq (&adc_intr, INTR_REQ_DMA0);
+  return 0;
+}
+
+/*
+ * Start using ADC.
+ */
+void
+adc_start (void)
+{
+  ADC0->CFG1 = ADC_CLOCK_SOURCE | ADC_MODE | ADC_ADLSMP | ADC_ADIV | ADC_ADLPC;
+  ADC0->CFG2 = ADC_ADLSTS | ADC_ADHSC | ADC_ADACKEN | ADC_MUXSEL;
+  ADC0->SC2 = ADC_SC2_REFSEL_DEFAULT | ADC_SC2_DMAEN;
+  ADC0->SC3 = 0;
+}
+
+/*
+ * Kick getting data for COUNT times.
+ * Data will be saved in ADC_BUF starting at OFFSET.
+ */
+static void
+adc_start_conversion_internal (int count)
+{
+  /* DMA0 setting.  */
+  DMA0->DAR = (uint32_t)&adc.buf[0];
+  DMA0->DSR_BCR = 4 * count;
+  DMA0->DCR = (1 << 31) | (1 << 30) | (1 << 29) | (0 << 20) | (1 << 19)
+            | (0 << 17) | (1 <<  7) | (2 <<  4) | (1 <<  2);
+
+  /* Kick DMA1.  */
+  DMA1->DSR_BCR = 4 * count;
+  DMA1->DCR = (1 << 30) | (1 << 29) | (0 << 19) | (0 << 17) | (1 << 16) | (1 << 7);
+}
+
+
+/*
+ * Kick getting data for COUNT times.
+ * Data will be saved in ADC_BUF starting at OFFSET.
+ */
+void
+adc_start_conversion (int offset, int count)
+{
+  adc.p = (uint8_t *)&adc_buf[offset];
+  adc.phase = 0;
+  adc.count = count;
+  adc_start_conversion_internal (count);
+}
+
+
+static void
+adc_stop_conversion (void)
+{
+  ADC0->SC1[0] = ADC_SC1_ADCSTOP;
+}
+
+/*
+ * Stop using ADC.
+ */
+void
+adc_stop (void)
+{
+  SIM->SCGC6 &= ~(1 << 27);
+}
+
+/*
+ * Return 0 on success.
+ * Return 1 on error.
+ */
+int
+adc_wait_completion (void)
+{
+  struct chx_poll_head *pd_array[1] = { (struct chx_poll_head *)&adc_intr };
+  int i;
+
+  while (1)
+    {
+      /* Wait DMA completion */
+      chopstx_poll (NULL, 1, pd_array);
+
+      DMA0->DSR_BCR = (1 << 24);
+      DMA1->DSR_BCR = (1 << 24);
+
+      adc_stop_conversion ();
+
+      for (i = 0; i < adc.count; i++)
+	*adc.p++ = (uint8_t)adc.buf[i];
+
+      if (++adc.phase >= 4)
+	break;
+
+      adc_start_conversion_internal (adc.count);
+    }
+
+  return 0;
+}
--- a/contrib/adc-stm32f103.c
+++ b/contrib/adc-stm32f103.c
@@ -0,0 +1,329 @@
+/*
+ * adc_stm32f103.c - ADC driver for STM32F103
+ *                   In this ADC driver, there are NeuG specific parts.
+ *                   You need to modify to use this as generic ADC driver.
+ *
+ * Copyright (C) 2011, 2012, 2013, 2015, 2016
+ *               Free Software Initiative of Japan
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <chopstx.h>
+#include <mcu/stm32f103.h>
+#include "adc.h"
+
+#define STM32_ADC_ADC1_DMA_PRIORITY         2
+
+#define ADC_SMPR1_SMP_VREF(n)   ((n) << 21)
+#define ADC_SMPR1_SMP_SENSOR(n) ((n) << 18)
+
+#define ADC_SMPR1_SMP_AN10(n)   ((n) << 0)
+#define ADC_SMPR1_SMP_AN11(n)   ((n) << 3)
+
+#define ADC_SMPR2_SMP_AN0(n)    ((n) << 0)
+#define ADC_SMPR2_SMP_AN1(n)    ((n) << 3)
+#define ADC_SMPR2_SMP_AN2(n)    ((n) << 6)
+#define ADC_SMPR2_SMP_AN9(n)    ((n) << 27)
+
+#define ADC_SQR1_NUM_CH(n)      (((n) - 1) << 20)
+
+#define ADC_SQR3_SQ1_N(n)       ((n) << 0)
+#define ADC_SQR3_SQ2_N(n)       ((n) << 5)
+#define ADC_SQR3_SQ3_N(n)       ((n) << 10)
+#define ADC_SQR3_SQ4_N(n)       ((n) << 15)
+
+#define ADC_SAMPLE_1P5          0
+
+#define ADC_CHANNEL_IN0         0
+#define ADC_CHANNEL_IN1         1
+#define ADC_CHANNEL_IN2         2
+#define ADC_CHANNEL_IN9         9
+#define ADC_CHANNEL_IN10        10
+#define ADC_CHANNEL_IN11        11
+#define ADC_CHANNEL_SENSOR      16
+#define ADC_CHANNEL_VREFINT     17
+
+#define DELIBARATELY_DO_IT_WRONG_VREF_SAMPLE_TIME
+#define DELIBARATELY_DO_IT_WRONG_START_STOP
+
+#ifdef DELIBARATELY_DO_IT_WRONG_VREF_SAMPLE_TIME
+#define ADC_SAMPLE_VREF ADC_SAMPLE_1P5
+#define ADC_SAMPLE_SENSOR ADC_SAMPLE_1P5
+#else
+#define ADC_SAMPLE_VREF ADC_SAMPLE_239P5
+#define ADC_SAMPLE_SENSOR ADC_SAMPLE_239P5
+#endif
+
+#define NEUG_DMA_CHANNEL STM32_DMA1_STREAM1
+#define NEUG_DMA_MODE							\
+  (  STM32_DMA_CR_PL (STM32_ADC_ADC1_DMA_PRIORITY)			\
+     | STM32_DMA_CR_MSIZE_WORD | STM32_DMA_CR_PSIZE_WORD		\
+     | STM32_DMA_CR_MINC       | STM32_DMA_CR_TCIE			\
+     | STM32_DMA_CR_TEIE  )
+
+#define NEUG_ADC_SETTING1_SMPR1 ADC_SMPR1_SMP_VREF(ADC_SAMPLE_VREF)     \
+                              | ADC_SMPR1_SMP_SENSOR(ADC_SAMPLE_SENSOR)
+#define NEUG_ADC_SETTING1_SMPR2 0
+#define NEUG_ADC_SETTING1_SQR3  ADC_SQR3_SQ1_N(ADC_CHANNEL_VREFINT)     \
+                              | ADC_SQR3_SQ2_N(ADC_CHANNEL_SENSOR)      \
+                              | ADC_SQR3_SQ3_N(ADC_CHANNEL_SENSOR)      \
+                              | ADC_SQR3_SQ4_N(ADC_CHANNEL_VREFINT)
+#define NEUG_ADC_SETTING1_NUM_CHANNELS 4
+
+/*
+ * ADC finish interrupt
+ */
+#define INTR_REQ_DMA1_Channel1 11
+
+static chopstx_intr_t adc_intr;
+
+/*
+ * Do calibration for both of ADCs.
+ */
+int
+adc_init (void)
+{
+  RCC->APB2ENR |= (RCC_APB2ENR_ADC1EN | RCC_APB2ENR_ADC2EN);
+  RCC->APB2RSTR = (RCC_APB2RSTR_ADC1RST | RCC_APB2RSTR_ADC2RST);
+  RCC->APB2RSTR = 0;
+
+  ADC1->CR1 = 0;
+  ADC1->CR2 = ADC_CR2_ADON;
+  ADC1->CR2 = ADC_CR2_ADON | ADC_CR2_RSTCAL;
+  while ((ADC1->CR2 & ADC_CR2_RSTCAL) != 0)
+    ;
+  ADC1->CR2 = ADC_CR2_ADON | ADC_CR2_CAL;
+  while ((ADC1->CR2 & ADC_CR2_CAL) != 0)
+    ;
+  ADC1->CR2 = 0;
+
+  ADC2->CR1 = 0;
+  ADC2->CR2 = ADC_CR2_ADON;
+  ADC2->CR2 = ADC_CR2_ADON | ADC_CR2_RSTCAL;
+  while ((ADC2->CR2 & ADC_CR2_RSTCAL) != 0)
+    ;
+  ADC2->CR2 = ADC_CR2_ADON | ADC_CR2_CAL;
+  while ((ADC2->CR2 & ADC_CR2_CAL) != 0)
+    ;
+  ADC2->CR2 = 0;
+  RCC->APB2ENR &= ~(RCC_APB2ENR_ADC1EN | RCC_APB2ENR_ADC2EN);
+
+  chopstx_claim_irq (&adc_intr, INTR_REQ_DMA1_Channel1);
+  return 0;
+}
+
+#include "board.h"
+#include "sys.h"
+
+static void
+get_adc_config (uint32_t config[4])
+{
+  config[2] = ADC_SQR1_NUM_CH(2);
+  switch (SYS_BOARD_ID)
+    {
+    case BOARD_ID_FST_01:
+      config[0] = 0;
+      config[1] = ADC_SMPR2_SMP_AN0(ADC_SAMPLE_1P5)
+		| ADC_SMPR2_SMP_AN9(ADC_SAMPLE_1P5);
+      config[3] = ADC_SQR3_SQ1_N(ADC_CHANNEL_IN0)
+		| ADC_SQR3_SQ2_N(ADC_CHANNEL_IN9);
+      break;
+
+    case BOARD_ID_OLIMEX_STM32_H103:
+    case BOARD_ID_STBEE:
+      config[0] = ADC_SMPR1_SMP_AN10(ADC_SAMPLE_1P5)
+		| ADC_SMPR1_SMP_AN11(ADC_SAMPLE_1P5);
+      config[1] = 0;
+      config[3] = ADC_SQR3_SQ1_N(ADC_CHANNEL_IN10)
+		| ADC_SQR3_SQ2_N(ADC_CHANNEL_IN11);
+      break;
+
+    case BOARD_ID_STBEE_MINI:
+      config[0] = 0;
+      config[1] = ADC_SMPR2_SMP_AN1(ADC_SAMPLE_1P5)
+		| ADC_SMPR2_SMP_AN2(ADC_SAMPLE_1P5);
+      config[3] = ADC_SQR3_SQ1_N(ADC_CHANNEL_IN1)
+		| ADC_SQR3_SQ2_N(ADC_CHANNEL_IN2);
+      break;
+
+    case BOARD_ID_CQ_STARM:
+    case BOARD_ID_FST_01_00:
+    case BOARD_ID_MAPLE_MINI:
+    case BOARD_ID_STM32_PRIMER2:
+    case BOARD_ID_STM8S_DISCOVERY:
+    case BOARD_ID_ST_DONGLE:
+    case BOARD_ID_ST_NUCLEO_F103:
+    case BOARD_ID_NITROKEY_START:
+    default:
+      config[0] = 0;
+      config[1] = ADC_SMPR2_SMP_AN0(ADC_SAMPLE_1P5)
+		| ADC_SMPR2_SMP_AN1(ADC_SAMPLE_1P5);
+      config[3] = ADC_SQR3_SQ1_N(ADC_CHANNEL_IN0)
+		| ADC_SQR3_SQ2_N(ADC_CHANNEL_IN1);
+      break;
+    }
+}
+
+
+void
+adc_start (void)
+{
+  uint32_t config[4];
+
+  get_adc_config (config);
+
+  /* Use DMA channel 1.  */
+  RCC->AHBENR |= RCC_AHBENR_DMA1EN;
+  DMA1_Channel1->CCR = STM32_DMA_CCR_RESET_VALUE;
+  DMA1->IFCR = 0xffffffff;
+
+  RCC->APB2ENR |= (RCC_APB2ENR_ADC1EN | RCC_APB2ENR_ADC2EN);
+
+  ADC1->CR1 = (ADC_CR1_DUALMOD_2 | ADC_CR1_DUALMOD_1 | ADC_CR1_DUALMOD_0
+	       | ADC_CR1_SCAN);
+  ADC1->CR2 = (ADC_CR2_TSVREFE | ADC_CR2_EXTTRIG | ADC_CR2_SWSTART
+	       | ADC_CR2_EXTSEL | ADC_CR2_DMA | ADC_CR2_CONT | ADC_CR2_ADON);
+  ADC1->SMPR1 = NEUG_ADC_SETTING1_SMPR1;
+  ADC1->SMPR2 = NEUG_ADC_SETTING1_SMPR2;
+  ADC1->SQR1 = ADC_SQR1_NUM_CH(NEUG_ADC_SETTING1_NUM_CHANNELS);
+  ADC1->SQR2 = 0;
+  ADC1->SQR3 = NEUG_ADC_SETTING1_SQR3;
+
+  ADC2->CR1 = (ADC_CR1_DUALMOD_2 | ADC_CR1_DUALMOD_1 | ADC_CR1_DUALMOD_0
+	       | ADC_CR1_SCAN);
+  ADC2->CR2 = ADC_CR2_EXTTRIG | ADC_CR2_CONT | ADC_CR2_ADON;
+  ADC2->SMPR1 = config[0];
+  ADC2->SMPR2 = config[1];
+  ADC2->SQR1 = config[2];
+  ADC2->SQR2 = 0;
+  ADC2->SQR3 = config[3];
+
+#ifdef DELIBARATELY_DO_IT_WRONG_START_STOP
+  /*
+   * We could just let ADC run continuously always and only enable DMA
+   * to receive stable data from ADC.  But our purpose is not to get
+   * correct data but noise.  In fact, we can get more noise when we
+   * start/stop ADC each time.
+   */
+  ADC2->CR2 = 0;
+  ADC1->CR2 = 0;
+#else
+  /* Start conversion.  */
+  ADC2->CR2 = ADC_CR2_EXTTRIG | ADC_CR2_CONT | ADC_CR2_ADON;
+  ADC1->CR2 = (ADC_CR2_TSVREFE | ADC_CR2_EXTTRIG | ADC_CR2_SWSTART
+	       | ADC_CR2_EXTSEL | ADC_CR2_DMA | ADC_CR2_CONT | ADC_CR2_ADON);
+#endif
+}
+
+uint32_t adc_buf[64];
+
+void
+adc_start_conversion (int offset, int count)
+{
+  DMA1_Channel1->CPAR = (uint32_t)&ADC1->DR;        /* SetPeripheral */
+  DMA1_Channel1->CMAR = (uint32_t)&adc_buf[offset]; /* SetMemory0    */
+  DMA1_Channel1->CNDTR = count;                     /* Counter       */
+  DMA1_Channel1->CCR = NEUG_DMA_MODE | DMA_CCR1_EN; /* Mode   */
+
+#ifdef DELIBARATELY_DO_IT_WRONG_START_STOP
+  /* Power on */
+  ADC2->CR2 = ADC_CR2_EXTTRIG | ADC_CR2_CONT | ADC_CR2_ADON;
+  ADC1->CR2 = (ADC_CR2_TSVREFE | ADC_CR2_EXTTRIG | ADC_CR2_SWSTART
+	       | ADC_CR2_EXTSEL | ADC_CR2_DMA | ADC_CR2_CONT | ADC_CR2_ADON);
+  /*
+   * Start conversion.  tSTAB is 1uS, but we don't follow the spec, to
+   * get more noise.
+   */
+  ADC2->CR2 = ADC_CR2_EXTTRIG | ADC_CR2_CONT | ADC_CR2_ADON;
+  ADC1->CR2 = (ADC_CR2_TSVREFE | ADC_CR2_EXTTRIG | ADC_CR2_SWSTART
+	       | ADC_CR2_EXTSEL | ADC_CR2_DMA | ADC_CR2_CONT | ADC_CR2_ADON);
+#endif
+}
+
+
+static void adc_stop_conversion (void)
+{
+  DMA1_Channel1->CCR &= ~DMA_CCR1_EN;
+
+#ifdef DELIBARATELY_DO_IT_WRONG_START_STOP
+  ADC2->CR2 = 0;
+  ADC1->CR2 = 0;
+#endif
+}
+
+void
+adc_stop (void)
+{
+  ADC1->CR1 = 0;
+  ADC1->CR2 = 0;
+
+  ADC2->CR1 = 0;
+  ADC2->CR2 = 0;
+
+  RCC->AHBENR &= ~RCC_AHBENR_DMA1EN;
+  RCC->APB2ENR &= ~(RCC_APB2ENR_ADC1EN | RCC_APB2ENR_ADC2EN);
+}
+
+
+static uint32_t adc_err;
+
+/*
+ * Return 0 on success.
+ * Return 1 on error.
+ */
+int
+adc_wait_completion (void)
+{
+  uint32_t flags;
+  struct chx_poll_head *pd_array[1] = { (struct chx_poll_head *)&adc_intr };
+
+  while (1)
+    {
+      chopstx_poll (NULL, 1, pd_array);
+      flags = DMA1->ISR & STM32_DMA_ISR_MASK; /* Channel 1 interrupt cause.  */
+      /*
+       * Clear interrupt cause of channel 1.
+       *
+       * Note that CGIFx=0, as CGIFx=1 clears all of GIF, HTIF, TCIF
+       * and TEIF.
+       */
+      DMA1->IFCR = (flags & ~1);
+
+      if ((flags & STM32_DMA_ISR_TEIF) != 0)  /* DMA errors  */
+	{
+	  /* Should never happened.  If any, it's coding error. */
+	  /* Access an unmapped address space or alignment violation.  */
+	  adc_err++;
+	  adc_stop_conversion ();
+	  return 1;
+	}
+      else if ((flags & STM32_DMA_ISR_TCIF) != 0) /* Transfer complete */
+	{
+	  adc_stop_conversion ();
+	  return 0;
+	}
+    }
+}
--- a/doc/chopstx-api.texi
+++ b/doc/chopstx-api.texi
@@ -7,16 +7,6 @@ When it detects a coding error, this function will be called to
 stop further execution of code.  It never returns.
@end deftypefun

-@subheading chopstx_main_init
-@anchor{chopstx_main_init}
-@deftypefun {void} {chopstx_main_init} (chopstx_prio_t @var{prio})
-@var{prio}: priority
-
-Initialize main thread with @var{prio}.
-The thread main is created with priority CHX_PRIO_MAIN_INIT,
-and it runs with that priority until this routine will is called.
-@end deftypefun
-
@subheading chopstx_create
@anchor{chopstx_create}
@deftypefun {chopstx_t} {chopstx_create} (uint32_t @var{flags_and_prio}, uint32_t @var{stack_addr}, size_t @var{stack_size}, voidfunc @var{thread_entry}, void * @var{arg})
@@ -33,15 +23,6 @@ and it runs with that priority until this routine will is called.
 Create a thread.  Returns thread ID.
@end deftypefun

-@subheading chopstx_usec_wait_var
-@anchor{chopstx_usec_wait_var}
-@deftypefun {void} {chopstx_usec_wait_var} (uint32_t * @var{var})
-@var{var}: Pointer to usec
-
-Sleep for micro seconds, specified by @var{var}.
-Another thread can clear @var{var} to stop the caller going into sleep.
-@end deftypefun
-
@subheading chopstx_usec_wait
@anchor{chopstx_usec_wait}
@deftypefun {void} {chopstx_usec_wait} (uint32_t @var{usec})
@@ -115,15 +96,7 @@ Wake up all threads waiting on @var{cond}.

@var{irq_num}: IRQ Number (hardware specific)

-Claim interrupt @var{intr} with @var{irq_num} for this thread.
-@end deftypefun
-
-@subheading chopstx_release_irq
-@anchor{chopstx_release_irq}
-@deftypefun {void} {chopstx_release_irq} (chopstx_intr_t * @var{intr0})
-@var{intr0}: Interrupt request to be unregistered
-
-Release the interrupt request specified by @var{intr0}.
+Claim interrupt @var{intr} with @var{irq_num}
@end deftypefun

@subheading chopstx_intr_wait
@@ -156,29 +129,21 @@ clean-up will be executed.
@deftypefun {void} {chopstx_exit} (void * @var{retval})
@var{retval}: Return value (to be caught by a joining thread)

-Calling this function terminates the execution of thread, after
-calling clean up functions.  If the calling thread still holds
-mutexes, they will be released.  If the calling thread claiming
-IRQ, it will be released, too.  This function never returns.
+Calling this function terminates the execution of running thread,
+after calling clean up functions.  If the calling thread still
+holds mutexes, they will be released.  This function never
+returns.
@end deftypefun

@subheading chopstx_join
@anchor{chopstx_join}
-@deftypefun {void} {chopstx_join} (chopstx_t @var{thd}, void ** @var{ret})
+@deftypefun {int} {chopstx_join} (chopstx_t @var{thd}, void ** @var{ret})
@var{thd}: Thread to wait

@var{ret}: Pointer to void * to store return value

 Waits for the thread of @var{thd} to terminate.
-@end deftypefun
-
-@subheading chopstx_wakeup_usec_wait
-@anchor{chopstx_wakeup_usec_wait}
-@deftypefun {void} {chopstx_wakeup_usec_wait} (chopstx_t @var{thd})
-@var{thd}: Thread to be awakened
-
-Canceling the timer, wake up the sleeping thread.
-No return value.
+Returns 0 on success, 1 when waiting is interrupted.
@end deftypefun

@subheading chopstx_cancel
@@ -209,3 +174,30 @@ Calling chopstx_setcancelstate sets cancelability state.
 Returns old state which is 0 when it was enabled.
@end deftypefun

+@subheading chopstx_poll
+@anchor{chopstx_poll}
+@deftypefun {int} {chopstx_poll} (uint32_t * @var{usec_p}, int @var{n}, struct chx_poll_head * [] @var{pd_array})
+@var{usec_p}: Pointer to usec for timeout.  Forever if NULL.
+
+@var{n}: Number of poll descriptors
+
+@var{pd_array}: Pointer to an array of poll descriptor pointer which
+should be one of:
+chopstx_poll_cond_t, chopstx_poll_join_t, or chopstx_intr_t.
+
+Returns number of active descriptors.
+@end deftypefun
+
+@subheading chopstx_setpriority
+@anchor{chopstx_setpriority}
+@deftypefun {chopstx_prio_t} {chopstx_setpriority} (chopstx_prio_t @var{prio_new})
+Change the schedule priority with @var{prio}.
+Returns the old priority.
+
+In general, it is not recommended to use this function because
+dynamically changing schedule priorities complicates the system.
+Only a possible valid usage of this function is in the main thread
+which starts its execution with priority of CHX_PRIO_MAIN_INIT, and
+let it change its priority after initialization of other threads.
+@end deftypefun
+
--- a/doc/chopstx.texi
+++ b/doc/chopstx.texi
@@ -1,7 +1,7 @@
 \input texinfo                      @c -*-texinfo-*-
@c %**start of header
@setfilename chopstx.info
-@set VERSION 0.10
+@set VERSION 1.4
@settitle Chopstx Reference Manual
@c Unify some of the indices.
@syncodeindex tp fn
@@ -11,7 +11,7 @@
 This manual is for Chopstx (version @value{VERSION}).

@noindent
-Copyright @copyright{} 2013, 2015 Flying Stone Technology @*
+Copyright @copyright{} 2013, 2015, 2016 Flying Stone Technology @*

@quotation
 Permission is granted to copy, distribute and/or modify this document
@@ -83,8 +83,9 @@ Indexes
@node Introduction
@chapter Introduction

-Chopstx is an RT thread library for ARM Cortex-M0 and Cortex-M3.
-Specifically, it is used for STM32F030 and STM32F103.
+Chopstx is an RT thread library for ARM Cortex-M0, Cortex-M0plus and
+Cortex-M3.  Specifically, it is used for STM32F030, MKL27Z and
+STM32F103.

 While most RTOSes come with many features, drivers, and stacks,
 Chopstx just offers a RT thread library.
--- a/entry.c
+++ b/entry.c
@@ -1,7 +1,8 @@
 /*
 * entry.c - Entry routine when reset and interrupt vectors.
 *
- * Copyright (C) 2013, 2014, 2015  Flying Stone Technology
+ * Copyright (C) 2013, 2014, 2015, 2016, 2017
+ *               Flying Stone Technology
 * Author: NIIBE Yutaka <gniibe@fsij.org>
 *
 * This file is a part of Chopstx, a thread library for embedded.
@@ -30,14 +31,36 @@
 #include <stdlib.h>
 #include <chopstx.h>

-#ifdef HAVE_SYS_H
-#define INLINE __attribute__ ((used))
-#include "sys.h"
 #include "board.h"
-#undef STM32F10X_MD		/* Prepare for high density device, too.  */
+
+#ifdef GNU_LINUX_EMULATION
+int emulated_main (int, const char **);
+void chx_init (struct chx_thread *);
+void chx_systick_init (void);
+extern struct chx_thread main_thread;
+
+int
+main (int argc, const char *argv[])
+{
+  chx_init (&main_thread);
+  chx_systick_init ();
+  emulated_main (argc, argv);
+}
 #else
-#include "board.h"
-#include "clk_gpio_init.c"
+#if defined(USE_SYS3) || defined(USE_SYS_CLOCK_GPIO_SETTING)
+#define REQUIRE_CLOCK_GPIO_SETTING_IN_SYS
+#include "sys.h"
+/*
+ * Avoid medium density specific code and prepare for high density
+ * device, too.
+ */
+#undef STM32F10X_MD
+#else
+#if defined (MCU_KINETIS_L)
+#include "mcu/clk_gpio_init-mkl27z.c"
+#else
+#include "mcu/clk_gpio_init-stm32.c"
+#endif
 #endif


@@ -48,7 +71,9 @@
 #endif

 extern uint8_t __main_stack_end__;
+#if defined(__ARM_ARCH_7M__)
 extern void svc (void);
+#endif
 extern void preempt (void);
 extern void chx_timer_expired (void);
 extern void chx_handle_intr (void);
@@ -60,18 +85,7 @@ static void nmi (void)

 static void hard_fault (void)
 {
-#if defined(__ARM_ARCH_6M__)
-  register uint32_t primask;
-
-  asm ("mrs	%0, PRIMASK" : "=r" (primask));
-
-  if (primask)
-    asm volatile ("b	svc");
-  else
  for (;;);
-#else
-  for (;;);
-#endif
 }

 static void mem_manage (void)
@@ -105,7 +119,8 @@ uint32_t vectors_in_ram[48];
 * This routine only changes PSP and not MSP.
 */
 STATIC_ENTRY __attribute__ ((naked,section(".text.startup.0")))
-void entry (void)
+void
+entry (void)
 {
  asm volatile ("bl	clock_init\n\t"
 		/* Clear BSS section.  */
@@ -169,7 +184,7 @@ void entry (void)
 typedef void (*handler)(void);

 handler vector_table[] __attribute__ ((section(".startup.vectors"))) = {
-  (handler)&__main_stack_end__,
+  (handler)(&__main_stack_end__ - 32),
  entry,
  nmi,		/* nmi */
  hard_fault,		/* hard fault */
@@ -180,7 +195,11 @@ handler vector_table[] __attribute__ ((section(".startup.vectors"))) = {
  none,
  /* 0x20 */
  none, none, none,		/* reserved */
+#if defined(__ARM_ARCH_6M__)
+  none,				/* SVCall */
+#elif defined(__ARM_ARCH_7M__)
  svc,				/* SVCall */
+#endif  
  none,				/* Debug */
  none,				/* reserved */
  preempt,			/* PendSV */
@@ -221,3 +240,4 @@ handler vector_table[] __attribute__ ((section(".startup.vectors"))) = {
  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
 #endif
 };
+#endif
--- a/eventflag.c
+++ b/eventflag.c
@@ -1,7 +1,7 @@
 /*
- * eventflag.c - Eventflag with/without timeout
+ * eventflag.c - Eventflag
 *
- * Copyright (C) 2013 Flying Stone Technology
+ * Copyright (C) 2013, 2016  Flying Stone Technology
 * Author: NIIBE Yutaka <gniibe@fsij.org>
 *
 * This file is a part of Chopstx, a thread library for embedded.
@@ -31,24 +31,55 @@
 #include <chopstx.h>
 #include <eventflag.h>

-enum {
-  EVENTFLAG_ERR_WAIT = CHOPSTX_ERR_JOIN + 1,
-  EVENTFLAG_ERR_TIMED_WAIT,
-};
+
+void
+eventflag_init (struct eventflag *ev)
+{
+  ev->flags = 0;
+  chopstx_cond_init (&ev->cond);
+  chopstx_mutex_init (&ev->mutex);
+}
+
+
+static int
+eventflag_check (void *arg)
+{
+  struct eventflag *ev = arg;
+
+  return ev->flags != 0;
+}


 void
-eventflag_init (struct eventflag *ev, chopstx_t sleeper)
+eventflag_prepare_poll (struct eventflag *ev, chopstx_poll_cond_t *poll_desc)
 { 
-  ev->sleeper = sleeper;
+  poll_desc->type = CHOPSTX_POLL_COND;
+  poll_desc->ready = 0;
+  poll_desc->cond = &ev->cond;
+  poll_desc->mutex = &ev->mutex;
+  poll_desc->check = eventflag_check;
+  poll_desc->arg = ev;
+}

-  if (sleeper)
-    ev->u.wait_usec = 0;
+
+eventmask_t
+eventflag_get (struct eventflag *ev)
+{
+  int n;
+  eventmask_t m;
+
+  chopstx_mutex_lock (&ev->mutex);
+  n = __builtin_ffs (ev->flags);
+  if (n)
+    {
+      m = (1 << (n - 1));
+      ev->flags &= ~m;
+    }
  else
-    chopstx_cond_init (&ev->u.cond);
+    m = 0;
+  chopstx_mutex_unlock (&ev->mutex);

-  ev->flag = 0;
-  chopstx_mutex_init (&ev->mutex);
+  return m;
 }


@@ -56,50 +87,35 @@ eventmask_t
 eventflag_wait (struct eventflag *ev)
 {
  int n;
-
-  if (ev->sleeper)
-    chx_fatal (EVENTFLAG_ERR_WAIT);
+  eventmask_t m;

  chopstx_mutex_lock (&ev->mutex);
-  if (!ev->flag)
-    chopstx_cond_wait (&ev->u.cond, &ev->mutex);
+  if (!ev->flags)
+    chopstx_cond_wait (&ev->cond, &ev->mutex);

-  n = __builtin_ffs (ev->flag);
-  ev->flag &= ~(1 << (n - 1));
+  n = __builtin_ffs (ev->flags);
+  if (n) /* Always n > 0 when waked up, but make sure no bad things.  */
+    {
+      m = (1 << (n - 1));
+      ev->flags &= ~m;
+    }
+  else
+    m = 0;
  chopstx_mutex_unlock (&ev->mutex);

-  return (1 << (n - 1));
+  return m;
 }

+
 eventmask_t
 eventflag_wait_timeout (struct eventflag *ev, uint32_t usec)
 {
-  eventmask_t em = 0;
-  int n;
+  chopstx_poll_cond_t poll_desc;
+  struct chx_poll_head *pd_array[1] = { (struct chx_poll_head *)&poll_desc };

-  if (ev->sleeper == 0)
-    chx_fatal (EVENTFLAG_ERR_TIMED_WAIT);
-
-  chopstx_mutex_lock (&ev->mutex);
-
-  if (!ev->flag)
-    {
-      ev->u.wait_usec = usec;
-      chopstx_mutex_unlock (&ev->mutex);
-      chopstx_usec_wait_var (&ev->u.wait_usec);
-      chopstx_mutex_lock (&ev->mutex);
-      ev->u.wait_usec = 0;
-    }
-
-  n = __builtin_ffs (ev->flag);
-  if (n)
-    {
-      em = (1 << (n - 1));
-      ev->flag &= ~em;
-    }
-
-  chopstx_mutex_unlock (&ev->mutex);
-  return em;
+  eventflag_prepare_poll (ev, &poll_desc);
+  chopstx_poll (&usec, 1, pd_array);
+  return eventflag_get (ev);
 }


@@ -107,16 +123,7 @@ void
 eventflag_signal (struct eventflag *ev, eventmask_t m)
 {
  chopstx_mutex_lock (&ev->mutex);
-  ev->flag |= m;
-  if (ev->sleeper)
-    {
-      if (ev->u.wait_usec)
-	{
-	  ev->u.wait_usec = 0;
-	  chopstx_wakeup_usec_wait (ev->sleeper);
-	}
-    }
-  else
-    chopstx_cond_signal (&ev->u.cond);
+  ev->flags |= m;
+  chopstx_cond_signal (&ev->cond);
  chopstx_mutex_unlock (&ev->mutex);
 }
--- a/eventflag.h
+++ b/eventflag.h
@@ -1,16 +1,16 @@
 typedef uint32_t eventmask_t;

 struct eventflag {
-  chopstx_t sleeper;
-  eventmask_t flag;
+  eventmask_t flags;
  chopstx_mutex_t mutex;
-  union {
-    uint32_t wait_usec;
  chopstx_cond_t cond;
-  } u;
 };

-void eventflag_init (struct eventflag *ev, chopstx_t owner);
+void eventflag_init (struct eventflag *ev);
 eventmask_t eventflag_wait (struct eventflag *ev);
 eventmask_t eventflag_wait_timeout (struct eventflag *ev, uint32_t usec);
 void eventflag_signal (struct eventflag *ev, eventmask_t m);
+
+/* For polling */
+void eventflag_prepare_poll (struct eventflag *ev, chopstx_poll_cond_t *p);
+eventmask_t eventflag_get (struct eventflag *ev);
--- a/example-cdc-gnu-linux/Makefile
+++ b/example-cdc-gnu-linux/Makefile
@@ -0,0 +1,36 @@
+# Makefile for example application of Chopstx
+
+PROJECT = sample
+
+### This is for GNU/Linux
+
+CHOPSTX = ..
+LDSCRIPT=
+CSRC = sample.c usb-cdc.c
+
+CHIP=gnu-linux
+# USE_SYS = yes
+USE_SYS =
+USE_USB = yes
+EMULATION=yes
+
+###################################
+CROSS =
+CC   = $(CROSS)gcc
+LD   = $(CROSS)gcc
+OBJCOPY   = $(CROSS)objcopy
+
+MCU   = none
+CWARN = -Wall -Wextra -Wstrict-prototypes
+DEFS  = -DGNU_LINUX_EMULATION
+OPT   = -g # -O3 -Os
+LIBS  = -lpthread
+
+####################
+include ../rules.mk
+
+board.h:
+	@echo Please make a symbolic link \'board.h\' to a file in ../board;
+	@exit 1
+
+distclean: clean
--- a/example-cdc-gnu-linux/README
+++ b/example-cdc-gnu-linux/README
@@ -0,0 +1,35 @@
+(1) preparation as root 
+
+Don't run ModemManager
+
+# systemctl stop ModemManager
+
+Install USBIP host module
+# modprobe vhci_hcd
+
+
+(2) Run sample program of USBIP server
+
+$ ./sample
+
+
+(3) Use the USB device as root
+
+Attach the Chopstx application program (USBIP device) to USBIP host.
+
+# usbip attach -r 127.0.0.1 -b 1-1
+
+
+(4) Connect CDC-ACM device
+
+$ cu -l /dev/ttyACM0
+
+Then, you see the message from Chopstx.  As you type lines, it echos.
+
+Type RET, ~ then . , you can terminate the session.
+
+
+(5) Detach the USBIP device as root
+
+# usbip detach -p 0
+
--- a/example-cdc-gnu-linux/board.h
+++ b/example-cdc-gnu-linux/board.h
@@ -0,0 +1 @@
+../board/board-gnu-linux.h
--- a/example-cdc-gnu-linux/sample.c
+++ b/example-cdc-gnu-linux/sample.c
@@ -0,0 +1,197 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ucontext.h>
+
+#include <chopstx.h>
+
+#include "usb_lld.h"
+#include "tty.h"
+
+#include <unistd.h>
+#include <stdio.h>
+
+static void
+set_led (int on)
+{
+#if 0
+  /* For debugging, no output of LED.  */
+#if 1
+  if (on)
+    write (1, "********\x08\x08\x08\x08\x08\x08\x08\x08", 16);
+  else
+    write (1, "        \x08\x08\x08\x08\x08\x08\x08\x08", 16);
+#else
+  if (on)
+    puts ("!");
+  else
+    puts ("");
+#endif
+#else
+  (void)on;
+#endif
+}
+
+static chopstx_mutex_t mtx;
+static chopstx_cond_t cnd0;
+static chopstx_cond_t cnd1;
+
+static uint8_t u, v;
+static uint8_t m;		/* 0..100 */
+
+static void *
+pwm (void *arg)
+{
+  (void)arg;
+
+  chopstx_mutex_lock (&mtx);
+  chopstx_cond_wait (&cnd0, &mtx);
+  chopstx_mutex_unlock (&mtx);
+
+  while (1)
+    {
+      set_led (u&v);
+      chopstx_usec_wait (m);
+      set_led (0);
+      chopstx_usec_wait (100-m);
+    }
+
+  return NULL;
+}
+
+static void *
+blk (void *arg)
+{
+  (void)arg;
+
+  chopstx_mutex_lock (&mtx);
+  chopstx_cond_wait (&cnd1, &mtx);
+  chopstx_mutex_unlock (&mtx);
+
+  while (1)
+    {
+      v = 0;
+      chopstx_usec_wait (200*1000);
+      v = 1;
+      chopstx_usec_wait (200*1000);
+    }
+
+  return NULL;
+}
+
+
+#define PRIO_PWM 3
+#define PRIO_BLK 2
+
+static char __process1_stack_base__[4096];
+static char __process2_stack_base__[4096];
+
+#define STACK_ADDR_PWM ((uintptr_t)__process1_stack_base__)
+#define STACK_SIZE_PWM (sizeof __process1_stack_base__)
+
+#define STACK_ADDR_BLK ((uintptr_t)__process2_stack_base__)
+#define STACK_SIZE_BLK (sizeof __process2_stack_base__)
+
+
+static char hexchar (uint8_t x)
+{
+  x &= 0x0f;
+  if (x <= 0x09)
+    return '0' + x;
+  else if (x <= 0x0f)
+    return 'a' + x - 10;
+  else
+    return '?';
+}
+
+
+#ifdef GNU_LINUX_EMULATION
+#define main emulated_main
+#endif
+
+int
+main (int argc, const char *argv[])
+{
+  struct tty *tty;
+  uint8_t count;
+
+  (void)argc;
+  (void)argv;
+
+  chopstx_mutex_init (&mtx);
+  chopstx_cond_init (&cnd0);
+  chopstx_cond_init (&cnd1);
+
+  m = 10;
+
+  chopstx_create (PRIO_PWM, STACK_ADDR_PWM, STACK_SIZE_PWM, pwm, NULL);
+  chopstx_create (PRIO_BLK, STACK_ADDR_BLK, STACK_SIZE_BLK, blk, NULL);
+
+  chopstx_usec_wait (200*1000);
+
+  chopstx_mutex_lock (&mtx);
+  chopstx_cond_signal (&cnd0);
+  chopstx_cond_signal (&cnd1);
+  chopstx_mutex_unlock (&mtx);
+
+  u = 1;
+
+  tty = tty_open ();
+  tty_wait_configured (tty);
+
+  count = 0;
+  m = 50;
+  while (1)
+    {
+      char s[LINEBUFSIZE];
+
+      u = 1;
+      tty_wait_connection (tty);
+
+      chopstx_usec_wait (50*1000);
+
+      puts("send ZLP");
+      /* Send ZLP at the beginning.  */
+      tty_send (tty, s, 0);
+
+      memcpy (s, "xx: Hello, World with Chopstx!\r\n", 32);
+      s[0] = hexchar (count >> 4);
+      s[1] = hexchar (count & 0x0f);
+      count++;
+
+      puts("send hello");
+      if (tty_send (tty, s, 32) < 0)
+	continue;
+
+      while (1)
+	{
+	  int size;
+	  uint32_t usec;
+
+	  puts("recv msg");
+	  usec = 3000000;	/* 3.0 seconds */
+	  size = tty_recv (tty, s + 4, &usec);
+	  if (size < 0)
+	    break;
+
+	  if (size)
+	    {
+	      size--;
+
+	      puts("send msg");
+	      s[0] = hexchar (size >> 4);
+	      s[1] = hexchar (size & 0x0f);
+	      s[2] = ':';
+	      s[3] = ' ';
+	      s[size + 4] = '\r';
+	      s[size + 5] = '\n';
+	      if (tty_send (tty, s, size + 6) < 0)
+		break;
+	    }
+
+	  u ^= 1;
+	}
+    }
+
+  return 0;
+}
--- a/example-cdc-gnu-linux/tty.h
+++ b/example-cdc-gnu-linux/tty.h
@@ -0,0 +1,9 @@
+#define LINEBUFSIZE 128
+
+struct tty;
+
+struct tty *tty_open (void);
+void tty_wait_configured (struct tty *tty);
+void tty_wait_connection (struct tty *tty);
+int tty_send (struct tty *tty, const char *buf, int count);
+int tty_recv (struct tty *tty, char *buf, uint32_t *timeout);
--- a/example-cdc-gnu-linux/usb-cdc.c
+++ b/example-cdc-gnu-linux/usb-cdc.c
@@ -0,0 +1,953 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <chopstx.h>
+#include <string.h>
+#include "usb_lld.h"
+#include "tty.h"
+
+static chopstx_intr_t usb_intr;
+
+struct line_coding
+{
+  uint32_t bitrate;
+  uint8_t format;
+  uint8_t paritytype;
+  uint8_t datatype;
+}  __attribute__((packed));
+
+static const struct line_coding line_coding0 = {
+  115200, /* baud rate: 115200    */
+  0x00,   /* stop bits: 1         */
+  0x00,   /* parity:    none      */
+  0x08    /* bits:      8         */
+};
+
+/*
+ * Currently, we only support a single TTY.
+ *
+ * It is possible to extend to support multiple TTYs, for multiple
+ * interfaces.
+ *
+ * In that case, add argument to TTY_OPEN function and
+ * modify TTY_GET function to get the TTY structure.  Functions which
+ * directy accesses TTY0 (usb_device_reset and usb_set_configuration)
+ * should be modified, too.
+ *
+ * Modification of TTY_MAIN thread will be also needed to echo back
+ * input for each TTY, and the thread should run if one of TTY is
+ * opened.
+ */
+
+struct tty {
+  chopstx_mutex_t mtx;
+  chopstx_cond_t cnd;
+  uint8_t inputline[LINEBUFSIZE];   /* Line editing is supported */
+  uint8_t send_buf[LINEBUFSIZE];    /* Sending ring buffer for echo back */
+  uint8_t send_buf0[64];
+  uint8_t recv_buf0[64];
+  uint32_t inputline_len    : 8;
+  uint32_t send_head        : 8;
+  uint32_t send_tail        : 8;
+  uint32_t flag_connected   : 1;
+  uint32_t flag_send_ready  : 1;
+  uint32_t flag_input_avail : 1;
+  uint32_t                  : 2;
+  uint32_t device_state     : 3;     /* USB device status */
+  struct line_coding line_coding;
+};
+
+static struct tty tty0;
+
+/*
+ * Locate TTY structure from interface number or endpoint number.
+ * Currently, it always returns tty0, because we only have the one.
+ */
+static struct tty *
+tty_get (int interface, uint8_t ep_num)
+{
+  struct tty *t = &tty0;
+
+  if (interface >= 0)
+    {
+      if (interface == 0)
+	t = &tty0;
+    }
+  else
+    {
+      if (ep_num == ENDP1 || ep_num == ENDP2 || ep_num == ENDP3)
+	t = &tty0;
+    }
+
+  return t;
+}
+
+
+#define USB_CDC_REQ_SET_LINE_CODING             0x20
+#define USB_CDC_REQ_GET_LINE_CODING             0x21
+#define USB_CDC_REQ_SET_CONTROL_LINE_STATE      0x22
+#define USB_CDC_REQ_SEND_BREAK                  0x23
+
+/* USB Device Descriptor */
+static const uint8_t vcom_device_desc[18] = {
+  18,   /* bLength */
+  DEVICE_DESCRIPTOR,		/* bDescriptorType */
+  0x10, 0x01,			/* bcdUSB = 1.1 */
+  0x02,				/* bDeviceClass (CDC).              */
+  0x00,				/* bDeviceSubClass.                 */
+  0x00,				/* bDeviceProtocol.                 */
+  0x40,				/* bMaxPacketSize.                  */
+  0xFF, 0xFF, /* idVendor  */
+  0x01, 0x00, /* idProduct */
+  0x00, 0x01, /* bcdDevice  */
+  1,				/* iManufacturer.                   */
+  2,				/* iProduct.                        */
+  3,				/* iSerialNumber.                   */
+  1				/* bNumConfigurations.              */
+};
+
+#define VCOM_FEATURE_BUS_POWERED	0x80
+
+/* Configuration Descriptor tree for a CDC.*/
+static const uint8_t vcom_config_desc[67] = {
+  9,
+  CONFIG_DESCRIPTOR,		/* bDescriptorType: Configuration */
+  /* Configuration Descriptor.*/
+  67, 0x00,			/* wTotalLength.                    */
+  0x02,				/* bNumInterfaces.                  */
+  0x01,				/* bConfigurationValue.             */
+  0,				/* iConfiguration.                  */
+  VCOM_FEATURE_BUS_POWERED,	/* bmAttributes.                    */
+  50,				/* bMaxPower (100mA).               */
+  /* Interface Descriptor.*/
+  9,
+  INTERFACE_DESCRIPTOR,
+  0x00,		   /* bInterfaceNumber.                */
+  0x00,		   /* bAlternateSetting.               */
+  0x01,		   /* bNumEndpoints.                   */
+  0x02,		   /* bInterfaceClass (Communications Interface Class,
+		      CDC section 4.2).  */
+  0x02,		   /* bInterfaceSubClass (Abstract Control Model, CDC
+		      section 4.3).  */
+  0x01,		   /* bInterfaceProtocol (AT commands, CDC section
+		      4.4).  */
+  0,	           /* iInterface.                      */
+  /* Header Functional Descriptor (CDC section 5.2.3).*/
+  5,	      /* bLength.                         */
+  0x24,	      /* bDescriptorType (CS_INTERFACE).  */
+  0x00,	      /* bDescriptorSubtype (Header Functional Descriptor). */
+  0x10, 0x01, /* bcdCDC.                          */
+  /* Call Management Functional Descriptor. */
+  5,            /* bFunctionLength.                 */
+  0x24,         /* bDescriptorType (CS_INTERFACE).  */
+  0x01,         /* bDescriptorSubtype (Call Management Functional
+		   Descriptor). */
+  0x03,         /* bmCapabilities (D0+D1).          */
+  0x01,         /* bDataInterface.                  */
+  /* ACM Functional Descriptor.*/
+  4,            /* bFunctionLength.                 */
+  0x24,         /* bDescriptorType (CS_INTERFACE).  */
+  0x02,         /* bDescriptorSubtype (Abstract Control Management
+		   Descriptor).  */
+  0x02,         /* bmCapabilities.                  */
+  /* Union Functional Descriptor.*/
+  5,            /* bFunctionLength.                 */
+  0x24,         /* bDescriptorType (CS_INTERFACE).  */
+  0x06,         /* bDescriptorSubtype (Union Functional
+		   Descriptor).  */
+  0x00,         /* bMasterInterface (Communication Class
+		   Interface).  */
+  0x01,         /* bSlaveInterface0 (Data Class Interface).  */
+  /* Endpoint 2 Descriptor.*/
+  7,
+  ENDPOINT_DESCRIPTOR,
+  ENDP2|0x80,    /* bEndpointAddress.    */
+  0x03,          /* bmAttributes (Interrupt).        */
+  0x08, 0x00,	 /* wMaxPacketSize.                  */
+  0xFF,		 /* bInterval.                       */
+  /* Interface Descriptor.*/
+  9,
+  INTERFACE_DESCRIPTOR, /* bDescriptorType: */
+  0x01,          /* bInterfaceNumber.                */
+  0x00,          /* bAlternateSetting.               */
+  0x02,          /* bNumEndpoints.                   */
+  0x0A,          /* bInterfaceClass (Data Class Interface, CDC section 4.5). */
+  0x00,          /* bInterfaceSubClass (CDC section 4.6). */
+  0x00,          /* bInterfaceProtocol (CDC section 4.7). */
+  0x00,		 /* iInterface.                      */
+  /* Endpoint 3 Descriptor.*/
+  7,
+  ENDPOINT_DESCRIPTOR,		/* bDescriptorType: Endpoint */
+  ENDP3,    /* bEndpointAddress. */
+  0x02,				/* bmAttributes (Bulk).             */
+  0x40, 0x00,			/* wMaxPacketSize.                  */
+  0x00,				/* bInterval.                       */
+  /* Endpoint 1 Descriptor.*/
+  7,
+  ENDPOINT_DESCRIPTOR,		/* bDescriptorType: Endpoint */
+  ENDP1|0x80,			/* bEndpointAddress. */
+  0x02,				/* bmAttributes (Bulk).             */
+  0x40, 0x00,			/* wMaxPacketSize.                  */
+  0x00				/* bInterval.                       */
+};
+
+
+/*
+ * U.S. English language identifier.
+ */
+static const uint8_t vcom_string0[4] = {
+  4,				/* bLength */
+  STRING_DESCRIPTOR,
+  0x09, 0x04			/* LangID = 0x0409: US-English */
+};
+
+static const uint8_t vcom_string1[] = {
+  23*2+2,			/* bLength */
+  STRING_DESCRIPTOR,		/* bDescriptorType */
+  /* Manufacturer: "Flying Stone Technology" */
+  'F', 0, 'l', 0, 'y', 0, 'i', 0, 'n', 0, 'g', 0, ' ', 0, 'S', 0,
+  't', 0, 'o', 0, 'n', 0, 'e', 0, ' ', 0, 'T', 0, 'e', 0, 'c', 0,
+  'h', 0, 'n', 0, 'o', 0, 'l', 0, 'o', 0, 'g', 0, 'y', 0, 
+};
+
+static const uint8_t vcom_string2[] = {
+  14*2+2,			/* bLength */
+  STRING_DESCRIPTOR,		/* bDescriptorType */
+  /* Product name: "Chopstx Sample" */
+  'C', 0, 'h', 0, 'o', 0, 'p', 0, 's', 0, 't', 0, 'x', 0, ' ', 0,
+  'S', 0, 'a', 0, 'm', 0, 'p', 0, 'l', 0, 'e', 0,
+};
+
+/*
+ * Serial Number string.
+ */
+static const uint8_t vcom_string3[28] = {
+  28,				    /* bLength */
+  STRING_DESCRIPTOR,		    /* bDescriptorType */
+  '0', 0,  '.', 0,  '0', 0, '0', 0, /* Version number */
+};
+
+
+#define NUM_INTERFACES 2
+
+
+static void
+usb_device_reset (struct usb_dev *dev)
+{
+  usb_lld_reset (dev, VCOM_FEATURE_BUS_POWERED);
+
+  /* Initialize Endpoint 0 */
+  usb_lld_setup_endp (dev, ENDP0, 1, 1);
+
+  chopstx_mutex_lock (&tty0.mtx);
+  tty0.inputline_len = 0;
+  tty0.send_head = tty0.send_tail = 0;
+  tty0.flag_connected = 0;
+  tty0.flag_send_ready = 1;
+  tty0.flag_input_avail = 0;
+  tty0.device_state = ATTACHED;
+  memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
+  chopstx_mutex_unlock (&tty0.mtx);
+}
+
+
+#define CDC_CTRL_DTR            0x0001
+
+static void
+usb_ctrl_write_finish (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
+
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0
+      && USB_SETUP_SET (arg->type)
+      && arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
+    {
+      struct tty *t = tty_get (arg->index, 0);
+
+      /* Open/close the connection.  */
+      chopstx_mutex_lock (&t->mtx);
+      t->flag_connected = ((arg->value & CDC_CTRL_DTR) != 0);
+      chopstx_cond_signal (&t->cnd);
+      chopstx_mutex_unlock (&t->mtx);
+    }
+
+  /*
+   * The transaction was already finished.  So, it is no use to call
+   * usb_lld_ctrl_error when the condition does not match.
+   */
+}
+
+
+
+static int
+vcom_port_data_setup (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+
+  if (USB_SETUP_GET (arg->type))
+    {
+      struct tty *t = tty_get (arg->index, 0);
+
+      if (arg->request == USB_CDC_REQ_GET_LINE_CODING)
+	return usb_lld_ctrl_send (dev, &t->line_coding,
+				  sizeof (struct line_coding));
+    }
+  else  /* USB_SETUP_SET (req) */
+    {
+      if (arg->request == USB_CDC_REQ_SET_LINE_CODING
+	  && arg->len == sizeof (struct line_coding))
+	{
+	  struct tty *t = tty_get (arg->index, 0);
+
+	  return usb_lld_ctrl_recv (dev, &t->line_coding,
+				    sizeof (struct line_coding));
+	}
+      else if (arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
+	return usb_lld_ctrl_ack (dev);
+    }
+
+  return -1;
+}
+
+static int
+usb_setup (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
+
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0)
+    return vcom_port_data_setup (dev);
+
+  return -1;
+}
+
+static int
+usb_get_descriptor (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+  uint8_t desc_type = (arg->value >> 8);
+  uint8_t desc_index = (arg->value & 0xff);
+
+  if (rcp != DEVICE_RECIPIENT)
+    return -1;
+
+  if (desc_type == DEVICE_DESCRIPTOR)
+    return usb_lld_ctrl_send (dev,
+			      vcom_device_desc, sizeof (vcom_device_desc));
+  else if (desc_type == CONFIG_DESCRIPTOR)
+    return usb_lld_ctrl_send (dev,
+			      vcom_config_desc, sizeof (vcom_config_desc));
+  else if (desc_type == STRING_DESCRIPTOR)
+    {
+      const uint8_t *str;
+      int size;
+
+      switch (desc_index)
+	{
+	case 0:
+	  str = vcom_string0;
+	  size = sizeof (vcom_string0);
+	  break;
+	case 1:
+	  str = vcom_string1;
+	  size = sizeof (vcom_string1);
+	  break;
+	case 2:
+	  str = vcom_string2;
+	  size = sizeof (vcom_string2);
+	  break;
+	case 3:
+	  str = vcom_string3;
+	  size = sizeof (vcom_string3);
+	  break;
+	default:
+	  return -1;
+	}
+
+      return usb_lld_ctrl_send (dev, str, size);
+    }
+
+  return -1;
+}
+
+static void
+vcom_setup_endpoints_for_interface (struct usb_dev *dev,
+				    uint16_t interface, int stop)
+{
+  if (interface == 0)
+    {
+      if (!stop)
+	usb_lld_setup_endp (dev, ENDP2, 0, 1);
+      else
+	usb_lld_stall_tx (ENDP2);
+    }
+  else if (interface == 1)
+    {
+      if (!stop)
+	{
+	  usb_lld_setup_endp (dev, ENDP1, 0, 1);
+	  usb_lld_setup_endp (dev, ENDP3, 1, 0);
+	  /* Start with no data receiving (ENDP3 not enabled)*/
+	}
+      else
+	{
+	  usb_lld_stall_tx (ENDP1);
+	  usb_lld_stall_rx (ENDP3);
+	}
+    }
+}
+
+static int
+usb_set_configuration (struct usb_dev *dev)
+{
+  int i;
+  uint8_t current_conf;
+
+  current_conf = usb_lld_current_configuration (dev);
+  if (current_conf == 0)
+    {
+      if (dev->dev_req.value != 1)
+	return -1;
+
+      usb_lld_set_configuration (dev, 1);
+      for (i = 0; i < NUM_INTERFACES; i++)
+	vcom_setup_endpoints_for_interface (dev, i, 0);
+      chopstx_mutex_lock (&tty0.mtx);
+      tty0.device_state = CONFIGURED;
+      chopstx_cond_signal (&tty0.cnd);
+      chopstx_mutex_unlock (&tty0.mtx);
+    }
+  else if (current_conf != dev->dev_req.value)
+    {
+      if (dev->dev_req.value != 0)
+	return -1;
+
+      usb_lld_set_configuration (dev, 0);
+      for (i = 0; i < NUM_INTERFACES; i++)
+	vcom_setup_endpoints_for_interface (dev, i, 1);
+      chopstx_mutex_lock (&tty0.mtx);
+      tty0.device_state = ADDRESSED;
+      chopstx_cond_signal (&tty0.cnd);
+      chopstx_mutex_unlock (&tty0.mtx);
+    }
+
+  return usb_lld_ctrl_ack (dev);
+}
+
+
+static int
+usb_set_interface (struct usb_dev *dev)
+{
+  uint16_t interface = dev->dev_req.index;
+  uint16_t alt = dev->dev_req.value;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  if (alt != 0)
+    return -1;
+  else
+    {
+      vcom_setup_endpoints_for_interface (dev, interface, 0);
+      return usb_lld_ctrl_ack (dev);
+    }
+}
+
+static int
+usb_get_interface (struct usb_dev *dev)
+{
+  const uint8_t zero = 0;
+  uint16_t interface = dev->dev_req.index;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  /* We don't have alternate interface, so, always return 0.  */
+  return usb_lld_ctrl_send (dev, &zero, 1);
+}
+
+static int
+usb_get_status_interface (struct usb_dev *dev)
+{
+  const uint16_t status_info = 0;
+  uint16_t interface = dev->dev_req.index;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  return usb_lld_ctrl_send (dev, &status_info, 2);
+}
+
+
+/*
+ * Put a character into the ring buffer to be send back.
+ */
+static void
+put_char_to_ringbuffer (struct tty *t, int c)
+{
+  uint32_t next = (t->send_tail + 1) % LINEBUFSIZE;
+
+  if (t->send_head == next)
+    /* full */
+    /* All that we can do is ignore this char. */
+    return;
+  
+  t->send_buf[t->send_tail] = c;
+  t->send_tail = next;
+}
+
+/*
+ * Get characters from ring buffer into S.
+ */
+static int
+get_chars_from_ringbuffer (struct tty *t, uint8_t *s, int len)
+{
+  int i = 0;
+
+  if (t->send_head == t->send_tail)
+    /* Empty */
+    return i;
+
+  do
+    {
+      s[i++] = t->send_buf[t->send_head];
+      t->send_head = (t->send_head + 1) % LINEBUFSIZE;
+    }
+  while (t->send_head != t->send_tail && i < len);
+
+  return i;
+}
+
+
+static void
+tty_echo_char (struct tty *t, int c)
+{
+  put_char_to_ringbuffer (t, c);
+}
+
+static void
+usb_tx_done (uint8_t ep_num, uint16_t len)
+{
+  struct tty *t = tty_get (-1, ep_num);
+
+  (void)len;
+  if (ep_num == ENDP1)
+    {
+      chopstx_mutex_lock (&t->mtx);
+      if (t->flag_send_ready == 0)
+	{
+	  t->flag_send_ready = 1;
+	  chopstx_cond_signal (&t->cnd);
+	}
+      chopstx_mutex_unlock (&t->mtx);
+    }
+  else if (ep_num == ENDP2)
+    {
+      /* Nothing */
+    }
+}
+
+
+static int
+tty_input_char (struct tty *t, int c)
+{
+  unsigned int i;
+  int r = 0;
+
+  /* Process DEL, C-U, C-R, and RET as editing command. */
+  chopstx_mutex_lock (&t->mtx);
+  switch (c)
+    {
+    case 0x0d: /* Control-M */
+      t->inputline[t->inputline_len++] = '\n';
+      tty_echo_char (t, 0x0d);
+      tty_echo_char (t, 0x0a);
+      t->flag_input_avail = 1;
+      r = 1;
+      chopstx_cond_signal (&t->cnd);
+      break;
+    case 0x12: /* Control-R */
+      tty_echo_char (t, '^');
+      tty_echo_char (t, 'R');
+      tty_echo_char (t, 0x0d);
+      tty_echo_char (t, 0x0a);
+      for (i = 0; i < t->inputline_len; i++)
+	tty_echo_char (t, t->inputline[i]);
+      break;
+    case 0x15: /* Control-U */
+      for (i = 0; i < t->inputline_len; i++)
+	{
+	  tty_echo_char (t, 0x08);
+	  tty_echo_char (t, 0x20);
+	  tty_echo_char (t, 0x08);
+	}
+      t->inputline_len = 0;
+      break;
+    case 0x7f: /* DEL    */
+      if (t->inputline_len > 0)
+	{
+	  tty_echo_char (t, 0x08);
+	  tty_echo_char (t, 0x20);
+	  tty_echo_char (t, 0x08);
+	  t->inputline_len--;
+	}
+      break;
+    default:
+      if (t->inputline_len < sizeof (t->inputline) - 1)
+	{
+	  tty_echo_char (t, c);
+	  t->inputline[t->inputline_len++] = c;
+	}
+      else
+	/* Beep */
+	tty_echo_char (t, 0x0a);
+      break;
+    }
+  chopstx_mutex_unlock (&t->mtx);
+  return r;
+}
+
+static void
+usb_rx_ready (uint8_t ep_num, uint16_t len)
+{
+  struct tty *t = tty_get (-1, ep_num);
+  if (ep_num == ENDP3)
+    {
+      int i;
+
+      for (i = 0; i < len; i++)
+	if (tty_input_char (t, t->recv_buf0[i]))
+	  break;
+
+      chopstx_mutex_lock (&t->mtx);
+      if (t->flag_input_avail == 0)
+	usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64);
+      chopstx_mutex_unlock (&t->mtx);
+    }
+}
+
+static void *tty_main (void *arg);
+
+#include <signal.h>
+#define INTR_REQ_USB SIGUSR1
+#define PRIO_TTY      4
+
+static char __process3_stack_base__[4096];
+#define STACK_ADDR_TTY ((uintptr_t)__process3_stack_base__)
+#define STACK_SIZE_TTY (sizeof __process3_stack_base__)
+
+struct tty *
+tty_open (void)
+{
+  chopstx_mutex_init (&tty0.mtx);
+  chopstx_cond_init (&tty0.cnd);
+  tty0.inputline_len = 0;
+  tty0.send_head = tty0.send_tail = 0;
+  tty0.flag_connected = 0;
+  tty0.flag_send_ready = 1;
+  tty0.flag_input_avail = 0;
+  tty0.device_state = UNCONNECTED;
+  memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
+
+  chopstx_create (PRIO_TTY, STACK_ADDR_TTY, STACK_SIZE_TTY, tty_main, &tty0);
+  return &tty0;
+}
+
+
+static void *
+tty_main (void *arg)
+{
+  struct tty *t = arg;
+  struct usb_dev dev;
+  int e;
+
+#if defined(OLDER_SYS_H)
+  /*
+   * Historically (before sys < 3.0), NVIC priority setting for USB
+   * interrupt was done in usb_lld_sys_init.  Thus this code.
+   *
+   * When USB interrupt occurs between usb_lld_init (which assumes
+   * ISR) and chopstx_claim_irq (which clears pending interrupt),
+   * invocation of usb_lld_event_handler won't occur.
+   *
+   * Calling usb_lld_event_handler is no harm even if there were no
+   * interrupts, thus, we call it unconditionally here, just in case
+   * if there is a request.
+   *
+   * We can't call usb_lld_init after chopstx_claim_irq, as
+   * usb_lld_init does its own setting for NVIC.  Calling
+   * chopstx_claim_irq after usb_lld_init overrides that.
+   *
+   */
+  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
+  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
+  goto event_handle;
+#else
+  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
+  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
+#endif
+
+  while (1)
+    {
+      chopstx_intr_wait (&usb_intr);
+      if (usb_intr.ready)
+	{
+	  uint8_t ep_num;
+#if defined(OLDER_SYS_H)
+	event_handle:
+#endif
+	  /*
+	   * When interrupt is detected, call usb_lld_event_handler.
+	   * The event may be one of following:
+	   *    (1) Transfer to endpoint (bulk or interrupt)
+	   *        In this case EP_NUM is encoded in the variable E.
+	   *    (2) "NONE" event: some trasfer was done, but all was
+	   *        done by lower layer, no other work is needed in
+	   *        upper layer.
+	   *    (3) Device events: Reset or Suspend
+	   *    (4) Device requests to the endpoint zero.
+	   *        
+	   */
+	  e = usb_lld_event_handler (&dev);
+	  ep_num = USB_EVENT_ENDP (e);
+
+	  if (ep_num != 0)
+	    {
+	      if (USB_EVENT_TXRX (e))
+		usb_tx_done (ep_num, USB_EVENT_LEN (e));
+	      else
+		usb_rx_ready (ep_num, USB_EVENT_LEN (e));
+	    }
+	  else
+	    switch (USB_EVENT_ID (e))
+	      {
+	      case USB_EVENT_DEVICE_RESET:
+		usb_device_reset (&dev);
+		continue;
+
+	      case USB_EVENT_DEVICE_ADDRESSED:
+		/* The addres is assigned to the device.  We don't
+		 * need to do anything for this actually, but in this
+		 * application, we maintain the USB status of the
+		 * device.  Usually, just "continue" as EVENT_OK is
+		 * OK.
+		 */
+		chopstx_mutex_lock (&tty0.mtx);
+		tty0.device_state = ADDRESSED;
+		chopstx_cond_signal (&tty0.cnd);
+		chopstx_mutex_unlock (&tty0.mtx);
+		continue;
+
+	      case USB_EVENT_GET_DESCRIPTOR:
+		if (usb_get_descriptor (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_CONFIGURATION:
+		if (usb_set_configuration (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_INTERFACE:
+		if (usb_set_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_REQUEST:
+		/* Device specific device request.  */
+		if (usb_setup (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_STATUS_INTERFACE:
+		if (usb_get_status_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_INTERFACE:
+		if (usb_get_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_FEATURE_DEVICE:
+	      case USB_EVENT_SET_FEATURE_ENDPOINT:
+	      case USB_EVENT_CLEAR_FEATURE_DEVICE:
+	      case USB_EVENT_CLEAR_FEATURE_ENDPOINT:
+		usb_lld_ctrl_ack (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_WRITE_FINISH:
+		/* Control WRITE transfer finished.  */
+		usb_ctrl_write_finish (&dev);
+		continue;
+
+	      case USB_EVENT_OK:
+	      case USB_EVENT_DEVICE_SUSPEND:
+	      default:
+		continue;
+	      }
+	}
+
+      chopstx_mutex_lock (&t->mtx);
+      if (t->device_state == CONFIGURED && t->flag_connected
+	  && t->flag_send_ready)
+	{
+	  uint8_t line[32];
+	  int len = get_chars_from_ringbuffer (t, line, sizeof (len));
+
+	  if (len)
+	    {
+	      memcpy (t->send_buf0, line, len);
+	      usb_lld_tx_enable_buf (ENDP1, t->send_buf0, len);
+	      t->flag_send_ready = 0;
+	    }
+	}
+      chopstx_mutex_unlock (&t->mtx);
+    }
+
+  return NULL;
+}
+
+
+void
+tty_wait_configured (struct tty *t)
+{
+  chopstx_mutex_lock (&t->mtx);
+  while (t->device_state != CONFIGURED)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  chopstx_mutex_unlock (&t->mtx);
+}
+
+
+void
+tty_wait_connection (struct tty *t)
+{
+  chopstx_mutex_lock (&t->mtx);
+  while (t->flag_connected == 0)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  t->flag_send_ready = 1;
+  t->flag_input_avail = 0;
+  t->send_head = t->send_tail = 0;
+  t->inputline_len = 0;
+  usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64); /* Accept input for line */
+  chopstx_mutex_unlock (&t->mtx);
+}
+
+static int
+check_tx (struct tty *t)
+{
+  if (t->flag_send_ready)
+    /* TX done */
+    return 1;
+  if (t->flag_connected == 0)
+    /* Disconnected */
+    return -1;
+  return 0;
+}
+
+int
+tty_send (struct tty *t, const char *buf, int len)
+{
+  int r;
+  const char *p;
+  int count;
+
+  p = buf;
+  count = len >= 64 ? 64 : len;
+
+  while (1)
+    {
+      chopstx_mutex_lock (&t->mtx);
+      while ((r = check_tx (t)) == 0)
+	chopstx_cond_wait (&t->cnd, &t->mtx);
+      if (r > 0)
+	{
+	  usb_lld_tx_enable_buf (ENDP1, p, count);
+	  t->flag_send_ready = 0;
+	}
+      chopstx_mutex_unlock (&t->mtx);
+
+      len -= count;
+      p += count;
+      if (len == 0 && count != 64)
+	/*
+	 * The size of the last packet should be != 0
+	 * If 64, send ZLP (zelo length packet)
+	 */
+	break;
+      count = len >= 64 ? 64 : len;
+    }
+
+  /* Wait until all sent. */
+  chopstx_mutex_lock (&t->mtx);
+  while ((r = check_tx (t)) == 0)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  chopstx_mutex_unlock (&t->mtx);
+  return r;
+}
+
+
+static int
+check_rx (void *arg)
+{
+  struct tty *t = arg;
+
+  if (t->flag_input_avail)
+    /* RX */
+    return 1;
+  if (t->flag_connected == 0)
+    /* Disconnected */
+    return 1;
+  return 0;
+}
+
+/*
+ * Returns -1 on connection close
+ *          0 on timeout.
+ *          >0 length of the inputline (including final \n) 
+ *
+ */
+int
+tty_recv (struct tty *t, char *buf, uint32_t *timeout)
+{
+  int r;
+  chopstx_poll_cond_t poll_desc;
+
+  poll_desc.type = CHOPSTX_POLL_COND;
+  poll_desc.ready = 0;
+  poll_desc.cond = &t->cnd;
+  poll_desc.mutex = &t->mtx;
+  poll_desc.check = check_rx;
+  poll_desc.arg = t;
+
+  while (1)
+    {
+      struct chx_poll_head *pd_array[1] = {
+	(struct chx_poll_head *)&poll_desc
+      };
+      chopstx_poll (timeout, 1, pd_array);
+      chopstx_mutex_lock (&t->mtx);
+      r = check_rx (t);
+      chopstx_mutex_unlock (&t->mtx);
+      if (r || (timeout != NULL && *timeout == 0))
+	break;
+    }
+
+  chopstx_mutex_lock (&t->mtx);
+  if (t->flag_connected == 0)
+    r = -1;
+  else if (t->flag_input_avail)
+    {
+      r = t->inputline_len;
+      memcpy (buf, t->inputline, r);
+      t->flag_input_avail = 0;
+      usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64);
+      t->inputline_len = 0;
+    }
+  else
+    r = 0;
+  chopstx_mutex_unlock (&t->mtx);
+
+  return r;
+}
--- a/example-cdc/Makefile
+++ b/example-cdc/Makefile
@@ -4,7 +4,12 @@ PROJECT = sample

 CHOPSTX = ..
 LDSCRIPT= sample.ld
-CSRC = sys.c aes-constant-ft.c sample.c usb-cdc.c usb_stm32f103.c
+CSRC = sample.c usb-cdc.c
+
+CHIP=stm32f103
+
+USE_SYS = yes
+USE_USB = yes

 ###################################
 CROSS = arm-none-eabi-
@@ -14,7 +19,7 @@ OBJCOPY   = $(CROSS)objcopy

 MCU   = cortex-m3
 CWARN = -Wall -Wextra -Wstrict-prototypes
-DEFS  = -DHAVE_SYS_H -DFREE_STANDING
+DEFS  = -DUSE_SYS3 -DFREE_STANDING
 OPT   = -O3 -Os -g
 LIBS  =

--- a/example-cdc/aes-constant-ft.c
+++ b/example-cdc/aes-constant-ft.c
@@ -1,145 +0,0 @@
-/*
- * aes-constant-ft.c - AES forward tables.
- *
- * We need something useful for the initial flash ROM page (4 Ki
- * bytes), which cannot be modified after installation.  Even after
- * upgrade of the firmware, it stays intact.
- *
- * We decide to put 3/4 of AES forward tables to fill 3 Ki bytes, as
- * its useful and it won't change.
- *
- * The code was taken from aes.c of PolarSSL version 0.14, and then,
- * modified to add section names.
- *
- * Since this is just a data, it wouldn't be copyright-able, but the
- * original auther would claim so.  Thus, we put original copyright
- * notice here.  It is highly likely that there will be no such a
- * thing for copyright.  Nevertheless, we think that PolarSSL is good
- * software to address here, and encourage people using it.
- *
- */
-
-#include <stdint.h>
-
-/*
- * Original copyright notice is below:
- */
-
-/*
- *  FIPS-197 compliant AES implementation
- *
- *  Copyright (C) 2006-2010, Brainspark B.V.
- *
- *  This file is part of PolarSSL (http://www.polarssl.org)
- *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
- *
- *  All rights reserved.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-/*
- *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
- *
- *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
- *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
- */
-
-/*
- * Forward tables
- */
-#define FT \
-\
-    V(A5,63,63,C6), V(84,7C,7C,F8), V(99,77,77,EE), V(8D,7B,7B,F6), \
-    V(0D,F2,F2,FF), V(BD,6B,6B,D6), V(B1,6F,6F,DE), V(54,C5,C5,91), \
-    V(50,30,30,60), V(03,01,01,02), V(A9,67,67,CE), V(7D,2B,2B,56), \
-    V(19,FE,FE,E7), V(62,D7,D7,B5), V(E6,AB,AB,4D), V(9A,76,76,EC), \
-    V(45,CA,CA,8F), V(9D,82,82,1F), V(40,C9,C9,89), V(87,7D,7D,FA), \
-    V(15,FA,FA,EF), V(EB,59,59,B2), V(C9,47,47,8E), V(0B,F0,F0,FB), \
-    V(EC,AD,AD,41), V(67,D4,D4,B3), V(FD,A2,A2,5F), V(EA,AF,AF,45), \
-    V(BF,9C,9C,23), V(F7,A4,A4,53), V(96,72,72,E4), V(5B,C0,C0,9B), \
-    V(C2,B7,B7,75), V(1C,FD,FD,E1), V(AE,93,93,3D), V(6A,26,26,4C), \
-    V(5A,36,36,6C), V(41,3F,3F,7E), V(02,F7,F7,F5), V(4F,CC,CC,83), \
-    V(5C,34,34,68), V(F4,A5,A5,51), V(34,E5,E5,D1), V(08,F1,F1,F9), \
-    V(93,71,71,E2), V(73,D8,D8,AB), V(53,31,31,62), V(3F,15,15,2A), \
-    V(0C,04,04,08), V(52,C7,C7,95), V(65,23,23,46), V(5E,C3,C3,9D), \
-    V(28,18,18,30), V(A1,96,96,37), V(0F,05,05,0A), V(B5,9A,9A,2F), \
-    V(09,07,07,0E), V(36,12,12,24), V(9B,80,80,1B), V(3D,E2,E2,DF), \
-    V(26,EB,EB,CD), V(69,27,27,4E), V(CD,B2,B2,7F), V(9F,75,75,EA), \
-    V(1B,09,09,12), V(9E,83,83,1D), V(74,2C,2C,58), V(2E,1A,1A,34), \
-    V(2D,1B,1B,36), V(B2,6E,6E,DC), V(EE,5A,5A,B4), V(FB,A0,A0,5B), \
-    V(F6,52,52,A4), V(4D,3B,3B,76), V(61,D6,D6,B7), V(CE,B3,B3,7D), \
-    V(7B,29,29,52), V(3E,E3,E3,DD), V(71,2F,2F,5E), V(97,84,84,13), \
-    V(F5,53,53,A6), V(68,D1,D1,B9), V(00,00,00,00), V(2C,ED,ED,C1), \
-    V(60,20,20,40), V(1F,FC,FC,E3), V(C8,B1,B1,79), V(ED,5B,5B,B6), \
-    V(BE,6A,6A,D4), V(46,CB,CB,8D), V(D9,BE,BE,67), V(4B,39,39,72), \
-    V(DE,4A,4A,94), V(D4,4C,4C,98), V(E8,58,58,B0), V(4A,CF,CF,85), \
-    V(6B,D0,D0,BB), V(2A,EF,EF,C5), V(E5,AA,AA,4F), V(16,FB,FB,ED), \
-    V(C5,43,43,86), V(D7,4D,4D,9A), V(55,33,33,66), V(94,85,85,11), \
-    V(CF,45,45,8A), V(10,F9,F9,E9), V(06,02,02,04), V(81,7F,7F,FE), \
-    V(F0,50,50,A0), V(44,3C,3C,78), V(BA,9F,9F,25), V(E3,A8,A8,4B), \
-    V(F3,51,51,A2), V(FE,A3,A3,5D), V(C0,40,40,80), V(8A,8F,8F,05), \
-    V(AD,92,92,3F), V(BC,9D,9D,21), V(48,38,38,70), V(04,F5,F5,F1), \
-    V(DF,BC,BC,63), V(C1,B6,B6,77), V(75,DA,DA,AF), V(63,21,21,42), \
-    V(30,10,10,20), V(1A,FF,FF,E5), V(0E,F3,F3,FD), V(6D,D2,D2,BF), \
-    V(4C,CD,CD,81), V(14,0C,0C,18), V(35,13,13,26), V(2F,EC,EC,C3), \
-    V(E1,5F,5F,BE), V(A2,97,97,35), V(CC,44,44,88), V(39,17,17,2E), \
-    V(57,C4,C4,93), V(F2,A7,A7,55), V(82,7E,7E,FC), V(47,3D,3D,7A), \
-    V(AC,64,64,C8), V(E7,5D,5D,BA), V(2B,19,19,32), V(95,73,73,E6), \
-    V(A0,60,60,C0), V(98,81,81,19), V(D1,4F,4F,9E), V(7F,DC,DC,A3), \
-    V(66,22,22,44), V(7E,2A,2A,54), V(AB,90,90,3B), V(83,88,88,0B), \
-    V(CA,46,46,8C), V(29,EE,EE,C7), V(D3,B8,B8,6B), V(3C,14,14,28), \
-    V(79,DE,DE,A7), V(E2,5E,5E,BC), V(1D,0B,0B,16), V(76,DB,DB,AD), \
-    V(3B,E0,E0,DB), V(56,32,32,64), V(4E,3A,3A,74), V(1E,0A,0A,14), \
-    V(DB,49,49,92), V(0A,06,06,0C), V(6C,24,24,48), V(E4,5C,5C,B8), \
-    V(5D,C2,C2,9F), V(6E,D3,D3,BD), V(EF,AC,AC,43), V(A6,62,62,C4), \
-    V(A8,91,91,39), V(A4,95,95,31), V(37,E4,E4,D3), V(8B,79,79,F2), \
-    V(32,E7,E7,D5), V(43,C8,C8,8B), V(59,37,37,6E), V(B7,6D,6D,DA), \
-    V(8C,8D,8D,01), V(64,D5,D5,B1), V(D2,4E,4E,9C), V(E0,A9,A9,49), \
-    V(B4,6C,6C,D8), V(FA,56,56,AC), V(07,F4,F4,F3), V(25,EA,EA,CF), \
-    V(AF,65,65,CA), V(8E,7A,7A,F4), V(E9,AE,AE,47), V(18,08,08,10), \
-    V(D5,BA,BA,6F), V(88,78,78,F0), V(6F,25,25,4A), V(72,2E,2E,5C), \
-    V(24,1C,1C,38), V(F1,A6,A6,57), V(C7,B4,B4,73), V(51,C6,C6,97), \
-    V(23,E8,E8,CB), V(7C,DD,DD,A1), V(9C,74,74,E8), V(21,1F,1F,3E), \
-    V(DD,4B,4B,96), V(DC,BD,BD,61), V(86,8B,8B,0D), V(85,8A,8A,0F), \
-    V(90,70,70,E0), V(42,3E,3E,7C), V(C4,B5,B5,71), V(AA,66,66,CC), \
-    V(D8,48,48,90), V(05,03,03,06), V(01,F6,F6,F7), V(12,0E,0E,1C), \
-    V(A3,61,61,C2), V(5F,35,35,6A), V(F9,57,57,AE), V(D0,B9,B9,69), \
-    V(91,86,86,17), V(58,C1,C1,99), V(27,1D,1D,3A), V(B9,9E,9E,27), \
-    V(38,E1,E1,D9), V(13,F8,F8,EB), V(B3,98,98,2B), V(33,11,11,22), \
-    V(BB,69,69,D2), V(70,D9,D9,A9), V(89,8E,8E,07), V(A7,94,94,33), \
-    V(B6,9B,9B,2D), V(22,1E,1E,3C), V(92,87,87,15), V(20,E9,E9,C9), \
-    V(49,CE,CE,87), V(FF,55,55,AA), V(78,28,28,50), V(7A,DF,DF,A5), \
-    V(8F,8C,8C,03), V(F8,A1,A1,59), V(80,89,89,09), V(17,0D,0D,1A), \
-    V(DA,BF,BF,65), V(31,E6,E6,D7), V(C6,42,42,84), V(B8,68,68,D0), \
-    V(C3,41,41,82), V(B0,99,99,29), V(77,2D,2D,5A), V(11,0F,0F,1E), \
-    V(CB,B0,B0,7B), V(FC,54,54,A8), V(D6,BB,BB,6D), V(3A,16,16,2C)
-
-#define V(a,b,c,d) 0x##a##b##c##d
-const uint32_t FT0[256] __attribute__((section(".sys.0"))) = { FT };
-#undef V
-
-#define V(a,b,c,d) 0x##b##c##d##a
-const uint32_t FT1[256] __attribute__((section(".sys.1"))) = { FT };
-#undef V
-
-#define V(a,b,c,d) 0x##c##d##a##b
-const uint32_t FT2[256] __attribute__((section(".sys.2"))) = { FT };
-#undef V
-
-#ifdef ORIGINAL_IMPLEMENTATION 
-#define V(a,b,c,d) 0x##d##a##b##c
-const uint32_t FT3[256] = { FT };
-#undef V
-#endif
--- a/example-cdc/sample.c
+++ b/example-cdc/sample.c
@@ -2,16 +2,18 @@
 #include <stdlib.h>
 #include <string.h>
 #include <chopstx.h>
-#include "sys.h" /* for set_led */
-#include "usb_lld.h" /* for set_led */
+
+#include "usb_lld.h"
+#include "tty.h"
+
+/* For set_led */
+#include "board.h"
+#include "sys.h"

 static chopstx_mutex_t mtx;
 static chopstx_cond_t cnd0;
 static chopstx_cond_t cnd1;

-chopstx_mutex_t usb_mtx;
-chopstx_cond_t cnd_usb;
-
 static uint8_t u, v;
 static uint8_t m;		/* 0..100 */

@@ -55,67 +57,23 @@ blk (void *arg)
  return NULL;
 }

-#define INTR_REQ_USB 20
-
-static void *
-usb_intr (void *arg)
-{
-  extern void usb_lld_init (uint8_t feature);
-  extern void usb_interrupt_handler (void);
-
-  chopstx_intr_t interrupt;
-
-  (void)arg;
-  usb_lld_init (0x80);		/* Bus powered. */
-  chopstx_claim_irq (&interrupt, INTR_REQ_USB);
-
-  /*
-   * When USB interrupt occurs between usb_lld_init (which assumes
-   * ISR) and chopstx_claim_irq (which clears pending interrupt),
-   * invocation of usb_interrupt_handler won't occur.
-   *
-   * We can't call usb_lld_init after chopstx_claim_irq, as
-   * usb_lld_init does its own setting for NVIC.  Calling
-   * chopstx_claim_irq after usb_lld_init overrides that.
-   *
-   * Calling usb_interrupt_handler is no harm even if there were no
-   * interrupts, thus, we call it unconditionally here, just in case
-   * if there is a request.
-   *
-   */
-  usb_interrupt_handler ();
-
-  while (1)
-    {
-      chopstx_intr_wait (&interrupt);
-
-      /* Process interrupt. */
-      usb_interrupt_handler ();
-    }
-
-  chopstx_release_irq (&interrupt);
-  return NULL;
-}

 #define PRIO_PWM 3
 #define PRIO_BLK 2
-#define PRIO_INTR 4

-extern uint8_t __process1_stack_base__, __process1_stack_size__;
-extern uint8_t __process2_stack_base__, __process2_stack_size__;
-extern uint8_t __process3_stack_base__, __process3_stack_size__;
+extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
+extern uint8_t __process2_stack_base__[], __process2_stack_size__[];

-const uint32_t __stackaddr_pwm = (uint32_t)&__process1_stack_base__;
-const size_t __stacksize_pwm = (size_t)&__process1_stack_size__;
+#define STACK_ADDR_PWM ((uint32_t)__process1_stack_base__)
+#define STACK_SIZE_PWM ((uint32_t)__process1_stack_size__)

-const uint32_t __stackaddr_blk = (uint32_t)&__process2_stack_base__;
-const size_t __stacksize_blk = (size_t)&__process2_stack_size__;
+#define STACK_ADDR_BLK ((uint32_t)__process2_stack_base__)
+#define STACK_SIZE_BLK ((uint32_t)__process2_stack_size__)

-const uint32_t __stackaddr_intr = (uint32_t)&__process3_stack_base__;
-const size_t __stacksize_intr = (size_t)&__process3_stack_size__;

 static char hexchar (uint8_t x)
 {
+  x &= 0x0f;
  if (x <= 0x09)
    return '0' + x;
  else if (x <= 0x0f)
@@ -128,6 +86,7 @@ static char hexchar (uint8_t x)
 int
 main (int argc, const char *argv[])
 {
+  struct tty *tty;
  uint8_t count;

  (void)argc;
@@ -137,15 +96,10 @@ main (int argc, const char *argv[])
  chopstx_cond_init (&cnd0);
  chopstx_cond_init (&cnd1);

-  chopstx_mutex_init (&usb_mtx);
-  chopstx_cond_init (&cnd_usb);
-
  m = 10;

-  chopstx_create (PRIO_PWM, __stackaddr_pwm, __stacksize_pwm, pwm, NULL);
-  chopstx_create (PRIO_BLK, __stackaddr_blk, __stacksize_blk, blk, NULL);
-  chopstx_create (PRIO_INTR, __stackaddr_intr, __stacksize_intr,
-		  usb_intr, NULL);
+  chopstx_create (PRIO_PWM, STACK_ADDR_PWM, STACK_SIZE_PWM, pwm, NULL);
+  chopstx_create (PRIO_BLK, STACK_ADDR_BLK, STACK_SIZE_BLK, blk, NULL);

  chopstx_usec_wait (200*1000);

@@ -154,41 +108,59 @@ main (int argc, const char *argv[])
  chopstx_cond_signal (&cnd1);
  chopstx_mutex_unlock (&mtx);

-  while (1)
-    {
-      extern uint8_t connected;
-
-      count= 0;
  u = 1;
-      /* waiting USB connection */
-      chopstx_mutex_lock (&usb_mtx);
-      if (!connected)
-	chopstx_cond_wait (&cnd_usb, &usb_mtx);
-      chopstx_mutex_unlock (&usb_mtx);

+  tty = tty_open ();
+  tty_wait_configured (tty);
+
+  count = 0;
+  m = 50;
  while (1)
    {
-	  char s[32];
+      char s[LINEBUFSIZE];

-	  u ^= 1;
-	  chopstx_usec_wait (200*1000*6);
+      u = 1;
+      tty_wait_connection (tty);
+
+      chopstx_usec_wait (50*1000);
+
+      /* Send ZLP at the beginning.  */
+      tty_send (tty, s, 0);

      memcpy (s, "xx: Hello, World with Chopstx!\r\n", 32);
      s[0] = hexchar (count >> 4);
      s[1] = hexchar (count & 0x0f);
      count++;

-	  chopstx_mutex_lock (&usb_mtx);
-	  if (connected)
+      if (tty_send (tty, s, 32) < 0)
+	continue;
+
+      while (1)
 	{
-	      usb_lld_write (ENDP1, s, 32);
-	      chopstx_cond_wait (&cnd_usb, &usb_mtx);
-	    }
-	  else
+	  int size;
+	  uint32_t usec;
+
+	  usec = 3000000;	/* 3.0 seconds */
+	  size = tty_recv (tty, s + 4, &usec);
+	  if (size < 0)
+	    break;
+
+	  if (size)
+	    {
+	      size--;
+
+	      s[0] = hexchar (size >> 4);
+	      s[1] = hexchar (size & 0x0f);
+	      s[2] = ':';
+	      s[3] = ' ';
+	      s[size + 4] = '\r';
+	      s[size + 5] = '\n';
+	      if (tty_send (tty, s, size + 6) < 0)
 		break;
-	  chopstx_mutex_unlock (&usb_mtx);
 	    }
-      chopstx_mutex_unlock (&usb_mtx);
+
+	  u ^= 1;
+	}
    }

  return 0;
--- a/example-cdc/sample.ld
+++ b/example-cdc/sample.ld
@@ -1,11 +1,11 @@
 /*
 * ST32F103 memory setup.
 */
-__main_stack_size__     = 0x0100;  /* Exception handlers     */
-__process0_stack_size__  = 0x0100;  /* Main program           */
-__process1_stack_size__  = 0x0100; /* first thread program */
-__process2_stack_size__  = 0x0100; /* second thread program */
-__process3_stack_size__  = 0x0100; /* third thread program */
+__main_stack_size__      = 0x0100; /* Idle+Exception handlers */
+__process0_stack_size__  = 0x0400; /* Main program            */
+__process1_stack_size__  = 0x0200; /* first thread program    */
+__process2_stack_size__  = 0x0200; /* second thread program   */
+__process3_stack_size__  = 0x0200; /* third thread program    */

 MEMORY
 {
@@ -30,10 +30,10 @@ SECTIONS
 	KEEP(*(.sys.version))
 	KEEP(*(.sys.board_id))
 	KEEP(*(.sys.board_name))
-	build/sys.o(.text)
-	build/sys.o(.text.*)
-	build/sys.o(.rodata)
-	build/sys.o(.rodata.*)
+	build/sys-*.o(.text)
+	build/sys-*.o(.text.*)
+	build/sys-*.o(.rodata)
+	build/sys-*.o(.rodata.*)
 	. = ALIGN(1024);
 	*(.sys.0)
 	*(.sys.1)
--- a/example-cdc/tty.h
+++ b/example-cdc/tty.h
@@ -0,0 +1,9 @@
+#define LINEBUFSIZE 128
+
+struct tty;
+
+struct tty *tty_open (void);
+void tty_wait_configured (struct tty *tty);
+void tty_wait_connection (struct tty *tty);
+int tty_send (struct tty *tty, const char *buf, int count);
+int tty_recv (struct tty *tty, char *buf, uint32_t *timeout);
--- a/example-cdc/usb-cdc.c
+++ b/example-cdc/usb-cdc.c
@@ -1,10 +1,84 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <chopstx.h>
+#include <string.h>
 #include "usb_lld.h"
+#include "tty.h"
+
+static chopstx_intr_t usb_intr;
+
+struct line_coding
+{
+  uint32_t bitrate;
+  uint8_t format;
+  uint8_t paritytype;
+  uint8_t datatype;
+}  __attribute__((packed));
+
+static const struct line_coding line_coding0 = {
+  115200, /* baud rate: 115200    */
+  0x00,   /* stop bits: 1         */
+  0x00,   /* parity:    none      */
+  0x08    /* bits:      8         */
+};
+
+/*
+ * Currently, we only support a single TTY.
+ *
+ * It is possible to extend to support multiple TTYs, for multiple
+ * interfaces.
+ *
+ * In that case, add argument to TTY_OPEN function and
+ * modify TTY_GET function to get the TTY structure.  Functions which
+ * directy accesses TTY0 (usb_device_reset and usb_set_configuration)
+ * should be modified, too.
+ *
+ * Modification of TTY_MAIN thread will be also needed to echo back
+ * input for each TTY, and the thread should run if one of TTY is
+ * opened.
+ */
+
+struct tty {
+  chopstx_mutex_t mtx;
+  chopstx_cond_t cnd;
+  uint8_t inputline[LINEBUFSIZE];   /* Line editing is supported */
+  uint8_t send_buf[LINEBUFSIZE];    /* Sending ring buffer for echo back */
+  uint32_t inputline_len    : 8;
+  uint32_t send_head        : 8;
+  uint32_t send_tail        : 8;
+  uint32_t flag_connected   : 1;
+  uint32_t flag_send_ready  : 1;
+  uint32_t flag_input_avail : 1;
+  uint32_t                  : 2;
+  uint32_t device_state     : 3;     /* USB device status */
+  struct line_coding line_coding;
+};
+
+static struct tty tty0;
+
+/*
+ * Locate TTY structure from interface number or endpoint number.
+ * Currently, it always returns tty0, because we only have the one.
+ */
+static struct tty *
+tty_get (int interface, uint8_t ep_num)
+{
+  struct tty *t = &tty0;
+
+  if (interface >= 0)
+    {
+      if (interface == 0)
+	t = &tty0;
+    }
+  else
+    {
+      if (ep_num == ENDP1 || ep_num == ENDP2 || ep_num == ENDP3)
+	t = &tty0;
+    }
+
+  return t;
+}

-extern chopstx_mutex_t usb_mtx;
-extern chopstx_cond_t cnd_usb;

 #define ENDP0_RXADDR        (0x40)
 #define ENDP0_TXADDR        (0x80)
@@ -20,7 +94,7 @@ extern chopstx_cond_t cnd_usb;
 /* USB Device Descriptor */
 static const uint8_t vcom_device_desc[18] = {
  18,   /* bLength */
-  USB_DEVICE_DESCRIPTOR_TYPE,	/* bDescriptorType */
+  DEVICE_DESCRIPTOR,		/* bDescriptorType */
  0x10, 0x01,			/* bcdUSB = 1.1 */
  0x02,				/* bDeviceClass (CDC).              */
  0x00,				/* bDeviceSubClass.                 */
@@ -35,20 +109,22 @@ static const uint8_t vcom_device_desc[18] = {
  1				/* bNumConfigurations.              */
 };

+#define VCOM_FEATURE_BUS_POWERED	0x80
+
 /* Configuration Descriptor tree for a CDC.*/
 static const uint8_t vcom_config_desc[67] = {
  9,
-  USB_CONFIGURATION_DESCRIPTOR_TYPE, /* bDescriptorType: Configuration */
+  CONFIG_DESCRIPTOR,		/* bDescriptorType: Configuration */
  /* Configuration Descriptor.*/
  67, 0x00,			/* wTotalLength.                    */
  0x02,				/* bNumInterfaces.                  */
  0x01,				/* bConfigurationValue.             */
  0,				/* iConfiguration.                  */
-  0x80,				/* bmAttributes (bus powered).      */
+  VCOM_FEATURE_BUS_POWERED,	/* bmAttributes.                    */
  50,				/* bMaxPower (100mA).               */
  /* Interface Descriptor.*/
  9,
-  USB_INTERFACE_DESCRIPTOR_TYPE,
+  INTERFACE_DESCRIPTOR,
  0x00,		   /* bInterfaceNumber.                */
  0x00,		   /* bAlternateSetting.               */
  0x01,		   /* bNumEndpoints.                   */
@@ -87,14 +163,14 @@ static const uint8_t vcom_config_desc[67] = {
  0x01,         /* bSlaveInterface0 (Data Class Interface).  */
  /* Endpoint 2 Descriptor.*/
  7,
-  USB_ENDPOINT_DESCRIPTOR_TYPE,
+  ENDPOINT_DESCRIPTOR,
  ENDP2|0x80,    /* bEndpointAddress.    */
  0x03,          /* bmAttributes (Interrupt).        */
  0x08, 0x00,	 /* wMaxPacketSize.                  */
  0xFF,		 /* bInterval.                       */
  /* Interface Descriptor.*/
  9,
-  USB_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType: */
+  INTERFACE_DESCRIPTOR, /* bDescriptorType: */
  0x01,          /* bInterfaceNumber.                */
  0x00,          /* bAlternateSetting.               */
  0x02,          /* bNumEndpoints.                   */
@@ -104,14 +180,14 @@ static const uint8_t vcom_config_desc[67] = {
  0x00,		 /* iInterface.                      */
  /* Endpoint 3 Descriptor.*/
  7,
-  USB_ENDPOINT_DESCRIPTOR_TYPE,	/* bDescriptorType: Endpoint */
+  ENDPOINT_DESCRIPTOR,		/* bDescriptorType: Endpoint */
  ENDP3,    /* bEndpointAddress. */
  0x02,				/* bmAttributes (Bulk).             */
  0x40, 0x00,			/* wMaxPacketSize.                  */
  0x00,				/* bInterval.                       */
  /* Endpoint 1 Descriptor.*/
  7,
-  USB_ENDPOINT_DESCRIPTOR_TYPE,	/* bDescriptorType: Endpoint */
+  ENDPOINT_DESCRIPTOR,		/* bDescriptorType: Endpoint */
  ENDP1|0x80,			/* bEndpointAddress. */
  0x02,				/* bmAttributes (Bulk).             */
  0x40, 0x00,			/* wMaxPacketSize.                  */
@@ -124,13 +200,13 @@ static const uint8_t vcom_config_desc[67] = {
 */
 static const uint8_t vcom_string0[4] = {
  4,				/* bLength */
-  USB_STRING_DESCRIPTOR_TYPE,
+  STRING_DESCRIPTOR,
  0x09, 0x04			/* LangID = 0x0409: US-English */
 };

 static const uint8_t vcom_string1[] = {
  23*2+2,			/* bLength */
-  USB_STRING_DESCRIPTOR_TYPE,	/* bDescriptorType */
+  STRING_DESCRIPTOR,		/* bDescriptorType */
  /* Manufacturer: "Flying Stone Technology" */
  'F', 0, 'l', 0, 'y', 0, 'i', 0, 'n', 0, 'g', 0, ' ', 0, 'S', 0,
  't', 0, 'o', 0, 'n', 0, 'e', 0, ' ', 0, 'T', 0, 'e', 0, 'c', 0,
@@ -139,7 +215,7 @@ static const uint8_t vcom_string1[] = {

 static const uint8_t vcom_string2[] = {
  14*2+2,			/* bLength */
-  USB_STRING_DESCRIPTOR_TYPE,	/* bDescriptorType */
+  STRING_DESCRIPTOR,		/* bDescriptorType */
  /* Product name: "Chopstx Sample" */
  'C', 0, 'h', 0, 'o', 0, 'p', 0, 's', 0, 't', 0, 'x', 0, ' ', 0,
  'S', 0, 'a', 0, 'm', 0, 'p', 0, 'l', 0, 'e', 0,
@@ -150,119 +226,122 @@ static const uint8_t vcom_string2[] = {
 */
 static const uint8_t vcom_string3[28] = {
  28,				    /* bLength */
-  USB_STRING_DESCRIPTOR_TYPE,	    /* bDescriptorType */
+  STRING_DESCRIPTOR,		    /* bDescriptorType */
  '0', 0,  '.', 0,  '0', 0, '0', 0, /* Version number */
 };


 #define NUM_INTERFACES 2

-uint32_t bDeviceState = UNCONNECTED; /* USB device status */
-uint8_t connected;

-void
-usb_cb_device_reset (void)
+static void
+usb_device_reset (struct usb_dev *dev)
 {
-  /* Set DEVICE as not configured */
-  usb_lld_set_configuration (0);
-
-  /* Current Feature initialization */
-  usb_lld_set_feature (vcom_config_desc[7]);
-
-  usb_lld_reset ();
+  usb_lld_reset (dev, VCOM_FEATURE_BUS_POWERED);

  /* Initialize Endpoint 0 */
  usb_lld_setup_endpoint (ENDP0, EP_CONTROL, 0, ENDP0_RXADDR, ENDP0_TXADDR, 64);

-  chopstx_mutex_lock (&usb_mtx);
-  connected = 0;
-  bDeviceState = ATTACHED;
-  chopstx_cond_signal (&cnd_usb);
-  chopstx_mutex_unlock (&usb_mtx);
+  chopstx_mutex_lock (&tty0.mtx);
+  tty0.inputline_len = 0;
+  tty0.send_head = tty0.send_tail = 0;
+  tty0.flag_connected = 0;
+  tty0.flag_send_ready = 1;
+  tty0.flag_input_avail = 0;
+  tty0.device_state = ATTACHED;
+  memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
+  chopstx_mutex_unlock (&tty0.mtx);
 }


 #define CDC_CTRL_DTR            0x0001

-void
-usb_cb_ctrl_write_finish (uint8_t req, uint8_t req_no, uint16_t value)
+static void
+usb_ctrl_write_finish (struct usb_dev *dev)
 {
-  uint8_t type_rcp = req & (REQUEST_TYPE|RECIPIENT);
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);

-  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT)
-      && USB_SETUP_SET (req) && req_no == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0
+      && USB_SETUP_SET (arg->type)
+      && arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
    {
+      struct tty *t = tty_get (arg->index, 0);
+
      /* Open/close the connection.  */
-      chopstx_mutex_lock (&usb_mtx);
-      connected = ((value & CDC_CTRL_DTR) != 0)? 1 : 0;
-      chopstx_cond_signal (&cnd_usb);
-      chopstx_mutex_unlock (&usb_mtx);
+      chopstx_mutex_lock (&t->mtx);
+      t->flag_connected = ((arg->value & CDC_CTRL_DTR) != 0);
+      chopstx_cond_signal (&t->cnd);
+      chopstx_mutex_unlock (&t->mtx);
    }
+
+  /*
+   * The transaction was already finished.  So, it is no use to call
+   * usb_lld_ctrl_error when the condition does not match.
+   */
 }

-struct line_coding
-{
-  uint32_t bitrate;
-  uint8_t format;
-  uint8_t paritytype;
-  uint8_t datatype;
-}  __attribute__((packed));
-
-static struct line_coding line_coding = {
-  115200, /* baud rate: 115200    */
-  0x00,   /* stop bits: 1         */
-  0x00,   /* parity:    none      */
-  0x08    /* bits:      8         */
-};


 static int
-vcom_port_data_setup (uint8_t req, uint8_t req_no, struct control_info *detail)
+vcom_port_data_setup (struct usb_dev *dev)
 {
-  if (USB_SETUP_GET (req))
+  struct device_req *arg = &dev->dev_req;
+
+  if (USB_SETUP_GET (arg->type))
    {
-      if (req_no == USB_CDC_REQ_GET_LINE_CODING)
-	return usb_lld_reply_request (&line_coding, sizeof(line_coding), detail);
+      struct tty *t = tty_get (arg->index, 0);
+
+      if (arg->request == USB_CDC_REQ_GET_LINE_CODING)
+	return usb_lld_ctrl_send (dev, &t->line_coding,
+				  sizeof (struct line_coding));
    }
  else  /* USB_SETUP_SET (req) */
    {
-      if (req_no == USB_CDC_REQ_SET_LINE_CODING
-	  && detail->len == sizeof (line_coding))
+      if (arg->request == USB_CDC_REQ_SET_LINE_CODING
+	  && arg->len == sizeof (struct line_coding))
 	{
-	  usb_lld_set_data_to_recv (&line_coding, sizeof (line_coding));
-	  return USB_SUCCESS;
+	  struct tty *t = tty_get (arg->index, 0);
+
+	  return usb_lld_ctrl_recv (dev, &t->line_coding,
+				    sizeof (struct line_coding));
 	}
-      else if (req_no == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
-	return USB_SUCCESS;
+      else if (arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
+	return usb_lld_ctrl_ack (dev);
    }

-  return USB_UNSUPPORT;
+  return -1;
 }

-int
-usb_cb_setup (uint8_t req, uint8_t req_no, struct control_info *detail)
+static int
+usb_setup (struct usb_dev *dev)
 {
-  uint8_t type_rcp = req & (REQUEST_TYPE|RECIPIENT);
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);

-  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && detail->index == 0)
-    return vcom_port_data_setup (req, req_no, detail);
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0)
+    return vcom_port_data_setup (dev);

-  return USB_UNSUPPORT;
+  return -1;
 }

-int
-usb_cb_get_descriptor (uint8_t rcp, uint8_t desc_type, uint8_t desc_index,
-		       struct control_info *detail)
+static int
+usb_get_descriptor (struct usb_dev *dev)
 {
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+  uint8_t desc_type = (arg->value >> 8);
+  uint8_t desc_index = (arg->value & 0xff);
+
  if (rcp != DEVICE_RECIPIENT)
-    return USB_UNSUPPORT;
+    return -1;

  if (desc_type == DEVICE_DESCRIPTOR)
-    return usb_lld_reply_request (vcom_device_desc, sizeof (vcom_device_desc),
-				  detail);
+    return usb_lld_ctrl_send (dev,
+			      vcom_device_desc, sizeof (vcom_device_desc));
  else if (desc_type == CONFIG_DESCRIPTOR)
-    return usb_lld_reply_request (vcom_config_desc, sizeof (vcom_config_desc),
-				  detail);
+    return usb_lld_ctrl_send (dev,
+			      vcom_config_desc, sizeof (vcom_config_desc));
  else if (desc_type == STRING_DESCRIPTOR)
    {
      const uint8_t *str;
@@ -287,13 +366,13 @@ usb_cb_get_descriptor (uint8_t rcp, uint8_t desc_type, uint8_t desc_index,
 	  size = sizeof (vcom_string3);
 	  break;
 	default:
-	  return USB_UNSUPPORT;
+	  return -1;
 	}

-      return usb_lld_reply_request (str, size, detail);
+      return usb_lld_ctrl_send (dev, str, size);
    }

-  return USB_UNSUPPORT;
+  return -1;
 }

 static void
@@ -312,6 +391,7 @@ vcom_setup_endpoints_for_interface (uint16_t interface, int stop)
 	{
 	  usb_lld_setup_endpoint (ENDP1, EP_BULK, 0, 0, ENDP1_TXADDR, 0);
 	  usb_lld_setup_endpoint (ENDP3, EP_BULK, 0, ENDP3_RXADDR, 0, 64);
+	  /* Start with no data receiving (ENDP3 not enabled)*/
 	}
      else
 	{
@@ -321,94 +401,558 @@ vcom_setup_endpoints_for_interface (uint16_t interface, int stop)
    }
 }

-int usb_cb_handle_event (uint8_t event_type, uint16_t value)
+static int
+usb_set_configuration (struct usb_dev *dev)
 {
  int i;
  uint8_t current_conf;

-  switch (event_type)
-    {
-    case USB_EVENT_ADDRESS:
-      bDeviceState = ADDRESSED;
-      return USB_SUCCESS;
-    case USB_EVENT_CONFIG:
-      current_conf = usb_lld_current_configuration ();
+  current_conf = usb_lld_current_configuration (dev);
  if (current_conf == 0)
    {
-	  if (value != 1)
-	    return USB_UNSUPPORT;
+      if (dev->dev_req.value != 1)
+	return -1;

-	  usb_lld_set_configuration (1);
+      usb_lld_set_configuration (dev, 1);
      for (i = 0; i < NUM_INTERFACES; i++)
 	vcom_setup_endpoints_for_interface (i, 0);
-	  bDeviceState = CONFIGURED;
+      chopstx_mutex_lock (&tty0.mtx);
+      tty0.device_state = CONFIGURED;
+      chopstx_cond_signal (&tty0.cnd);
+      chopstx_mutex_unlock (&tty0.mtx);
    }
-      else if (current_conf != value)
+  else if (current_conf != dev->dev_req.value)
    {
-	  if (value != 0)
-	    return USB_UNSUPPORT;
+      if (dev->dev_req.value != 0)
+	return -1;

-	  usb_lld_set_configuration (0);
+      usb_lld_set_configuration (dev, 0);
      for (i = 0; i < NUM_INTERFACES; i++)
 	vcom_setup_endpoints_for_interface (i, 1);
-	  bDeviceState = ADDRESSED;
-	}
-      /* Do nothing when current_conf == value */
-      return USB_SUCCESS;
-
-      return USB_SUCCESS;
-    default:
-      break;
+      chopstx_mutex_lock (&tty0.mtx);
+      tty0.device_state = ADDRESSED;
+      chopstx_cond_signal (&tty0.cnd);
+      chopstx_mutex_unlock (&tty0.mtx);
    }

-  return USB_UNSUPPORT;
+  usb_lld_ctrl_ack (dev);
+  return 0;
 }


-int usb_cb_interface (uint8_t cmd, struct control_info *detail)
+static int
+usb_set_interface (struct usb_dev *dev)
 {
-  const uint8_t zero = 0;
-  uint16_t interface = detail->index;
-  uint16_t alt = detail->value;
+  uint16_t interface = dev->dev_req.index;
+  uint16_t alt = dev->dev_req.value;

  if (interface >= NUM_INTERFACES)
-    return USB_UNSUPPORT;
+    return -1;

-  switch (cmd)
-    {
-    case USB_SET_INTERFACE:
  if (alt != 0)
-	return USB_UNSUPPORT;
+    return -1;
  else
    {
      vcom_setup_endpoints_for_interface (interface, 0);
-	  return USB_SUCCESS;
+      usb_lld_ctrl_ack (dev);
+      return 0;
    }
+}

-    case USB_GET_INTERFACE:
-      return usb_lld_reply_request (&zero, 1, detail);
+static int
+usb_get_interface (struct usb_dev *dev)
+{
+  const uint8_t zero = 0;
+  uint16_t interface = dev->dev_req.index;

+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  /* We don't have alternate interface, so, always return 0.  */
+  return usb_lld_ctrl_send (dev, &zero, 1);
+}
+
+static int
+usb_get_status_interface (struct usb_dev *dev)
+{
+  const uint16_t status_info = 0;
+  uint16_t interface = dev->dev_req.index;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  return usb_lld_ctrl_send (dev, &status_info, 2);
+}
+
+
+/*
+ * Put a character into the ring buffer to be send back.
+ */
+static void
+put_char_to_ringbuffer (struct tty *t, int c)
+{
+  uint32_t next = (t->send_tail + 1) % LINEBUFSIZE;
+
+  if (t->send_head == next)
+    /* full */
+    /* All that we can do is ignore this char. */
+    return;
+  
+  t->send_buf[t->send_tail] = c;
+  t->send_tail = next;
+}
+
+/*
+ * Get characters from ring buffer into S.
+ */
+static int
+get_chars_from_ringbuffer (struct tty *t, uint8_t *s, int len)
+{
+  int i = 0;
+
+  if (t->send_head == t->send_tail)
+    /* Empty */
+    return i;
+
+  do
+    {
+      s[i++] = t->send_buf[t->send_head];
+      t->send_head = (t->send_head + 1) % LINEBUFSIZE;
+    }
+  while (t->send_head != t->send_tail && i < len);
+
+  return i;
+}
+
+
+static void
+tty_echo_char (struct tty *t, int c)
+{
+  put_char_to_ringbuffer (t, c);
+}
+
+
+static void
+usb_tx_done (uint8_t ep_num, uint16_t len)
+{
+  struct tty *t = tty_get (-1, ep_num);
+
+  (void)len;
+
+  if (ep_num == ENDP1)
+    {
+      chopstx_mutex_lock (&t->mtx);
+      if (t->flag_send_ready == 0)
+	{
+	  t->flag_send_ready = 1;
+	  chopstx_cond_signal (&t->cnd);
+	}
+      chopstx_mutex_unlock (&t->mtx);
+    }
+  else if (ep_num == ENDP2)
+    {
+      /* Nothing */
+    }
+}
+
+
+static int
+tty_input_char (struct tty *t, int c)
+{
+  unsigned int i;
+  int r = 0;
+
+  /* Process DEL, C-U, C-R, and RET as editing command. */
+  chopstx_mutex_lock (&t->mtx);
+  switch (c)
+    {
+    case 0x0d: /* Control-M */
+      t->inputline[t->inputline_len++] = '\n';
+      tty_echo_char (t, 0x0d);
+      tty_echo_char (t, 0x0a);
+      t->flag_input_avail = 1;
+      r = 1;
+      chopstx_cond_signal (&t->cnd);
+      break;
+    case 0x12: /* Control-R */
+      tty_echo_char (t, '^');
+      tty_echo_char (t, 'R');
+      tty_echo_char (t, 0x0d);
+      tty_echo_char (t, 0x0a);
+      for (i = 0; i < t->inputline_len; i++)
+	tty_echo_char (t, t->inputline[i]);
+      break;
+    case 0x15: /* Control-U */
+      for (i = 0; i < t->inputline_len; i++)
+	{
+	  tty_echo_char (t, 0x08);
+	  tty_echo_char (t, 0x20);
+	  tty_echo_char (t, 0x08);
+	}
+      t->inputline_len = 0;
+      break;
+    case 0x7f: /* DEL    */
+      if (t->inputline_len > 0)
+	{
+	  tty_echo_char (t, 0x08);
+	  tty_echo_char (t, 0x20);
+	  tty_echo_char (t, 0x08);
+	  t->inputline_len--;
+	}
+      break;
    default:
-    case USB_QUERY_INTERFACE:
-      return USB_SUCCESS;
+      if (t->inputline_len < sizeof (t->inputline) - 1)
+	{
+	  tty_echo_char (t, c);
+	  t->inputline[t->inputline_len++] = c;
+	}
+      else
+	/* Beep */
+	tty_echo_char (t, 0x0a);
+      break;
+    }
+  chopstx_mutex_unlock (&t->mtx);
+  return r;
+}
+
+static void
+usb_rx_ready (uint8_t ep_num, uint16_t len)
+{
+  uint8_t recv_buf[64];
+  struct tty *t = tty_get (-1, ep_num);
+
+  if (ep_num == ENDP3)
+    {
+      int i;
+
+      usb_lld_rxcpy (recv_buf, ep_num, 0, len);
+      for (i = 0; i < len; i++)
+	if (tty_input_char (t, recv_buf[i]))
+	  break;
+
+      chopstx_mutex_lock (&t->mtx);
+      if (t->flag_input_avail == 0)
+	usb_lld_rx_enable (ENDP3);
+      chopstx_mutex_unlock (&t->mtx);
    }
 }

-void
-EP1_IN_Callback (void)
+static void *tty_main (void *arg);
+
+#define INTR_REQ_USB 20
+#define PRIO_TTY      4
+
+extern uint8_t __process3_stack_base__[], __process3_stack_size__[];
+#define STACK_ADDR_TTY ((uint32_t)__process3_stack_base__)
+#define STACK_SIZE_TTY ((uint32_t)__process3_stack_size__)
+
+struct tty *
+tty_open (void)
 {
-  chopstx_mutex_lock (&usb_mtx);
-  chopstx_cond_signal (&cnd_usb);
-  chopstx_mutex_unlock (&usb_mtx);
+  chopstx_mutex_init (&tty0.mtx);
+  chopstx_cond_init (&tty0.cnd);
+  tty0.inputline_len = 0;
+  tty0.send_head = tty0.send_tail = 0;
+  tty0.flag_connected = 0;
+  tty0.flag_send_ready = 1;
+  tty0.flag_input_avail = 0;
+  tty0.device_state = UNCONNECTED;
+  memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
+
+  chopstx_create (PRIO_TTY, STACK_ADDR_TTY, STACK_SIZE_TTY, tty_main, &tty0);
+  return &tty0;
 }

-void
-EP2_IN_Callback (void)
+
+static void *
+tty_main (void *arg)
 {
+  struct tty *t = arg;
+  struct usb_dev dev;
+  int e;
+
+#if defined(OLDER_SYS_H)
+  /*
+   * Historically (before sys < 3.0), NVIC priority setting for USB
+   * interrupt was done in usb_lld_sys_init.  Thus this code.
+   *
+   * When USB interrupt occurs between usb_lld_init (which assumes
+   * ISR) and chopstx_claim_irq (which clears pending interrupt),
+   * invocation of usb_lld_event_handler won't occur.
+   *
+   * Calling usb_lld_event_handler is no harm even if there were no
+   * interrupts, thus, we call it unconditionally here, just in case
+   * if there is a request.
+   *
+   * We can't call usb_lld_init after chopstx_claim_irq, as
+   * usb_lld_init does its own setting for NVIC.  Calling
+   * chopstx_claim_irq after usb_lld_init overrides that.
+   *
+   */
+  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
+  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
+  goto event_handle;
+#else
+  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
+  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
+#endif
+
+  while (1)
+    {
+      chopstx_intr_wait (&usb_intr);
+      if (usb_intr.ready)
+	{
+	  uint8_t ep_num;
+#if defined(OLDER_SYS_H)
+	event_handle:
+#endif
+	  /*
+	   * When interrupt is detected, call usb_lld_event_handler.
+	   * The event may be one of following:
+	   *    (1) Transfer to endpoint (bulk or interrupt)
+	   *        In this case EP_NUM is encoded in the variable E.
+	   *    (2) "NONE" event: some trasfer was done, but all was
+	   *        done by lower layer, no other work is needed in
+	   *        upper layer.
+	   *    (3) Device events: Reset or Suspend
+	   *    (4) Device requests to the endpoint zero.
+	   *        
+	   */
+	  e = usb_lld_event_handler (&dev);
+	  ep_num = USB_EVENT_ENDP (e);
+
+	  if (ep_num != 0)
+	    {
+	      if (USB_EVENT_TXRX (e))
+		usb_tx_done (ep_num, USB_EVENT_LEN (e));
+	      else
+		usb_rx_ready (ep_num, USB_EVENT_LEN (e));
+	    }
+	  else
+	    switch (USB_EVENT_ID (e))
+	      {
+	      case USB_EVENT_DEVICE_RESET:
+		usb_device_reset (&dev);
+		continue;
+
+	      case USB_EVENT_DEVICE_ADDRESSED:
+		/* The addres is assigned to the device.  We don't
+		 * need to do anything for this actually, but in this
+		 * application, we maintain the USB status of the
+		 * device.  Usually, just "continue" as EVENT_OK is
+		 * OK.
+		 */
+		chopstx_mutex_lock (&tty0.mtx);
+		tty0.device_state = ADDRESSED;
+		chopstx_cond_signal (&tty0.cnd);
+		chopstx_mutex_unlock (&tty0.mtx);
+		continue;
+
+	      case USB_EVENT_GET_DESCRIPTOR:
+		if (usb_get_descriptor (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_CONFIGURATION:
+		if (usb_set_configuration (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_INTERFACE:
+		if (usb_set_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_REQUEST:
+		/* Device specific device request.  */
+		if (usb_setup (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_STATUS_INTERFACE:
+		if (usb_get_status_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_INTERFACE:
+		if (usb_get_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_FEATURE_DEVICE:
+	      case USB_EVENT_SET_FEATURE_ENDPOINT:
+	      case USB_EVENT_CLEAR_FEATURE_DEVICE:
+	      case USB_EVENT_CLEAR_FEATURE_ENDPOINT:
+		usb_lld_ctrl_ack (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_WRITE_FINISH:
+		/* Control WRITE transfer finished.  */
+		usb_ctrl_write_finish (&dev);
+		continue;
+
+	      case USB_EVENT_OK:
+	      case USB_EVENT_DEVICE_SUSPEND:
+	      default:
+		continue;
+	      }
+	}
+
+      chopstx_mutex_lock (&t->mtx);
+      if (t->device_state == CONFIGURED && t->flag_connected
+	  && t->flag_send_ready)
+	{
+	  uint8_t line[32];
+	  int len = get_chars_from_ringbuffer (t, line, sizeof (len));
+
+	  if (len)
+	    {
+	      usb_lld_txcpy (line, ENDP1, 0, len);
+	      usb_lld_tx_enable (ENDP1, len);
+	      t->flag_send_ready = 0;
+	    }
+	}
+      chopstx_mutex_unlock (&t->mtx);
+    }
+
+  return NULL;
 }

+
 void
-EP3_OUT_Callback (void)
+tty_wait_configured (struct tty *t)
 {
+  chopstx_mutex_lock (&t->mtx);
+  while (t->device_state != CONFIGURED)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  chopstx_mutex_unlock (&t->mtx);
+}
+
+
+void
+tty_wait_connection (struct tty *t)
+{
+  chopstx_mutex_lock (&t->mtx);
+  while (t->flag_connected == 0)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  t->flag_send_ready = 1;
+  t->flag_input_avail = 0;
+  t->send_head = t->send_tail = 0;
+  t->inputline_len = 0;
+  usb_lld_rx_enable (ENDP3);	/* Accept input for line */
+  chopstx_mutex_unlock (&t->mtx);
+}
+
+static int
+check_tx (struct tty *t)
+{
+  if (t->flag_send_ready)
+    /* TX done */
+    return 1;
+  if (t->flag_connected == 0)
+    /* Disconnected */
+    return -1;
+  return 0;
+}
+
+int
+tty_send (struct tty *t, const char *buf, int len)
+{
+  int r;
+  const char *p;
+  int count;
+
+  p = buf;
+  count = len >= 64 ? 64 : len;
+
+  while (1)
+    {
+      chopstx_mutex_lock (&t->mtx);
+      while ((r = check_tx (t)) == 0)
+	chopstx_cond_wait (&t->cnd, &t->mtx);
+      if (r > 0)
+	{
+	  usb_lld_txcpy (p, ENDP1, 0, count);
+	  usb_lld_tx_enable (ENDP1, count);
+	  t->flag_send_ready = 0;
+	}
+      chopstx_mutex_unlock (&t->mtx);
+
+      len -= count;
+      p += count;
+      if (len == 0 && count != 64)
+	/*
+	 * The size of the last packet should be != 0
+	 * If 64, send ZLP (zelo length packet)
+	 */
+	break;
+      count = len >= 64 ? 64 : len;
+    }
+
+  return r;
+}
+
+
+static int
+check_rx (void *arg)
+{
+  struct tty *t = arg;
+
+  if (t->flag_input_avail)
+    /* RX */
+    return 1;
+  if (t->flag_connected == 0)
+    /* Disconnected */
+    return 1;
+  return 0;
+}
+
+/*
+ * Returns -1 on connection close
+ *          0 on timeout.
+ *          >0 length of the inputline (including final \n) 
+ *
+ */
+int
+tty_recv (struct tty *t, char *buf, uint32_t *timeout)
+{
+  int r;
+  chopstx_poll_cond_t poll_desc;
+
+  poll_desc.type = CHOPSTX_POLL_COND;
+  poll_desc.ready = 0;
+  poll_desc.cond = &t->cnd;
+  poll_desc.mutex = &t->mtx;
+  poll_desc.check = check_rx;
+  poll_desc.arg = t;
+
+  while (1)
+    {
+      struct chx_poll_head *pd_array[1] = {
+	(struct chx_poll_head *)&poll_desc
+      };
+      chopstx_poll (timeout, 1, pd_array);
+      chopstx_mutex_lock (&t->mtx);
+      r = check_rx (t);
+      chopstx_mutex_unlock (&t->mtx);
+      if (r || (timeout != NULL && *timeout == 0))
+	break;
+    }
+
+  chopstx_mutex_lock (&t->mtx);
+  if (t->flag_connected == 0)
+    r = -1;
+  else if (t->flag_input_avail)
+    {
+      r = t->inputline_len;
+      memcpy (buf, t->inputline, r);
+      t->flag_input_avail = 0;
      usb_lld_rx_enable (ENDP3);
+      t->inputline_len = 0;
+    }
+  else
+    r = 0;
+  chopstx_mutex_unlock (&t->mtx);
+
+  return r;
 }
--- a/example-cdc/usb_lld.h
+++ b/example-cdc/usb_lld.h
@@ -1,122 +0,0 @@
-#define USB_DEVICE_DESCRIPTOR_TYPE              0x01
-#define USB_CONFIGURATION_DESCRIPTOR_TYPE       0x02
-#define USB_STRING_DESCRIPTOR_TYPE              0x03
-#define USB_INTERFACE_DESCRIPTOR_TYPE           0x04
-#define USB_ENDPOINT_DESCRIPTOR_TYPE            0x05
-
-#define STANDARD_ENDPOINT_DESC_SIZE             0x09
-
-/* endpoints enumeration */
-#define ENDP0       ((uint8_t)0)
-#define ENDP1       ((uint8_t)1)
-#define ENDP2       ((uint8_t)2)
-#define ENDP3       ((uint8_t)3)
-#define ENDP4       ((uint8_t)4)
-#define ENDP5       ((uint8_t)5)
-#define ENDP6       ((uint8_t)6)
-#define ENDP7       ((uint8_t)7)
-
-/* EP_TYPE[1:0] EndPoint TYPE */
-#define EP_BULK        (0x0000) /* EndPoint BULK        */
-#define EP_CONTROL     (0x0200) /* EndPoint CONTROL     */
-#define EP_ISOCHRONOUS (0x0400) /* EndPoint ISOCHRONOUS */
-#define EP_INTERRUPT   (0x0600) /* EndPoint INTERRUPT   */
-
-enum RECIPIENT_TYPE
-{
-  DEVICE_RECIPIENT,     /* Recipient device    */
-  INTERFACE_RECIPIENT,  /* Recipient interface */
-  ENDPOINT_RECIPIENT,   /* Recipient endpoint  */
-  OTHER_RECIPIENT
-};
-
-enum DESCRIPTOR_TYPE
-{
-  DEVICE_DESCRIPTOR = 1,
-  CONFIG_DESCRIPTOR,
-  STRING_DESCRIPTOR,
-  INTERFACE_DESCRIPTOR,
-  ENDPOINT_DESCRIPTOR
-};
-
-#define REQUEST_DIR       0x80  /* Mask to get request dir  */
-#define REQUEST_TYPE      0x60  /* Mask to get request type */
-#define STANDARD_REQUEST  0x00  /* Standard request         */
-#define CLASS_REQUEST     0x20  /* Class request            */
-#define VENDOR_REQUEST    0x40  /* Vendor request           */
-#define RECIPIENT         0x1F  /* Mask to get recipient    */
-
-#define USB_SETUP_SET(req) ((req & REQUEST_DIR) == 0)
-#define USB_SETUP_GET(req) ((req & REQUEST_DIR) != 0)
-
-enum
-{
-  USB_UNSUPPORT = 0,
-  USB_SUCCESS = 1,
-};
-
-struct control_info {
-  uint16_t value;
-  uint16_t index;
-  uint16_t len;
-};
-
-void usb_cb_device_reset (void);
-int usb_cb_setup (uint8_t req, uint8_t req_no, struct control_info *detail);
-int usb_cb_interface (uint8_t cmd, struct control_info *detail);
-int usb_cb_get_descriptor (uint8_t rcp, uint8_t desc_type, uint8_t desc_index,
-			   struct control_info *detail);
-int usb_cb_handle_event (uint8_t event_type, uint16_t value);
-void usb_cb_ctrl_write_finish (uint8_t req, uint8_t req_no, uint16_t value);
-
-enum {
-  USB_EVENT_ADDRESS,
-  USB_EVENT_CONFIG,
-  USB_EVENT_SUSPEND,
-  USB_EVENT_WAKEUP,
-  USB_EVENT_STALL,
-};
-
-enum {
-  USB_SET_INTERFACE,
-  USB_GET_INTERFACE,
-  USB_QUERY_INTERFACE,
-};
-
-enum DEVICE_STATE
-{
-  UNCONNECTED,
-  ATTACHED,
-  POWERED,
-  SUSPENDED,
-  ADDRESSED,
-  CONFIGURED
-};
-
-void usb_lld_init (uint8_t feature);
-void usb_lld_to_pmabuf (const void *src, uint16_t addr, size_t n);
-void usb_lld_from_pmabuf (void *dst, uint16_t addr, size_t n);
-void usb_lld_stall_tx (int ep_num);
-void usb_lld_stall_rx (int ep_num);
-int usb_lld_tx_data_len (int ep_num);
-void usb_lld_txcpy (const void *src, int ep_num, int offset, size_t len);
-void usb_lld_tx_enable (int ep_num, size_t len);
-void usb_lld_write (uint8_t ep_num, const void *buf, size_t len);
-int usb_lld_reply_request (const void *buf, size_t buflen,
-			   struct control_info *ctrl);
-void usb_lld_rx_enable (int ep_num);
-int usb_lld_rx_data_len (int ep_num);
-void usb_lld_rxcpy (uint8_t *dst, int ep_num, int offset, size_t len);
-void usb_lld_reset (void);
-void usb_lld_setup_endpoint (int ep_num, int ep_type, int ep_kind,
-			     int ep_rx_addr, int ep_tx_addr,
-			     int ep_rx_memory_size);
-void usb_lld_set_configuration (uint8_t config);
-uint8_t usb_lld_current_configuration (void);
-void usb_lld_set_feature (uint8_t feature);
-void usb_lld_set_data_to_recv (const void *p, size_t len);
-
-void usb_lld_prepare_shutdown (void);
-void usb_lld_shutdown (void);
-
-void usb_interrupt_handler (void);
--- a/example-fraucheky/EXAMPLE-README
+++ b/example-fraucheky/EXAMPLE-README
@@ -0,0 +1,43 @@
+(0) configure and make
+
+This example assumes that you have fraucheky source code
+along with chopstx.
+
+    --- chopstx --- chostx --- example-fraucheky
+                 |
+                 \- fraucheky
+
+
+If you use vendor id and product id of 234b:0004 under
+the condition of FSIJ, you can configure this program as:
+
+    $ ./configure --vidpid=234b:0004
+
+then, invoke make.
+
+    $ make
+
+
+(1) preparation as root 
+
+Install USBIP host module
+# modprobe vhci_hcd
+
+
+(2) Run sample program of USBIP server
+
+$ ./sample-msc
+
+
+(3) Use the USB device as root
+
+Attach the Chopstx application program (USBIP device) to USBIP host.
+
+# usbip attach -r 127.0.0.1 -b 1-1
+
+
+(4) Use the USB Mass Storage Class device
+
+You can mount the storage.
+
+Unmounting the storage, the program will exit.
--- a/example-fraucheky/INDEX.HTM
+++ b/example-fraucheky/INDEX.HTM
@@ -0,0 +1,62 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head><title>How to use this device</title>
+<meta http-equiv="content-type" content="text/html; charset=utf-8" />
+</head>
+
+<body>
+<h1>How to use this device</h1>
+<h2>Introduction</h2>
+<p>This is an example program for GNU/Linux to see how 
+   Chopstx works with USB emulation by USBIP.</p>
+<p>Now, you are accessing this file.
+   It means that the device is running as USB memory
+   (USB Mass Storage Class device).</p>
+
+<h2>README, GNU GPL and Corresponding Source code</h2>
+<p>In this program, it contains copyrighted software that is licensed under
+   the GPLv3.  Please see README for the explanation of the software and see
+   GNU GPLv3 for terms and conditions.</p>
+<p>You may obtain the complete Corresponding Source code from git repositories.
+   This program uses Chopstx for RTOS, and Fraucheky for
+   GPL container.  Those code are availabe in the Chopstx repository.</p>
+<p>You can also download tarballs from the repository.</p>
+<ul>
+  <li><a href="README">README</a></li>
+  <li><a href="COPYING">GNU GPLv3</a></li>
+  <li><a href="https://anonscm.debian.org/cgit/gnuk/chopstx/">Chopstx Repository</a></li>
+  <li><a href="https://git.gniibe.org/gitweb/?p=chopstx/chopstx.git;a=snapshot;h=@REVISION_CHOPSTX@;sf=tgz">Chopstx tarball</a></li>
+  <li><a href="https://git.gniibe.org/gitweb/?p=chopstx/fraucheky.git;a=snapshot;h=@REVISION_FRAUCHEKY@;sf=tgz">Fraucheky tarball</a></li>
+</ul>
+
+<h3>Source code by physical media</h3>
+<p>For those who want source code by physical media, Flying Stone Technology sells a microSD card (with SD card adapter) which contains all repositories at git.gniibe.org.</p>
+<p>The price is JPY1000 for a single media including tax and shipment in Japan.  Please use YUUBIN-FURIKAE account of Flying Stone Technology below.  Note that the account name is in Japanese (which means: Flying Stone Technology).</p>
+<p>On the form of YUUBIN-FURIKAE, you specify your address and you can write some message.  The media will be sent to your address written in the form.</p>
+<ul>
+  <li>Account No: 00110-2-346446</li>
+  <li>Account name: Tobiishi Gijutsu</li>
+</ul>
+
+<p>If it is difficult for you to use YUUBIN-FURIKAE, please write to the following address.</p>
+<ul>
+  <li>Niibe Yutaka</li>
+  <li>Flying Stone Technology</li>
+  <li>1-5-14 Iwagami, Maebashi</li>
+  <li>Gunma, 371-0031 JAPAN</li>
+</ul>
+
+<p>This source code offer will be valid for three years after the shipment of this device or at least until 2021-03-31.</p>
+
+<h2>Links</h2>
+<ul>
+  <li><a href="https://www.gniibe.org/category/fst-01.html">
+      FST-01 support pages</a></li>
+  <li><a href="https://lists.alioth.debian.org/mailman/listinfo/gnuk-users">
+      Mailing list: Gnuk Users</a></li>
+  <li><a href="https://www.gnu.org/gnu/manifesto.ja.html">
+      GNU Manifesto (Japanese Translation)</a></li>
+</ul>
+</body>
+</html>
--- a/example-fraucheky/Makefile
+++ b/example-fraucheky/Makefile
@@ -0,0 +1,45 @@
+# Makefile for NeuG
+
+# Define project name here
+PROJECT = sample-msc
+
+CHOPSTX = ..
+FRAUCHEKY = ../../fraucheky
+LDSCRIPT=
+
+CSRC = main.c
+CHIP=gnu-linux
+USE_SYS =
+USE_USB = yes
+EMULATION=yes
+# USE_ADC = yes
+
+include $(FRAUCHEKY)/src.mk
+
+###################################
+CROSS =
+CC   = $(CROSS)gcc
+LD   = $(CROSS)gcc
+OBJCOPY   = $(CROSS)objcopy
+
+MCU   = none
+CWARN = -Wall -Wextra -Wstrict-prototypes
+DEFS  = -DGNU_LINUX_EMULATION
+OPT   = -O3 -g
+LIBS  = -lpthread
+
+BFDNAME_OBJ=elf64-x86-64
+BFDARCH=i386:x86-64
+
+#######################
+include $(CHOPSTX)/rules.mk
+
+include $(FRAUCHEKY)/build.mk
+###################################
+
+board.h:
+	@echo Please run configure to have a symbolic link \'board.h\'
+	@exit 1
+
+distclean:: clean
+	-rm -f config.h
--- a/example-fraucheky/board.h
+++ b/example-fraucheky/board.h
@@ -0,0 +1 @@
+../board/board-gnu-linux.h
--- a/example-fraucheky/config.h.in
+++ b/example-fraucheky/config.h.in
@@ -0,0 +1,2 @@
+@FRAUCHEKY_DEFINE@
+@FRAUCHEKY_MSC_DEFINE@
--- a/example-fraucheky/configure
+++ b/example-fraucheky/configure
@@ -0,0 +1,137 @@
+#! /bin/bash
+
+# This is bash which supports ANSI-C Quoting
+nl=$'\n'
+
+# Default settings
+help=no
+vidpid=none
+verbose=no
+debug=no
+with_fraucheky=yes
+with_index=./INDEX.HTM
+
+if test -d ../.git; then
+  REVISION=`git describe --dirty="-modified"`
+  REVISION_CHOPSTX=`cd .. && git describe --dirty="-modified"`
+  REVISION_FRAUCHEKY=`cd ../../fraucheky &&git describe --dirty="-modified"`
+else
+  REVISION=`cat ../VERSION`
+  REVISION_CHOPSTX=`cat ../VERSION`
+  REVISION_FRAUCHEKY=`cat ../../fraucheky/VERSION`
+fi
+
+# Process each option
+for option; do
+  case $option in
+  *=*)	optarg=`expr "X$option" : '[^=]*=\(.*\)'` ;;
+  *)	optarg=yes ;;
+  esac
+
+  case $option in
+  -h | --help)
+    help=yes ;;
+  -v | --verbose)
+    verbose=yes ;;
+  --vidpid=*)
+    vidpid=$optarg ;;
+  *)
+    echo "Unrecognized option \`$option'" >&2
+    echo "Try \`$0 --help' for more information." >&2
+    exit 1
+    ;;
+  esac
+done
+
+if test "$help" = "yes"; then
+  cat <<EOF
+Usage: $0 [OPTION]...
+
+Defaults for the options are specified in brackets.
+
+Configuration:
+  -h, --help		display this help and exit	[no]
+  --vidpid=VID:PID	specify vendor/product ID	[<NONE>]
+  --with-index=INDEX	specify INDEX file		[none]
+EOF
+  exit 0
+fi
+
+if test "$vidpid" = "none"; then
+  echo "Please specify Vendor ID and Product ID by --vidpid option." >&2
+  exit 1
+fi
+
+VIDPID="$vidpid"
+VERSION="0100"
+PRODUCT="Fraucheky"
+VENDOR="Free Software Initiative of Japan"
+SERIALNO="FSIJ-`cat ../VERSION | sed -e 's%^[^/]*/%%'`-"
+
+
+../../fraucheky/configure "$vidpid" $with_index $REVISION $REVISION_CHOPSTX $REVISION_FRAUCHEKY
+
+ENABLE_FRAUCHEKY=""
+FRAUCHEKY_DEFINE="#define FRAUCHEKY_SUPPORT 1"
+FRAUCHEKY_MSC_DEFINE="#define MSC_INTERFACE_NO    2"
+if ! test -f ../../fraucheky/build.mk; then
+  echo "'fraucheky' not found" >&2
+  exit 1
+fi
+
+output_vid_pid_version () {
+  echo $VIDPID | sed -n -e "s%^\([0-9a-f][0-9a-f]\)\([0-9a-f][0-9a-f]\):\([0-9a-f][0-9a-f]\)\([0-9a-f][0-9a-f]\)$%  0x\2, 0x\1, /* idVendor  */\\${nl}  0x\4, 0x\3, /* idProduct */%p"
+  echo $VERSION | sed -n -e "s%^\([0-9a-f][0-9a-f]\)\([0-9a-f][0-9a-f]\)$%  0x\2, 0x\1, /* bcdDevice */%p"
+}
+
+output_vendor_product_serial_strings () {
+  prefix=$1
+
+  echo "static const uint8_t ${prefix}string_vendor[] = {"
+  echo "  ${#VENDOR}*2+2,			/* bLength */"
+  echo "  STRING_DESCRIPTOR,		/* bDescriptorType */"
+  echo "  /* Manufacturer: \"$VENDOR\" */"
+  echo $VENDOR | sed -e "s/\(........\)/\1\\${nl}/g" | sed -n -e "s/\(.\)/'\1', 0, /g" -e "s/^/  /" -e "/^  ./s/ $//p"
+  echo '};'
+  echo
+  echo "static const uint8_t ${prefix}string_product[] = {"
+  echo "  ${#PRODUCT}*2+2,			/* bLength */"
+  echo "  STRING_DESCRIPTOR,		/* bDescriptorType */"
+  echo "  /* Product name: \"$PRODUCT\" */"
+  echo $PRODUCT | sed -e "s/\(........\)/\1\\${nl}/g" | sed -n -e "s/\(.\)/'\1', 0, /g" -e "s/^/  /" -e "/^  ./s/ $//p"
+  echo '};'
+
+  if test -n "$prefix"; then
+  echo
+  echo "static uint8_t ${prefix}string_serial[] = {"
+  echo "  ${#SERIALNO}*2+2+16,			/* bLength */"
+  echo "  STRING_DESCRIPTOR,    	/* bDescriptorType */"
+  echo "  /* Serial number: \"$SERIALNO\" */"
+  echo $SERIALNO | sed -e "s/\(........\)/\1\\${nl}/g" | sed -n -e "s/\(.\)/'\1', 0, /g" -e "s/^/  /" -e "/^  ./s/ $//p"
+  echo "  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,"
+  echo "  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,"
+  echo '};'
+  echo
+  echo "static const uint8_t ${prefix}revision_detail[] = {"
+  echo "  ${#REVISION}*2+2,			/* bLength */"
+  echo "  STRING_DESCRIPTOR,    	/* bDescriptorType */"
+  echo "  /* revision detail: \"$REVISION\" */"
+  echo $REVISION | sed -e "s/\(........\)/\1\\${nl}/g" | sed -n -e "s/\(.\)/'\1', 0, /g" -e "s/^/  /" -e "/^  ./s/ $//p"
+  echo '};'
+  echo
+  echo "static const uint8_t ${prefix}config_options[] = {"
+  echo "  ${#CONFIG}*2+2,			/* bLength */"
+  echo "  STRING_DESCRIPTOR,    	/* bDescriptorType */"
+  echo "  /* configure options: \"$CONFIG\" */"
+  echo $CONFIG | sed -e "s/\(........\)/\1\\${nl}/g" | sed -n -e "s/\(.\)/'\1', 0, /g" -e "s/^/  /" -e "/^  ./s/ $//p"
+  echo '};'
+  fi
+}
+
+output_vid_pid_version > fraucheky-vid-pid-ver.c.inc
+output_vendor_product_serial_strings >fraucheky-usb-strings.c.inc
+
+sed -e "s/@FRAUCHEKY_DEFINE@/$FRAUCHEKY_DEFINE/" \
+    -e "s/@FRAUCHEKY_MSC_DEFINE@/$FRAUCHEKY_MSC_DEFINE/" \
+	< config.h.in > config.h
+exit 0
--- a/example-fraucheky/main.c
+++ b/example-fraucheky/main.c
@@ -0,0 +1,320 @@
+#include <stdint.h>
+#include <string.h>
+#include <signal.h>
+#include <chopstx.h>
+
+#include "config.h"
+#include "usb_lld.h"
+
+#define NUM_INTERFACES 1
+#define FEATURE_BUS_POWERED	0x80
+
+static chopstx_mutex_t usb_mtx;
+static chopstx_cond_t usb_cnd;
+static uint32_t bDeviceState = UNCONNECTED; /* USB device status */
+
+extern void EP6_IN_Callback (uint16_t len);
+extern void EP6_OUT_Callback (uint16_t len);
+
+#define MSC_MASS_STORAGE_RESET_COMMAND 0xFF
+extern int fraucheky_enabled (void);
+extern void fraucheky_main (void);
+
+extern void fraucheky_setup_endpoints_for_interface (struct usb_dev *dev, int stop);
+extern int fraucheky_setup (struct usb_dev *dev);
+extern int fraucheky_get_descriptor (struct usb_dev *dev);
+
+static void
+setup_endpoints_for_interface (struct usb_dev *dev, uint16_t interface, int stop)
+{
+  if (interface == 0)
+    fraucheky_setup_endpoints_for_interface (dev, stop);
+}
+
+static void
+usb_device_reset (struct usb_dev *dev)
+{
+  int i;
+
+  usb_lld_reset (dev, FEATURE_BUS_POWERED);
+
+  /* Initialize Endpoint 0.  */
+  usb_lld_setup_endp (dev, ENDP0, 1, 1);
+
+  /* Stop the interface */
+  for (i = 0; i < NUM_INTERFACES; i++)
+    setup_endpoints_for_interface (dev, i, 1);
+
+  /* Notify upper layer.  */
+  chopstx_mutex_lock (&usb_mtx);
+  bDeviceState = ATTACHED;
+  chopstx_cond_signal (&usb_cnd);
+  chopstx_mutex_unlock (&usb_mtx);
+}
+
+static void
+usb_ctrl_write_finish (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
+
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0
+	   && USB_SETUP_SET (arg->type))
+    {
+      if (arg->request == MSC_MASS_STORAGE_RESET_COMMAND)
+	fraucheky_setup_endpoints_for_interface (dev, 0);
+    }
+}
+
+static int
+usb_setup (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
+
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT)
+      && arg->index == 0)
+    return fraucheky_setup (dev);
+
+  return -1;
+}
+
+static int
+usb_set_configuration (struct usb_dev *dev)
+{
+  int i;
+  uint8_t current_conf;
+
+  current_conf = usb_lld_current_configuration (dev);
+  if (current_conf == 0)
+    {
+      if (dev->dev_req.value != 1)
+	return -1;
+
+      usb_lld_set_configuration (dev, 1);
+      for (i = 0; i < NUM_INTERFACES; i++)
+	setup_endpoints_for_interface (dev, i, 0);
+      chopstx_mutex_lock (&usb_mtx);
+      bDeviceState = CONFIGURED;
+      chopstx_mutex_unlock (&usb_mtx);
+    }
+  else if (current_conf != dev->dev_req.value)
+    {
+      if (dev->dev_req.value != 0)
+	return -1;
+
+      usb_lld_set_configuration (dev, 0);
+      for (i = 0; i < NUM_INTERFACES; i++)
+	setup_endpoints_for_interface (dev, i, 1);
+      chopstx_mutex_lock (&usb_mtx);
+      bDeviceState = ADDRESSED;
+      chopstx_cond_signal (&usb_cnd);
+      chopstx_mutex_unlock (&usb_mtx);
+    }
+
+  /* Do nothing when current_conf == value */
+  return usb_lld_ctrl_ack (dev);
+}
+
+
+static int
+usb_set_interface (struct usb_dev *dev)
+{
+  uint16_t interface = dev->dev_req.index;
+  uint16_t alt = dev->dev_req.value;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  if (alt != 0)
+    return -1;
+  else
+    {
+      setup_endpoints_for_interface (dev, interface, 0);
+      return usb_lld_ctrl_ack (dev);
+    }
+}
+
+static int
+usb_get_interface (struct usb_dev *dev)
+{
+  const uint8_t zero = 0;
+  uint16_t interface = dev->dev_req.index;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  return usb_lld_ctrl_send (dev, &zero, 1);
+}
+
+
+static int
+usb_get_status_interface (struct usb_dev *dev)
+{
+  const uint16_t status_info = 0;
+  uint16_t interface = dev->dev_req.index;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  return usb_lld_ctrl_send (dev, &status_info, 2);
+}
+
+static void usb_tx_done (uint8_t ep_num, uint16_t len);
+static void usb_rx_ready (uint8_t ep_num, uint16_t len);
+
+
+#define INTR_REQ_USB SIGUSR1
+#define PRIO_USB 3
+
+static void *
+usb_main (void *arg)
+{
+  chopstx_intr_t interrupt;
+  struct usb_dev dev;
+  int e;
+
+  (void)arg;
+  chopstx_claim_irq (&interrupt, INTR_REQ_USB);
+  usb_lld_init (&dev, FEATURE_BUS_POWERED);
+  goto event_handle;	/* For old SYS < 3.0 */
+
+  while (1)
+    {
+      chopstx_intr_wait (&interrupt);
+
+      if (interrupt.ready)
+	{
+	  uint8_t ep_num;
+
+	event_handle:
+	  e = usb_lld_event_handler (&dev);
+	  ep_num = USB_EVENT_ENDP (e);
+
+	  if (ep_num != 0)
+	    {
+	      if (USB_EVENT_TXRX (e))
+		usb_tx_done (ep_num, USB_EVENT_LEN (e));
+	      else
+		usb_rx_ready (ep_num, USB_EVENT_LEN (e));
+	    }
+	  else
+	    switch (USB_EVENT_ID (e))
+	      {
+	      case USB_EVENT_DEVICE_RESET:
+		usb_device_reset (&dev);
+		continue;
+
+	      case USB_EVENT_DEVICE_ADDRESSED:
+		chopstx_mutex_lock (&usb_mtx);
+		bDeviceState = ADDRESSED;
+		chopstx_cond_signal (&usb_cnd);
+		chopstx_mutex_unlock (&usb_mtx);
+		continue;
+
+	      case USB_EVENT_GET_DESCRIPTOR:
+		if (fraucheky_get_descriptor (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_CONFIGURATION:
+		if (usb_set_configuration (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_INTERFACE:
+		if (usb_set_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_REQUEST:
+		/* Device specific device request.  */
+		if (usb_setup (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_STATUS_INTERFACE:
+		if (usb_get_status_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_INTERFACE:
+		if (usb_get_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_FEATURE_DEVICE:
+	      case USB_EVENT_SET_FEATURE_ENDPOINT:
+	      case USB_EVENT_CLEAR_FEATURE_DEVICE:
+	      case USB_EVENT_CLEAR_FEATURE_ENDPOINT:
+		usb_lld_ctrl_ack (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_WRITE_FINISH:
+		/* Control WRITE transfer finished.  */
+		usb_ctrl_write_finish (&dev);
+		continue;
+
+	      case USB_EVENT_OK:
+	      case USB_EVENT_DEVICE_SUSPEND:
+	      default:
+		continue;
+	      }
+	}
+    }
+
+  return NULL;
+}
+
+static void
+usb_tx_done (uint8_t ep_num, uint16_t len)
+{
+  if (ep_num == ENDP6)
+    EP6_IN_Callback (len);
+}
+
+static void
+usb_rx_ready (uint8_t ep_num, uint16_t len)
+{
+  if (ep_num == ENDP6)
+    EP6_OUT_Callback (len);
+}
+
+static char __process3_stack_base__[4096];
+
+#define STACK_ADDR_USB ((uintptr_t)__process3_stack_base__)
+#define STACK_SIZE_USB (sizeof __process3_stack_base__)
+
+#ifdef GNU_LINUX_EMULATION
+#define main emulated_main
+#endif
+
+/*
+ * Entry point.
+ *
+ * NOTE: the main function is already a thread in the system on entry.
+ */
+int
+main (int argc, char **argv)
+{
+  chopstx_t usb_thd;
+
+  (void)argc;
+  (void)argv;
+
+  chopstx_mutex_init (&usb_mtx);
+  chopstx_cond_init (&usb_cnd);
+
+  bDeviceState = UNCONNECTED;
+  usb_thd = chopstx_create (PRIO_USB, STACK_ADDR_USB, STACK_SIZE_USB,
+			    usb_main, NULL);
+  while (bDeviceState != CONFIGURED)
+    chopstx_usec_wait (250*1000);
+  fraucheky_main ();
+  chopstx_cancel (usb_thd);
+  chopstx_join (usb_thd, NULL);
+  usb_lld_shutdown ();
+  bDeviceState = UNCONNECTED;
+
+  return 0;
+}
--- a/example-fs-bb48/Makefile
+++ b/example-fs-bb48/Makefile
@@ -0,0 +1,36 @@
+# Makefile for example application of Chopstx
+
+PROJECT = sample
+
+### Currently, it's for FS-BB48.
+
+CHOPSTX = ..
+LDSCRIPT= sample.ld
+CSRC = sample.c usb-cdc.c command.c touch.c
+CHIP=mkl27z
+
+USE_SYS = yes
+USE_USB = yes
+USE_ADC = yes
+
+###################################
+CROSS = arm-none-eabi-
+CC   = $(CROSS)gcc
+LD   = $(CROSS)gcc
+OBJCOPY   = $(CROSS)objcopy
+
+MCU   = cortex-m0plus
+CWARN = -Wall -Wextra -Wstrict-prototypes
+DEFS  = -DFREE_STANDING -DMHZ=48 -DUSE_SYS3
+OPT   = -O3 -Os -g
+LIBS  =
+
+####################
+include ../rules.mk
+
+board.h:
+	@echo Please make a symbolic link \'board.h\' to a file in ../board;
+	@exit 1
+
+distclean: clean
+	rm -f board.h
--- a/example-fs-bb48/board.h
+++ b/example-fs-bb48/board.h
@@ -0,0 +1 @@
+../board/board-fs-bb48.h
--- a/example-fs-bb48/command.c
+++ b/example-fs-bb48/command.c
@@ -0,0 +1,542 @@
+#include <string.h>
+#include <stdint.h>
+#include <chopstx.h>
+#include "tty.h"
+#include "config.h"
+#ifdef ADC_SUPPORT
+#include "adc.h"
+static int adc_initialized = 0;
+#endif
+#include "board.h"
+#include "sys.h"
+
+struct command_table
+{
+  const char *name;
+  void (*handler) (struct tty *tty, const char *line);
+};
+
+/*
+ * Put a line (or lines) to TTY.
+ * LINE should be terminated with newline.
+ */
+static void
+put_line (struct tty *tty, const char *line)
+{
+  tty_send (tty, line, strlen (line));
+}
+
+static const char *help_string = 
+  "mdw ADDR [COUNT];       memory display word\r\n"
+  "mww ADDR VALUE [COUNT]; memory write word\r\n"
+  "fes ADDR [COUNT];       flash erase sector\r\n"
+  "fww ADDR VALUE [COUNT]; flash write word\r\n"
+#ifdef CRC32_SUPPORT
+  "crc32 string;           CRC32 calc string\r\n"
+#endif
+#ifdef ADC_SUPPORT
+  "adc;                    get 256-byte from ADC\r\n"
+#endif
+  "sysinfo;                system information\r\n"
+  "help\r\n";
+
+static char hexchar (uint8_t x)
+{
+  x &= 0x0f;
+  if (x <= 0x09)
+    return '0' + x;
+  else if (x <= 0x0f)
+    return 'a' + x - 10;
+  else
+    return '?';
+}
+
+static char *
+compose_decimal (char *s, int value)
+{
+  uint32_t v;
+  int col = 1000000000;
+  int d;
+  int digit_output = 0;
+
+  if (value < 0)
+    {
+      *s++ = '-';
+      v = 1 + ~((uint32_t)value);
+    }
+  else
+    v = (uint32_t)value;
+
+  while (col >= 10)
+    {
+      if (v >= (uint32_t)col)
+	{
+	  d = v / col;
+	  v = v - d * col;
+	  *s++ = d + '0';
+	  digit_output = 1;
+	}
+      else if (digit_output)
+	*s++ = '0';
+
+      col = col / 10;
+    }
+
+  *s++ = v + '0';
+
+  return s;
+}
+
+
+static char *
+compose_hex (char *s, uint32_t v)
+{
+  s[0] = hexchar (v >> 28);
+  s[1] = hexchar (v >> 24);
+  s[2] = hexchar (v >> 20);
+  s[3] = hexchar (v >> 16);
+  s[4] = hexchar (v >> 12);
+  s[5] = hexchar (v >> 8);
+  s[6] = hexchar (v >> 4);
+  s[7] = hexchar (v);
+  return s+8;
+}
+
+static const char *
+get_hex (struct tty *tty, const char *s, uint32_t *v_p)
+{
+  uint32_t v = 0;
+  char c;
+
+  if (s[0] == '0' && s[1] == 'x')
+    s = s + 2;
+  while (1)
+    {
+      c = *s++;
+
+      if (c == 0)
+	{
+	  s--;
+	  break;
+	}
+
+      if (c == ' ')
+	break;
+
+      v = (v << 4);
+      if (c >= '0' && c <= '9')
+	v += (c - '0');
+      else if (c >= 'a' && c <= 'f')
+	v += (c - 'a') + 10;
+      else if (c >= 'A' && c <= 'F')
+	v += (c - 'A') + 10;
+      else
+	{
+	  put_line (tty, "hex error\r\n");
+	  return NULL;
+	}
+    }
+
+  *v_p = v;
+  return s;
+}
+
+
+#define TOUCH_VALUE_HIGH 100
+#define TOUCH_VALUE_LOW  50
+static void
+cmd_button (struct tty *tty, const char *line)
+{
+  int i = 0;
+  extern uint16_t touch_get (void);
+  uint16_t v0 = 0;
+  int touched = 0;
+
+  (void)line;
+  put_line (tty, "Please touch the bear.\r\n");
+
+  while (i < 16)
+    {
+      uint16_t v = touch_get ();
+      v0 = (v0 * 2 + v)/3;
+
+      if (touched == 0 && v0 > TOUCH_VALUE_HIGH)
+	{
+	  tty_send (tty, "!", 1);
+	  touched = 1;
+	}
+      else if (touched == 1 && v0 < TOUCH_VALUE_LOW)
+	{
+	  tty_send (tty, ".", 1);
+	  touched = 0;
+	  i++;
+	}
+
+      chopstx_usec_wait (10*1000);
+    }
+
+  tty_send (tty, "\r\n", 2);
+}
+
+
+static void
+cmd_touch (struct tty *tty, const char *line)
+{
+  int i;
+  extern uint16_t touch_get (void);
+
+  (void)line;
+  put_line (tty, "Please touch the bear.\r\n");
+
+  for (i = 0; i < 20; i++)
+    {
+      uint16_t v;
+      char output[8];
+      char *s;
+
+      chopstx_usec_wait (1000*1000);
+      v = touch_get ();
+      s = compose_decimal (output, v);
+      *s++ = '\r';
+      *s++ = '\n';
+      tty_send (tty, output, s - output);
+    }
+}
+
+
+static void
+cmd_mdw (struct tty *tty, const char *line)
+{
+  int i;
+  uint32_t addr = 0;
+  int count = 0;
+  char c;
+  const char *s = line;
+  
+  s = get_hex (tty, s, &addr);
+  addr &= ~3;
+  if (s == NULL)
+    return;
+
+  if (*s == 0)
+    count = 1;
+  else
+    {
+      while (1)
+	{
+	  c = *s++;
+
+	  if (c == 0 || c == ' ')
+	    break;
+
+	  count = count * 10;
+	  if (c >= '0' && c <= '9')
+	    count += c - '0';
+	  else
+	    {
+	      put_line (tty, "mdw error\r\n");
+	      return;
+	    }
+	}
+    }
+
+  i = 0;
+  while (i < count)
+    {
+      uint32_t v;
+      char output[48];
+      char *s;
+
+      s = compose_hex (output, addr);
+      *s++ = ':';
+      *s++ = ' ';
+
+      while (1)
+	{
+	  v = *(uint32_t *)addr;
+	  s = compose_hex (s, v);
+	  i++;
+	  addr += 4;
+	  if (i >= count || (i % 4) == 0)
+	    break;
+	  *s++ = ' ';
+	}
+
+      *s++ = '\r';
+      *s++ = '\n';
+      tty_send (tty, output, s - output);
+    }
+}
+
+static void
+cmd_mww (struct tty *tty, const char *line)
+{
+  (void)tty;
+  (void)line;
+  put_line (tty, "mww not yet supported\r\n");
+}
+
+static void
+cmd_fes (struct tty *tty, const char *line)
+{
+  int i;
+  uint32_t addr = 0;
+  int count = 0;
+  char c;
+  const char *s = line;
+  
+  s = get_hex (tty, s, &addr);
+  if (s == NULL)
+    return;
+
+  if (*s == 0)
+    count = 1;
+  else
+    {
+      while (1)
+	{
+	  c = *s++;
+
+	  if (c == 0 || c == ' ')
+	    break;
+
+	  count = count * 10;
+	  if (c >= '0' && c <= '9')
+	    count += c - '0';
+	  else
+	    {
+	      put_line (tty, "fww error\r\n");
+	      return;
+	    }
+	}
+    }
+
+  for (i = 0; i < count; i++)
+    {
+      flash_erase_page (addr);
+      addr += 1024;
+    }
+}
+
+static void
+cmd_fww (struct tty *tty, const char *line)
+{
+  int i;
+  uint32_t addr = 0;
+  uint32_t value = 0;
+  int count = 0;
+  char c;
+  const char *s = line;
+  
+  s = get_hex (tty, s, &addr);
+  if (s == NULL)
+    return;
+
+  if (*s == 0)
+    return;
+
+  s = get_hex (tty, s, &value);
+  if (s == NULL)
+    return;
+
+  if (*s == 0)
+    count = 1;
+  else
+    {
+      while (1)
+	{
+	  c = *s++;
+
+	  if (c == 0 || c == ' ')
+	    break;
+
+	  count = count * 10;
+	  if (c >= '0' && c <= '9')
+	    count += c - '0';
+	  else
+	    {
+	      put_line (tty, "fww error\r\n");
+	      return;
+	    }
+	}
+    }
+
+  for (i = 0; i < count; i++)
+    {
+      flash_program_word (addr, value);
+      addr += 4;
+    }
+}
+
+
+#ifdef CRC32_SUPPORT
+static unsigned int crc_value;
+
+static void
+cmd_crc32  (struct tty *tty, const char *line)
+{
+  uint32_t v;
+  char string[10];
+  char *s;
+
+  crc32_init (&crc_value);
+  while (*line)
+    crc32_u8 (&crc_value, *line++);
+  v = crc_value ^ 0xffffffff;
+
+  s = compose_hex (string, v);
+  *s++ = '\r';
+  *s++ = '\n';
+  tty_send (tty, string, sizeof (string));
+}
+#endif
+
+#ifdef ADC_SUPPORT
+static void
+cmd_adc  (struct tty *tty, const char *line)
+{
+  int i;
+  char output[73];
+  char *s;
+
+  (void)line;
+
+  if (!adc_initialized)
+    {
+      if (adc_init ())
+	{
+	  put_line (tty, "adc_init error\r\n");
+	  return;
+	}
+      else
+	{
+	  adc_start ();
+	  adc_initialized = 1;
+	}
+    }
+
+  adc_start_conversion (0, 64);
+  adc_wait_completion ();
+
+  i = 0;
+  s = output;
+  while (1)
+    {
+      s = compose_hex (s, adc_buf[i]);
+      i++;
+      if ((i % 8))
+	*s++ = ' ';
+      else
+	{
+	  *s++ = '\r';
+	  *s++ = '\n';
+	  tty_send (tty, output, s - output);
+	  s = output;
+	  if (i >= 64)
+	    break;
+	}
+    }
+}
+#endif
+
+static void
+cmd_sysinfo (struct tty *tty, const char *line)
+{
+  char output[73];
+  char *s;
+  int i;
+
+  (void)line;
+  memcpy (output, "SYS version: ", 13);
+  s = output + 13; 
+  *s++ = sys_version[2];
+  *s++ = sys_version[4];
+  *s++ = sys_version[6];
+  *s++ = '\r';
+  *s++ = '\n';
+  tty_send (tty, output, s - output);
+
+  memcpy (output, "Board ID: ", 10);
+  s = output + 10; 
+  s = compose_hex (s, sys_board_id);
+  *s++ = '\r';
+  *s++ = '\n';
+  tty_send (tty, output, s - output);
+
+  memcpy (output, "Board name: ", 12);
+  s = output + 12; 
+  for (i = 0; i < (int)sizeof (output) - 2; i ++)
+    if ((*s = sys_board_name[i]) == 0)
+      break;
+    else
+      s++;
+
+  *s++ = '\r';
+  *s++ = '\n';
+  tty_send (tty, output, s - output);
+}
+
+
+static void
+cmd_help (struct tty *tty, const char *line)
+{
+  (void)line;
+  put_line (tty, help_string);
+}
+
+
+struct command_table command_table[] = {
+  { "button", cmd_button },
+  { "touch", cmd_touch },
+  { "mdw", cmd_mdw },
+  { "mww", cmd_mww },
+  { "fes", cmd_fes },
+  { "fww", cmd_fww },
+#ifdef CRC32_SUPPORT
+  { "crc32", cmd_crc32 },
+#endif
+#ifdef ADC_SUPPORT
+  { "adc", cmd_adc },
+#endif
+  { "sysinfo", cmd_sysinfo },
+  { "help", cmd_help },
+};
+
+#define N_CMDS (int)(sizeof (command_table) / sizeof (struct command_table))
+
+
+/*
+ * Dispatch a command parsing LINE.
+ * Line is NULL terminated with no newline.
+ */
+void
+cmd_dispatch (struct tty *tty, const char *line)
+{
+  int i;
+  const char *p;
+  unsigned int n = 0;
+
+  p = line;
+  while (*p)
+    {
+      if (*p++ == ' ')
+	break;
+      n++;
+    }
+
+  for (i = 0; i < N_CMDS; i++)
+    if (n == strlen (command_table[i].name)
+	&& strncmp ((const char *)line, command_table[i].name, n) == 0)
+      break;
+
+  if (i != N_CMDS)
+    (*command_table[i].handler) (tty, p);
+  else
+    {
+      char crlf[] = { '\r', '\n' };
+
+      put_line (tty, "No such command: ");
+      tty_send (tty, line, n);
+      tty_send (tty, crlf, sizeof (crlf));
+    }
+}
--- a/example-fs-bb48/command.h
+++ b/example-fs-bb48/command.h
@@ -0,0 +1 @@
+void cmd_dispatch (struct tty *tty, const char *line);
--- a/example-fs-bb48/config.h
+++ b/example-fs-bb48/config.h
@@ -0,0 +1,2 @@
+#define CRC32_SUPPORT
+#define ADC_SUPPORT
--- a/example-fs-bb48/crc32.c
+++ b/example-fs-bb48/crc32.c
@@ -0,0 +1,22 @@
+const unsigned int *const crc32_table= (const unsigned int *)0x00000480;
+
+void
+crc32_init (unsigned int *p)
+{
+  *p = 0xffffffff;
+}
+
+static void
+crc32_u8 (unsigned int *p, unsigned char v)
+{
+  *p = crc32_table[(*p & 0xff) ^ v] ^ (*p >> 8);
+}
+
+void
+crc32_u32 (unsigned int *p, unsigned int u)
+{
+  crc32_u8 (p, u & 0xff);
+  crc32_u8 (p, (u >> 8)& 0xff);
+  crc32_u8 (p, (u >> 16)& 0xff);
+  crc32_u8 (p, (u >> 24)& 0xff);
+}
--- a/example-fs-bb48/gen_crc_table.py
+++ b/example-fs-bb48/gen_crc_table.py
@@ -0,0 +1,22 @@
+# 
+# Polynomial for CRC32:
+#    x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1
+#
+# When it is represented in binary, it's:
+#    0x04C11DB7
+#    =
+#    0000 0100 1100 0001 0001 1101 1011 0111
+# 
+# When we put in reverse bit-order, it's
+#    0xedb88320
+
+for i in range(0,256):
+    c = i
+    for j in range(0,8):
+        if (c&1):
+            c = 0xEDB88320 ^ (c >> 1)
+        else:
+            c = c >> 1
+    print("0x%08x," % c),
+    if (i % 6) == 5:
+        print("")
--- a/example-fs-bb48/sample.c
+++ b/example-fs-bb48/sample.c
@@ -0,0 +1,189 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <chopstx.h>
+
+#include "usb_lld.h"
+#include "tty.h"
+#include "board.h"
+#include "command.h"
+#include <sys.h>
+
+static chopstx_mutex_t mtx;
+static chopstx_cond_t cnd0;
+static chopstx_cond_t cnd1;
+
+uint8_t u;
+static uint8_t v;
+static uint8_t m;		/* 0..100 */
+
+static void
+wait_for (uint32_t usec)
+{
+#if defined(BUSY_LOOP)
+  uint32_t count = usec * 6;
+  uint32_t i;
+
+  for (i = 0; i < count; i++)
+    asm volatile ("" : : "r" (i) : "memory");
+#else
+  chopstx_usec_wait (usec);
+#endif
+}
+
+static void *
+pwm (void *arg)
+{
+  (void)arg;
+
+  chopstx_mutex_lock (&mtx);
+  chopstx_cond_wait (&cnd0, &mtx);
+  chopstx_mutex_unlock (&mtx);
+
+  while (1)
+    {
+      set_led (u&v);
+      wait_for (m);
+      set_led (0);
+      wait_for (100-m);
+    }
+
+  return NULL;
+}
+
+static void *
+blk (void *arg)
+{
+  (void)arg;
+
+  chopstx_mutex_lock (&mtx);
+  chopstx_cond_wait (&cnd1, &mtx);
+  chopstx_mutex_unlock (&mtx);
+
+  while (1)
+    {
+      v = 0;
+      wait_for (200*1000);
+      v = 1;
+      wait_for (200*1000);
+    }
+
+  return NULL;
+}
+
+
+#define PRIO_PWM 3
+#define PRIO_BLK 2
+
+extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
+extern uint8_t __process2_stack_base__[], __process2_stack_size__[];
+
+#define STACK_ADDR_PWM ((uint32_t)__process1_stack_base__)
+#define STACK_SIZE_PWM ((uint32_t)__process1_stack_size__)
+
+#define STACK_ADDR_BLK ((uint32_t)__process2_stack_base__)
+#define STACK_SIZE_BLK ((uint32_t)__process2_stack_size__)
+
+
+static char hexchar (uint8_t x)
+{
+  x &= 0x0f;
+  if (x <= 0x09)
+    return '0' + x;
+  else if (x <= 0x0f)
+    return 'a' + x - 10;
+  else
+    return '?';
+}
+
+
+extern void touch_init (void);
+
+int
+main (int argc, const char *argv[])
+{
+  struct tty *tty;
+  uint8_t count;
+
+  (void)argc;
+  (void)argv;
+
+  chopstx_mutex_init (&mtx);
+  chopstx_cond_init (&cnd0);
+  chopstx_cond_init (&cnd1);
+
+  m = 10;
+
+  chopstx_create (PRIO_PWM, STACK_ADDR_PWM, STACK_SIZE_PWM, pwm, NULL);
+  chopstx_create (PRIO_BLK, STACK_ADDR_BLK, STACK_SIZE_BLK, blk, NULL);
+
+  chopstx_usec_wait (200*1000);
+
+  chopstx_mutex_lock (&mtx);
+  chopstx_cond_signal (&cnd0);
+  chopstx_cond_signal (&cnd1);
+  chopstx_mutex_unlock (&mtx);
+
+  u = 1;
+
+  touch_init ();
+
+  tty = tty_open ();
+  tty_wait_configured (tty);
+
+  count = 0;
+  m = 50;
+  while (1)
+    {
+      char s[LINEBUFSIZE];
+
+    connection_loop:
+      u = 1;
+      tty_wait_connection (tty);
+
+      chopstx_usec_wait (50*1000);
+
+      /* Send ZLP at the beginning.  */
+      tty_send (tty, s, 0);
+
+      memcpy (s, "xx: Hello, World with Chopstx!\r\n", 32);
+      s[0] = hexchar (count >> 4);
+      s[1] = hexchar (count & 0x0f);
+      count++;
+
+      if (tty_send (tty, s, 32) < 0)
+	continue;
+
+      while (1)
+	{
+	  uint32_t usec;
+
+	  /* Prompt */
+	  if (tty_send (tty, "> ", 2) < 0)
+	    break;
+
+	  usec = 3000000;	/* 3.0 seconds */
+	  while (1)
+	    {
+	      int size = tty_recv (tty, s, &usec);
+	      u ^= 1;
+
+	      if (size < 0)
+		goto connection_loop;
+
+	      if (size == 1)
+		/* Do nothing but prompt again.  */
+		break;
+	      else if (size)
+		{
+		  /* Newline into NUL */
+		  s[size - 1] = 0;
+		  cmd_dispatch (tty, (char *)s);
+		  break;
+		}
+	    }
+	}
+    }
+
+  return 0;
+}
--- a/example-fs-bb48/sample.ld
+++ b/example-fs-bb48/sample.ld
@@ -0,0 +1,150 @@
+/*
+ * MK27Z memory setup.
+ */
+__main_stack_size__      = 0x0100; /* Idle+Exception handlers */
+__process0_stack_size__  = 0x0300; /* Main program            */
+__process1_stack_size__  = 0x0200; /* first thread program    */
+__process2_stack_size__  = 0x0100; /* second thread program   */
+__process3_stack_size__  = 0x0200; /* third thread program    */
+
+MEMORY
+{
+    flash  : org = 0x00000000, len = 256k
+    ram : org = 0x1fffe000, len = 32k
+}
+
+__ram_start__           = ORIGIN(ram);
+__ram_size__            = 32k;
+__ram_end__             = __ram_start__ + __ram_size__;
+
+SECTIONS
+{
+    . = 0;
+
+    _text = .;
+
+    .text : ALIGN(16) SUBALIGN(8)
+    {
+        KEEP(*(.first_page.first_words))
+        KEEP(*(.sys.version))
+        KEEP(*(.sys.board_info))
+        KEEP(*(.sys.vectors))
+	build/sys-*.o(.text)
+	build/sys-*.o(.text.*)
+	build/sys-*.o(.rodata)
+	build/sys-*.o(.rodata.*)
+	. = ALIGN(1024);
+        KEEP(*(.flash_config))
+	KEEP(*(.fixed_function.reset))
+	KEEP(*(.fixed_function.flash_do_internal))
+	KEEP(*(.fixed_function.flash_do))
+	KEEP(*(.fixed_function.flash_erase_page))
+	KEEP(*(.fixed_function.flash_program_word))
+	KEEP(*(.fixed_function.crc32_init))
+	KEEP(*(.fixed_function.crc32_u8))
+	KEEP(*(.fixed_function.crc32_u32))
+	/*
+	 * Because of alignment requirement
+	 * of startup.vectors, align to 256.
+	 */
+	. = ALIGN(256);
+        KEEP(*(.crc32_table))
+        KEEP(*(.startup.vectors))
+	. = ALIGN(16);
+        *(.text.startup.*)
+        *(.text)
+        *(.text.*)
+        *(.rodata)
+        *(.rodata.*)
+        *(.glue_7t)
+        *(.glue_7)
+        *(.gcc*)
+	. = ALIGN(8);
+    } > flash =0xffffffff
+
+    /DISCARD/ :
+    {
+        *(.bss.startup.0)
+    }
+
+    .ARM.extab : {*(.ARM.extab* .gnu.linkonce.armextab.*)} > flash
+
+    .ARM.exidx : {
+        PROVIDE(__exidx_start = .);
+        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+        PROVIDE(__exidx_end = .);
+     } > flash =0xffffffff
+
+    .eh_frame_hdr : {*(.eh_frame_hdr)} > flash
+
+    .eh_frame : ONLY_IF_RO {*(.eh_frame)} > flash
+
+    .textalign : ONLY_IF_RO { . = ALIGN(8); } > flash
+
+    _etext = .;
+    _textdata = _etext;
+
+    .process_stack :
+    {
+        . = ALIGN(8);
+        __process3_stack_base__ = .;
+        . += __process3_stack_size__;
+        . = ALIGN(8);
+        __process3_stack_end__ = .;
+        __process2_stack_base__ = .;
+        . += __process2_stack_size__;
+        . = ALIGN(8);
+        __process2_stack_end__ = .;
+        __process1_stack_base__ = .;
+        . += __process1_stack_size__;
+        . = ALIGN(8);
+        __process1_stack_end__ = .;
+        __process0_stack_base__ = .;
+        . += __process0_stack_size__;
+        . = ALIGN(8);
+        __process0_stack_end__ = .;
+    } > ram
+
+    .main_stack :
+    {
+        . = ALIGN(8);
+        __main_stack_base__ = .;
+        . += __main_stack_size__;
+        . = ALIGN(8);
+        __main_stack_end__ = .;
+    } > ram
+
+    .data :
+    {
+        . = ALIGN(4);
+        PROVIDE(_data = .);
+        *(.data)
+        . = ALIGN(4);
+        *(.data.*)
+        . = ALIGN(4);
+        *(.ramtext)
+        . = ALIGN(4);
+        PROVIDE(_edata = .);
+    } > ram AT > flash =0xffffffff
+
+    .bss :
+    {
+        . = ALIGN(4);
+        PROVIDE(_bss_start = .);
+        *(.bss)
+        . = ALIGN(4);
+        *(.bss.*)
+        . = ALIGN(4);
+        *(COMMON)
+        . = ALIGN(512);
+	__usb_bdt__ = .;
+        . += 512;
+        PROVIDE(_bss_end = .);
+    } > ram
+
+    PROVIDE(end = .);
+    _end            = .;
+}
+
+__heap_base__   = _end;
+__heap_end__    = __ram_end__;
--- a/example-fs-bb48/touch.c
+++ b/example-fs-bb48/touch.c
@@ -0,0 +1,98 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <chopstx.h>
+#include <mcu/mkl27z.h>
+
+struct TPM {
+  volatile uint32_t SC;
+  volatile uint32_t CNT;
+  volatile uint32_t MOD;
+  volatile uint32_t C0SC;
+  volatile uint32_t C0V;
+  volatile uint32_t C1SC;
+  volatile uint32_t C1V;
+  uint32_t rsvd0[13];
+  volatile uint32_t STATUS;
+  uint32_t rsvd1[7];
+  volatile uint32_t POL;
+  uint32_t rsvd2[4];
+  volatile uint32_t CONF;
+};
+
+static struct TPM *const TPM1 = (struct TPM *)0x40039000;
+
+static chopstx_intr_t tpm1_intr;
+#define INTR_REQ_TPM1 18
+
+static void
+gpio_assert_low (void)
+{
+  /* Assert LOW.  */ 
+  PORTB->PCR1 = (1<<8) /* GPIO                  */
+              | (0<<6) /* DriveStrengthEnable=0 */
+              | (0<<4) /* PassiveFilterEnable=0 */
+              | (1<<2) /* SlewRateEnable = slow */
+              | (0<<1) /* pull enable = 0       */ 
+              | (0<<0) /* pull up select= 0         */
+              ;
+
+  GPIOB->PCOR = (1 << 1);            /* PTB1: Clear: Output 0  */
+}
+
+uint16_t
+touch_get (void)
+{
+  chopstx_prio_t prio_old;
+  uint16_t v;
+
+  prio_old = chopstx_setpriority (CHOPSTX_PRIO_INHIBIT_PREEMPTION);
+  /* 
+   * Start the timer's counter. 
+   * TOF clear, TOIE=1, CPWMS=0, CMOD=1, PS=011.
+   */
+  TPM1->SC = 0xcb;
+
+  /* Let the register to pull it up.  */
+  PORTB->PCR1 = (3<<8) /* TPM1_CH1              */
+              | (0<<6) /* DriveStrengthEnable=0 */
+              | (0<<4) /* PassiveFilterEnable=0 */
+              | (1<<2) /* SlewRateEnable = slow */
+              | (0<<1) /* pull enable = 0       */ 
+              | (0<<0) /* pullup select= 0      */
+              ;
+
+  chopstx_setpriority (prio_old);
+
+  chopstx_intr_wait (&tpm1_intr);
+  gpio_assert_low ();
+
+  v = TPM1->C1V;
+
+  /* Clear overflow and CH1 capture.  */
+  TPM1->STATUS = 0x102;
+  /* Stop the timer.  */
+  TPM1->SC = 0;
+  TPM1->CNT = 0xffff;	   /* Writing causes reset of the counter.  */
+
+  return v;
+}
+
+
+void
+touch_init (void)
+{
+  chopstx_claim_irq (&tpm1_intr, INTR_REQ_TPM1);
+
+  /* Input capture mode: MSB = 0, MSA = 0 */
+  /*   Rising edge: ELSB=0 ELSA=1 */
+  TPM1->C1SC = 0x84;
+  TPM1->POL=0;
+
+  /* No trigger.   */
+  /* Stop on overflow: CSOO=1 */ 
+  /* Run the timer in the debug mode */
+  TPM1->CONF = 0x000200c0;
+
+  TPM1->CNT = 0xffff;	   /* Writing causes reset of the counter.  */
+  gpio_assert_low ();
+}
--- a/example-fs-bb48/tty.h
+++ b/example-fs-bb48/tty.h
@@ -0,0 +1,9 @@
+#define LINEBUFSIZE 128
+
+struct tty;
+
+struct tty *tty_open (void);
+void tty_wait_configured (struct tty *tty);
+void tty_wait_connection (struct tty *tty);
+int tty_send (struct tty *tty, const char *buf, int count);
+int tty_recv (struct tty *tty, char *buf, uint32_t *timeout);
--- a/example-fs-bb48/usb-cdc.c
+++ b/example-fs-bb48/usb-cdc.c
@@ -0,0 +1,952 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <chopstx.h>
+#include <string.h>
+#include "board.h"
+#include "usb_lld.h"
+#include "tty.h"
+
+static chopstx_intr_t usb_intr;
+
+struct line_coding
+{
+  uint32_t bitrate;
+  uint8_t format;
+  uint8_t paritytype;
+  uint8_t datatype;
+}  __attribute__((packed));
+
+static const struct line_coding line_coding0 = {
+  115200, /* baud rate: 115200    */
+  0x00,   /* stop bits: 1         */
+  0x00,   /* parity:    none      */
+  0x08    /* bits:      8         */
+};
+
+/*
+ * Currently, we only support a single TTY.
+ *
+ * It is possible to extend to support multiple TTYs, for multiple
+ * interfaces.
+ *
+ * In that case, add argument to TTY_OPEN function and
+ * modify TTY_GET function to get the TTY structure.  Functions which
+ * directy accesses TTY0 (usb_device_reset and usb_set_configuration)
+ * should be modified, too.
+ *
+ * Modification of TTY_MAIN thread will be also needed to echo back
+ * input for each TTY, and the thread should run if one of TTY is
+ * opened.
+ */
+
+struct tty {
+  chopstx_mutex_t mtx;
+  chopstx_cond_t cnd;
+  uint8_t inputline[LINEBUFSIZE];   /* Line editing is supported */
+  uint8_t send_buf[LINEBUFSIZE];    /* Sending ring buffer for echo back */
+  uint8_t send_buf0[64];
+  uint8_t recv_buf0[64];
+  uint32_t inputline_len    : 8;
+  uint32_t send_head        : 8;
+  uint32_t send_tail        : 8;
+  uint32_t flag_connected   : 1;
+  uint32_t flag_send_ready  : 1;
+  uint32_t flag_input_avail : 1;
+  uint32_t                  : 2;
+  uint32_t device_state     : 3;     /* USB device status */
+  struct line_coding line_coding;
+};
+
+static struct tty tty0;
+
+/*
+ * Locate TTY structure from interface number or endpoint number.
+ * Currently, it always returns tty0, because we only have the one.
+ */
+static struct tty *
+tty_get (int interface, uint8_t ep_num)
+{
+  struct tty *t = &tty0;
+
+  if (interface >= 0)
+    {
+      if (interface == 0)
+	t = &tty0;
+    }
+  else
+    {
+      if (ep_num == ENDP1 || ep_num == ENDP2 || ep_num == ENDP3)
+	t = &tty0;
+    }
+
+  return t;
+}
+
+
+#define USB_CDC_REQ_SET_LINE_CODING             0x20
+#define USB_CDC_REQ_GET_LINE_CODING             0x21
+#define USB_CDC_REQ_SET_CONTROL_LINE_STATE      0x22
+#define USB_CDC_REQ_SEND_BREAK                  0x23
+
+/* USB Device Descriptor */
+static const uint8_t vcom_device_desc[18] = {
+  18,   /* bLength */
+  DEVICE_DESCRIPTOR,		/* bDescriptorType */
+  0x10, 0x01,			/* bcdUSB = 1.1 */
+  0x02,				/* bDeviceClass (CDC).              */
+  0x00,				/* bDeviceSubClass.                 */
+  0x00,				/* bDeviceProtocol.                 */
+  0x40,				/* bMaxPacketSize.                  */
+  0xFF, 0xFF, /* idVendor  */
+  0x01, 0x00, /* idProduct */
+  0x00, 0x01, /* bcdDevice  */
+  1,				/* iManufacturer.                   */
+  2,				/* iProduct.                        */
+  3,				/* iSerialNumber.                   */
+  1				/* bNumConfigurations.              */
+};
+
+#define VCOM_FEATURE_BUS_POWERED	0x80
+
+/* Configuration Descriptor tree for a CDC.*/
+static const uint8_t vcom_config_desc[67] = {
+  9,
+  CONFIG_DESCRIPTOR,		/* bDescriptorType: Configuration */
+  /* Configuration Descriptor.*/
+  67, 0x00,			/* wTotalLength.                    */
+  0x02,				/* bNumInterfaces.                  */
+  0x01,				/* bConfigurationValue.             */
+  0,				/* iConfiguration.                  */
+  VCOM_FEATURE_BUS_POWERED,	/* bmAttributes.                    */
+  50,				/* bMaxPower (100mA).               */
+  /* Interface Descriptor.*/
+  9,
+  INTERFACE_DESCRIPTOR,
+  0x00,		   /* bInterfaceNumber.                */
+  0x00,		   /* bAlternateSetting.               */
+  0x01,		   /* bNumEndpoints.                   */
+  0x02,		   /* bInterfaceClass (Communications Interface Class,
+		      CDC section 4.2).  */
+  0x02,		   /* bInterfaceSubClass (Abstract Control Model, CDC
+		      section 4.3).  */
+  0x01,		   /* bInterfaceProtocol (AT commands, CDC section
+		      4.4).  */
+  0,	           /* iInterface.                      */
+  /* Header Functional Descriptor (CDC section 5.2.3).*/
+  5,	      /* bLength.                         */
+  0x24,	      /* bDescriptorType (CS_INTERFACE).  */
+  0x00,	      /* bDescriptorSubtype (Header Functional Descriptor). */
+  0x10, 0x01, /* bcdCDC.                          */
+  /* Call Management Functional Descriptor. */
+  5,            /* bFunctionLength.                 */
+  0x24,         /* bDescriptorType (CS_INTERFACE).  */
+  0x01,         /* bDescriptorSubtype (Call Management Functional
+		   Descriptor). */
+  0x03,         /* bmCapabilities (D0+D1).          */
+  0x01,         /* bDataInterface.                  */
+  /* ACM Functional Descriptor.*/
+  4,            /* bFunctionLength.                 */
+  0x24,         /* bDescriptorType (CS_INTERFACE).  */
+  0x02,         /* bDescriptorSubtype (Abstract Control Management
+		   Descriptor).  */
+  0x02,         /* bmCapabilities.                  */
+  /* Union Functional Descriptor.*/
+  5,            /* bFunctionLength.                 */
+  0x24,         /* bDescriptorType (CS_INTERFACE).  */
+  0x06,         /* bDescriptorSubtype (Union Functional
+		   Descriptor).  */
+  0x00,         /* bMasterInterface (Communication Class
+		   Interface).  */
+  0x01,         /* bSlaveInterface0 (Data Class Interface).  */
+  /* Endpoint 2 Descriptor.*/
+  7,
+  ENDPOINT_DESCRIPTOR,
+  ENDP2|0x80,    /* bEndpointAddress.    */
+  0x03,          /* bmAttributes (Interrupt).        */
+  0x08, 0x00,	 /* wMaxPacketSize.                  */
+  0xFF,		 /* bInterval.                       */
+  /* Interface Descriptor.*/
+  9,
+  INTERFACE_DESCRIPTOR, /* bDescriptorType: */
+  0x01,          /* bInterfaceNumber.                */
+  0x00,          /* bAlternateSetting.               */
+  0x02,          /* bNumEndpoints.                   */
+  0x0A,          /* bInterfaceClass (Data Class Interface, CDC section 4.5). */
+  0x00,          /* bInterfaceSubClass (CDC section 4.6). */
+  0x00,          /* bInterfaceProtocol (CDC section 4.7). */
+  0x00,		 /* iInterface.                      */
+  /* Endpoint 3 Descriptor.*/
+  7,
+  ENDPOINT_DESCRIPTOR,		/* bDescriptorType: Endpoint */
+  ENDP3,    /* bEndpointAddress. */
+  0x02,				/* bmAttributes (Bulk).             */
+  0x40, 0x00,			/* wMaxPacketSize.                  */
+  0x00,				/* bInterval.                       */
+  /* Endpoint 1 Descriptor.*/
+  7,
+  ENDPOINT_DESCRIPTOR,		/* bDescriptorType: Endpoint */
+  ENDP1|0x80,			/* bEndpointAddress. */
+  0x02,				/* bmAttributes (Bulk).             */
+  0x40, 0x00,			/* wMaxPacketSize.                  */
+  0x00				/* bInterval.                       */
+};
+
+
+/*
+ * U.S. English language identifier.
+ */
+static const uint8_t vcom_string0[4] = {
+  4,				/* bLength */
+  STRING_DESCRIPTOR,
+  0x09, 0x04			/* LangID = 0x0409: US-English */
+};
+
+static const uint8_t vcom_string1[] = {
+  23*2+2,			/* bLength */
+  STRING_DESCRIPTOR,		/* bDescriptorType */
+  /* Manufacturer: "Flying Stone Technology" */
+  'F', 0, 'l', 0, 'y', 0, 'i', 0, 'n', 0, 'g', 0, ' ', 0, 'S', 0,
+  't', 0, 'o', 0, 'n', 0, 'e', 0, ' ', 0, 'T', 0, 'e', 0, 'c', 0,
+  'h', 0, 'n', 0, 'o', 0, 'l', 0, 'o', 0, 'g', 0, 'y', 0, 
+};
+
+static const uint8_t vcom_string2[] = {
+  14*2+2,			/* bLength */
+  STRING_DESCRIPTOR,		/* bDescriptorType */
+  /* Product name: "Chopstx Sample" */
+  'C', 0, 'h', 0, 'o', 0, 'p', 0, 's', 0, 't', 0, 'x', 0, ' ', 0,
+  'S', 0, 'a', 0, 'm', 0, 'p', 0, 'l', 0, 'e', 0,
+};
+
+/*
+ * Serial Number string.
+ */
+static const uint8_t vcom_string3[28] = {
+  28,				    /* bLength */
+  STRING_DESCRIPTOR,		    /* bDescriptorType */
+  '0', 0,  '.', 0,  '0', 0, '0', 0, /* Version number */
+};
+
+
+#define NUM_INTERFACES 2
+
+
+static void
+usb_device_reset (struct usb_dev *dev)
+{
+  usb_lld_reset (dev, VCOM_FEATURE_BUS_POWERED);
+
+  /* Initialize Endpoint 0 */
+  usb_lld_setup_endp (dev, ENDP0, 1, 1);
+
+  chopstx_mutex_lock (&tty0.mtx);
+  tty0.inputline_len = 0;
+  tty0.send_head = tty0.send_tail = 0;
+  tty0.flag_connected = 0;
+  tty0.flag_send_ready = 1;
+  tty0.flag_input_avail = 0;
+  tty0.device_state = ATTACHED;
+  memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
+  chopstx_mutex_unlock (&tty0.mtx);
+}
+
+
+#define CDC_CTRL_DTR            0x0001
+
+static void
+usb_ctrl_write_finish (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
+
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0
+      && USB_SETUP_SET (arg->type)
+      && arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
+    {
+      struct tty *t = tty_get (arg->index, 0);
+
+      /* Open/close the connection.  */
+      chopstx_mutex_lock (&t->mtx);
+      t->flag_connected = ((arg->value & CDC_CTRL_DTR) != 0);
+      chopstx_cond_signal (&t->cnd);
+      chopstx_mutex_unlock (&t->mtx);
+    }
+}
+
+
+static int
+vcom_port_data_setup (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+
+  if (USB_SETUP_GET (arg->type))
+    {
+      struct tty *t = tty_get (arg->index, 0);
+
+      if (arg->request == USB_CDC_REQ_GET_LINE_CODING)
+	return usb_lld_ctrl_send (dev, &t->line_coding,
+				  sizeof (struct line_coding));
+    }
+  else  /* USB_SETUP_SET (req) */
+    {
+      if (arg->request == USB_CDC_REQ_SET_LINE_CODING
+	  && arg->len == sizeof (struct line_coding))
+	{
+	  struct tty *t = tty_get (arg->index, 0);
+
+	  return usb_lld_ctrl_recv (dev, &t->line_coding,
+				    sizeof (struct line_coding));
+	}
+      else if (arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
+	return usb_lld_ctrl_ack (dev);
+    }
+
+  return -1;
+}
+
+static int
+usb_setup (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
+
+  if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0)
+    return vcom_port_data_setup (dev);
+
+  return -1;
+}
+
+static int
+usb_get_descriptor (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+  uint8_t desc_type = (arg->value >> 8);
+  uint8_t desc_index = (arg->value & 0xff);
+
+  if (rcp != DEVICE_RECIPIENT)
+    return -1;
+
+  if (desc_type == DEVICE_DESCRIPTOR)
+    return usb_lld_ctrl_send (dev,
+			      vcom_device_desc, sizeof (vcom_device_desc));
+  else if (desc_type == CONFIG_DESCRIPTOR)
+    return usb_lld_ctrl_send (dev,
+			      vcom_config_desc, sizeof (vcom_config_desc));
+  else if (desc_type == STRING_DESCRIPTOR)
+    {
+      const uint8_t *str;
+      int size;
+
+      switch (desc_index)
+	{
+	case 0:
+	  str = vcom_string0;
+	  size = sizeof (vcom_string0);
+	  break;
+	case 1:
+	  str = vcom_string1;
+	  size = sizeof (vcom_string1);
+	  break;
+	case 2:
+	  str = vcom_string2;
+	  size = sizeof (vcom_string2);
+	  break;
+	case 3:
+	  str = vcom_string3;
+	  size = sizeof (vcom_string3);
+	  break;
+	default:
+	  return -1;
+	}
+
+      return usb_lld_ctrl_send (dev, str, size);
+    }
+
+  return -1;
+}
+
+static void
+vcom_setup_endpoints_for_interface (struct usb_dev *dev,
+				    uint16_t interface, int stop)
+{
+  if (interface == 0)
+    {
+      if (!stop)
+	usb_lld_setup_endp (dev, ENDP2, 0, 1);
+      else
+	usb_lld_stall (ENDP2);
+    }
+  else if (interface == 1)
+    {
+      if (!stop)
+	{
+	  usb_lld_setup_endp (dev, ENDP1, 0, 1);
+	  usb_lld_setup_endp (dev, ENDP3, 1, 0);
+	  /* Start with no data receiving (ENDP3 not enabled)*/
+	}
+      else
+	{
+	  usb_lld_stall (ENDP1);
+	  usb_lld_stall (ENDP3);
+	}
+    }
+}
+
+static int
+usb_set_configuration (struct usb_dev *dev)
+{
+  int i;
+  uint8_t current_conf;
+
+  current_conf = usb_lld_current_configuration (dev);
+  if (current_conf == 0)
+    {
+      if (dev->dev_req.value != 1)
+	return -1;
+
+      usb_lld_set_configuration (dev, 1);
+      for (i = 0; i < NUM_INTERFACES; i++)
+	vcom_setup_endpoints_for_interface (dev, i, 0);
+      chopstx_mutex_lock (&tty0.mtx);
+      tty0.device_state = CONFIGURED;
+      chopstx_cond_signal (&tty0.cnd);
+      chopstx_mutex_unlock (&tty0.mtx);
+    }
+  else if (current_conf != dev->dev_req.value)
+    {
+      if (dev->dev_req.value != 0)
+	return -1;
+
+      usb_lld_set_configuration (dev, 0);
+      for (i = 0; i < NUM_INTERFACES; i++)
+	vcom_setup_endpoints_for_interface (dev, i, 1);
+      chopstx_mutex_lock (&tty0.mtx);
+      tty0.device_state = ADDRESSED;
+      chopstx_cond_signal (&tty0.cnd);
+      chopstx_mutex_unlock (&tty0.mtx);
+    }
+
+  return usb_lld_ctrl_ack (dev);
+}
+
+
+static int
+usb_set_interface (struct usb_dev *dev)
+{
+  uint16_t interface = dev->dev_req.index;
+  uint16_t alt = dev->dev_req.value;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  if (alt != 0)
+    return -1;
+  else
+    {
+      vcom_setup_endpoints_for_interface (dev, interface, 0);
+      return usb_lld_ctrl_ack (dev);
+    }
+}
+
+static int
+usb_get_interface (struct usb_dev *dev)
+{
+  const uint8_t zero = 0;
+  uint16_t interface = dev->dev_req.index;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  /* We don't have alternate interface, so, always return 0.  */
+  return usb_lld_ctrl_send (dev, &zero, 1);
+}
+
+static int
+usb_get_status_interface (struct usb_dev *dev)
+{
+  const uint16_t status_info = 0;
+  uint16_t interface = dev->dev_req.index;
+
+  if (interface >= NUM_INTERFACES)
+    return -1;
+
+  return usb_lld_ctrl_send (dev, &status_info, 2);
+}
+
+
+/*
+ * Put a character into the ring buffer to be send back.
+ */
+static void
+put_char_to_ringbuffer (struct tty *t, int c)
+{
+  uint32_t next = (t->send_tail + 1) % LINEBUFSIZE;
+
+  if (t->send_head == next)
+    /* full */
+    /* All that we can do is ignore this char. */
+    return;
+  
+  t->send_buf[t->send_tail] = c;
+  t->send_tail = next;
+}
+
+/*
+ * Get characters from ring buffer into S.
+ */
+static int
+get_chars_from_ringbuffer (struct tty *t, uint8_t *s, int len)
+{
+  int i = 0;
+
+  if (t->send_head == t->send_tail)
+    /* Empty */
+    return i;
+
+  do
+    {
+      s[i++] = t->send_buf[t->send_head];
+      t->send_head = (t->send_head + 1) % LINEBUFSIZE;
+    }
+  while (t->send_head != t->send_tail && i < len);
+
+  return i;
+}
+
+
+static void
+tty_echo_char (struct tty *t, int c)
+{
+  put_char_to_ringbuffer (t, c);
+}
+
+static void
+usb_tx_done (uint8_t ep_num, uint16_t len)
+{
+  struct tty *t = tty_get (-1, ep_num);
+
+  (void)len;
+
+  if (ep_num == ENDP1)
+    {
+      chopstx_mutex_lock (&t->mtx);
+      if (t->flag_send_ready == 0)
+	{
+	  t->flag_send_ready = 1;
+	  chopstx_cond_signal (&t->cnd);
+	}
+      chopstx_mutex_unlock (&t->mtx);
+    }
+  else if (ep_num == ENDP2)
+    {
+      /* Nothing */
+    }
+}
+
+
+static int
+tty_input_char (struct tty *t, int c)
+{
+  unsigned int i;
+  int r = 0;
+
+  /* Process DEL, C-U, C-R, and RET as editing command. */
+  chopstx_mutex_lock (&t->mtx);
+  switch (c)
+    {
+    case 0x0d: /* Control-M */
+      t->inputline[t->inputline_len++] = '\n';
+      tty_echo_char (t, 0x0d);
+      tty_echo_char (t, 0x0a);
+      t->flag_input_avail = 1;
+      r = 1;
+      chopstx_cond_signal (&t->cnd);
+      break;
+    case 0x12: /* Control-R */
+      tty_echo_char (t, '^');
+      tty_echo_char (t, 'R');
+      tty_echo_char (t, 0x0d);
+      tty_echo_char (t, 0x0a);
+      for (i = 0; i < t->inputline_len; i++)
+	tty_echo_char (t, t->inputline[i]);
+      break;
+    case 0x15: /* Control-U */
+      for (i = 0; i < t->inputline_len; i++)
+	{
+	  tty_echo_char (t, 0x08);
+	  tty_echo_char (t, 0x20);
+	  tty_echo_char (t, 0x08);
+	}
+      t->inputline_len = 0;
+      break;
+    case 0x7f: /* DEL    */
+      if (t->inputline_len > 0)
+	{
+	  tty_echo_char (t, 0x08);
+	  tty_echo_char (t, 0x20);
+	  tty_echo_char (t, 0x08);
+	  t->inputline_len--;
+	}
+      break;
+    default:
+      if (t->inputline_len < sizeof (t->inputline) - 1)
+	{
+	  tty_echo_char (t, c);
+	  t->inputline[t->inputline_len++] = c;
+	}
+      else
+	/* Beep */
+	tty_echo_char (t, 0x0a);
+      break;
+    }
+  chopstx_mutex_unlock (&t->mtx);
+  return r;
+}
+
+static void
+usb_rx_ready (uint8_t ep_num, uint16_t len)
+{
+  struct tty *t = tty_get (-1, ep_num);
+
+  if (ep_num == ENDP3)
+    {
+      int i;
+
+      for (i = 0; i < len; i++)
+	if (tty_input_char (t, t->recv_buf0[i]))
+	  break;
+
+      chopstx_mutex_lock (&t->mtx);
+      if (t->flag_input_avail == 0)
+	usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64);
+      chopstx_mutex_unlock (&t->mtx);
+    }
+}
+
+static void *tty_main (void *arg);
+
+#define INTR_REQ_USB 24
+#define PRIO_TTY      4
+
+extern uint8_t __process3_stack_base__[], __process3_stack_size__[];
+#define STACK_ADDR_TTY ((uint32_t)__process3_stack_base__)
+#define STACK_SIZE_TTY ((uint32_t)__process3_stack_size__)
+
+struct tty *
+tty_open (void)
+{
+  chopstx_mutex_init (&tty0.mtx);
+  chopstx_cond_init (&tty0.cnd);
+  tty0.inputline_len = 0;
+  tty0.send_head = tty0.send_tail = 0;
+  tty0.flag_connected = 0;
+  tty0.flag_send_ready = 1;
+  tty0.flag_input_avail = 0;
+  tty0.device_state = UNCONNECTED;
+  memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
+
+  chopstx_create (PRIO_TTY, STACK_ADDR_TTY, STACK_SIZE_TTY, tty_main, &tty0);
+  return &tty0;
+}
+
+
+static void *
+tty_main (void *arg)
+{
+  struct tty *t = arg;
+  struct usb_dev dev;
+  int e;
+
+#if defined(OLDER_SYS_H)
+  /*
+   * Historically (before sys < 3.0), NVIC priority setting for USB
+   * interrupt was done in usb_lld_sys_init.  Thus this code.
+   *
+   * When USB interrupt occurs between usb_lld_init (which assumes
+   * ISR) and chopstx_claim_irq (which clears pending interrupt),
+   * invocation of usb_lld_event_handler won't occur.
+   *
+   * Calling usb_lld_event_handler is no harm even if there were no
+   * interrupts, thus, we call it unconditionally here, just in case
+   * if there is a request.
+   *
+   * We can't call usb_lld_init after chopstx_claim_irq, as
+   * usb_lld_init does its own setting for NVIC.  Calling
+   * chopstx_claim_irq after usb_lld_init overrides that.
+   *
+   */
+  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
+  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
+  goto event_handle;
+#else
+  chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
+  usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
+#endif
+
+  while (1)
+    {
+      struct chx_poll_head *pd_array[1] = {
+	(struct chx_poll_head *)&usb_intr
+      };
+      chopstx_poll (NULL, 1, pd_array);
+      if (usb_intr.ready)
+	{
+	  uint8_t ep_num;
+#if defined(OLDER_SYS_H)
+	event_handle:
+#endif
+	  /*
+	   * When interrupt is detected, call usb_lld_event_handler.
+	   * The event may be one of following:
+	   *    (1) Transfer to endpoint (bulk or interrupt)
+	   *        In this case EP_NUM is encoded in the variable E.
+	   *    (2) "NONE" event: some trasfer was done, but all was
+	   *        done by lower layer, no other work is needed in
+	   *        upper layer.
+	   *    (3) Device events: Reset or Suspend
+	   *    (4) Device requests to the endpoint zero.
+	   *        
+	   */
+	  e = usb_lld_event_handler (&dev);
+	  ep_num = USB_EVENT_ENDP (e);
+
+	  if (ep_num != 0)
+	    {
+	      if (USB_EVENT_TXRX (e))
+		usb_tx_done (ep_num, USB_EVENT_LEN (e));
+	      else
+		usb_rx_ready (ep_num, USB_EVENT_LEN (e));
+	    }
+	  else
+	    switch (USB_EVENT_ID (e))
+	      {
+	      case USB_EVENT_DEVICE_RESET:
+		usb_device_reset (&dev);
+		continue;
+
+	      case USB_EVENT_DEVICE_ADDRESSED:
+		/* The addres is assigned to the device.  We don't
+		 * need to do anything for this actually, but in this
+		 * application, we maintain the USB status of the
+		 * device.  Usually, just "continue" as EVENT_OK is
+		 * OK.
+		 */
+		chopstx_mutex_lock (&tty0.mtx);
+		tty0.device_state = ADDRESSED;
+		chopstx_cond_signal (&tty0.cnd);
+		chopstx_mutex_unlock (&tty0.mtx);
+		continue;
+
+	      case USB_EVENT_GET_DESCRIPTOR:
+		if (usb_get_descriptor (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_CONFIGURATION:
+		if (usb_set_configuration (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_INTERFACE:
+		if (usb_set_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_REQUEST:
+		/* Device specific device request.  */
+		if (usb_setup (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_STATUS_INTERFACE:
+		if (usb_get_status_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_GET_INTERFACE:
+		if (usb_get_interface (&dev) < 0)
+		  usb_lld_ctrl_error (&dev);
+		continue;
+
+	      case USB_EVENT_SET_FEATURE_DEVICE:
+	      case USB_EVENT_SET_FEATURE_ENDPOINT:
+	      case USB_EVENT_CLEAR_FEATURE_DEVICE:
+	      case USB_EVENT_CLEAR_FEATURE_ENDPOINT:
+		usb_lld_ctrl_ack (&dev);
+		continue;
+
+	      case USB_EVENT_CTRL_WRITE_FINISH:
+		/* Control WRITE transfer finished.  */
+		usb_ctrl_write_finish (&dev);
+		continue;
+
+	      case USB_EVENT_OK:
+	      case USB_EVENT_DEVICE_SUSPEND:
+	      default:
+		continue;
+	      }
+	}
+
+      chopstx_mutex_lock (&t->mtx);
+      if (t->device_state == CONFIGURED && t->flag_connected
+	  && t->flag_send_ready)
+	{
+	  uint8_t line[32];
+	  int len = get_chars_from_ringbuffer (t, line, sizeof (len));
+
+	  if (len)
+	    {
+	      memcpy (t->send_buf0, line, len);
+	      usb_lld_tx_enable_buf (ENDP1, t->send_buf0, len);
+	      t->flag_send_ready = 0;
+	    }
+	}
+      chopstx_mutex_unlock (&t->mtx);
+    }
+
+  return NULL;
+}
+
+
+void
+tty_wait_configured (struct tty *t)
+{
+  chopstx_mutex_lock (&t->mtx);
+  while (t->device_state != CONFIGURED)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  chopstx_mutex_unlock (&t->mtx);
+}
+
+
+void
+tty_wait_connection (struct tty *t)
+{
+  chopstx_mutex_lock (&t->mtx);
+  while (t->flag_connected == 0)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  t->flag_send_ready = 1;
+  t->flag_input_avail = 0;
+  t->send_head = t->send_tail = 0;
+  t->inputline_len = 0;
+  usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64); /* Accept input for line */
+  chopstx_mutex_unlock (&t->mtx);
+}
+
+static int
+check_tx (struct tty *t)
+{
+  if (t->flag_send_ready)
+    /* TX done */
+    return 1;
+  if (t->flag_connected == 0)
+    /* Disconnected */
+    return -1;
+  return 0;
+}
+
+int
+tty_send (struct tty *t, const char *buf, int len)
+{
+  int r;
+  const char *p;
+  int count;
+
+  p = buf;
+  count = len >= 64 ? 64 : len;
+
+  while (1)
+    {
+      chopstx_mutex_lock (&t->mtx);
+      while ((r = check_tx (t)) == 0)
+	chopstx_cond_wait (&t->cnd, &t->mtx);
+      if (r > 0)
+	{
+	  usb_lld_tx_enable_buf (ENDP1, p, count);
+	  t->flag_send_ready = 0;
+	}
+      chopstx_mutex_unlock (&t->mtx);
+
+      len -= count;
+      p += count;
+      if (len == 0 && count != 64)
+	/*
+	 * The size of the last packet should be != 0
+	 * If 64, send ZLP (zelo length packet)
+	 */
+	break;
+      count = len >= 64 ? 64 : len;
+    }
+
+  /* Wait until all sent. */
+  chopstx_mutex_lock (&t->mtx);
+  while ((r = check_tx (t)) == 0)
+    chopstx_cond_wait (&t->cnd, &t->mtx);
+  chopstx_mutex_unlock (&t->mtx);
+  return r;
+}
+
+
+static int
+check_rx (void *arg)
+{
+  struct tty *t = arg;
+
+  if (t->flag_input_avail)
+    /* RX */
+    return 1;
+  if (t->flag_connected == 0)
+    /* Disconnected */
+    return 1;
+  return 0;
+}
+
+/*
+ * Returns -1 on connection close
+ *          0 on timeout.
+ *          >0 length of the inputline (including final \n) 
+ *
+ */
+int
+tty_recv (struct tty *t, char *buf, uint32_t *timeout)
+{
+  int r;
+  chopstx_poll_cond_t poll_desc;
+
+  poll_desc.type = CHOPSTX_POLL_COND;
+  poll_desc.ready = 0;
+  poll_desc.cond = &t->cnd;
+  poll_desc.mutex = &t->mtx;
+  poll_desc.check = check_rx;
+  poll_desc.arg = t;
+
+  while (1)
+    {
+      struct chx_poll_head *pd_array[1] = {
+	(struct chx_poll_head *)&poll_desc
+      };
+      chopstx_poll (timeout, 1, pd_array);
+      chopstx_mutex_lock (&t->mtx);
+      r = check_rx (t);
+      chopstx_mutex_unlock (&t->mtx);
+      if (r || (timeout != NULL && *timeout == 0))
+	break;
+    }
+
+  chopstx_mutex_lock (&t->mtx);
+  if (t->flag_connected == 0)
+    r = -1;
+  else if (t->flag_input_avail)
+    {
+      r = t->inputline_len;
+      memcpy (buf, t->inputline, r);
+      t->flag_input_avail = 0;
+      usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64);
+      t->inputline_len = 0;
+    }
+  else
+    r = 0;
+  chopstx_mutex_unlock (&t->mtx);
+
+  return r;
+}
--- a/example-fsm-55/Makefile
+++ b/example-fsm-55/Makefile
@@ -5,16 +5,16 @@ PROJECT = hacker-emblem
 CHOPSTX = ..
 LDSCRIPT= hacker-emblem.ld

-CSRC = sys.c hh.c
+CSRC = reset.c hh.c

 # Hacker Emblem and "Happy Hacking!" demonstration
-# CSRC = sys.c hh.c
+# CSRC = reset.c hh.c

 # Debian logo demonstration
-# CSRC = sys.c debian-logo.c
+# CSRC = reset.c debian-logo.c

 # "Hiroshi & Ayumi with Tulip" demonstration
-# CSRC = sys.c hiroshi-ayumi.c
+# CSRC = reset.c hiroshi-ayumi.c

 ###################################
 CROSS = arm-none-eabi-
@@ -36,7 +36,7 @@ board.h:
 	@echo Please make a symbolic link \'board.h\' to a file in ../board;
 	@exit 1

-sys.c: board.h
+reset.c: board.h

 distclean: clean
 	rm -f board.h
--- a/example-fsm-55/debian-logo.c
+++ b/example-fsm-55/debian-logo.c
@@ -34,8 +34,8 @@ struct GPIO {
 #define GPIOF_BASE	(AHB2PERIPH_BASE + 0x1400)
 #define GPIOF		((struct GPIO *) GPIOF_BASE)

-static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
-static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
+static struct GPIO *const GPIO_LED = ((struct GPIO *)GPIO_LED_BASE);
+static struct GPIO *const GPIO_OTHER = ((struct GPIO *)GPIO_OTHER_BASE);

 static chopstx_mutex_t mtx;
 static chopstx_cond_t cnd0, cnd1;
@@ -166,14 +166,14 @@ button (void *arg)
 #define PRIO_LED 3
 #define PRIO_BUTTON 2

-extern uint8_t __process1_stack_base__, __process1_stack_size__;
-extern uint8_t __process2_stack_base__, __process2_stack_size__;
+extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
+extern uint8_t __process2_stack_base__[], __process2_stack_size__[];

-const uint32_t __stackaddr_led = (uint32_t)&__process1_stack_base__;
-const size_t __stacksize_led = (size_t)&__process1_stack_size__;
+#define STACK_ADDR_LED ((uint32_t)__process1_stack_base__)
+#define STACK_SIZE_LED ((uint32_t)__process1_stack_size__)

-const uint32_t __stackaddr_button = (uint32_t)&__process2_stack_base__;
-const size_t __stacksize_button = (size_t)&__process2_stack_size__;
+#define STACK_ADDR_BUTTON ((uint32_t)__process2_stack_base__)
+#define STACK_SIZE_BUTTON ((uint32_t)__process2_stack_size__)

 #define DATA55(x0,x1,x2,x3,x4) (x0<<20)|(x1<<15)|(x2<<10)|(x3<< 5)|(x4<< 0)
 #define SIZE55(img) (sizeof (img) / sizeof (uint32_t))
@@ -382,10 +382,10 @@ main (int argc, const char *argv[])
  chopstx_cond_init (&cnd0);
  chopstx_cond_init (&cnd1);

-  led_thd = chopstx_create (PRIO_LED, __stackaddr_led,
-			    __stacksize_led, led, NULL);
-  button_thd = chopstx_create (PRIO_BUTTON, __stackaddr_button,
-			       __stacksize_button, button, NULL);
+  led_thd = chopstx_create (PRIO_LED, STACK_ADDR_LED,
+			    STACK_SIZE_LED, led, NULL);
+  button_thd = chopstx_create (PRIO_BUTTON, STACK_ADDR_BUTTON,
+			       STACK_SIZE_BUTTON, button, NULL);

  chopstx_usec_wait (200*1000);

@@ -450,7 +450,7 @@ struct SCB

 #define SCS_BASE	(0xE000E000)
 #define SCB_BASE	(SCS_BASE +  0x0D00)
-static struct SCB *const SCB = ((struct SCB *const) SCB_BASE);
+static struct SCB *const SCB = ((struct SCB *)SCB_BASE);

 #define SCB_SCR_SLEEPDEEP (1 << 2)

--- a/example-fsm-55/hacker-emblem.ld
+++ b/example-fsm-55/hacker-emblem.ld
@@ -1,7 +1,7 @@
 /*
 * ST32F0 memory setup.
 */
-__main_stack_size__     = 0x0100;  /* Exception handlers     */
+__main_stack_size__     = 0x0100;  /* Idle+Exception handlers */
 __process0_stack_size__  = 0x0100; /* Main program            */
 __process1_stack_size__  = 0x0100; /* first thread program    */
 __process2_stack_size__  = 0x0100; /* second thread program   */
--- a/example-fsm-55/hh.c
+++ b/example-fsm-55/hh.c
@@ -34,8 +34,8 @@ struct GPIO {
 #define GPIOF_BASE	(AHB2PERIPH_BASE + 0x1400)
 #define GPIOF		((struct GPIO *) GPIOF_BASE)

-static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
-static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
+static struct GPIO *const GPIO_LED = ((struct GPIO *)GPIO_LED_BASE);
+static struct GPIO *const GPIO_OTHER = ((struct GPIO *)GPIO_OTHER_BASE);

 static chopstx_mutex_t mtx;
 static chopstx_cond_t cnd0, cnd1;
@@ -166,14 +166,14 @@ button (void *arg)
 #define PRIO_LED 3
 #define PRIO_BUTTON 2

-extern uint8_t __process1_stack_base__, __process1_stack_size__;
-extern uint8_t __process2_stack_base__, __process2_stack_size__;
+extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
+extern uint8_t __process2_stack_base__[], __process2_stack_size__[];

-const uint32_t __stackaddr_led = (uint32_t)&__process1_stack_base__;
-const size_t __stacksize_led = (size_t)&__process1_stack_size__;
+#define STACK_ADDR_LED ((uint32_t)__process1_stack_base__)
+#define STACK_SIZE_LED ((uint32_t)__process1_stack_size__)

-const uint32_t __stackaddr_button = (uint32_t)&__process2_stack_base__;
-const size_t __stacksize_button = (size_t)&__process2_stack_size__;
+#define STACK_ADDR_BUTTON ((uint32_t)__process2_stack_base__)
+#define STACK_SIZE_BUTTON ((uint32_t)__process2_stack_size__)

 #define DATA55(x0,x1,x2,x3,x4) (x0<<20)|(x1<<15)|(x2<<10)|(x3<< 5)|(x4<< 0)
 #define SIZE55(img) (sizeof (img) / sizeof (uint32_t))
@@ -370,10 +370,10 @@ main (int argc, const char *argv[])
  chopstx_cond_init (&cnd0);
  chopstx_cond_init (&cnd1);

-  led_thd = chopstx_create (PRIO_LED, __stackaddr_led,
-			    __stacksize_led, led, NULL);
-  button_thd = chopstx_create (PRIO_BUTTON, __stackaddr_button,
-			       __stacksize_button, button, NULL);
+  led_thd = chopstx_create (PRIO_LED, STACK_ADDR_LED,
+			    STACK_SIZE_LED, led, NULL);
+  button_thd = chopstx_create (PRIO_BUTTON, STACK_ADDR_BUTTON,
+			       STACK_SIZE_BUTTON, button, NULL);

  chopstx_usec_wait (200*1000);

@@ -438,7 +438,7 @@ struct SCB

 #define SCS_BASE	(0xE000E000)
 #define SCB_BASE	(SCS_BASE +  0x0D00)
-static struct SCB *const SCB = ((struct SCB *const) SCB_BASE);
+static struct SCB *const SCB = ((struct SCB *)SCB_BASE);

 #define SCB_SCR_SLEEPDEEP (1 << 2)

--- a/example-fsm-55/hiroshi-ayumi.c
+++ b/example-fsm-55/hiroshi-ayumi.c
@@ -35,8 +35,8 @@ struct GPIO {

 #define GPIO_SPEAKER_PIN    1

-static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
-static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
+static struct GPIO *const GPIO_LED = ((struct GPIO *)GPIO_LED_BASE);
+static struct GPIO *const GPIO_OTHER = ((struct GPIO *)GPIO_OTHER_BASE);

 static chopstx_mutex_t mtx;
 static chopstx_cond_t cnd;
@@ -88,10 +88,10 @@ led_enable_column (uint8_t col)

 #define PRIO_LED 3

-extern uint8_t __process1_stack_base__, __process1_stack_size__;
+extern uint8_t __process1_stack_base__[], __process1_stack_size__[];

-const uint32_t stackaddr_led = (uint32_t)&__process1_stack_base__;
-const size_t stacksize_led = (size_t)&__process1_stack_size__;
+#define STACK_ADDR_LED ((uint32_t)__process1_stack_base__)
+#define STACK_SIZE_LED ((uint32_t)__process1_stack_size__)

 static void *
 led (void *arg)
@@ -119,10 +119,10 @@ led (void *arg)


 #define PRIO_SPK 4
-extern uint8_t __process2_stack_base__, __process2_stack_size__;
+extern uint8_t __process2_stack_base__[], __process2_stack_size__[];

-const uint32_t stackaddr_spk = (uint32_t)&__process2_stack_base__;
-const size_t stacksize_spk = (size_t)&__process2_stack_size__;
+#define STACK_ADDR_SPK ((uint32_t)__process2_stack_base__)
+#define STACK_SIZE_SPK ((uint32_t)__process2_stack_size__)

 static chopstx_mutex_t spk_mtx;
 static chopstx_cond_t spk_cnd;
@@ -193,10 +193,10 @@ spk (void *arg)


 #define PRIO_MUSIC 2
-extern uint8_t __process3_stack_base__, __process3_stack_size__;
+extern uint8_t __process3_stack_base__[], __process3_stack_size__[];

-const uint32_t stackaddr_music = (uint32_t)&__process3_stack_base__;
-const size_t stacksize_music = (size_t)&__process3_stack_size__;
+#define STACK_ADDR_MUSIC ((uint32_t)__process3_stack_base__)
+#define STACK_SIZE_MUSIC ((uint32_t)__process3_stack_size__)

 #define C 0
 #define D 1
@@ -254,7 +254,7 @@ music (void *arg)
  chopstx_cond_init (&spk_cnd);
  chopstx_cond_init (&spk_cnd_no_tone);

-  chopstx_create (PRIO_SPK, stackaddr_spk, stacksize_spk, spk, NULL);
+  chopstx_create (PRIO_SPK, STACK_ADDR_SPK, STACK_SIZE_SPK, spk, NULL);

  while (1)
    {
@@ -350,8 +350,8 @@ main (int argc, const char *argv[])
  chopstx_mutex_init (&mtx);
  chopstx_cond_init (&cnd);

-  chopstx_create (PRIO_LED, stackaddr_led, stacksize_led, led, NULL);
-  chopstx_create (PRIO_MUSIC, stackaddr_music, stacksize_music, music, NULL);
+  chopstx_create (PRIO_LED, STACK_ADDR_LED, STACK_SIZE_LED, led, NULL);
+  chopstx_create (PRIO_MUSIC, STACK_ADDR_MUSIC, STACK_SIZE_MUSIC, music, NULL);

  chopstx_usec_wait (200*1000);

--- a/example-fsm-55/reset.c
+++ b/example-fsm-55/reset.c
@@ -1,5 +1,5 @@
 /*
- * sys.c - No system routines, but only RESET handler for STM32F030.
+ * reset.c - No system routines, but only RESET handler for STM32F030.
 *
 * Copyright (C) 2015 Flying Stone Technology
 * Author: NIIBE Yutaka <gniibe@fsij.org>
@@ -31,7 +31,6 @@ reset (void)
 }

 extern uint8_t __main_stack_end__;
-extern void svc (void);
 extern void preempt (void);
 extern void chx_timer_expired (void);
 extern void chx_handle_intr (void);
@@ -44,13 +43,6 @@ static void nmi (void)
 static void __attribute__ ((naked))
 hard_fault (void)
 {
-  register uint32_t primask;
-
-  asm ("mrs	%0, PRIMASK" : "=r" (primask));
-
-  if (primask)
-    asm volatile ("b	svc");
-  else
  for (;;);
 }

@@ -78,7 +70,7 @@ typedef void (*handler)(void);
 extern uint8_t __main_stack_end__;

 handler vector[] __attribute__ ((section(".vectors"))) = {
-  (handler)&__main_stack_end__,
+  (handler)(&__main_stack_end__ - 32),
  reset,
  nmi,		/* nmi */
  hard_fault,		/* hard fault */
@@ -89,7 +81,7 @@ handler vector[] __attribute__ ((section(".vectors"))) = {
  none,
  /* 0x20 */
  none, none, none,		/* reserved */
-  svc,				/* SVCall */
+  none,				/* SVCall */
  none,				/* Debug */
  none,				/* reserved */
  preempt,			/* PendSV */
--- a/example-led/Makefile
+++ b/example-led/Makefile
@@ -8,8 +8,10 @@ PROJECT = sample
 CHOPSTX = ..
 LDSCRIPT= sample.ld
 ### LDSCRIPT= sample.ld.m3
-CSRC = sys.c sample.c
-### CSRC = sys.c aes-constant-ft.c sample.c
+CSRC = sample.c
+
+CHIP=stm32f0
+USE_SYS = yes

 ###################################
 CROSS = arm-none-eabi-
@@ -20,8 +22,8 @@ OBJCOPY   = $(CROSS)objcopy
 ### MCU   = cortex-m3
 MCU   = cortex-m0
 CWARN = -Wall -Wextra -Wstrict-prototypes
-DEFS  = -DHAVE_SYS_H -DFREE_STANDING -DMHZ=48
-### DEFS  = -DFREE_STANDING -DHAVE_SYS_H -DBUSY_LOOP -DCHX_FLAGS_MAIN=CHOPSTX_SCHED_RR
+DEFS  = -DUSE_SYS3 -DFREE_STANDING -DMHZ=48
+### DEFS  = -DFREE_STANDING -DUSE_SYS3 -DBUSY_LOOP -DCHX_FLAGS_MAIN=CHOPSTX_SCHED_RR
 OPT   = -O3 -Os -g
 LIBS  =

--- a/example-led/aes-constant-ft.c
+++ b/example-led/aes-constant-ft.c
@@ -1,145 +0,0 @@
-/*
- * aes-constant-ft.c - AES forward tables.
- *
- * We need something useful for the initial flash ROM page (4 Ki
- * bytes), which cannot be modified after installation.  Even after
- * upgrade of the firmware, it stays intact.
- *
- * We decide to put 3/4 of AES forward tables to fill 3 Ki bytes, as
- * its useful and it won't change.
- *
- * The code was taken from aes.c of PolarSSL version 0.14, and then,
- * modified to add section names.
- *
- * Since this is just a data, it wouldn't be copyright-able, but the
- * original auther would claim so.  Thus, we put original copyright
- * notice here.  It is highly likely that there will be no such a
- * thing for copyright.  Nevertheless, we think that PolarSSL is good
- * software to address here, and encourage people using it.
- *
- */
-
-#include <stdint.h>
-
-/*
- * Original copyright notice is below:
- */
-
-/*
- *  FIPS-197 compliant AES implementation
- *
- *  Copyright (C) 2006-2010, Brainspark B.V.
- *
- *  This file is part of PolarSSL (http://www.polarssl.org)
- *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
- *
- *  All rights reserved.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-/*
- *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
- *
- *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
- *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
- */
-
-/*
- * Forward tables
- */
-#define FT \
-\
-    V(A5,63,63,C6), V(84,7C,7C,F8), V(99,77,77,EE), V(8D,7B,7B,F6), \
-    V(0D,F2,F2,FF), V(BD,6B,6B,D6), V(B1,6F,6F,DE), V(54,C5,C5,91), \
-    V(50,30,30,60), V(03,01,01,02), V(A9,67,67,CE), V(7D,2B,2B,56), \
-    V(19,FE,FE,E7), V(62,D7,D7,B5), V(E6,AB,AB,4D), V(9A,76,76,EC), \
-    V(45,CA,CA,8F), V(9D,82,82,1F), V(40,C9,C9,89), V(87,7D,7D,FA), \
-    V(15,FA,FA,EF), V(EB,59,59,B2), V(C9,47,47,8E), V(0B,F0,F0,FB), \
-    V(EC,AD,AD,41), V(67,D4,D4,B3), V(FD,A2,A2,5F), V(EA,AF,AF,45), \
-    V(BF,9C,9C,23), V(F7,A4,A4,53), V(96,72,72,E4), V(5B,C0,C0,9B), \
-    V(C2,B7,B7,75), V(1C,FD,FD,E1), V(AE,93,93,3D), V(6A,26,26,4C), \
-    V(5A,36,36,6C), V(41,3F,3F,7E), V(02,F7,F7,F5), V(4F,CC,CC,83), \
-    V(5C,34,34,68), V(F4,A5,A5,51), V(34,E5,E5,D1), V(08,F1,F1,F9), \
-    V(93,71,71,E2), V(73,D8,D8,AB), V(53,31,31,62), V(3F,15,15,2A), \
-    V(0C,04,04,08), V(52,C7,C7,95), V(65,23,23,46), V(5E,C3,C3,9D), \
-    V(28,18,18,30), V(A1,96,96,37), V(0F,05,05,0A), V(B5,9A,9A,2F), \
-    V(09,07,07,0E), V(36,12,12,24), V(9B,80,80,1B), V(3D,E2,E2,DF), \
-    V(26,EB,EB,CD), V(69,27,27,4E), V(CD,B2,B2,7F), V(9F,75,75,EA), \
-    V(1B,09,09,12), V(9E,83,83,1D), V(74,2C,2C,58), V(2E,1A,1A,34), \
-    V(2D,1B,1B,36), V(B2,6E,6E,DC), V(EE,5A,5A,B4), V(FB,A0,A0,5B), \
-    V(F6,52,52,A4), V(4D,3B,3B,76), V(61,D6,D6,B7), V(CE,B3,B3,7D), \
-    V(7B,29,29,52), V(3E,E3,E3,DD), V(71,2F,2F,5E), V(97,84,84,13), \
-    V(F5,53,53,A6), V(68,D1,D1,B9), V(00,00,00,00), V(2C,ED,ED,C1), \
-    V(60,20,20,40), V(1F,FC,FC,E3), V(C8,B1,B1,79), V(ED,5B,5B,B6), \
-    V(BE,6A,6A,D4), V(46,CB,CB,8D), V(D9,BE,BE,67), V(4B,39,39,72), \
-    V(DE,4A,4A,94), V(D4,4C,4C,98), V(E8,58,58,B0), V(4A,CF,CF,85), \
-    V(6B,D0,D0,BB), V(2A,EF,EF,C5), V(E5,AA,AA,4F), V(16,FB,FB,ED), \
-    V(C5,43,43,86), V(D7,4D,4D,9A), V(55,33,33,66), V(94,85,85,11), \
-    V(CF,45,45,8A), V(10,F9,F9,E9), V(06,02,02,04), V(81,7F,7F,FE), \
-    V(F0,50,50,A0), V(44,3C,3C,78), V(BA,9F,9F,25), V(E3,A8,A8,4B), \
-    V(F3,51,51,A2), V(FE,A3,A3,5D), V(C0,40,40,80), V(8A,8F,8F,05), \
-    V(AD,92,92,3F), V(BC,9D,9D,21), V(48,38,38,70), V(04,F5,F5,F1), \
-    V(DF,BC,BC,63), V(C1,B6,B6,77), V(75,DA,DA,AF), V(63,21,21,42), \
-    V(30,10,10,20), V(1A,FF,FF,E5), V(0E,F3,F3,FD), V(6D,D2,D2,BF), \
-    V(4C,CD,CD,81), V(14,0C,0C,18), V(35,13,13,26), V(2F,EC,EC,C3), \
-    V(E1,5F,5F,BE), V(A2,97,97,35), V(CC,44,44,88), V(39,17,17,2E), \
-    V(57,C4,C4,93), V(F2,A7,A7,55), V(82,7E,7E,FC), V(47,3D,3D,7A), \
-    V(AC,64,64,C8), V(E7,5D,5D,BA), V(2B,19,19,32), V(95,73,73,E6), \
-    V(A0,60,60,C0), V(98,81,81,19), V(D1,4F,4F,9E), V(7F,DC,DC,A3), \
-    V(66,22,22,44), V(7E,2A,2A,54), V(AB,90,90,3B), V(83,88,88,0B), \
-    V(CA,46,46,8C), V(29,EE,EE,C7), V(D3,B8,B8,6B), V(3C,14,14,28), \
-    V(79,DE,DE,A7), V(E2,5E,5E,BC), V(1D,0B,0B,16), V(76,DB,DB,AD), \
-    V(3B,E0,E0,DB), V(56,32,32,64), V(4E,3A,3A,74), V(1E,0A,0A,14), \
-    V(DB,49,49,92), V(0A,06,06,0C), V(6C,24,24,48), V(E4,5C,5C,B8), \
-    V(5D,C2,C2,9F), V(6E,D3,D3,BD), V(EF,AC,AC,43), V(A6,62,62,C4), \
-    V(A8,91,91,39), V(A4,95,95,31), V(37,E4,E4,D3), V(8B,79,79,F2), \
-    V(32,E7,E7,D5), V(43,C8,C8,8B), V(59,37,37,6E), V(B7,6D,6D,DA), \
-    V(8C,8D,8D,01), V(64,D5,D5,B1), V(D2,4E,4E,9C), V(E0,A9,A9,49), \
-    V(B4,6C,6C,D8), V(FA,56,56,AC), V(07,F4,F4,F3), V(25,EA,EA,CF), \
-    V(AF,65,65,CA), V(8E,7A,7A,F4), V(E9,AE,AE,47), V(18,08,08,10), \
-    V(D5,BA,BA,6F), V(88,78,78,F0), V(6F,25,25,4A), V(72,2E,2E,5C), \
-    V(24,1C,1C,38), V(F1,A6,A6,57), V(C7,B4,B4,73), V(51,C6,C6,97), \
-    V(23,E8,E8,CB), V(7C,DD,DD,A1), V(9C,74,74,E8), V(21,1F,1F,3E), \
-    V(DD,4B,4B,96), V(DC,BD,BD,61), V(86,8B,8B,0D), V(85,8A,8A,0F), \
-    V(90,70,70,E0), V(42,3E,3E,7C), V(C4,B5,B5,71), V(AA,66,66,CC), \
-    V(D8,48,48,90), V(05,03,03,06), V(01,F6,F6,F7), V(12,0E,0E,1C), \
-    V(A3,61,61,C2), V(5F,35,35,6A), V(F9,57,57,AE), V(D0,B9,B9,69), \
-    V(91,86,86,17), V(58,C1,C1,99), V(27,1D,1D,3A), V(B9,9E,9E,27), \
-    V(38,E1,E1,D9), V(13,F8,F8,EB), V(B3,98,98,2B), V(33,11,11,22), \
-    V(BB,69,69,D2), V(70,D9,D9,A9), V(89,8E,8E,07), V(A7,94,94,33), \
-    V(B6,9B,9B,2D), V(22,1E,1E,3C), V(92,87,87,15), V(20,E9,E9,C9), \
-    V(49,CE,CE,87), V(FF,55,55,AA), V(78,28,28,50), V(7A,DF,DF,A5), \
-    V(8F,8C,8C,03), V(F8,A1,A1,59), V(80,89,89,09), V(17,0D,0D,1A), \
-    V(DA,BF,BF,65), V(31,E6,E6,D7), V(C6,42,42,84), V(B8,68,68,D0), \
-    V(C3,41,41,82), V(B0,99,99,29), V(77,2D,2D,5A), V(11,0F,0F,1E), \
-    V(CB,B0,B0,7B), V(FC,54,54,A8), V(D6,BB,BB,6D), V(3A,16,16,2C)
-
-#define V(a,b,c,d) 0x##a##b##c##d
-const uint32_t FT0[256] __attribute__((section(".sys.0"))) = { FT };
-#undef V
-
-#define V(a,b,c,d) 0x##b##c##d##a
-const uint32_t FT1[256] __attribute__((section(".sys.1"))) = { FT };
-#undef V
-
-#define V(a,b,c,d) 0x##c##d##a##b
-const uint32_t FT2[256] __attribute__((section(".sys.2"))) = { FT };
-#undef V
-
-#ifdef ORIGINAL_IMPLEMENTATION 
-#define V(a,b,c,d) 0x##d##a##b##c
-const uint32_t FT3[256] = { FT };
-#undef V
-#endif
--- a/example-led/sample.c
+++ b/example-led/sample.c
@@ -72,14 +72,14 @@ blk (void *arg)
 #define PRIO_BLK 2
 #endif

-extern uint8_t __process1_stack_base__, __process1_stack_size__;
-extern uint8_t __process2_stack_base__, __process2_stack_size__;
+extern uint8_t __process1_stack_base__[], __process1_stack_size__[];
+extern uint8_t __process2_stack_base__[], __process2_stack_size__[];

-const uint32_t __stackaddr_pwm = (uint32_t)&__process1_stack_base__;
-const size_t __stacksize_pwm = (size_t)&__process1_stack_size__;
+#define STACK_ADDR_PWM ((uint32_t)__process1_stack_base__)
+#define STACK_SIZE_PWM ((uint32_t)__process1_stack_size__)

-const uint32_t __stackaddr_blk = (uint32_t)&__process2_stack_base__;
-const size_t __stacksize_blk = (size_t)&__process2_stack_size__;
+#define STACK_ADDR_BLK ((uint32_t)__process2_stack_base__)
+#define STACK_SIZE_BLK ((uint32_t)__process2_stack_size__)


 int
@@ -94,8 +94,8 @@ main (int argc, const char *argv[])

  m = 10;

-  chopstx_create (PRIO_PWM, __stackaddr_pwm, __stacksize_pwm, pwm, NULL);
-  chopstx_create (PRIO_BLK, __stackaddr_blk, __stacksize_blk, blk, NULL);
+  chopstx_create (PRIO_PWM, STACK_ADDR_PWM, STACK_SIZE_PWM, pwm, NULL);
+  chopstx_create (PRIO_BLK, STACK_ADDR_BLK, STACK_SIZE_BLK, blk, NULL);

  chopstx_usec_wait (200*1000);

--- a/example-led/sample.ld
+++ b/example-led/sample.ld
@@ -1,7 +1,7 @@
 /*
 * ST32F0 memory setup.
 */
-__main_stack_size__     = 0x0100;  /* Exception handlers     */
+__main_stack_size__      = 0x0100; /* Idle+Exception handlers */
 __process0_stack_size__  = 0x0100; /* Main program            */
 __process1_stack_size__  = 0x0100; /* first thread program    */
 __process2_stack_size__  = 0x0100; /* second thread program   */
@@ -30,10 +30,10 @@ SECTIONS
 	KEEP(*(.sys.version))
 	KEEP(*(.sys.board_id))
 	KEEP(*(.sys.board_name))
-	build/sys.o(.text)
-	build/sys.o(.text.*)
-	build/sys.o(.rodata)
-	build/sys.o(.rodata.*)
+	build/sys-*.o(.text)
+	build/sys-*.o(.text.*)
+	build/sys-*.o(.rodata)
+	build/sys-*.o(.rodata.*)
 	. = ALIGN(1024);
 /*
 	*(.sys.0)
--- a/example-led/sample.ld.m3
+++ b/example-led/sample.ld.m3
@@ -1,7 +1,7 @@
 /*
 * ST32F103 memory setup.
 */
-__main_stack_size__     = 0x0100;  /* Exception handlers     */
+__main_stack_size__      = 0x0100; /* Idle+Exception handlers */
 __process0_stack_size__  = 0x0100; /* Main program            */
 __process1_stack_size__  = 0x0100; /* first thread program    */
 __process2_stack_size__  = 0x0100; /* second thread program   */
@@ -30,10 +30,10 @@ SECTIONS
 	KEEP(*(.sys.version))
 	KEEP(*(.sys.board_id))
 	KEEP(*(.sys.board_name))
-	build/sys.o(.text)
-	build/sys.o(.text.*)
-	build/sys.o(.rodata)
-	build/sys.o(.rodata.*)
+	build/sys-*.o(.text)
+	build/sys-*.o(.text.*)
+	build/sys-*.o(.rodata)
+	build/sys-*.o(.rodata.*)
 	. = ALIGN(1024);
 	*(.sys.0)
 	*(.sys.1)
--- a/example-primer2/Makefile
+++ b/example-primer2/Makefile
@@ -5,8 +5,13 @@ PROJECT = lcd
 CHOPSTX = ..
 NEUGSRC = ./neug/src
 LDSCRIPT= lcd.ld
-CSRC = sys.c aes-constant-ft.c primer2-switches.c primer2-ts.c lcd.c main.c \
-       adc_stm32f103.c neug.c sha256.c
+CSRC = primer2-switches.c primer2-ts.c lcd.c main.c \
+       neug.c sha256.c
+
+CHIP=stm32f103
+USE_SYS = yes
+USE_USB = yes
+USE_ADC = yes

 ###################################
 CROSS = arm-none-eabi-
@@ -15,8 +20,8 @@ LD   = $(CROSS)gcc
 OBJCOPY   = $(CROSS)objcopy
 MCU   = cortex-m3
 CWARN = -Wall -Wextra -Wstrict-prototypes
-DEFS  = -DHAVE_SYS_H -DFREE_STANDING -DMHZ=48
-# DEFS  = -DFREE_STANDING -DHAVE_SYS_H -DBUSY_LOOP -DCHX_FLAGS_MAIN=CHOPSTX_SCHED_RR
+DEFS  = -DUSE_SYS3 -DFREE_STANDING -DMHZ=48
+# DEFS  = -DFREE_STANDING -DUSE_SYS3 -DBUSY_LOOP -DCHX_FLAGS_MAIN=CHOPSTX_SCHED_RR
 OPT   = -O3 -Os -g
 INCDIR = $(NEUGSRC)
 LIBS  =
--- a/example-primer2/aes-constant-ft.c
+++ b/example-primer2/aes-constant-ft.c
@@ -1,145 +0,0 @@
-/*
- * aes-constant-ft.c - AES forward tables.
- *
- * We need something useful for the initial flash ROM page (4 Ki
- * bytes), which cannot be modified after installation.  Even after
- * upgrade of the firmware, it stays intact.
- *
- * We decide to put 3/4 of AES forward tables to fill 3 Ki bytes, as
- * its useful and it won't change.
- *
- * The code was taken from aes.c of PolarSSL version 0.14, and then,
- * modified to add section names.
- *
- * Since this is just a data, it wouldn't be copyright-able, but the
- * original auther would claim so.  Thus, we put original copyright
- * notice here.  It is highly likely that there will be no such a
- * thing for copyright.  Nevertheless, we think that PolarSSL is good
- * software to address here, and encourage people using it.
- *
- */
-
-#include <stdint.h>
-
-/*
- * Original copyright notice is below:
- */
-
-/*
- *  FIPS-197 compliant AES implementation
- *
- *  Copyright (C) 2006-2010, Brainspark B.V.
- *
- *  This file is part of PolarSSL (http://www.polarssl.org)
- *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
- *
- *  All rights reserved.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-/*
- *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
- *
- *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
- *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
- */
-
-/*
- * Forward tables
- */
-#define FT \
-\
-    V(A5,63,63,C6), V(84,7C,7C,F8), V(99,77,77,EE), V(8D,7B,7B,F6), \
-    V(0D,F2,F2,FF), V(BD,6B,6B,D6), V(B1,6F,6F,DE), V(54,C5,C5,91), \
-    V(50,30,30,60), V(03,01,01,02), V(A9,67,67,CE), V(7D,2B,2B,56), \
-    V(19,FE,FE,E7), V(62,D7,D7,B5), V(E6,AB,AB,4D), V(9A,76,76,EC), \
-    V(45,CA,CA,8F), V(9D,82,82,1F), V(40,C9,C9,89), V(87,7D,7D,FA), \
-    V(15,FA,FA,EF), V(EB,59,59,B2), V(C9,47,47,8E), V(0B,F0,F0,FB), \
-    V(EC,AD,AD,41), V(67,D4,D4,B3), V(FD,A2,A2,5F), V(EA,AF,AF,45), \
-    V(BF,9C,9C,23), V(F7,A4,A4,53), V(96,72,72,E4), V(5B,C0,C0,9B), \
-    V(C2,B7,B7,75), V(1C,FD,FD,E1), V(AE,93,93,3D), V(6A,26,26,4C), \
-    V(5A,36,36,6C), V(41,3F,3F,7E), V(02,F7,F7,F5), V(4F,CC,CC,83), \
-    V(5C,34,34,68), V(F4,A5,A5,51), V(34,E5,E5,D1), V(08,F1,F1,F9), \
-    V(93,71,71,E2), V(73,D8,D8,AB), V(53,31,31,62), V(3F,15,15,2A), \
-    V(0C,04,04,08), V(52,C7,C7,95), V(65,23,23,46), V(5E,C3,C3,9D), \
-    V(28,18,18,30), V(A1,96,96,37), V(0F,05,05,0A), V(B5,9A,9A,2F), \
-    V(09,07,07,0E), V(36,12,12,24), V(9B,80,80,1B), V(3D,E2,E2,DF), \
-    V(26,EB,EB,CD), V(69,27,27,4E), V(CD,B2,B2,7F), V(9F,75,75,EA), \
-    V(1B,09,09,12), V(9E,83,83,1D), V(74,2C,2C,58), V(2E,1A,1A,34), \
-    V(2D,1B,1B,36), V(B2,6E,6E,DC), V(EE,5A,5A,B4), V(FB,A0,A0,5B), \
-    V(F6,52,52,A4), V(4D,3B,3B,76), V(61,D6,D6,B7), V(CE,B3,B3,7D), \
-    V(7B,29,29,52), V(3E,E3,E3,DD), V(71,2F,2F,5E), V(97,84,84,13), \
-    V(F5,53,53,A6), V(68,D1,D1,B9), V(00,00,00,00), V(2C,ED,ED,C1), \
-    V(60,20,20,40), V(1F,FC,FC,E3), V(C8,B1,B1,79), V(ED,5B,5B,B6), \
-    V(BE,6A,6A,D4), V(46,CB,CB,8D), V(D9,BE,BE,67), V(4B,39,39,72), \
-    V(DE,4A,4A,94), V(D4,4C,4C,98), V(E8,58,58,B0), V(4A,CF,CF,85), \
-    V(6B,D0,D0,BB), V(2A,EF,EF,C5), V(E5,AA,AA,4F), V(16,FB,FB,ED), \
-    V(C5,43,43,86), V(D7,4D,4D,9A), V(55,33,33,66), V(94,85,85,11), \
-    V(CF,45,45,8A), V(10,F9,F9,E9), V(06,02,02,04), V(81,7F,7F,FE), \
-    V(F0,50,50,A0), V(44,3C,3C,78), V(BA,9F,9F,25), V(E3,A8,A8,4B), \
-    V(F3,51,51,A2), V(FE,A3,A3,5D), V(C0,40,40,80), V(8A,8F,8F,05), \
-    V(AD,92,92,3F), V(BC,9D,9D,21), V(48,38,38,70), V(04,F5,F5,F1), \
-    V(DF,BC,BC,63), V(C1,B6,B6,77), V(75,DA,DA,AF), V(63,21,21,42), \
-    V(30,10,10,20), V(1A,FF,FF,E5), V(0E,F3,F3,FD), V(6D,D2,D2,BF), \
-    V(4C,CD,CD,81), V(14,0C,0C,18), V(35,13,13,26), V(2F,EC,EC,C3), \
-    V(E1,5F,5F,BE), V(A2,97,97,35), V(CC,44,44,88), V(39,17,17,2E), \
-    V(57,C4,C4,93), V(F2,A7,A7,55), V(82,7E,7E,FC), V(47,3D,3D,7A), \
-    V(AC,64,64,C8), V(E7,5D,5D,BA), V(2B,19,19,32), V(95,73,73,E6), \
-    V(A0,60,60,C0), V(98,81,81,19), V(D1,4F,4F,9E), V(7F,DC,DC,A3), \
-    V(66,22,22,44), V(7E,2A,2A,54), V(AB,90,90,3B), V(83,88,88,0B), \
-    V(CA,46,46,8C), V(29,EE,EE,C7), V(D3,B8,B8,6B), V(3C,14,14,28), \
-    V(79,DE,DE,A7), V(E2,5E,5E,BC), V(1D,0B,0B,16), V(76,DB,DB,AD), \
-    V(3B,E0,E0,DB), V(56,32,32,64), V(4E,3A,3A,74), V(1E,0A,0A,14), \
-    V(DB,49,49,92), V(0A,06,06,0C), V(6C,24,24,48), V(E4,5C,5C,B8), \
-    V(5D,C2,C2,9F), V(6E,D3,D3,BD), V(EF,AC,AC,43), V(A6,62,62,C4), \
-    V(A8,91,91,39), V(A4,95,95,31), V(37,E4,E4,D3), V(8B,79,79,F2), \
-    V(32,E7,E7,D5), V(43,C8,C8,8B), V(59,37,37,6E), V(B7,6D,6D,DA), \
-    V(8C,8D,8D,01), V(64,D5,D5,B1), V(D2,4E,4E,9C), V(E0,A9,A9,49), \
-    V(B4,6C,6C,D8), V(FA,56,56,AC), V(07,F4,F4,F3), V(25,EA,EA,CF), \
-    V(AF,65,65,CA), V(8E,7A,7A,F4), V(E9,AE,AE,47), V(18,08,08,10), \
-    V(D5,BA,BA,6F), V(88,78,78,F0), V(6F,25,25,4A), V(72,2E,2E,5C), \
-    V(24,1C,1C,38), V(F1,A6,A6,57), V(C7,B4,B4,73), V(51,C6,C6,97), \
-    V(23,E8,E8,CB), V(7C,DD,DD,A1), V(9C,74,74,E8), V(21,1F,1F,3E), \
-    V(DD,4B,4B,96), V(DC,BD,BD,61), V(86,8B,8B,0D), V(85,8A,8A,0F), \
-    V(90,70,70,E0), V(42,3E,3E,7C), V(C4,B5,B5,71), V(AA,66,66,CC), \
-    V(D8,48,48,90), V(05,03,03,06), V(01,F6,F6,F7), V(12,0E,0E,1C), \
-    V(A3,61,61,C2), V(5F,35,35,6A), V(F9,57,57,AE), V(D0,B9,B9,69), \
-    V(91,86,86,17), V(58,C1,C1,99), V(27,1D,1D,3A), V(B9,9E,9E,27), \
-    V(38,E1,E1,D9), V(13,F8,F8,EB), V(B3,98,98,2B), V(33,11,11,22), \
-    V(BB,69,69,D2), V(70,D9,D9,A9), V(89,8E,8E,07), V(A7,94,94,33), \
-    V(B6,9B,9B,2D), V(22,1E,1E,3C), V(92,87,87,15), V(20,E9,E9,C9), \
-    V(49,CE,CE,87), V(FF,55,55,AA), V(78,28,28,50), V(7A,DF,DF,A5), \
-    V(8F,8C,8C,03), V(F8,A1,A1,59), V(80,89,89,09), V(17,0D,0D,1A), \
-    V(DA,BF,BF,65), V(31,E6,E6,D7), V(C6,42,42,84), V(B8,68,68,D0), \
-    V(C3,41,41,82), V(B0,99,99,29), V(77,2D,2D,5A), V(11,0F,0F,1E), \
-    V(CB,B0,B0,7B), V(FC,54,54,A8), V(D6,BB,BB,6D), V(3A,16,16,2C)
-
-#define V(a,b,c,d) 0x##a##b##c##d
-const uint32_t FT0[256] __attribute__((section(".sys.0"))) = { FT };
-#undef V
-
-#define V(a,b,c,d) 0x##b##c##d##a
-const uint32_t FT1[256] __attribute__((section(".sys.1"))) = { FT };
-#undef V
-
-#define V(a,b,c,d) 0x##c##d##a##b
-const uint32_t FT2[256] __attribute__((section(".sys.2"))) = { FT };
-#undef V
-
-#ifdef ORIGINAL_IMPLEMENTATION 
-#define V(a,b,c,d) 0x##d##a##b##c
-const uint32_t FT3[256] = { FT };
-#undef V
-#endif
--- a/example-primer2/lcd.ld
+++ b/example-primer2/lcd.ld
@@ -1,7 +1,7 @@
 /*
 * ST32F103 memory setup.
 */
-__main_stack_size__      = 0x0100;      /* Exception handlers     */
+__main_stack_size__      = 0x0100;      /* Idle+Exception handlers */
 __process0_stack_size__  = 0x0200;      /* main */
 __process1_stack_size__  = 0x0100;      /* lcd init */
 __process2_stack_size__  = 0x0180;      /* rng */
--- a/example-primer2/primer2-ts.c
+++ b/example-primer2/primer2-ts.c
@@ -113,10 +113,6 @@ void adc3_conversion (uint32_t *result)
 void adc3_stop (void)
 {

-#if USE_ADC3_INTR
-  chopstx_release_irq (&adc3_intr);
-#endif
-
  /* Power off.  */
  ADC3->CR1 = 0;
  ADC3->CR2 = 0;
--- a/example-primer2/sys.c
+++ b/example-primer2/sys.c
@@ -1,467 +0,0 @@
-/*
- * sys.c - system routines for the initial page for STM32F103.
- *
- * Copyright (C) 2013, 2014, 2015 Flying Stone Technology
- * Author: NIIBE Yutaka <gniibe@fsij.org>
- *
- * Copying and distribution of this file, with or without modification,
- * are permitted in any medium without royalty provided the copyright
- * notice and this notice are preserved.  This file is offered as-is,
- * without any warranty.
- *
- * When the flash ROM is protected, we cannot modify the initial page.
- * We put some system routines (which is useful for any program) here.
- */
-
-#include <stdint.h>
-#include <stdlib.h>
-#include "board.h"
-
-/* Adds port C for shutdown function.  */
-#undef RCC_ENR_IOP_EN
-#undef RCC_RSTR_IOP_RST
-#define RCC_ENR_IOP_EN \
-        (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPDEN | RCC_APB2ENR_IOPEEN \
-	 | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPBEN)
-#define RCC_RSTR_IOP_RST \
-        (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPDRST | RCC_APB2RSTR_IOPERST \
-	 | RCC_APB2RSTR_IOPCRST | RCC_APB2RSTR_IOPBRST)
-
-#include "clk_gpio_init.c"
-
-static struct GPIO *const GPIO_OTHER1 = ((struct GPIO *const) GPIOC_BASE);
-static struct GPIO *const GPIO_OTHER2 = ((struct GPIO *const) GPIOB_BASE);
-
-static void __attribute__((used))
-gpio_init_primer2 (void)
-{
-  gpio_init ();
-
-  /*
-   * Port C setup.
-   * Everything input with pull-up except:
-   * PC0  - Analog input (Touch panel L X+)
-   * PC1  - Analog input (Touch panel R X-)
-   * PC2  - Analog input (Touch panel U Y+)
-   * PC3  - Analog input (Touch panel D Y-)
-   * PC6  - Normal input because there is an external resistor.
-   * PC7  - Normal input because there is an external resistor.
-   * PC13 - Push Pull output (SHUTDOWN)
-   */
-  GPIO_OTHER1->ODR = 0xffffdfff;
-  GPIO_OTHER1->CRL = 0x44880000;
-  GPIO_OTHER1->CRH = 0x88388888;
-
-  /*
-   * Port B setup.
-   * Everything input with pull-up except:
-   * PB8  - Backlight enable output.
-   * PB13 - Alternate output  (AUDIO SPI2 SCK).
-   * PB14 - Normal input      (AUDIO SPI2 MISO).
-   * PB15 - Alternate output  (AUDIO SPI2 MOSI).
-   */
-  GPIO_OTHER2->ODR = 0xffffffff;
-  GPIO_OTHER2->CRL = 0x88888888;
-  GPIO_OTHER2->CRH = 0xb4b88883;
-}
-
-#define CORTEX_PRIORITY_BITS    4
-#define CORTEX_PRIORITY_MASK(n)  ((n) << (8 - CORTEX_PRIORITY_BITS))
-#define USB_LP_CAN1_RX0_IRQn	 20
-#define STM32_USB_IRQ_PRIORITY   11
-
-struct NVIC {
-  uint32_t ISER[8];
-  uint32_t unused1[24];
-  uint32_t ICER[8];
-  uint32_t unused2[24];
-  uint32_t ISPR[8];
-  uint32_t unused3[24];
-  uint32_t ICPR[8];
-  uint32_t unused4[24];
-  uint32_t IABR[8];
-  uint32_t unused5[56];
-  uint32_t IPR[60];
-};
-
-static struct NVIC *const NVICBase = ((struct NVIC *const)0xE000E100);
-#define NVIC_ISER(n)	(NVICBase->ISER[n >> 5])
-#define NVIC_ICPR(n)	(NVICBase->ICPR[n >> 5])
-#define NVIC_IPR(n)	(NVICBase->IPR[n >> 2])
-
-static void
-nvic_enable_vector (uint32_t n, uint32_t prio)
-{
-  unsigned int sh = (n & 3) << 3;
-
-  NVIC_IPR (n) = (NVIC_IPR(n) & ~(0xFF << sh)) | (prio << sh);
-  NVIC_ICPR (n) = 1 << (n & 0x1F);
-  NVIC_ISER (n) = 1 << (n & 0x1F);
-}
-
-static void
-usb_cable_config (int enable)
-{
-#if defined(GPIO_USB_SET_TO_ENABLE)
-  if (enable)
-    GPIO_USB->BSRR = (1 << GPIO_USB_SET_TO_ENABLE);
-  else
-    GPIO_USB->BRR = (1 << GPIO_USB_SET_TO_ENABLE);
-#elif defined(GPIO_USB_CLEAR_TO_ENABLE)
-  if (enable)
-    GPIO_USB->BRR = (1 << GPIO_USB_CLEAR_TO_ENABLE);
-  else
-    GPIO_USB->BSRR = (1 << GPIO_USB_CLEAR_TO_ENABLE);
-#else
-  (void)enable;
-#endif
-}
-
-void
-set_led (int on)
-{
-#if defined(GPIO_LED_CLEAR_TO_EMIT)
-  if (on)
-    GPIO_LED->BRR = (1 << GPIO_LED_CLEAR_TO_EMIT);
-  else
-    GPIO_LED->BSRR = (1 << GPIO_LED_CLEAR_TO_EMIT);
-#else
-  if (on)
-    GPIO_LED->BSRR = (1 << GPIO_LED_SET_TO_EMIT);
-  else
-    GPIO_LED->BRR = (1 << GPIO_LED_SET_TO_EMIT);
-#endif
-}
-
-static void wait (int count)
-{
-  int i;
-
-  for (i = 0; i < count; i++)
-    asm volatile ("" : : "r" (i) : "memory");
-}
-
-
-static void
-usb_lld_sys_shutdown (void)
-{
-  RCC->APB1ENR &= ~RCC_APB1ENR_USBEN;
-  RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
-  usb_cable_config (0);
-}
-
-static void
-usb_lld_sys_init (void)
-{
-  if ((RCC->APB1ENR & RCC_APB1ENR_USBEN)
-      && (RCC->APB1RSTR & RCC_APB1RSTR_USBRST) == 0)
-    /* Make sure the device is disconnected, even after core reset.  */
-    {
-      usb_lld_sys_shutdown ();
-      /* Disconnect requires SE0 (>= 2.5uS).  */
-      wait (300);
-    }
-
-  usb_cable_config (1);
-  RCC->APB1ENR |= RCC_APB1ENR_USBEN;
-  nvic_enable_vector (USB_LP_CAN1_RX0_IRQn,
-		      CORTEX_PRIORITY_MASK (STM32_USB_IRQ_PRIORITY));
-  /*
-   * Note that we also have other IRQ(s):
-   * 	USB_HP_CAN1_TX_IRQn (for double-buffered or isochronous)
-   * 	USBWakeUp_IRQn (suspend/resume)
-   */
-  RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
-  RCC->APB1RSTR = 0;
-}
-
-#define FLASH_KEY1               0x45670123UL
-#define FLASH_KEY2               0xCDEF89ABUL
-
-enum flash_status
-{
-  FLASH_BUSY = 1,
-  FLASH_ERROR_PG,
-  FLASH_ERROR_WRP,
-  FLASH_COMPLETE,
-  FLASH_TIMEOUT
-};
-
-static void __attribute__ ((used))
-flash_unlock (void)
-{
-  FLASH->KEYR = FLASH_KEY1;
-  FLASH->KEYR = FLASH_KEY2;
-}
-
-
-#define intr_disable()  asm volatile ("cpsid   i" : : : "memory")
-#define intr_enable()  asm volatile ("cpsie   i" : : : "memory")
-
-#define FLASH_SR_BSY		0x01
-#define FLASH_SR_PGERR		0x04
-#define FLASH_SR_WRPRTERR	0x10
-#define FLASH_SR_EOP		0x20
-
-#define FLASH_CR_PG	0x0001
-#define FLASH_CR_PER	0x0002
-#define FLASH_CR_MER	0x0004
-#define FLASH_CR_OPTPG	0x0010
-#define FLASH_CR_OPTER	0x0020
-#define FLASH_CR_STRT	0x0040
-#define FLASH_CR_LOCK	0x0080
-#define FLASH_CR_OPTWRE	0x0200
-#define FLASH_CR_ERRIE	0x0400
-#define FLASH_CR_EOPIE	0x1000
-
-static int
-flash_wait_for_last_operation (uint32_t timeout)
-{
-  int status;
-
-  do
-    {
-      status = FLASH->SR;
-      if (--timeout == 0)
-	break;
-    }
-  while ((status & FLASH_SR_BSY) != 0);
-
-  return status & (FLASH_SR_BSY|FLASH_SR_PGERR|FLASH_SR_WRPRTERR);
-}
-
-#define FLASH_PROGRAM_TIMEOUT 0x00010000
-#define FLASH_ERASE_TIMEOUT   0x01000000
-
-static int
-flash_program_halfword (uint32_t addr, uint16_t data)
-{
-  int status;
-
-  status = flash_wait_for_last_operation (FLASH_PROGRAM_TIMEOUT);
-
-  intr_disable ();
-  if (status == 0)
-    {
-      FLASH->CR |= FLASH_CR_PG;
-
-      *(volatile uint16_t *)addr = data;
-
-      status = flash_wait_for_last_operation (FLASH_PROGRAM_TIMEOUT);
-      FLASH->CR &= ~FLASH_CR_PG;
-    }
-  intr_enable ();
-
-  return status;
-}
-
-static int
-flash_erase_page (uint32_t addr)
-{
-  int status;
-
-  status = flash_wait_for_last_operation (FLASH_ERASE_TIMEOUT);
-
-  intr_disable ();
-  if (status == 0)
-    {
-      FLASH->CR |= FLASH_CR_PER;
-      FLASH->AR = addr;
-      FLASH->CR |= FLASH_CR_STRT;
-
-      status = flash_wait_for_last_operation (FLASH_ERASE_TIMEOUT);
-      FLASH->CR &= ~FLASH_CR_PER;
-    }
-  intr_enable ();
-
-  return status;
-}
-
-static int
-flash_check_blank (const uint8_t *p_start, size_t size)
-{
-  const uint8_t *p;
-
-  for (p = p_start; p < p_start + size; p++)
-    if (*p != 0xff)
-      return 0;
-
-  return 1;
-}
-
-extern uint8_t __flash_start__, __flash_end__;
-
-static int
-flash_write (uint32_t dst_addr, const uint8_t *src, size_t len)
-{
-  int status;
-  uint32_t flash_start = (uint32_t)&__flash_start__;
-  uint32_t flash_end = (uint32_t)&__flash_end__;
-
-  if (dst_addr < flash_start || dst_addr + len > flash_end)
-    return 0;
-
-  while (len)
-    {
-      uint16_t hw = *src++;
-
-      hw |= (*src++ << 8);
-      status = flash_program_halfword (dst_addr, hw);
-      if (status != 0)
-	return 0;		/* error return */
-
-      dst_addr += 2;
-      len -= 2;
-    }
-
-  return 1;
-}
-
-#define OPTION_BYTES_ADDR 0x1ffff800
-
-static int
-flash_protect (void)
-{
-  int status;
-  uint32_t option_bytes_value;
-
-  status = flash_wait_for_last_operation (FLASH_ERASE_TIMEOUT);
-
-  intr_disable ();
-  if (status == 0)
-    {
-      FLASH->OPTKEYR = FLASH_KEY1;
-      FLASH->OPTKEYR = FLASH_KEY2;
-
-      FLASH->CR |= FLASH_CR_OPTER;
-      FLASH->CR |= FLASH_CR_STRT;
-
-      status = flash_wait_for_last_operation (FLASH_ERASE_TIMEOUT);
-      FLASH->CR &= ~FLASH_CR_OPTER;
-    }
-  intr_enable ();
-
-  if (status != 0)
-    return 0;
-
-  option_bytes_value = *(uint32_t *)OPTION_BYTES_ADDR;
-  return (option_bytes_value & 0xff) == 0xff ? 1 : 0;
-}
-
-static void __attribute__((naked))
-flash_erase_all_and_exec (void (*entry)(void))
-{
-  uint32_t addr = (uint32_t)&__flash_start__;
-  uint32_t end = (uint32_t)&__flash_end__;
-  int r;
-
-  while (addr < end)
-    {
-      r = flash_erase_page (addr);
-      if (r != 0)
-	break;
-
-      addr += FLASH_PAGE_SIZE;
-    }
-
-  if (addr >= end)
-    (*entry) ();
-
-  for (;;);
-}
-
-struct SCB
-{
-  volatile uint32_t CPUID;
-  volatile uint32_t ICSR;
-  volatile uint32_t VTOR;
-  volatile uint32_t AIRCR;
-  volatile uint32_t SCR;
-  volatile uint32_t CCR;
-  volatile uint8_t  SHP[12];
-  volatile uint32_t SHCSR;
-  volatile uint32_t CFSR;
-  volatile uint32_t HFSR;
-  volatile uint32_t DFSR;
-  volatile uint32_t MMFAR;
-  volatile uint32_t BFAR;
-  volatile uint32_t AFSR;
-  volatile uint32_t PFR[2];
-  volatile uint32_t DFR;
-  volatile uint32_t ADR;
-  volatile uint32_t MMFR[4];
-  volatile uint32_t ISAR[5];
-};
-
-#define SCS_BASE	(0xE000E000)
-#define SCB_BASE	(SCS_BASE +  0x0D00)
-static struct SCB *const SCB = ((struct SCB *const) SCB_BASE);
-
-#define SYSRESETREQ 0x04
-static void
-nvic_system_reset (void)
-{
-  SCB->AIRCR = (0x05FA0000 | (SCB->AIRCR & 0x70) | SYSRESETREQ);
-  asm volatile ("dsb");
-  for (;;);
-}
-
-static void __attribute__ ((naked))
-reset (void)
-{
-  extern const unsigned long *FT0, *FT1, *FT2;
-
-  /*
-   * This code may not be at the start of flash ROM, because of DFU.
-   * So, we take the address from PC.
-   */
-  asm volatile ("cpsid	i\n\t"		/* Mask all interrupts. */
-		"ldr	r0, 1f\n\t"     /* r0 = SCR */
-		"mov	r1, pc\n\t"	/* r1 = (PC + 0x1000) & ~0x0fff */
-		"mov	r2, #0x1000\n\t"
-		"add	r1, r1, r2\n\t"
-		"sub	r2, r2, #1\n\t"
-		"bic	r1, r1, r2\n\t"
-		"str	r1, [r0, #8]\n\t"	/* Set SCR->VCR */
-		"ldr	r0, [r1], #4\n\t"
-		"msr	MSP, r0\n\t"	/* Main (exception handler) stack. */
-		"ldr	r0, [r1]\n\t"	/* Reset handler.                  */
-		"bx	r0\n\t"
-		".align	2\n"
-	"1:	.word	0xe000ed00"
-		: /* no output */ : /* no input */ : "memory");
-
-  /* Never reach here. */
-  /* Artificial entry to refer FT0, FT1, and FT2.  */
-  asm volatile (""
-		: : "r" (FT0), "r" (FT1), "r" (FT2));
-}
-
-typedef void (*handler)(void);
-extern uint8_t __ram_end__;
-
-handler vector[] __attribute__ ((section(".vectors"))) = {
-  (handler)&__ram_end__,
-  reset,
-  (handler)set_led,
-  flash_unlock,
-  (handler)flash_program_halfword,
-  (handler)flash_erase_page,
-  (handler)flash_check_blank,
-  (handler)flash_write,
-  (handler)flash_protect,
-  (handler)flash_erase_all_and_exec,
-  usb_lld_sys_init,
-  usb_lld_sys_shutdown,
-  nvic_system_reset,
-  clock_init,
-  gpio_init_primer2,
-  NULL,
-};
-
-const uint8_t sys_version[8] __attribute__((section(".sys.version"))) = {
-  3*2+2,	     /* bLength */
-  0x03,		     /* bDescriptorType = USB_STRING_DESCRIPTOR_TYPE*/
-  /* sys version: "2.0" */
-  '2', 0, '.', 0, '0', 0,
-};
--- a/example-primer2/sys.h
+++ b/example-primer2/sys.h
@@ -1,115 +0,0 @@
-extern const uint8_t sys_version[8];
-
-typedef void (*handler)(void);
-extern handler vector[16];
-
-static inline const uint8_t *
-unique_device_id (void)
-{
-  /* STM32F103 has 96-bit unique device identifier */
-  const uint8_t *addr = (const uint8_t *)0x1ffff7e8;
-
-  return addr;
-}
-
-static inline void
-set_led (int on)
-{
-  void (*func) (int) = (void (*)(int))vector[2];
-
-  return (*func) (on);
-}
-
-static inline void
-flash_unlock (void)
-{
-  (*vector[3]) ();
-}
-
-static inline int
-flash_program_halfword (uint32_t addr, uint16_t data)
-{
-  int (*func) (uint32_t, uint16_t) = (int (*)(uint32_t, uint16_t))vector[4];
-
-  return (*func) (addr, data);
-}
-
-static inline int
-flash_erase_page (uint32_t addr)
-{
-  int (*func) (uint32_t) = (int (*)(uint32_t))vector[5];
-
-  return (*func) (addr);
-}
-
-static inline int
-flash_check_blank (const uint8_t *p_start, size_t size)
-{
-  int (*func) (const uint8_t *, int) = (int (*)(const uint8_t *, int))vector[6];
-
-  return (*func) (p_start, size);
-}
-
-static inline int
-flash_write (uint32_t dst_addr, const uint8_t *src, size_t len)
-{
-  int (*func) (uint32_t, const uint8_t *, size_t)
-    = (int (*)(uint32_t, const uint8_t *, size_t))vector[7];
-
-  return (*func) (dst_addr, src, len);
-}
-
-static inline int
-flash_protect (void)
-{
-  int (*func) (void) = (int (*)(void))vector[8];
-
-  return (*func) ();
-}
-
-static inline void __attribute__((noreturn))
-flash_erase_all_and_exec (void (*entry)(void))
-{
-  void (*func) (void (*)(void)) = (void (*)(void (*)(void)))vector[9];
-
-  (*func) (entry);
-  for (;;);
-}
-
-static inline void
-usb_lld_sys_init (void)
-{
-  (*vector[10]) ();
-}
-
-static inline void
-usb_lld_sys_shutdown (void)
-{
-  (*vector[11]) ();
-}
-
-static inline void
-nvic_system_reset (void)
-{
-  (*vector[12]) ();
-}
-
-/*
- * Users can override INLINE by 'attribute((used))' to have an
- * implementation defined.
- */
-#if !defined(INLINE)
-#define INLINE __inline__
-#endif
-
-static INLINE void
-clock_init (void)
-{
-  (*vector[13]) ();
-}
-
-static INLINE void
-gpio_init (void)
-{
-  (*vector[14]) ();
-}
--- a/mcu/ABOUT-SYS
+++ b/mcu/ABOUT-SYS
@@ -0,0 +1,239 @@
+Consideration about SYS and the first pages of flash ROM
+========================================================
+
+Now, I'm developing something like SYS for Kinetis L MCU, so, I write
+this document.
+
+* Compatibility
+
+  SYS 1.0: The first verson
+  SYS 2.0: Added clock_init, gpio_init 
+  SYS 2.1: Added sys_board_id, sys_board_name 
+  SYS 3.0: Don't setup NVIC priority by usb_lld_sys_init
+
+
+* Macro definition by DEFS in Makefile
+
+  - USE_SYS_CLOCK_GPIO_SETTING
+
+    Define this macro to ask chopstx/entry.c (the runtime code before
+    MAIN function) to use function entries in SYS for clock_init and
+    gpio_init.
+
+    If not defined, entry.c includes the code for clock_init and
+    gpio_init which might be different to a board, and use them (entries
+    in SYS will not be used).  This works well with the ROM of SYS
+    1.0.
+
+    Note that SYS entries of clock_init and gpio_init were introduced
+    in SYS 2.0.  So, enable this macro only if the ROM is SYS 2.0 or
+    later.
+
+  - USE_SYS_BOARD_ID
+
+    Define this macro in a driver to get "sys_board_id" in SYS, so
+    that the driver can support various boards at runtime by changing
+    the settings according to the board.
+
+    A simple driver could only support a single board, by the compile
+    time (BOARD_ID in board-*.h) choice of of a settings.
+
+    Note that SYS entries of sys_board_id and sys_board_name were
+    introduced in SYS 2.1.  So, enable this macro only if the ROM is
+    SYS 2.1 or later.
+
+  - USE_SYS3
+
+    By defining this, it will have same effect of defining both of
+    USE_SYS_CLOCK_GPIO_SETTING and USE_SYS_BOARD_ID internally.
+
+
+About SYS on STM32F103
+======================
+
+In the development of Gnuk, we developed:
+
+	SYS: The system predefined routines for STM32F103
+
+It is now maintained as example-cdc/sys.c.
+
+There is another version in example-led/sys.c, which also support
+STM32F030, as well as STM32F103.  But, it wouldn't be useful for
+STM32F030.  In fact, the file example-fsm-55/sys.c has name sys.c
+but it doesn't include any system routines.
+
+The original issue was:
+
+    (1) When it's protected, STM32F103 can't change the first 4KiB of
+        flash ROM at run time.
+
+    (2) We want to support firmware upgrade through its USB.
+
+Later on, we add another point.
+
+    (3) It is good if the executable of Gnuk could be shared among
+        different boards.
+
+For (1) and (2), we decided put some useful routines and data which is
+not need to be changed.
+
+Now, the first 4KiB of flash ROM consists of:
+
+     1KiB: SYS
+     3KiB: 3/4 of AES forward tables
+
+SYS consists of:
+
+  Internal: reset entry, end of RAM
+  Data: board identification
+  Routines: board specific
+            board independent
+
+and here is the list of all.
+
+* Internal routines
+
+  reset entry
+  end of RAM
+
+* Board identification
+
+  sys_version
+  sys_board_id
+  sys_board_name
+
+* Board specific routines
+
+  * led
+    set_led
+
+  * mcu/board lower level
+    clock_init
+    gpio_init
+
+  * usb
+    usb_lld_sys_init
+    usb_lld_sys_shutdown
+
+* Board independent routines
+
+  * flash ROM access routines
+
+    unlock
+    write halfword
+    erase page
+    brank check
+    write page
+    protect
+    erase_all & exec to ram
+
+  * system reset routine
+
+    nvic_system_reset
+
+The routines of clock_init and gpio_init are here because of some
+historical reasons.  (We could design a system with no such exported
+routines: by defining: those things done internally after reset and
+before calling the application.)
+
+Those are exported as entries of SYS, and it is the responsibility of
+the application which do initialize clock and GPIO, calling those
+routines.
+
+USB routines are needed because of hardware practice of STM32F103.
+With STM32F103, each board has different way for handling the pull up
+of USB D+ and how the device asks re-enumeration to host PC.  In my
+opinion, if it's defined as full speed device and it's OK for us not
+to use high impedance (but asserting to LOW, instead) of D+ to ask
+re-enumeration, we can just pull up D+ always.  And we wouldn't need
+such routines in SYS.
+
+
+
+About SYS on Kinetis L
+======================
+
+For Kinetis L, because it's ROM has the original firmware upgrade
+support by the vendor (though USB HID), all that we needed for
+firmware upgrade would be just erasing to factory settings.
+
+And it has no limitation like STM32F103's first 4KiB flash ROM.
+All pages can be updated at run time.
+
+Nevertheless, the first two pages (2KiB) of KL27Z is still difficult
+to use.
+
+So, I decide to introduce something like SYS for Kinetis L.
+
+
+* Layout
+
+Three pages (3KiB) usage:
+
+  ------------ The first page
+  End of RAM <-- not used but hardware defines this
+  Address of reset entry
+  sys_version
+  sys_board_info (id, name)
+  sys_vector
+
+  other SYS routines and data...
+
+  ------------ The second page
+  FLASH CONFIG: 16-byte
+  Reset entry function
+  flash routines
+  CRC-32 routines
+  CRC-32 table (768-byte of CRC-32 table)
+
+  ------------ The third page
+  MAGIC 256-byte (256-byte of the last part of CRC-32 table)
+  ...
+  vectors (initial MSP, reset, ...) 
+  ...
+
+
+* data: Board identification
+
+  sys_version
+  sys_board_id
+  sys_board_name ; null terminated
+
+* Board specific routines
+
+  * mcu/board lower level
+    clock_init
+    gpio_init
+
+  * led
+    set_led
+
+* data: Board independent routines
+
+  * flash ROM access code to be loaded on to RAM
+
+* system reset routine???
+
+    nvic_system_reset
+
+
+* data: vectors for routines and data
+  sys_version
+  sys_board_id
+  address of sys_board_name
+  address of set_led
+  address of clock_init 
+  address of gpio_init 
+  address of ...
+
+
+
+An Example of No-use of SYS
+===========================
+
+See example-fsm-55 for an example of no use of SYS.
+
+While chopstx/entry.c defines vectors in ROM and RAM, those are simply
+discarded by example-fsm-55/hacker-emblem.ld.
+
+--
--- a/mcu/clk_gpio_init-mkl27z.c
+++ b/mcu/clk_gpio_init-mkl27z.c
@@ -0,0 +1,104 @@
+/*
+ * clk_gpio_init-mkl27z.c - Clock and GPIO initialization for Kinetis L.
+ *
+ * Copyright (C) 2016  Flying Stone Technology
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <mcu/mkl27z.h>
+
+struct MCG {
+  volatile uint8_t C1;   /* MCG Control Register 1             */
+  volatile uint8_t C2;   /* MCG Control Register 2             */
+  uint8_t reserved0[4];  /*                                    */
+  volatile uint8_t S;    /* MCG Status Register                */
+  uint8_t reserved1[1];  /*                                    */
+  volatile uint8_t SC;   /* MCG Status and Control Register    */
+  uint8_t reserved2[15]; /*                                    */
+  volatile uint8_t MC;   /* MCG Miscellaneous Control Register */
+};
+static struct MCG *const MCG = (struct MCG *)0x40064000;
+
+struct USB_CLK_RECOVER {
+  volatile uint8_t CTRL;           /* USB Clock             */
+  uint8_t rsvd38[3];               /*     recovery control  */
+  volatile uint8_t IRC_EN;         /* IRC48M oscillator     */
+  uint8_t rsvd39[3];               /*     enable register   */
+  volatile uint8_t INT_EN;         /* Clock recovery        */
+  uint8_t rsvd40[3];               /*     interrupt enable  */
+  volatile uint8_t INT_STATUS;     /* Clock recovery        */
+                                   /*     interrupt status  */
+};
+static struct USB_CLK_RECOVER *const USB_CLK_RECOVER =
+  (struct USB_CLK_RECOVER *)0x40072140;
+
+static void __attribute__((used))
+clock_init (void)
+{
+  SIM->CLKDIV1 = (SIM->CLKDIV1 & 0xF0070000)
+               | (1 << 16)	/* OUTDIV4 = 001: Divide-by-2 */
+               ;
+
+  MCG->MC = 0x80; /* HIRC Enable, LIRC_DIV2=000: Division factor=1 */
+  MCG->C1 = 0x00; /* Select HIRC clock, LIRC disabled. */
+  /* Make sure HIRC clock is selected.  */
+  while ((MCG->S & 0x0c) != 0)
+    ;
+
+  /* TPMSRC=IRC48M, USBSRC=IRC48M, CLOKOUTSEL=LPO, RTC-clock */
+  SIM->SOPT2 = 0x01040060;
+
+  SIM->SCGC4 = (1 << 18);	/* Enable USB FS clock        */
+  SIM->SCGC5 = (1 << 10);	/* Enable Port B clock        */
+  SIM->SCGC6 = (1 << 25)|1;	/* Enable TPM1 clock          */
+  SIM->COPC = 0;		/* COP disabled               */
+
+  /* Crystal-less USB setup.  */
+  USB_CLK_RECOVER->IRC_EN = 0x02;
+  USB_CLK_RECOVER->CTRL = 0x80;
+}
+
+
+static void __attribute__((used))
+gpio_init (void)
+{
+  PORTB->PCR0 = (1<<8) /* GPIO                  */
+              | (0<<6) /* DriveStrengthEnable=0 */
+              | (0<<4) /* PassiveFilterEnable=0 */
+              | (1<<2) /* SlewRateEnable = slow */
+              | (0<<1) /* pull enable = 0       */ 
+              | (0<<0) /* pull up select= 0     */
+              ;
+  PORTB->PCR1 = (1<<8) /* GPIO                  */
+              | (0<<6) /* DriveStrengthEnable=0 */
+              | (0<<4) /* PassiveFilterEnable=0 */
+              | (1<<2) /* SlewRateEnable = slow */
+              | (0<<1) /* pull enable = 0       */ 
+              | (0<<0) /* pull up select= 0     */
+              ;
+
+  GPIOB->PDDR = (1 << 1) | (1 << 0); /* PTB0, PTB1 : Output    */
+  GPIOB->PSOR = (1 << 0);            /* PTB0: Set  : Light off */
+  GPIOB->PCOR = (1 << 1);            /* PTB1: Clear: Output 0  */
+}
--- a/mcu/clk_gpio_init-stm32.c
+++ b/mcu/clk_gpio_init-stm32.c
@@ -1,5 +1,5 @@
 /*
- * clk_gpio_init.c - Clock and GPIO initialization.
+ * clk_gpio_init-stm32.c - Clock and GPIO initialization for STM32.
 *
 * Copyright (C) 2015  Flying Stone Technology
 * Author: NIIBE Yutaka <gniibe@fsij.org>
@@ -100,7 +100,7 @@ struct RCC {
 };

 #define RCC_BASE		(AHBPERIPH_BASE + 0x1000)
-static struct RCC *const RCC = ((struct RCC *const)RCC_BASE);
+static struct RCC *const RCC = (struct RCC *)RCC_BASE;

 #define RCC_APB1ENR_USBEN	0x00800000
 #define RCC_APB1RSTR_USBRST	0x00800000
@@ -163,7 +163,7 @@ struct SYSCFG {
 #define SYSCFG_CFGR1_MEM_MODE 0x03

 #define SYSCFG_BASE	(APBPERIPH_BASE + 0x00010000)
-static struct SYSCFG *const SYSCFG = ((struct SYSCFG *const) SYSCFG_BASE);
+static struct SYSCFG *const SYSCFG = (struct SYSCFG *)SYSCFG_BASE;
 #endif

 struct FLASH {
@@ -179,7 +179,7 @@ struct FLASH {
 };

 #define FLASH_R_BASE	(AHBPERIPH_BASE + 0x2000)
-static struct FLASH *const FLASH = ((struct FLASH *const) FLASH_R_BASE);
+static struct FLASH *const FLASH = (struct FLASH *)FLASH_R_BASE;

 static void __attribute__((used))
 clock_init (void)
@@ -231,7 +231,7 @@ clock_init (void)
  RCC->APB2RSTR = RCC_APB2RSTR_SYSCFGRST;
  RCC->APB2RSTR = 0;

-# if defined(HAVE_SYS_H)
+# if defined(STM32F0_USE_VECTOR_ON_RAM)
  /* Use vectors on RAM */
  SYSCFG->CFGR1 = (SYSCFG->CFGR1 & ~SYSCFG_CFGR1_MEM_MODE) | 3;
 # endif
@@ -279,7 +279,7 @@ struct AFIO
 };

 #define AFIO_BASE 0x40010000
-static struct AFIO *const AFIO = (struct AFIO *const)AFIO_BASE;
+static struct AFIO *const AFIO = (struct AFIO *)AFIO_BASE;

 #define AFIO_MAPR_TIM3_REMAP_PARTIALREMAP 0x00000800
 #define AFIO_MAPR_SWJ_CFG_DISABLE         0x04000000
@@ -308,12 +308,12 @@ struct GPIO {
 #define GPIOE		((struct GPIO *) GPIOE_BASE)
 #endif

-static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
+static struct GPIO *const GPIO_LED = (struct GPIO *)GPIO_LED_BASE;
 #ifdef GPIO_USB_BASE
-static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
+static struct GPIO *const GPIO_USB = (struct GPIO *)GPIO_USB_BASE;
 #endif
 #ifdef GPIO_OTHER_BASE
-static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
+static struct GPIO *const GPIO_OTHER = (struct GPIO *)GPIO_OTHER_BASE;
 #endif

 static void __attribute__((used))
--- a/mcu/mkl27z.h
+++ b/mcu/mkl27z.h
@@ -0,0 +1,70 @@
+/* System Integration Module.  */
+struct SIM {
+  volatile uint32_t SOPT1;    /* System Options Register 1               */
+  volatile uint32_t SOPT1CFG; /* SOPT1 Configuration Register            */
+  uint32_t reserved0[1023];   /*                                         */
+  volatile uint32_t SOPT2;    /* System Options Register 2               */
+  uint32_t reserved1[1];      /*                                         */
+  volatile uint32_t SOPT4;    /* System Options Register 4               */
+  volatile uint32_t SOPT5;    /* System Options Register 5               */
+  uint32_t reserved2[1];      /*                                         */
+  volatile uint32_t SOPT7;    /* System Options Register 7               */
+  uint32_t reserved3[2];       /*                                         */
+  volatile uint32_t SDID;     /* System Device Identification Register   */
+  uint32_t reserved4[3];      /*                                         */
+  volatile uint32_t SCGC4;    /* System Clock Gating Control Register 4  */
+  volatile uint32_t SCGC5;    /* System Clock Gating Control Register 5  */
+  volatile uint32_t SCGC6;    /* System Clock Gating Control Register 6  */
+  volatile uint32_t SCGC7;    /* System Clock Gating Control Register 7  */
+  volatile uint32_t CLKDIV1;  /* System Clock Divider Register 1         */
+  uint32_t reserved5[1];      /*                                         */
+  volatile uint32_t FCFG1;    /* Flash Configuration Register 1          */
+  volatile uint32_t FCFG2;    /* Flash Configuration Register 2          */
+  uint32_t reserved6[1];      /*                                         */
+  volatile uint32_t UIDMH;    /* Unique Identification Register Mid-High */
+  volatile uint32_t UIDML;    /* Unique Identification Register Mid Low  */
+  volatile uint32_t UIDL;     /* Unique Identification Register Low      */
+  uint32_t reserved7[39];     /*                                         */
+  volatile uint32_t COPC;     /* COP Control Register                    */
+  volatile uint32_t SRVCOP;   /* Service COP                             */
+};
+
+/* Port control. */
+struct PORT {
+  volatile uint32_t PCR0;  volatile uint32_t PCR1;
+  volatile uint32_t PCR2;  volatile uint32_t PCR3;
+  volatile uint32_t PCR4;  volatile uint32_t PCR5;
+  volatile uint32_t PCR6;  volatile uint32_t PCR7;
+  volatile uint32_t PCR8;  volatile uint32_t PCR9;
+  volatile uint32_t PCR10; volatile uint32_t PCR11;
+  volatile uint32_t PCR12; volatile uint32_t PCR13;
+  volatile uint32_t PCR14; volatile uint32_t PCR15;
+  volatile uint32_t PCR16; volatile uint32_t PCR17;
+  volatile uint32_t PCR18; volatile uint32_t PCR19;
+  volatile uint32_t PCR20; volatile uint32_t PCR21;
+  volatile uint32_t PCR22; volatile uint32_t PCR23;
+  volatile uint32_t PCR24; volatile uint32_t PCR25;
+  volatile uint32_t PCR26; volatile uint32_t PCR27;
+  volatile uint32_t PCR28; volatile uint32_t PCR29;
+  volatile uint32_t PCR30; volatile uint32_t PCR31;
+  volatile uint32_t GPCLR; volatile uint32_t GPCHR;
+  uint32_t reserved[6];
+  volatile uint32_t ISFR;
+};
+
+struct GPIO {
+  volatile uint32_t PDOR; /* Port Data Output Register    */
+  volatile uint32_t PSOR; /* Port Set Output Register     */
+  volatile uint32_t PCOR; /* Port Clear Output Register   */
+  volatile uint32_t PTOR; /* Port Toggle Output Register  */
+  volatile uint32_t PDIR; /* Port Data Input Register     */
+  volatile uint32_t PDDR; /* Port Data Direction Register */
+};
+
+static struct SIM *const SIM = (struct SIM *)0x40047000;
+static struct PORT *const PORTB = (struct PORT *)0x4004A000;
+static struct PORT *const PORTD = (struct PORT *)0x4004C000;
+static struct PORT *const PORTE = (struct PORT *)0x4004D000;
+static struct GPIO *const GPIOB = (struct GPIO *)0x400FF040;
+static struct GPIO *const GPIOD = (struct GPIO *)0x400FF0C0;
+static struct GPIO *const GPIOE = (struct GPIO *)0x400FF100;
--- a/mcu/stm32f103.h
+++ b/mcu/stm32f103.h
@@ -0,0 +1,700 @@
+#define PERIPH_BASE	0x40000000
+#define APB1PERIPH_BASE PERIPH_BASE
+#define APB2PERIPH_BASE	(PERIPH_BASE + 0x10000)
+#define AHBPERIPH_BASE	(PERIPH_BASE + 0x20000)
+
+struct RCC {
+  volatile uint32_t CR;
+  volatile uint32_t CFGR;
+  volatile uint32_t CIR;
+  volatile uint32_t APB2RSTR;
+  volatile uint32_t APB1RSTR;
+  volatile uint32_t AHBENR;
+  volatile uint32_t APB2ENR;
+  volatile uint32_t APB1ENR;
+  volatile uint32_t BDCR;
+  volatile uint32_t CSR;
+};
+
+#define RCC_BASE		(AHBPERIPH_BASE + 0x1000)
+static struct RCC *const RCC = (struct RCC *)RCC_BASE;
+
+#define RCC_AHBENR_DMA1EN       0x00000001
+#define RCC_AHBENR_CRCEN        0x00000040
+
+#define RCC_APB2ENR_ADC1EN      0x00000200
+#define RCC_APB2ENR_ADC2EN      0x00000400
+#define RCC_APB2ENR_TIM1EN      0x00000800
+#define RCC_APB1ENR_TIM2EN      0x00000001
+#define RCC_APB1ENR_TIM3EN      0x00000002
+#define RCC_APB1ENR_TIM4EN      0x00000004
+
+#define RCC_APB2RSTR_ADC1RST    0x00000200
+#define RCC_APB2RSTR_ADC2RST    0x00000400
+#define RCC_APB2RSTR_TIM1RST    0x00000800
+#define RCC_APB1RSTR_TIM2RST    0x00000001
+#define RCC_APB1RSTR_TIM3RST    0x00000002
+#define RCC_APB1RSTR_TIM4RST    0x00000004
+
+#define  CRC_CR_RESET                        0x00000001
+
+struct CRC {
+  volatile uint32_t DR;
+  volatile uint8_t  IDR;
+  uint8_t   RESERVED0;
+  uint16_t  RESERVED1;
+  volatile uint32_t CR;
+};
+
+#define CRC_BASE              (AHBPERIPH_BASE + 0x3000)
+static struct CRC *const CRC = (struct CRC *)CRC_BASE;
+
+
+struct ADC {
+  volatile uint32_t SR;
+  volatile uint32_t CR1;
+  volatile uint32_t CR2;
+  volatile uint32_t SMPR1;
+  volatile uint32_t SMPR2;
+  volatile uint32_t JOFR1;
+  volatile uint32_t JOFR2;
+  volatile uint32_t JOFR3;
+  volatile uint32_t JOFR4;
+  volatile uint32_t HTR;
+  volatile uint32_t LTR;
+  volatile uint32_t SQR1;
+  volatile uint32_t SQR2;
+  volatile uint32_t SQR3;
+  volatile uint32_t JSQR;
+  volatile uint32_t JDR1;
+  volatile uint32_t JDR2;
+  volatile uint32_t JDR3;
+  volatile uint32_t JDR4;
+  volatile uint32_t DR;
+};
+
+#define ADC1_BASE             (APB2PERIPH_BASE + 0x2400)
+#define ADC2_BASE             (APB2PERIPH_BASE + 0x2800)
+
+static struct ADC *const ADC1 = (struct ADC *)ADC1_BASE;
+static struct ADC *const ADC2 = (struct ADC *)ADC2_BASE;
+
+#define  ADC_CR1_DUALMOD_0       0x00010000
+#define  ADC_CR1_DUALMOD_1       0x00020000
+#define  ADC_CR1_DUALMOD_2       0x00040000
+#define  ADC_CR1_DUALMOD_3       0x00080000
+
+#define  ADC_CR1_SCAN            0x00000100
+
+#define  ADC_CR2_ADON            0x00000001
+#define  ADC_CR2_CONT            0x00000002
+#define  ADC_CR2_CAL             0x00000004
+#define  ADC_CR2_RSTCAL          0x00000008
+#define  ADC_CR2_DMA             0x00000100
+#define  ADC_CR2_ALIGN           0x00000800
+#define  ADC_CR2_EXTSEL          0x000E0000
+#define  ADC_CR2_EXTSEL_0        0x00020000
+#define  ADC_CR2_EXTSEL_1        0x00040000
+#define  ADC_CR2_EXTSEL_2        0x00080000
+#define  ADC_CR2_EXTTRIG         0x00100000
+#define  ADC_CR2_SWSTART         0x00400000
+#define  ADC_CR2_TSVREFE         0x00800000
+
+struct DMA_Channel {
+  volatile uint32_t CCR;
+  volatile uint32_t CNDTR;
+  volatile uint32_t CPAR;
+  volatile uint32_t CMAR;
+};
+
+struct DMA {
+  volatile uint32_t ISR;
+  volatile uint32_t IFCR;
+};
+
+#define STM32_DMA_CR_MINC           DMA_CCR1_MINC
+#define STM32_DMA_CR_MSIZE_WORD     DMA_CCR1_MSIZE_1
+#define STM32_DMA_CR_PSIZE_WORD     DMA_CCR1_PSIZE_1
+#define STM32_DMA_CR_TCIE           DMA_CCR1_TCIE
+#define STM32_DMA_CR_TEIE           DMA_CCR1_TEIE
+#define STM32_DMA_CR_HTIE           DMA_CCR1_HTIE
+#define STM32_DMA_ISR_TEIF          DMA_ISR_TEIF1
+#define STM32_DMA_ISR_HTIF          DMA_ISR_HTIF1
+#define STM32_DMA_ISR_TCIF          DMA_ISR_TCIF1
+
+#define STM32_DMA_ISR_MASK          0x0F
+#define STM32_DMA_CCR_RESET_VALUE   0x00000000
+#define STM32_DMA_CR_PL_MASK        DMA_CCR1_PL
+#define STM32_DMA_CR_PL(n)          ((n) << 12)
+
+#define  DMA_CCR1_EN                         0x00000001
+#define  DMA_CCR1_TCIE                       0x00000002
+#define  DMA_CCR1_HTIE                       0x00000004
+#define  DMA_CCR1_TEIE                       0x00000008
+#define  DMA_CCR1_DIR                        0x00000010
+#define  DMA_CCR1_CIRC                       0x00000020
+#define  DMA_CCR1_PINC                       0x00000040
+#define  DMA_CCR1_MINC                       0x00000080
+#define  DMA_CCR1_PSIZE                      0x00000300
+#define  DMA_CCR1_PSIZE_0                    0x00000100
+#define  DMA_CCR1_PSIZE_1                    0x00000200
+#define  DMA_CCR1_MSIZE                      0x00000C00
+#define  DMA_CCR1_MSIZE_0                    0x00000400
+#define  DMA_CCR1_MSIZE_1                    0x00000800
+#define  DMA_CCR1_PL                         0x00003000
+#define  DMA_CCR1_PL_0                       0x00001000
+#define  DMA_CCR1_PL_1                       0x00002000
+#define  DMA_CCR1_MEM2MEM                    0x00004000
+
+#define  DMA_ISR_GIF1                        0x00000001
+#define  DMA_ISR_TCIF1                       0x00000002
+#define  DMA_ISR_HTIF1                       0x00000004
+#define  DMA_ISR_TEIF1                       0x00000008
+#define  DMA_ISR_GIF2                        0x00000010
+#define  DMA_ISR_TCIF2                       0x00000020
+#define  DMA_ISR_HTIF2                       0x00000040
+#define  DMA_ISR_TEIF2                       0x00000080
+#define  DMA_ISR_GIF3                        0x00000100
+#define  DMA_ISR_TCIF3                       0x00000200
+#define  DMA_ISR_HTIF3                       0x00000400
+#define  DMA_ISR_TEIF3                       0x00000800
+#define  DMA_ISR_GIF4                        0x00001000
+#define  DMA_ISR_TCIF4                       0x00002000
+#define  DMA_ISR_HTIF4                       0x00004000
+#define  DMA_ISR_TEIF4                       0x00008000
+#define  DMA_ISR_GIF5                        0x00010000
+#define  DMA_ISR_TCIF5                       0x00020000
+#define  DMA_ISR_HTIF5                       0x00040000
+#define  DMA_ISR_TEIF5                       0x00080000
+#define  DMA_ISR_GIF6                        0x00100000
+#define  DMA_ISR_TCIF6                       0x00200000
+#define  DMA_ISR_HTIF6                       0x00400000
+#define  DMA_ISR_TEIF6                       0x00800000
+#define  DMA_ISR_GIF7                        0x01000000
+#define  DMA_ISR_TCIF7                       0x02000000
+#define  DMA_ISR_HTIF7                       0x04000000
+#define  DMA_ISR_TEIF7                       0x08000000
+
+#define DMA1_BASE             (AHBPERIPH_BASE + 0x0000)
+static struct DMA *const DMA1 = (struct DMA *)DMA1_BASE;
+
+#define DMA1_Channel1_BASE    (AHBPERIPH_BASE + 0x0008)
+static struct DMA_Channel *const DMA1_Channel1 =
+  (struct DMA_Channel *)DMA1_Channel1_BASE;
+
+/* System Control Block */
+struct SCB
+{
+  volatile uint32_t CPUID;
+  volatile uint32_t ICSR;
+  volatile uint32_t VTOR;
+  volatile uint32_t AIRCR;
+  volatile uint32_t SCR;
+  volatile uint32_t CCR;
+  volatile uint8_t  SHP[12];
+  volatile uint32_t SHCSR;
+  volatile uint32_t CFSR;
+  volatile uint32_t HFSR;
+  volatile uint32_t DFSR;
+  volatile uint32_t MMFAR;
+  volatile uint32_t BFAR;
+  volatile uint32_t AFSR;
+  volatile uint32_t PFR[2];
+  volatile uint32_t DFR;
+  volatile uint32_t ADR;
+  volatile uint32_t MMFR[4];
+  volatile uint32_t ISAR[5];
+  uint32_t RESERVED0[5];
+  volatile uint32_t CPACR;
+};
+
+#define SCS_BASE 0xE000E000
+#define SCB_BASE (SCS_BASE + 0x0D00)
+static struct SCB *const SCB = (struct SCB *)SCB_BASE;
+
+/* Timer */
+struct TIM
+{
+  volatile uint16_t CR1;   uint16_t  RESERVED0;
+  volatile uint16_t CR2;   uint16_t  RESERVED1;
+  volatile uint16_t SMCR;  uint16_t  RESERVED2;
+  volatile uint16_t DIER;  uint16_t  RESERVED3;
+  volatile uint16_t SR;    uint16_t  RESERVED4;
+  volatile uint16_t EGR;   uint16_t  RESERVED5;
+  volatile uint16_t CCMR1; uint16_t  RESERVED6;
+  volatile uint16_t CCMR2; uint16_t  RESERVED7;
+  volatile uint16_t CCER;  uint16_t  RESERVED8;
+  volatile uint16_t CNT;   uint16_t  RESERVED9;
+  volatile uint16_t PSC;   uint16_t  RESERVED10;
+  volatile uint16_t ARR;   uint16_t  RESERVED11;
+  volatile uint16_t RCR;   uint16_t  RESERVED12;
+  volatile uint16_t CCR1;  uint16_t  RESERVED13;
+  volatile uint16_t CCR2;  uint16_t  RESERVED14;
+  volatile uint16_t CCR3;  uint16_t  RESERVED15;
+  volatile uint16_t CCR4;  uint16_t  RESERVED16;
+  volatile uint16_t BDTR;  uint16_t  RESERVED17;
+  volatile uint16_t DCR;   uint16_t  RESERVED18;
+  volatile uint16_t DMAR;  uint16_t  RESERVED19;
+};
+
+#define TIM2_BASE 0x40000000
+#define TIM3_BASE 0x40000400
+#define TIM4_BASE 0x40000800
+static struct TIM *const TIM2 = (struct TIM *)TIM2_BASE;
+static struct TIM *const TIM3 = (struct TIM *)TIM3_BASE;
+static struct TIM *const TIM4 = (struct TIM *)TIM4_BASE;
+
+#define  TIM_CR1_CEN   	0x0001
+#define  TIM_CR1_UDIS  	0x0002
+#define  TIM_CR1_URS   	0x0004
+#define  TIM_CR1_OPM   	0x0008
+#define  TIM_CR1_DIR   	0x0010
+#define  TIM_CR1_CMS   	0x0060
+#define  TIM_CR1_CMS_0 	0x0020
+#define  TIM_CR1_CMS_1 	0x0040
+#define  TIM_CR1_ARPE  	0x0080
+#define  TIM_CR1_CKD   	0x0300
+#define  TIM_CR1_CKD_0 	0x0100
+#define  TIM_CR1_CKD_1 	0x0200
+
+#define  TIM_CR2_CCPC  	0x0001
+#define  TIM_CR2_CCUS  	0x0004
+#define  TIM_CR2_CCDS  	0x0008
+#define  TIM_CR2_MMS   	0x0070
+#define  TIM_CR2_MMS_0 	0x0010
+#define  TIM_CR2_MMS_1 	0x0020
+#define  TIM_CR2_MMS_2 	0x0040
+#define  TIM_CR2_TI1S  	0x0080
+#define  TIM_CR2_OIS1  	0x0100
+#define  TIM_CR2_OIS1N 	0x0200
+#define  TIM_CR2_OIS2  	0x0400
+#define  TIM_CR2_OIS2N 	0x0800
+#define  TIM_CR2_OIS3  	0x1000
+#define  TIM_CR2_OIS3N 	0x2000
+#define  TIM_CR2_OIS4  	0x4000
+
+#define  TIM_SMCR_SMS   0x0007
+#define  TIM_SMCR_SMS_0 0x0001
+#define  TIM_SMCR_SMS_1 0x0002
+#define  TIM_SMCR_SMS_2 0x0004
+#define  TIM_SMCR_TS    0x0070
+#define  TIM_SMCR_TS_0  0x0010
+#define  TIM_SMCR_TS_1  0x0020
+#define  TIM_SMCR_TS_2  0x0040
+#define  TIM_SMCR_MSM   0x0080
+
+#define  TIM_SMCR_ETF   0x0F00
+#define  TIM_SMCR_ETF_0 0x0100
+#define  TIM_SMCR_ETF_1 0x0200
+#define  TIM_SMCR_ETF_2 0x0400
+#define  TIM_SMCR_ETF_3 0x0800
+
+#define  TIM_SMCR_ETPS   0x3000
+#define  TIM_SMCR_ETPS_0 0x1000
+#define  TIM_SMCR_ETPS_1 0x2000
+
+#define  TIM_SMCR_ECE    0x4000
+#define  TIM_SMCR_ETP    0x8000
+
+#define  TIM_DIER_UIE    0x0001
+#define  TIM_DIER_CC1IE  0x0002
+#define  TIM_DIER_CC2IE  0x0004
+#define  TIM_DIER_CC3IE  0x0008
+#define  TIM_DIER_CC4IE  0x0010
+#define  TIM_DIER_COMIE  0x0020
+#define  TIM_DIER_TIE    0x0040
+#define  TIM_DIER_BIE    0x0080
+#define  TIM_DIER_UDE    0x0100
+#define  TIM_DIER_CC1DE  0x0200
+#define  TIM_DIER_CC2DE  0x0400
+#define  TIM_DIER_CC3DE  0x0800
+#define  TIM_DIER_CC4DE  0x1000
+#define  TIM_DIER_COMDE  0x2000
+#define  TIM_DIER_TDE    0x4000
+
+#define  TIM_SR_UIF      0x0001
+#define  TIM_SR_CC1IF    0x0002
+#define  TIM_SR_CC2IF    0x0004
+#define  TIM_SR_CC3IF    0x0008
+#define  TIM_SR_CC4IF    0x0010
+#define  TIM_SR_COMIF    0x0020
+#define  TIM_SR_TIF      0x0040
+#define  TIM_SR_BIF      0x0080
+#define  TIM_SR_CC1OF    0x0200
+#define  TIM_SR_CC2OF    0x0400
+#define  TIM_SR_CC3OF    0x0800
+#define  TIM_SR_CC4OF    0x1000
+
+#define  TIM_EGR_UG      0x01
+#define  TIM_EGR_CC1G    0x02
+#define  TIM_EGR_CC2G    0x04
+#define  TIM_EGR_CC3G    0x08
+#define  TIM_EGR_CC4G    0x10
+#define  TIM_EGR_COMG    0x20
+#define  TIM_EGR_TG      0x40
+#define  TIM_EGR_BG      0x80
+
+#define  TIM_CCMR1_CC1S   0x0003
+#define  TIM_CCMR1_CC1S_0 0x0001
+#define  TIM_CCMR1_CC1S_1 0x0002
+
+#define  TIM_CCMR1_OC1FE  0x0004
+#define  TIM_CCMR1_OC1PE  0x0008
+
+#define  TIM_CCMR1_OC1M   0x0070
+#define  TIM_CCMR1_OC1M_0 0x0010
+#define  TIM_CCMR1_OC1M_1 0x0020
+#define  TIM_CCMR1_OC1M_2 0x0040
+
+#define  TIM_CCMR1_OC1CE  0x0080
+
+#define  TIM_CCMR1_CC2S   0x0300
+#define  TIM_CCMR1_CC2S_0 0x0100
+#define  TIM_CCMR1_CC2S_1 0x0200
+
+#define  TIM_CCMR1_OC2FE  0x0400
+#define  TIM_CCMR1_OC2PE  0x0800
+
+#define  TIM_CCMR1_OC2M   0x7000
+#define  TIM_CCMR1_OC2M_0 0x1000
+#define  TIM_CCMR1_OC2M_1 0x2000
+#define  TIM_CCMR1_OC2M_2 0x4000
+
+#define  TIM_CCMR1_OC2CE  0x8000
+
+
+#define  TIM_CCMR1_IC1PSC   0x000C
+#define  TIM_CCMR1_IC1PSC_0 0x0004
+#define  TIM_CCMR1_IC1PSC_1 0x0008
+
+#define  TIM_CCMR1_IC1F     0x00F0
+#define  TIM_CCMR1_IC1F_0   0x0010
+#define  TIM_CCMR1_IC1F_1   0x0020
+#define  TIM_CCMR1_IC1F_2   0x0040
+#define  TIM_CCMR1_IC1F_3   0x0080
+
+#define  TIM_CCMR1_IC2PSC   0x0C00
+#define  TIM_CCMR1_IC2PSC_0 0x0400
+#define  TIM_CCMR1_IC2PSC_1 0x0800
+
+#define  TIM_CCMR1_IC2F     0xF000
+#define  TIM_CCMR1_IC2F_0   0x1000
+#define  TIM_CCMR1_IC2F_1   0x2000
+#define  TIM_CCMR1_IC2F_2   0x4000
+#define  TIM_CCMR1_IC2F_3   0x8000
+
+#define  TIM_CCMR2_CC3S     0x0003
+#define  TIM_CCMR2_CC3S_0   0x0001
+#define  TIM_CCMR2_CC3S_1   0x0002
+
+#define  TIM_CCMR2_OC3FE    0x0004
+#define  TIM_CCMR2_OC3PE    0x0008
+
+#define  TIM_CCMR2_OC3M     0x0070
+#define  TIM_CCMR2_OC3M_0   0x0010
+#define  TIM_CCMR2_OC3M_1   0x0020
+#define  TIM_CCMR2_OC3M_2   0x0040
+
+#define  TIM_CCMR2_OC3CE    0x0080
+
+#define  TIM_CCMR2_CC4S     0x0300
+#define  TIM_CCMR2_CC4S_0   0x0100
+#define  TIM_CCMR2_CC4S_1   0x0200
+
+#define  TIM_CCMR2_OC4FE    0x0400
+#define  TIM_CCMR2_OC4PE    0x0800
+
+#define  TIM_CCMR2_OC4M     0x7000
+#define  TIM_CCMR2_OC4M_0   0x1000
+#define  TIM_CCMR2_OC4M_1   0x2000
+#define  TIM_CCMR2_OC4M_2   0x4000
+
+#define  TIM_CCMR2_OC4CE    0x8000
+
+
+#define  TIM_CCMR2_IC3PSC   0x000C
+#define  TIM_CCMR2_IC3PSC_0 0x0004
+#define  TIM_CCMR2_IC3PSC_1 0x0008
+
+#define  TIM_CCMR2_IC3F     0x00F0
+#define  TIM_CCMR2_IC3F_0   0x0010
+#define  TIM_CCMR2_IC3F_1   0x0020
+#define  TIM_CCMR2_IC3F_2   0x0040
+#define  TIM_CCMR2_IC3F_3   0x0080
+
+#define  TIM_CCMR2_IC4PSC   0x0C00
+#define  TIM_CCMR2_IC4PSC_0 0x0400
+#define  TIM_CCMR2_IC4PSC_1 0x0800
+
+#define  TIM_CCMR2_IC4F     0xF000
+#define  TIM_CCMR2_IC4F_0   0x1000
+#define  TIM_CCMR2_IC4F_1   0x2000
+#define  TIM_CCMR2_IC4F_2   0x4000
+#define  TIM_CCMR2_IC4F_3   0x8000
+
+#define  TIM_CCER_CC1E      0x0001
+#define  TIM_CCER_CC1P      0x0002
+#define  TIM_CCER_CC1NE     0x0004
+#define  TIM_CCER_CC1NP     0x0008
+#define  TIM_CCER_CC2E      0x0010
+#define  TIM_CCER_CC2P      0x0020
+#define  TIM_CCER_CC2NE     0x0040
+#define  TIM_CCER_CC2NP     0x0080
+#define  TIM_CCER_CC3E      0x0100
+#define  TIM_CCER_CC3P      0x0200
+#define  TIM_CCER_CC3NE     0x0400
+#define  TIM_CCER_CC3NP     0x0800
+#define  TIM_CCER_CC4E      0x1000
+#define  TIM_CCER_CC4P      0x2000
+
+#define  TIM_CNT_CNT        0xFFFF
+
+#define  TIM_PSC_PSC        0xFFFF
+
+#define  TIM_ARR_ARR        0xFFFF
+
+#define  TIM_RCR_REP        0xFF
+
+#define  TIM_CCR1_CCR1      0xFFFF
+#define  TIM_CCR2_CCR2      0xFFFF
+#define  TIM_CCR3_CCR3      0xFFFF
+#define  TIM_CCR4_CCR4      0xFFFF
+
+#define  TIM_BDTR_DTG       0x00FF
+#define  TIM_BDTR_DTG_0     0x0001
+#define  TIM_BDTR_DTG_1     0x0002
+#define  TIM_BDTR_DTG_2     0x0004
+#define  TIM_BDTR_DTG_3     0x0008
+#define  TIM_BDTR_DTG_4     0x0010
+#define  TIM_BDTR_DTG_5     0x0020
+#define  TIM_BDTR_DTG_6     0x0040
+#define  TIM_BDTR_DTG_7     0x0080
+
+#define  TIM_BDTR_LOCK      0x0300
+#define  TIM_BDTR_LOCK_0    0x0100
+#define  TIM_BDTR_LOCK_1    0x0200
+
+#define  TIM_BDTR_OSSI      0x0400
+#define  TIM_BDTR_OSSR      0x0800
+#define  TIM_BDTR_BKE       0x1000
+#define  TIM_BDTR_BKP       0x2000
+#define  TIM_BDTR_AOE       0x4000
+#define  TIM_BDTR_MOE       0x8000
+
+#define  TIM_DCR_DBA        0x001F
+#define  TIM_DCR_DBA_0      0x0001
+#define  TIM_DCR_DBA_1      0x0002
+#define  TIM_DCR_DBA_2      0x0004
+#define  TIM_DCR_DBA_3      0x0008
+#define  TIM_DCR_DBA_4      0x0010
+
+#define  TIM_DCR_DBL        0x1F00
+#define  TIM_DCR_DBL_0      0x0100
+#define  TIM_DCR_DBL_1      0x0200
+#define  TIM_DCR_DBL_2      0x0400
+#define  TIM_DCR_DBL_3      0x0800
+#define  TIM_DCR_DBL_4      0x1000
+
+#define  TIM_DMAR_DMAB      0xFFFF
+
+struct EXTI
+{
+  volatile uint32_t IMR;
+  volatile uint32_t EMR;
+  volatile uint32_t RTSR;
+  volatile uint32_t FTSR;
+  volatile uint32_t SWIER;
+  volatile uint32_t PR;
+};
+
+#define EXTI_BASE 0x40010400
+static struct EXTI *const EXTI = (struct EXTI *)EXTI_BASE;
+
+#define  EXTI_IMR_MR0       0x00000001
+#define  EXTI_IMR_MR1       0x00000002
+#define  EXTI_IMR_MR2       0x00000004
+#define  EXTI_IMR_MR3       0x00000008
+#define  EXTI_IMR_MR4       0x00000010
+#define  EXTI_IMR_MR5       0x00000020
+#define  EXTI_IMR_MR6       0x00000040
+#define  EXTI_IMR_MR7       0x00000080
+#define  EXTI_IMR_MR8       0x00000100
+#define  EXTI_IMR_MR9       0x00000200
+#define  EXTI_IMR_MR10      0x00000400
+#define  EXTI_IMR_MR11      0x00000800
+#define  EXTI_IMR_MR12      0x00001000
+#define  EXTI_IMR_MR13      0x00002000
+#define  EXTI_IMR_MR14      0x00004000
+#define  EXTI_IMR_MR15      0x00008000
+#define  EXTI_IMR_MR16      0x00010000
+#define  EXTI_IMR_MR17      0x00020000
+#define  EXTI_IMR_MR18      0x00040000
+#define  EXTI_IMR_MR19      0x00080000
+
+#define  EXTI_EMR_MR0       0x00000001
+#define  EXTI_EMR_MR1       0x00000002
+#define  EXTI_EMR_MR2       0x00000004
+#define  EXTI_EMR_MR3       0x00000008
+#define  EXTI_EMR_MR4       0x00000010
+#define  EXTI_EMR_MR5       0x00000020
+#define  EXTI_EMR_MR6       0x00000040
+#define  EXTI_EMR_MR7       0x00000080
+#define  EXTI_EMR_MR8       0x00000100
+#define  EXTI_EMR_MR9       0x00000200
+#define  EXTI_EMR_MR10      0x00000400
+#define  EXTI_EMR_MR11      0x00000800
+#define  EXTI_EMR_MR12      0x00001000
+#define  EXTI_EMR_MR13      0x00002000
+#define  EXTI_EMR_MR14      0x00004000
+#define  EXTI_EMR_MR15      0x00008000
+#define  EXTI_EMR_MR16      0x00010000
+#define  EXTI_EMR_MR17      0x00020000
+#define  EXTI_EMR_MR18      0x00040000
+#define  EXTI_EMR_MR19      0x00080000
+
+#define  EXTI_RTSR_TR0      0x00000001
+#define  EXTI_RTSR_TR1      0x00000002
+#define  EXTI_RTSR_TR2      0x00000004
+#define  EXTI_RTSR_TR3      0x00000008
+#define  EXTI_RTSR_TR4      0x00000010
+#define  EXTI_RTSR_TR5      0x00000020
+#define  EXTI_RTSR_TR6      0x00000040
+#define  EXTI_RTSR_TR7      0x00000080
+#define  EXTI_RTSR_TR8      0x00000100
+#define  EXTI_RTSR_TR9      0x00000200
+#define  EXTI_RTSR_TR10     0x00000400
+#define  EXTI_RTSR_TR11     0x00000800
+#define  EXTI_RTSR_TR12     0x00001000
+#define  EXTI_RTSR_TR13     0x00002000
+#define  EXTI_RTSR_TR14     0x00004000
+#define  EXTI_RTSR_TR15     0x00008000
+#define  EXTI_RTSR_TR16     0x00010000
+#define  EXTI_RTSR_TR17     0x00020000
+#define  EXTI_RTSR_TR18     0x00040000
+#define  EXTI_RTSR_TR19     0x00080000
+
+#define  EXTI_FTSR_TR0      0x00000001
+#define  EXTI_FTSR_TR1      0x00000002
+#define  EXTI_FTSR_TR2      0x00000004
+#define  EXTI_FTSR_TR3      0x00000008
+#define  EXTI_FTSR_TR4      0x00000010
+#define  EXTI_FTSR_TR5      0x00000020
+#define  EXTI_FTSR_TR6      0x00000040
+#define  EXTI_FTSR_TR7      0x00000080
+#define  EXTI_FTSR_TR8      0x00000100
+#define  EXTI_FTSR_TR9      0x00000200
+#define  EXTI_FTSR_TR10     0x00000400
+#define  EXTI_FTSR_TR11     0x00000800
+#define  EXTI_FTSR_TR12     0x00001000
+#define  EXTI_FTSR_TR13     0x00002000
+#define  EXTI_FTSR_TR14     0x00004000
+#define  EXTI_FTSR_TR15     0x00008000
+#define  EXTI_FTSR_TR16     0x00010000
+#define  EXTI_FTSR_TR17     0x00020000
+#define  EXTI_FTSR_TR18     0x00040000
+#define  EXTI_FTSR_TR19     0x00080000
+
+#define  EXTI_SWIER_SWIER0  0x00000001
+#define  EXTI_SWIER_SWIER1  0x00000002
+#define  EXTI_SWIER_SWIER2  0x00000004
+#define  EXTI_SWIER_SWIER3  0x00000008
+#define  EXTI_SWIER_SWIER4  0x00000010
+#define  EXTI_SWIER_SWIER5  0x00000020
+#define  EXTI_SWIER_SWIER6  0x00000040
+#define  EXTI_SWIER_SWIER7  0x00000080
+#define  EXTI_SWIER_SWIER8  0x00000100
+#define  EXTI_SWIER_SWIER9  0x00000200
+#define  EXTI_SWIER_SWIER10 0x00000400
+#define  EXTI_SWIER_SWIER11 0x00000800
+#define  EXTI_SWIER_SWIER12 0x00001000
+#define  EXTI_SWIER_SWIER13 0x00002000
+#define  EXTI_SWIER_SWIER14 0x00004000
+#define  EXTI_SWIER_SWIER15 0x00008000
+#define  EXTI_SWIER_SWIER16 0x00010000
+#define  EXTI_SWIER_SWIER17 0x00020000
+#define  EXTI_SWIER_SWIER18 0x00040000
+#define  EXTI_SWIER_SWIER19 0x00080000
+
+#define  EXTI_PR_PR0        0x00000001
+#define  EXTI_PR_PR1        0x00000002
+#define  EXTI_PR_PR2        0x00000004
+#define  EXTI_PR_PR3        0x00000008
+#define  EXTI_PR_PR4        0x00000010
+#define  EXTI_PR_PR5        0x00000020
+#define  EXTI_PR_PR6        0x00000040
+#define  EXTI_PR_PR7        0x00000080
+#define  EXTI_PR_PR8        0x00000100
+#define  EXTI_PR_PR9        0x00000200
+#define  EXTI_PR_PR10       0x00000400
+#define  EXTI_PR_PR11       0x00000800
+#define  EXTI_PR_PR12       0x00001000
+#define  EXTI_PR_PR13       0x00002000
+#define  EXTI_PR_PR14       0x00004000
+#define  EXTI_PR_PR15       0x00008000
+#define  EXTI_PR_PR16       0x00010000
+#define  EXTI_PR_PR17       0x00020000
+#define  EXTI_PR_PR18       0x00040000
+#define  EXTI_PR_PR19       0x00080000
+
+#define EXTI0_IRQ    6
+#define EXTI1_IRQ    7
+#define EXTI2_IRQ    8
+#define EXTI9_5_IRQ 23
+#define TIM2_IRQ    28
+#define TIM3_IRQ    29
+#define TIM4_IRQ    30
+
+struct AFIO
+{
+  volatile uint32_t EVCR;
+  volatile uint32_t MAPR;
+  volatile uint32_t EXTICR[4];
+  uint32_t RESERVED0;
+  volatile uint32_t MAPR2;
+};
+
+#define AFIO_BASE 0x40010000
+static struct AFIO *const AFIO = (struct AFIO *)AFIO_BASE;
+
+#define AFIO_EXTICR1_EXTI0_PA 0x0000
+#define AFIO_EXTICR1_EXTI0_PB 0x0001
+#define AFIO_EXTICR1_EXTI0_PC 0x0002
+#define AFIO_EXTICR1_EXTI0_PD 0x0003
+
+#define AFIO_EXTICR1_EXTI1_PA 0x0000
+#define AFIO_EXTICR1_EXTI1_PB 0x0010
+#define AFIO_EXTICR1_EXTI1_PC 0x0020
+#define AFIO_EXTICR1_EXTI1_PD 0x0030
+
+#define AFIO_EXTICR1_EXTI2_PA 0x0000
+#define AFIO_EXTICR1_EXTI2_PB 0x0100
+#define AFIO_EXTICR1_EXTI2_PC 0x0200
+#define AFIO_EXTICR1_EXTI2_PD 0x0300
+
+#define AFIO_EXTICR1_EXTI3_PA 0x0000
+#define AFIO_EXTICR1_EXTI3_PB 0x1000
+#define AFIO_EXTICR1_EXTI3_PC 0x2000
+#define AFIO_EXTICR1_EXTI3_PD 0x3000
+
+#define AFIO_EXTICR2_EXTI4_PA 0x0000
+#define AFIO_EXTICR2_EXTI4_PB 0x0001
+#define AFIO_EXTICR2_EXTI4_PC 0x0002
+#define AFIO_EXTICR2_EXTI4_PD 0x0003
+
+#define AFIO_EXTICR2_EXTI5_PA 0x0000
+#define AFIO_EXTICR2_EXTI5_PB 0x0010
+#define AFIO_EXTICR2_EXTI5_PC 0x0020
+#define AFIO_EXTICR2_EXTI5_PD 0x0030
+
+#define AFIO_EXTICR2_EXTI6_PA 0x0000
+#define AFIO_EXTICR2_EXTI6_PB 0x0100
+#define AFIO_EXTICR2_EXTI6_PC 0x0200
+#define AFIO_EXTICR2_EXTI6_PD 0x0300
+
+#define AFIO_EXTICR2_EXTI7_PA 0x0000
+#define AFIO_EXTICR2_EXTI7_PB 0x1000
+#define AFIO_EXTICR2_EXTI7_PC 0x2000
+#define AFIO_EXTICR2_EXTI7_PD 0x3000
+
+#define AFIO_MAPR_TIM3_REMAP_PARTIALREMAP 0x00000800
+#define AFIO_MAPR_SWJ_CFG_DISABLE         0x04000000
--- a/mcu/sys-mkl27z.c
+++ b/mcu/sys-mkl27z.c
@@ -0,0 +1,414 @@
+/*
+ * sys.c - First pages for MKL27Z256.
+ *
+ * Copyright (C) 2016 Flying Stone Technology
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * Copying and distribution of this file, with or without modification,
+ * are permitted in any medium without royalty provided the copyright
+ * notice and this notice are preserved.  This file is offered as-is,
+ * without any warranty.
+ *
+ *
+ * First two pages of Flash ROM is difficult to use because of
+ * predefined purposes.  It's defined as a default vector page and
+ * a flash configuration page.
+ *
+ * We put something useful to those two pages, together with the
+ * data for predefined purposes.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include "board.h"
+
+#define ADDR_VECTORS (0x00000900)
+#define ADDR_SCR_VTOR 0xe000ed08
+
+static void __attribute__ ((naked,section(".fixed_function.reset")))
+reset (void)
+{
+  uint32_t r3 = ADDR_SCR_VTOR;
+
+  asm volatile ("str	%2, [%0]\n\t"	  /* Set SCR->VTOR     */
+		"ldr	%0, [%2]\n\t"     /* Stack address     */
+		"msr	MSP, %0\n\t"	  /* Exception handler stack. */
+		"ldr	%0, [%2, #4]\n\t" /* The entry address */
+		"bx	%0\n\t"           /* Jump to the entry */
+		".align	2"
+		: "=r" (r3)
+		: "0" (r3), "r" (ADDR_VECTORS)
+		: "memory");
+
+  /* Never reach here. */
+}
+
+
+static uint32_t
+stack_entry[] __attribute__ ((section(".first_page.first_words"),used)) = {
+  /* Since MSP are soon modified in RESET, we put 0 here.  */
+  0,
+  (uint32_t)reset,
+};
+
+#include "mcu/clk_gpio_init-mkl27z.c"
+
+static void
+set_led (int on)
+{
+  if (on)
+    GPIOB->PCOR = (1 << 0); /* PTB0: Clear: Light on  */
+  else
+    GPIOB->PSOR = (1 << 0); /* PTB0: Set  : Light off */
+}
+
+/*
+ * Here comes other SYS routines and data.
+ */
+
+const uint8_t sys_version[8] __attribute__((section(".sys.version"))) = {
+  3*2+2,	     /* bLength */
+  0x03,		     /* bDescriptorType = STRING_DESCRIPTOR */
+  /* sys version: "3.0" */
+  '3', 0, '.', 0, '0', 0,
+};
+
+static const uint8_t board_name_string[] = BOARD_NAME;
+
+const uint8_t __attribute__((section(".sys.board_info")))
+*const sys_board_name = board_name_string;
+
+const uint32_t __attribute__((section(".sys.board_info")))
+sys_board_id = BOARD_ID;
+
+typedef void (*handler)(void);
+
+handler sys_vector[] __attribute__ ((section(".sys.vectors"))) = {
+  clock_init,
+  gpio_init,
+  (handler)set_led,
+  NULL,
+};
+
+static uint32_t
+flash_config[] __attribute__ ((section(".flash_config"),used)) = {
+  0xffffffff, 0xffffffff, /* Comparison Key */
+  0xffffffff, /* Protection bytes */
+  0xffff3ffe, /* FSEC=0xfe, FOPT=0x3f */
+  /* FOPT=0x3f:
+   * BOOTSRC_SEL=00: Boot from flash
+   */
+  /* FSEC=0xfe:
+   * unsecure
+   */
+};
+
+
+/*
+ * Flash memory routine
+ */
+struct FTFA {
+  volatile uint8_t FSTAT;
+  volatile uint8_t FCNFG;
+  volatile uint8_t FSEC;
+  volatile uint8_t FOPT;
+  /* Note: addressing (3,2,1,0, 7,6,5,4, B,A,9,8) */
+  /* Use Bx macro. */
+  volatile uint8_t FCCO[12];
+  /* Note: addressing (3,2,1,0).  Use Bx macro.  */
+  volatile uint8_t FPROT[4];
+};
+static struct FTFA *const FTFA = (struct FTFA *)0x40020000;
+
+#define FSTAT_CCIF 0x80
+#define B3 0
+#define B2 1
+#define B1 2
+#define B0 3
+#define B7 4
+#define B6 5
+#define B5 6
+#define B4 7
+#define BB 8
+#define BA 9
+#define B9 10
+#define B8 11
+
+uint32_t __attribute__ ((naked,section(".fixed_function.flash_do_internal")))
+flash_do_internal (void)
+{
+#ifdef ORIGINAL_IN_C
+  uint8_t r;
+
+  asm volatile ("cpsid	i" : : : "memory");
+  FTFA->FSTAT |= FSTAT_CCIF;
+  while (((r = FTFA->FSTAT) & FSTAT_CCIF) == 0)
+    ;
+  r &= ~FSTAT_CCIF;
+  asm volatile ("cpsie	i" : : : "memory");
+
+  return (uint32_t)r;
+#else
+  register unsigned int r0 asm ("r0");
+  register unsigned int r1 asm ("r1") = (unsigned int)FTFA;
+  register unsigned int r2 asm ("r2") = FSTAT_CCIF;
+
+  asm volatile ("cpsid	i\n\t"
+		"ldrb	%0, [%1]\n\t"
+		"orr	%0, %2\n\t"
+		"strb	%0, [%1]\n"
+	"0:\t"
+		"ldrb	%0, [%1]\n\t"
+		"uxtb	%0, %0\n\t"
+		"tst	%0, %2\n\t"
+		"beq	0b\n\t"
+		"cpsie	i\n\t"
+		"bic	%0, %2\n\t"
+		"bx	lr"
+		: "=r" (r0)
+		: "r" (r1), "r" (r2)
+		: "memory");
+  return r0;
+#endif
+}
+
+/*
+ * Let execute flash command.
+ * Since the code should be on RAM, we copy the code onto stack
+ * and let it go.
+ */
+uint32_t __attribute__ ((naked,section(".fixed_function.flash_do")))
+flash_do (void)
+{
+  register unsigned int r0 asm ("r0");
+  register unsigned int r1 asm ("r1");
+  register unsigned int r2 asm ("r2");
+  register unsigned int r3 asm ("r3") = (unsigned int)flash_do_internal&~3;
+  /* Address of Thumb code &1 == 1, so, we clear the last bits.    ------^ */
+
+  asm volatile ("sub	sp, #32\n\t"
+		"mov	%1, sp\n\t"
+		"mov	%2, #0\n"
+	"0:\t"
+		"cmp	%2, #32\n\t"
+		"beq	1f\n\t"
+		"ldr	%0, [%3, %2]\n\t"
+		"str	%0, [%1, %2]\n\t"
+		"add	%2, #4\n\t"
+		"b	0b\n"
+	"1:\t"
+		"add	%1, #1\n\t" /* Thumb code requires LSB=1.  */
+		"mov	%3, lr\n\t"
+		"blx	%1\n\t"
+		"add	sp, #32\n\t"
+		"bx	%3"
+		: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
+		: "3" (r3));
+}
+
+#define FLASH_COMMAND_PROGRAM_LONGWORD   0x06
+#define FLASH_COMMAND_ERASE_FLASH_SECTOR 0x09
+
+int __attribute__ ((naked,section(".fixed_function.flash_erase_page")))
+flash_erase_page (uint32_t addr)
+{
+#ifdef ORIGINAL_IN_C
+  FTFA->FCCO[B0] = FLASH_COMMAND_ERASE_FLASH_SECTOR;
+  FTFA->FCCO[B3] = (addr >>  0) & 0xff;
+  FTFA->FCCO[B2] = (addr >>  8) & 0xff;
+  FTFA->FCCO[B1] = (addr >> 16) & 0xff;
+  flash_do ();
+#else
+  register unsigned int r0 asm ("r0") = addr;
+  register unsigned int r1 asm ("r1");
+  register unsigned int r2 asm ("r2") = FLASH_COMMAND_ERASE_FLASH_SECTOR;
+  register unsigned int r3 asm ("r3") = (unsigned int)FTFA;
+
+  asm volatile ("strb	%2, [%3, #7]\n\t"
+		"strb	%0, [%3, #4]\n\t"
+		"lsr	%0, #8\n\t"
+		"strb	%0, [%3, #5]\n\t"
+		"lsr	%0, #8\n\t"
+		"strb	%0, [%3, #6]\n\t"
+		"b	flash_do"
+		: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
+		: "0" (r0), "2" (r2), "3" (r3));
+#endif
+}
+
+int __attribute__ ((naked,section(".fixed_function.flash_program_word")))
+flash_program_word (uint32_t addr, uint32_t word)
+{
+#ifdef ORIGINAL_IN_C
+  FTFA->FCCO[B0] = FLASH_COMMAND_PROGRAM_LONGWORD;
+  FTFA->FCCO[B3] = (addr >>  0) & 0xff;
+  FTFA->FCCO[B2] = (addr >>  8) & 0xff;
+  FTFA->FCCO[B1] = (addr >> 16) & 0xff;
+  FTFA->FCCO[B4] = (word >>  0) & 0xff;
+  FTFA->FCCO[B5] = (word >>  8) & 0xff;
+  FTFA->FCCO[B6] = (word >> 16) & 0xff;
+  FTFA->FCCO[B7] = (word >> 24) & 0xff;
+  flash_do ();
+#else
+  register unsigned int r0 asm ("r0") = addr;
+  register unsigned int r1 asm ("r1") = word;
+  register unsigned int r2 asm ("r2") = FLASH_COMMAND_PROGRAM_LONGWORD;
+  register unsigned int r3 asm ("r3") = (unsigned int)FTFA;
+
+  asm volatile ("strb	%2, [%3, #7]\n\t"
+		"strb	%0, [%3, #4]\n\t"
+		"lsr	%0, #8\n\t"
+		"strb	%0, [%3, #5]\n\t"
+		"lsr	%0, #8\n\t"
+		"strb	%0, [%3, #6]\n\t"
+		"strb	%1, [%3, #11]\n\t"
+		"lsr	%1, #8\n\t"
+		"strb	%1, [%3, #10]\n\t"
+		"lsr	%1, #8\n\t"
+		"strb	%1, [%3, #9]\n\t"
+		"lsr	%1, #8\n\t"
+		"strb	%1, [%3, #8]\n\t"
+		"b	flash_do"
+		: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
+		: "0" (r0), "1" (r1), "2" (r2), "3" (r3));
+#endif
+}
+
+
+/*
+ * CRC32 calculation routines.
+ */
+void __attribute__ ((naked,section(".fixed_function.crc32_init")))
+crc32_init  (unsigned int *p)
+{
+#ifdef ORIGINAL_IN_C
+  *p = 0xffffffff;
+#else
+  register unsigned int r3 asm ("r3");
+
+  asm volatile ("mov	%0, #1\n\t"
+		"neg	%0, %0\n\t"
+		"str	%0, [%1]\n\t"
+		"bx	lr"
+		: "=r" (r3)
+		: "r" (p)
+		: "memory");
+#endif
+}
+
+#ifdef ORIGINAL_IN_C
+const unsigned int *const crc32_table= (const unsigned int *)0x00000500;
+#endif
+
+void __attribute__ ((naked,section(".fixed_function.crc32_u8")))
+crc32_u8 (unsigned int *p, unsigned char v)
+{
+#ifdef ORIGINAL_IN_C
+  *p = crc32_table[(*p & 0xff) ^ v] ^ (*p >> 8);
+#else
+  register unsigned int r2 asm ("r2");
+  register unsigned int r3 asm ("r3");
+
+  asm volatile ("ldrb	%2, [%4]\n\t"
+		"eor	%0, %2\n\t"
+		"mov	%2, #0xa0\n\t" /* (0x0500 >> 3) */
+		"lsl	%0, %0, #2\n\t"
+		"lsl	%2, %2, #3\n\t"
+		"add	%0, %0, %2\n\t"
+		"ldr	%2, [%4]\n\t"
+		"ldr	%1, [%0]\n\t"
+		"lsr	%2, %2, #8\n\t"
+		"eor	%2, %1\n\t"
+		"str	%2, [%4]\n\t"
+		"bx	lr"
+		: "=r" (v), "=r" (r2), "=r" (r3)
+		: "0" (v), "r" (p)
+		: "memory");
+#endif
+}
+
+void __attribute__ ((naked,section(".fixed_function.crc32_u32")))
+crc32_u32 (unsigned int *p, unsigned int u)
+{
+#ifdef ORIGINAL_IN_C
+  crc32_u8 (p, u & 0xff);
+  crc32_u8 (p, (u >> 8)& 0xff);
+  crc32_u8 (p, (u >> 16)& 0xff);
+  crc32_u8 (p, (u >> 24)& 0xff);
+#else
+  register unsigned int r3 asm ("r3");
+  register unsigned int r4 asm ("r4");
+  register unsigned int r5 asm ("r5");
+
+  asm volatile ("push	{%1, %2, %3, lr}\n\t"
+		"mov	%2, %0\n\t"
+		"mov	%3, %5\n\t"
+		"uxtb	%0, %0\n\t"
+		"bl	crc32_u8\n\t"
+		"lsr	%0, %2, #8\n\t"
+		"mov	%5, %3\n\t"
+		"uxtb	%0, %0\n\t"
+		"bl	crc32_u8\n\t"
+		"lsr	%0, %2, #16\n\t"
+		"mov	%5, %3\n\t"
+		"uxtb	%0, %0\n\t"
+		"bl	crc32_u8\n\t"
+		"mov	%5, %3\n\t"
+		"lsr	%0, %2, #24\n\t"
+		"bl	crc32_u8\n\t"
+		"pop	{%1, %2, %3, pc}"
+		: "=r" (u), "=r" (r3), "=r" (r4), "=r" (r5)
+		: "0" (u), "r" (p)
+		: "memory");
+#endif
+}
+
+/*
+ * Table of CRC32, generated by gen_crc_table.py
+ */
+const unsigned int
+crc32_table[256] __attribute__ ((section(".crc32_table"))) = {
+  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 
+  0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 
+  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 
+  0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 
+  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 
+  0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 
+  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 
+  0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 
+  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 
+  0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 
+  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 
+  0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 
+  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 
+  0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 
+  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 
+  0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 
+  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 
+  0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 
+  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 
+  0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 
+  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 
+  0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 
+  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 
+  0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 
+  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 
+  0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 
+  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 
+  0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 
+  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 
+  0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 
+  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 
+  0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 
+  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 
+  0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 
+  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 
+  0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 
+  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 
+  0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 
+  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 
+  0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 
+  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 
+  0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 
+  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+};
--- a/mcu/sys-mkl27z.h
+++ b/mcu/sys-mkl27z.h
@@ -0,0 +1,39 @@
+extern const uint8_t sys_version[8];
+#if defined(USE_SYS3) || defined(USE_SYS_BOARD_ID)
+extern const uint32_t sys_board_id;
+extern const char *const sys_board_name;
+#endif
+
+typedef void (*handler)(void);
+extern handler sys_vector[16];
+
+static inline void
+set_led (int on)
+{
+  void (*func) (int) = (void (*)(int))sys_vector[2];
+
+  return (*func) (on);
+}
+
+void crc32_init (unsigned int *);
+void crc32_u8 (unsigned int *, unsigned char);
+void crc32_u32 (unsigned int *, unsigned int);
+
+int flash_erase_page (uint32_t addr);
+int flash_program_word (uint32_t addr, uint32_t word);
+
+#ifdef REQUIRE_CLOCK_GPIO_SETTING_IN_SYS
+/* Provide the function entries.  */
+
+static void __attribute__ ((used))
+clock_init (void)
+{
+  (*sys_vector[0]) ();
+}
+
+static void __attribute__ ((used))
+gpio_init (void)
+{
+  (*sys_vector[1]) ();
+}
+#endif
--- a/mcu/sys-stm32f0.c
+++ b/mcu/sys-stm32f0.c
@@ -1,7 +1,7 @@
 /*
 * sys.c - system routines for the initial page for STM32F030 / STM32F103.
 *
- * Copyright (C) 2013, 2014, 2015 Flying Stone Technology
+ * Copyright (C) 2013, 2014, 2015, 2016 Flying Stone Technology
 * Author: NIIBE Yutaka <gniibe@fsij.org>
 *
 * Copying and distribution of this file, with or without modification,
@@ -17,41 +17,9 @@
 #include <stdlib.h>
 #include "board.h"

-#include "clk_gpio_init.c"
+#define STM32F0_USE_VECTOR_ON_RAM
+#include "mcu/clk_gpio_init-stm32.c"

-#define CORTEX_PRIORITY_BITS    4
-#define CORTEX_PRIORITY_MASK(n)  ((n) << (8 - CORTEX_PRIORITY_BITS))
-#define USB_LP_CAN1_RX0_IRQn	 20
-#define STM32_USB_IRQ_PRIORITY   11
-
-struct NVIC {
-  uint32_t ISER[8];
-  uint32_t unused1[24];
-  uint32_t ICER[8];
-  uint32_t unused2[24];
-  uint32_t ISPR[8];
-  uint32_t unused3[24];
-  uint32_t ICPR[8];
-  uint32_t unused4[24];
-  uint32_t IABR[8];
-  uint32_t unused5[56];
-  uint32_t IPR[60];
-};
-
-static struct NVIC *const NVICBase = ((struct NVIC *const)0xE000E100);
-#define NVIC_ISER(n)	(NVICBase->ISER[n >> 5])
-#define NVIC_ICPR(n)	(NVICBase->ICPR[n >> 5])
-#define NVIC_IPR(n)	(NVICBase->IPR[n >> 2])
-
-static void
-nvic_enable_vector (uint32_t n, uint32_t prio)
-{
-  unsigned int sh = (n & 3) << 3;
-
-  NVIC_IPR (n) = (NVIC_IPR(n) & ~(0xFF << sh)) | (prio << sh);
-  NVIC_ICPR (n) = 1 << (n & 0x1F);
-  NVIC_ISER (n) = 1 << (n & 0x1F);
-}

 static void
 usb_cable_config (int enable)
@@ -118,13 +86,6 @@ usb_lld_sys_init (void)

  usb_cable_config (1);
  RCC->APB1ENR |= RCC_APB1ENR_USBEN;
-  nvic_enable_vector (USB_LP_CAN1_RX0_IRQn,
-		      CORTEX_PRIORITY_MASK (STM32_USB_IRQ_PRIORITY));
-  /*
-   * Note that we also have other IRQ(s):
-   * 	USB_HP_CAN1_TX_IRQn (for double-buffered or isochronous)
-   * 	USBWakeUp_IRQn (suspend/resume)
-   */
  RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
  RCC->APB1RSTR = 0;
 }
@@ -362,7 +323,7 @@ struct SCB

 #define SCS_BASE	(0xE000E000)
 #define SCB_BASE	(SCS_BASE +  0x0D00)
-static struct SCB *const SCB = ((struct SCB *const) SCB_BASE);
+static struct SCB *const SCB = (struct SCB *)SCB_BASE;

 #define SYSRESETREQ 0x04
 static void
@@ -402,7 +363,7 @@ reset (void)
 	"1:	.word	0x20000000"
 		: /* no output */ : /* no input */ : "memory");
 #else
-  extern const unsigned long *FT0, *FT1, *FT2;
+  extern const uint32_t FT0[256], FT1[256], FT2[256];
  asm volatile ("cpsid	i\n\t"		/* Mask all interrupts. */
 		"ldr	r0, 1f\n\t"     /* r0 = SCR */
 		"mov	r1, pc\n\t"	/* r1 = (PC + 0x1000) & ~0x0fff */
@@ -450,8 +411,8 @@ handler vector[] __attribute__ ((section(".vectors"))) = {
 const uint8_t sys_version[8] __attribute__((section(".sys.version"))) = {
  3*2+2,	     /* bLength */
  0x03,		     /* bDescriptorType = USB_STRING_DESCRIPTOR_TYPE */
-  /* sys version: "2.1" */
-  '2', 0, '.', 0, '1', 0,
+  /* sys version: "3.0" */
+  '3', 0, '.', 0, '0', 0,
 };

 const uint32_t __attribute__((section(".sys.board_id")))
--- a/mcu/sys-stm32f0.h
+++ b/mcu/sys-stm32f0.h
@@ -16,8 +16,12 @@
 #endif

 extern const uint8_t sys_version[8];
+#if defined(USE_SYS3) || defined(USE_SYS_BOARD_ID)
 extern const uint32_t sys_board_id;
 extern const uint8_t sys_board_name[];
+#else
+# define SYS_BOARD_ID BOARD_ID
+#endif

 typedef void (*handler)(void);
 extern handler vector[16];
@@ -113,22 +117,18 @@ nvic_system_reset (void)
  (*vector[12]) ();
 }

-/*
- * Users can override INLINE by 'attribute((used))' to have an
- * implementation defined.
- */
-#if !defined(INLINE)
-#define INLINE __inline__
-#endif
+#ifdef REQUIRE_CLOCK_GPIO_SETTING_IN_SYS
+/* Provide the function entries.  */

-static INLINE void
+static void __attribute__ ((used))
 clock_init (void)
 {
  (*vector[13]) ();
 }

-static INLINE void
+static void __attribute__ ((used))
 gpio_init (void)
 {
  (*vector[14]) ();
 }
+#endif
--- a/mcu/sys-stm32f103.c
+++ b/mcu/sys-stm32f103.c
@@ -1,7 +1,7 @@
 /*
 * sys.c - system routines for the initial page for STM32F103.
 *
- * Copyright (C) 2013, 2014, 2015 Flying Stone Technology
+ * Copyright (C) 2013, 2014, 2015, 2016  Flying Stone Technology
 * Author: NIIBE Yutaka <gniibe@fsij.org>
 *
 * Copying and distribution of this file, with or without modification,
@@ -17,41 +17,8 @@
 #include <stdlib.h>
 #include "board.h"

-#include "clk_gpio_init.c"
+#include "mcu/clk_gpio_init-stm32.c"

-#define CORTEX_PRIORITY_BITS    4
-#define CORTEX_PRIORITY_MASK(n)  ((n) << (8 - CORTEX_PRIORITY_BITS))
-#define USB_LP_CAN1_RX0_IRQn	 20
-#define STM32_USB_IRQ_PRIORITY   11
-
-struct NVIC {
-  uint32_t ISER[8];
-  uint32_t unused1[24];
-  uint32_t ICER[8];
-  uint32_t unused2[24];
-  uint32_t ISPR[8];
-  uint32_t unused3[24];
-  uint32_t ICPR[8];
-  uint32_t unused4[24];
-  uint32_t IABR[8];
-  uint32_t unused5[56];
-  uint32_t IPR[60];
-};
-
-static struct NVIC *const NVICBase = ((struct NVIC *const)0xE000E100);
-#define NVIC_ISER(n)	(NVICBase->ISER[n >> 5])
-#define NVIC_ICPR(n)	(NVICBase->ICPR[n >> 5])
-#define NVIC_IPR(n)	(NVICBase->IPR[n >> 2])
-
-static void
-nvic_enable_vector (uint32_t n, uint32_t prio)
-{
-  unsigned int sh = (n & 3) << 3;
-
-  NVIC_IPR (n) = (NVIC_IPR(n) & ~(0xFF << sh)) | (prio << sh);
-  NVIC_ICPR (n) = 1 << (n & 0x1F);
-  NVIC_ISER (n) = 1 << (n & 0x1F);
-}

 static void
 usb_cable_config (int enable)
@@ -118,13 +85,6 @@ usb_lld_sys_init (void)

  usb_cable_config (1);
  RCC->APB1ENR |= RCC_APB1ENR_USBEN;
-  nvic_enable_vector (USB_LP_CAN1_RX0_IRQn,
-		      CORTEX_PRIORITY_MASK (STM32_USB_IRQ_PRIORITY));
-  /*
-   * Note that we also have other IRQ(s):
-   * 	USB_HP_CAN1_TX_IRQn (for double-buffered or isochronous)
-   * 	USBWakeUp_IRQn (suspend/resume)
-   */
  RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
  RCC->APB1RSTR = 0;
 }
@@ -253,7 +213,11 @@ static int
 flash_write (uint32_t dst_addr, const uint8_t *src, size_t len)
 {
  int status;
+#if defined(STM32F103_OVERRIDE_FLASH_SIZE_KB)
+  uint32_t flash_end = FLASH_START_ADDR + STM32F103_OVERRIDE_FLASH_SIZE_KB*1024;
+#else
  uint32_t flash_end = FLASH_START_ADDR + (*FLASH_SIZE_REG)*1024;
+#endif

  if (dst_addr < FLASH_START || dst_addr + len > flash_end)
    return 0;
@@ -309,7 +273,11 @@ static void __attribute__((naked))
 flash_erase_all_and_exec (void (*entry)(void))
 {
  uint32_t addr = FLASH_START;
+#if defined(STM32F103_OVERRIDE_FLASH_SIZE_KB)
+  uint32_t end = FLASH_START_ADDR + STM32F103_OVERRIDE_FLASH_SIZE_KB*1024;
+#else
  uint32_t end = FLASH_START_ADDR + (*FLASH_SIZE_REG)*1024;
+#endif
  uint32_t page_size = 1024;
  int r;

@@ -356,7 +324,7 @@ struct SCB

 #define SCS_BASE	(0xE000E000)
 #define SCB_BASE	(SCS_BASE +  0x0D00)
-static struct SCB *const SCB = ((struct SCB *const) SCB_BASE);
+static struct SCB *const SCB = (struct SCB *)SCB_BASE;

 #define SYSRESETREQ 0x04
 static void
@@ -370,7 +338,7 @@ nvic_system_reset (void)
 static void __attribute__ ((naked))
 reset (void)
 {
-  extern const unsigned long *FT0, *FT1, *FT2;
+  extern const uint32_t FT0[256], FT1[256], FT2[256];

  /*
   * This code may not be at the start of flash ROM, because of DFU.
@@ -423,8 +391,8 @@ handler vector[] __attribute__ ((section(".vectors"))) = {
 const uint8_t sys_version[8] __attribute__((section(".sys.version"))) = {
  3*2+2,	     /* bLength */
  0x03,		     /* bDescriptorType = USB_STRING_DESCRIPTOR_TYPE */
-  /* sys version: "2.1" */
-  '2', 0, '.', 0, '1', 0,
+  /* sys version: "3.0" */
+  '3', 0, '.', 0, '0', 0,
 };

 const uint32_t __attribute__((section(".sys.board_id")))
@@ -432,3 +400,149 @@ sys_board_id = BOARD_ID;

 const uint8_t __attribute__((section(".sys.board_name")))
 sys_board_name[] = BOARD_NAME;
+
+/*
+ * aes-constant-ft.c - AES forward tables.
+ *
+ * We need something useful for the initial flash ROM page (4 Ki
+ * bytes), which cannot be modified after installation.  Even after
+ * upgrade of the firmware, it stays intact.
+ *
+ * We decide to put 3/4 of AES forward tables to fill 3 Ki bytes, as
+ * its useful and it won't change.
+ *
+ * The code was taken from aes.c of PolarSSL version 0.14, and then,
+ * modified to add section names.
+ *
+ * Since this is just a data, it wouldn't be copyright-able, but the
+ * original auther would claim so.  Thus, we put original copyright
+ * notice here.  It is highly likely that there will be no such a
+ * thing for copyright.  Nevertheless, we think that PolarSSL is good
+ * software to address here, and encourage people using it.
+ *
+ */
+
+#include <stdint.h>
+
+/*
+ * Original copyright notice is below:
+ */
+
+/*
+ *  FIPS-197 compliant AES implementation
+ *
+ *  Copyright (C) 2006-2010, Brainspark B.V.
+ *
+ *  This file is part of PolarSSL (http://www.polarssl.org)
+ *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ *  All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+/*
+ *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
+ *
+ *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
+ *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
+ */
+
+/*
+ * Forward tables
+ */
+#define FT \
+\
+    V(A5,63,63,C6), V(84,7C,7C,F8), V(99,77,77,EE), V(8D,7B,7B,F6), \
+    V(0D,F2,F2,FF), V(BD,6B,6B,D6), V(B1,6F,6F,DE), V(54,C5,C5,91), \
+    V(50,30,30,60), V(03,01,01,02), V(A9,67,67,CE), V(7D,2B,2B,56), \
+    V(19,FE,FE,E7), V(62,D7,D7,B5), V(E6,AB,AB,4D), V(9A,76,76,EC), \
+    V(45,CA,CA,8F), V(9D,82,82,1F), V(40,C9,C9,89), V(87,7D,7D,FA), \
+    V(15,FA,FA,EF), V(EB,59,59,B2), V(C9,47,47,8E), V(0B,F0,F0,FB), \
+    V(EC,AD,AD,41), V(67,D4,D4,B3), V(FD,A2,A2,5F), V(EA,AF,AF,45), \
+    V(BF,9C,9C,23), V(F7,A4,A4,53), V(96,72,72,E4), V(5B,C0,C0,9B), \
+    V(C2,B7,B7,75), V(1C,FD,FD,E1), V(AE,93,93,3D), V(6A,26,26,4C), \
+    V(5A,36,36,6C), V(41,3F,3F,7E), V(02,F7,F7,F5), V(4F,CC,CC,83), \
+    V(5C,34,34,68), V(F4,A5,A5,51), V(34,E5,E5,D1), V(08,F1,F1,F9), \
+    V(93,71,71,E2), V(73,D8,D8,AB), V(53,31,31,62), V(3F,15,15,2A), \
+    V(0C,04,04,08), V(52,C7,C7,95), V(65,23,23,46), V(5E,C3,C3,9D), \
+    V(28,18,18,30), V(A1,96,96,37), V(0F,05,05,0A), V(B5,9A,9A,2F), \
+    V(09,07,07,0E), V(36,12,12,24), V(9B,80,80,1B), V(3D,E2,E2,DF), \
+    V(26,EB,EB,CD), V(69,27,27,4E), V(CD,B2,B2,7F), V(9F,75,75,EA), \
+    V(1B,09,09,12), V(9E,83,83,1D), V(74,2C,2C,58), V(2E,1A,1A,34), \
+    V(2D,1B,1B,36), V(B2,6E,6E,DC), V(EE,5A,5A,B4), V(FB,A0,A0,5B), \
+    V(F6,52,52,A4), V(4D,3B,3B,76), V(61,D6,D6,B7), V(CE,B3,B3,7D), \
+    V(7B,29,29,52), V(3E,E3,E3,DD), V(71,2F,2F,5E), V(97,84,84,13), \
+    V(F5,53,53,A6), V(68,D1,D1,B9), V(00,00,00,00), V(2C,ED,ED,C1), \
+    V(60,20,20,40), V(1F,FC,FC,E3), V(C8,B1,B1,79), V(ED,5B,5B,B6), \
+    V(BE,6A,6A,D4), V(46,CB,CB,8D), V(D9,BE,BE,67), V(4B,39,39,72), \
+    V(DE,4A,4A,94), V(D4,4C,4C,98), V(E8,58,58,B0), V(4A,CF,CF,85), \
+    V(6B,D0,D0,BB), V(2A,EF,EF,C5), V(E5,AA,AA,4F), V(16,FB,FB,ED), \
+    V(C5,43,43,86), V(D7,4D,4D,9A), V(55,33,33,66), V(94,85,85,11), \
+    V(CF,45,45,8A), V(10,F9,F9,E9), V(06,02,02,04), V(81,7F,7F,FE), \
+    V(F0,50,50,A0), V(44,3C,3C,78), V(BA,9F,9F,25), V(E3,A8,A8,4B), \
+    V(F3,51,51,A2), V(FE,A3,A3,5D), V(C0,40,40,80), V(8A,8F,8F,05), \
+    V(AD,92,92,3F), V(BC,9D,9D,21), V(48,38,38,70), V(04,F5,F5,F1), \
+    V(DF,BC,BC,63), V(C1,B6,B6,77), V(75,DA,DA,AF), V(63,21,21,42), \
+    V(30,10,10,20), V(1A,FF,FF,E5), V(0E,F3,F3,FD), V(6D,D2,D2,BF), \
+    V(4C,CD,CD,81), V(14,0C,0C,18), V(35,13,13,26), V(2F,EC,EC,C3), \
+    V(E1,5F,5F,BE), V(A2,97,97,35), V(CC,44,44,88), V(39,17,17,2E), \
+    V(57,C4,C4,93), V(F2,A7,A7,55), V(82,7E,7E,FC), V(47,3D,3D,7A), \
+    V(AC,64,64,C8), V(E7,5D,5D,BA), V(2B,19,19,32), V(95,73,73,E6), \
+    V(A0,60,60,C0), V(98,81,81,19), V(D1,4F,4F,9E), V(7F,DC,DC,A3), \
+    V(66,22,22,44), V(7E,2A,2A,54), V(AB,90,90,3B), V(83,88,88,0B), \
+    V(CA,46,46,8C), V(29,EE,EE,C7), V(D3,B8,B8,6B), V(3C,14,14,28), \
+    V(79,DE,DE,A7), V(E2,5E,5E,BC), V(1D,0B,0B,16), V(76,DB,DB,AD), \
+    V(3B,E0,E0,DB), V(56,32,32,64), V(4E,3A,3A,74), V(1E,0A,0A,14), \
+    V(DB,49,49,92), V(0A,06,06,0C), V(6C,24,24,48), V(E4,5C,5C,B8), \
+    V(5D,C2,C2,9F), V(6E,D3,D3,BD), V(EF,AC,AC,43), V(A6,62,62,C4), \
+    V(A8,91,91,39), V(A4,95,95,31), V(37,E4,E4,D3), V(8B,79,79,F2), \
+    V(32,E7,E7,D5), V(43,C8,C8,8B), V(59,37,37,6E), V(B7,6D,6D,DA), \
+    V(8C,8D,8D,01), V(64,D5,D5,B1), V(D2,4E,4E,9C), V(E0,A9,A9,49), \
+    V(B4,6C,6C,D8), V(FA,56,56,AC), V(07,F4,F4,F3), V(25,EA,EA,CF), \
+    V(AF,65,65,CA), V(8E,7A,7A,F4), V(E9,AE,AE,47), V(18,08,08,10), \
+    V(D5,BA,BA,6F), V(88,78,78,F0), V(6F,25,25,4A), V(72,2E,2E,5C), \
+    V(24,1C,1C,38), V(F1,A6,A6,57), V(C7,B4,B4,73), V(51,C6,C6,97), \
+    V(23,E8,E8,CB), V(7C,DD,DD,A1), V(9C,74,74,E8), V(21,1F,1F,3E), \
+    V(DD,4B,4B,96), V(DC,BD,BD,61), V(86,8B,8B,0D), V(85,8A,8A,0F), \
+    V(90,70,70,E0), V(42,3E,3E,7C), V(C4,B5,B5,71), V(AA,66,66,CC), \
+    V(D8,48,48,90), V(05,03,03,06), V(01,F6,F6,F7), V(12,0E,0E,1C), \
+    V(A3,61,61,C2), V(5F,35,35,6A), V(F9,57,57,AE), V(D0,B9,B9,69), \
+    V(91,86,86,17), V(58,C1,C1,99), V(27,1D,1D,3A), V(B9,9E,9E,27), \
+    V(38,E1,E1,D9), V(13,F8,F8,EB), V(B3,98,98,2B), V(33,11,11,22), \
+    V(BB,69,69,D2), V(70,D9,D9,A9), V(89,8E,8E,07), V(A7,94,94,33), \
+    V(B6,9B,9B,2D), V(22,1E,1E,3C), V(92,87,87,15), V(20,E9,E9,C9), \
+    V(49,CE,CE,87), V(FF,55,55,AA), V(78,28,28,50), V(7A,DF,DF,A5), \
+    V(8F,8C,8C,03), V(F8,A1,A1,59), V(80,89,89,09), V(17,0D,0D,1A), \
+    V(DA,BF,BF,65), V(31,E6,E6,D7), V(C6,42,42,84), V(B8,68,68,D0), \
+    V(C3,41,41,82), V(B0,99,99,29), V(77,2D,2D,5A), V(11,0F,0F,1E), \
+    V(CB,B0,B0,7B), V(FC,54,54,A8), V(D6,BB,BB,6D), V(3A,16,16,2C)
+
+#define V(a,b,c,d) 0x##a##b##c##d
+const uint32_t FT0[256] __attribute__((section(".sys.0"))) = { FT };
+#undef V
+
+#define V(a,b,c,d) 0x##b##c##d##a
+const uint32_t FT1[256] __attribute__((section(".sys.1"))) = { FT };
+#undef V
+
+#define V(a,b,c,d) 0x##c##d##a##b
+const uint32_t FT2[256] __attribute__((section(".sys.2"))) = { FT };
+#undef V
+
+#ifdef ORIGINAL_IMPLEMENTATION 
+#define V(a,b,c,d) 0x##d##a##b##c
+const uint32_t FT3[256] = { FT };
+#undef V
+#endif
--- a/mcu/sys-stm32f103.h
+++ b/mcu/sys-stm32f103.h
@@ -12,8 +12,13 @@
 #define BOARD_ID_NITROKEY_START    0xad1e7ebd

 extern const uint8_t sys_version[8];
+#if defined(USE_SYS3) || defined(USE_SYS_BOARD_ID)
 extern const uint32_t sys_board_id;
 extern const uint8_t sys_board_name[];
+# define SYS_BOARD_ID sys_board_id
+#else
+# define SYS_BOARD_ID BOARD_ID
+#endif

 typedef void (*handler)(void);
 extern handler vector[16];
@@ -109,22 +114,18 @@ nvic_system_reset (void)
  (*vector[12]) ();
 }

-/*
- * Users can override INLINE by 'attribute((used))' to have an
- * implementation defined.
- */
-#if !defined(INLINE)
-#define INLINE __inline__
-#endif
+#ifdef REQUIRE_CLOCK_GPIO_SETTING_IN_SYS
+/* Provide the function entries.  */

-static INLINE void
+static void __attribute__ ((used))
 clock_init (void)
 {
  (*vector[13]) ();
 }

-static INLINE void
+static void __attribute__ ((used))
 gpio_init (void)
 {
  (*vector[14]) ();
 }
+#endif
--- a/mcu/usb-mkl27z.c
+++ b/mcu/usb-mkl27z.c
@@ -0,0 +1,993 @@
+/*
+ * usb-mkl27z.c - USB driver for MKL27Z
+ *
+ * Copyright (C) 2016  Flying Stone Technology
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "usb_lld.h"
+
+#define DATA0 0
+#define DATA1 1
+
+struct endpoint_ctl {
+  uint32_t rx_odd: 1;
+  uint32_t tx_odd: 1;
+};
+static struct endpoint_ctl ep[16];
+
+struct USB_CONF {
+  const uint8_t PERID;       /* Peripheral ID register              */
+  uint8_t rsvd0[3];          /*                                     */
+  const uint8_t IDCOMP;      /* Peripheral ID Complement register   */
+  uint8_t rsvd1[3];          /*                                     */
+  const uint8_t REV;         /* Peripheral Revision register        */
+  uint8_t rsvd2[3];          /*                                     */
+  volatile uint8_t ADDINFO;  /* Peripheral Additional Info register */
+};
+static struct USB_CONF *const USB_CONF = (struct USB_CONF *)0x40072000;
+
+struct USB_CTRL0 {
+  volatile uint8_t OTGCTL;   /* OTG Control register                */
+};
+static struct USB_CTRL0 *const USB_CTRL0 = (struct USB_CTRL0 *)0x4007201c;
+
+struct USB_CTRL1 {
+  volatile uint8_t ISTAT;    /* Interrupt Status register           */
+  uint8_t rsvd5[3];          /*                                     */
+  volatile uint8_t INTEN;    /* Interrupt Enable register           */
+  uint8_t rsvd6[3];          /*                                     */
+  volatile uint8_t ERRSTAT;  /* Error Interrupt Status register     */
+  uint8_t rsvd7[3];          /*                                     */
+  volatile uint8_t ERREN;    /* Error Interrupt Enable register     */
+  uint8_t rsvd8[3];          /*                                     */
+  volatile uint8_t STAT;     /* Status register                     */
+  uint8_t rsvd9[3];          /*                                     */
+  volatile uint8_t CTL;      /* Control register                    */
+  uint8_t rsvd10[3];         /*                                     */
+  volatile uint8_t ADDR;     /* Address register                    */
+  uint8_t rsvd11[3];         /*                                     */
+  volatile uint8_t BDTPAGE1; /* BDT Page register 1                 */
+  uint8_t rsvd12[3];         /*                                     */
+  volatile uint8_t FRMNUML;  /* Frame Number register Low           */
+  uint8_t rsvd13[3];         /*                                     */
+  volatile uint8_t FRMNUMH;  /* Frame Number register High          */
+  uint8_t rsvd14[11];        /*                                     */
+  volatile uint8_t BDTPAGE2; /* BDT Page Register 2                 */
+  uint8_t rsvd15[3];         /*                                     */
+  volatile uint8_t BDTPAGE3; /* BDT Page Register 3                 */
+};
+static struct USB_CTRL1 *const USB_CTRL1 = (struct USB_CTRL1 *)0x40072080;
+
+/* Interrupt source bits */
+#define USB_IS_STALL  (1 << 7)
+#define USB_IS_RESUME (1 << 5)
+#define USB_IS_SLEEP  (1 << 4)
+#define USB_IS_TOKDNE (1 << 3)
+#define USB_IS_SOFTOK (1 << 2)
+#define USB_IS_ERROR  (1 << 1)
+#define USB_IS_USBRST (1 << 0)
+
+
+struct USB_ENDPT {
+  volatile uint8_t EP;  /* Endpoint Control register */
+  uint8_t rsvd17[3];
+};
+static struct USB_ENDPT *const USB_ENDPT = (struct USB_ENDPT *)0x400720c0;
+
+struct USB_CTRL2 {
+  volatile uint8_t USBCTRL;  /* USB Control register                */
+  uint8_t rsvd33[3];         /*                                     */
+  volatile uint8_t OBSERVE;  /* USB OTG Observe register            */
+  uint8_t rsvd34[3];         /*                                     */
+  volatile uint8_t CONTROL;  /* USB OTG Control register            */
+  uint8_t rsvd35[3];         /*                                     */
+  volatile uint8_t USBTRC0;  /* USB Transceiver Control register 0  */
+  uint8_t rsvd36[7];         /*                                     */
+  volatile uint8_t USBFRMADJUST;           /* Frame Adjut Register  */
+};
+static struct USB_CTRL2 *const USB_CTRL2 = (struct USB_CTRL2 *)0x40072100;
+
+/* Buffer Descriptor */
+struct BD {
+  volatile uint32_t ctrl;
+  volatile void *buf; 
+};
+/*
+  uint32_t rsvd0 : 2;
+  volatile uint32_t STALL: 1;
+  volatile uint32_t DTS: 1;
+
+  volatile uint32_t NINC: 1;
+  volatile uint32_t KEEP: 1;
+  volatile uint32_t DATA01: 1;
+  volatile uint32_t OWN: 1;
+
+  uint32_t rsvd1: 8;
+  volatile uint32_t BC: 10;
+  uint32_t rsvd2: 6;
+*/
+#define TOK_PID(ctrl)   ((ctrl >> 2) & 0x0f)
+
+extern uint8_t __usb_bdt__;
+
+static struct BD *const BD_table = (struct BD *)&__usb_bdt__;
+
+static void
+kl27z_usb_init (void)
+{
+  int i;
+
+  memset (ep, 0, sizeof (ep));
+  memset (BD_table, 0, 16 * 2 * 2 * sizeof (struct BD));
+
+  /* D+ pull up */
+  USB_CTRL0->OTGCTL = 0x80;
+
+  USB_CTRL1->ERREN = 0xff;
+
+  USB_CTRL1->BDTPAGE1 = ((uint32_t)BD_table) >> 8;
+  USB_CTRL1->BDTPAGE2 = ((uint32_t)BD_table) >> 16;
+  USB_CTRL1->BDTPAGE3 = ((uint32_t)BD_table) >> 24;
+
+  /* Not suspended, Pull-down disabled.  */
+  USB_CTRL2->USBCTRL = 0x00;
+  /* DP Pullup in non-OTG device mode.  */
+  USB_CTRL2->CONTROL = 0x10;
+
+  /* Disable all endpoints.  */
+  for (i = 0; i < 16; i++)
+    USB_ENDPT[i].EP = 0;
+
+  /* 
+   * Enable USB FS communication module, clearing all ODD-bits
+   * for BDT.
+   */
+  USB_CTRL1->CTL = 0x03;    
+
+  /* ??? How we can ask re-enumeration?  Is only hard RESET enough? */
+}
+
+static void
+kl27z_set_daddr (uint8_t daddr)
+{
+  USB_CTRL1->ADDR = daddr;
+}
+
+static void
+kl27z_prepare_ep0_setup (struct usb_dev *dev)
+{
+  /* Endpoint 0, TX=0. */
+  BD_table[ep[0].rx_odd].ctrl = 0x00080088; /* Len=8, OWN=1, DATA01=0, DTS=1 */
+  BD_table[ep[0].rx_odd].buf = &dev->dev_req;
+
+  BD_table[!ep[0].rx_odd].ctrl = 0x0000; /* OWN=0 */
+  BD_table[!ep[0].rx_odd].buf = NULL;
+}
+
+static void
+kl27z_prepare_ep0_in (const void *buf, uint8_t len, int data01)
+{
+  /* Endpoint 0, TX=1 *//* OWN=1, DTS=1 */
+  BD_table[2+ep[0].tx_odd].ctrl = (len << 16) | 0x0088 | (data01 << 6); 
+  BD_table[2+ep[0].tx_odd].buf = (void *)buf;
+}
+
+static void
+kl27z_prepare_ep0_out (void *buf, uint8_t len, int data01)
+{
+  /* Endpoint 0, TX=0 *//* OWN=1, DTS=1 */
+  BD_table[ep[0].rx_odd].ctrl = (len << 16) | 0x0088 | (data01 << 6);
+  BD_table[ep[0].rx_odd].buf = buf;
+}
+
+static int
+kl27z_ep_is_disabled (uint8_t n)
+{
+  return (USB_ENDPT[n].EP == 0);
+}
+
+static int
+kl27z_ep_is_stall (uint8_t n)
+{
+  return (USB_ENDPT[n].EP & 0x02) >> 1;
+}
+
+static void
+kl27z_ep_stall (uint8_t n)
+{
+  USB_ENDPT[n].EP |= 0x02;
+}
+
+static void
+kl27z_ep_clear_stall (uint8_t n)
+{
+  USB_ENDPT[n].EP &= ~0x02;
+}
+
+static void
+kl27z_ep_clear_dtog (int rx, uint8_t n)
+{
+  uint32_t config;
+
+  if (!kl27z_ep_is_stall (n))
+    /* Just in case, when the endpoint is active */
+    kl27z_ep_stall (n);
+
+  if (rx)
+    {
+      config = BD_table[4*n+ep[n].rx_odd].ctrl;
+
+      BD_table[4*n+!ep[n].rx_odd].ctrl &= ~(1 << 6);
+      if ((config & 0x0080)) /* OWN already? */
+	{
+	  /*
+	   * How to update BDT entry which is owned by USBFS seems to
+	   * be not clearly documented.  It would be just OK to update
+	   * it as long as the endpoint is stalled (BDT entry is
+	   * actually not in use).  We write 0 at first and then write
+	   * value with OWN, to avoid possible failure.
+	   */
+	  BD_table[4*n+ep[n].rx_odd].ctrl = 0;
+	  BD_table[4*n+ep[n].rx_odd].ctrl = (config & ~(1 << 6));
+	}
+    }
+  else
+    {
+      config = BD_table[4*n+2+ep[n].tx_odd].ctrl;
+
+      BD_table[4*n+2+!ep[n].tx_odd].ctrl &= ~(1 << 6);
+      if ((config & 0x0080)) /* OWN already? */
+	{
+	  BD_table[4*n+2+ep[n].tx_odd].ctrl = 0;
+	  BD_table[4*n+2+ep[n].tx_odd].ctrl = (config & ~(1 << 6));
+	}
+    }
+
+  kl27z_ep_clear_stall (n);
+}
+
+#include "usb_lld_driver.h"
+
+static int handle_transaction (struct usb_dev *dev, uint8_t stat);
+
+void
+usb_lld_stall (int n)
+{
+  kl27z_ep_stall (n);
+}
+
+
+void
+usb_lld_ctrl_error (struct usb_dev *dev)
+{
+  dev->state = STALLED;
+  kl27z_ep_stall (ENDP0);
+}
+
+int
+usb_lld_ctrl_ack (struct usb_dev *dev)
+{
+  /* Zero length packet for ACK.  */
+  dev->state = WAIT_STATUS_IN;
+  kl27z_prepare_ep0_in (&dev->dev_req, 0, DATA1);
+  return USB_EVENT_OK;
+}
+
+
+void
+usb_lld_init (struct usb_dev *dev, uint8_t feature)
+{
+  usb_lld_set_configuration (dev, 0);
+  dev->feature = feature;
+  dev->state = WAIT_SETUP;
+
+  kl27z_set_daddr (0);
+  kl27z_usb_init ();
+
+  /* Enable the endpoint 0.  */
+  USB_ENDPT[0].EP = 0x0d;
+
+  /* Clear Interrupt Status Register, and enable interrupt for USB */
+  USB_CTRL1->ISTAT = 0xff;		     /* All clear */
+
+  USB_CTRL1->INTEN = USB_IS_STALL | USB_IS_TOKDNE
+                   | USB_IS_ERROR | USB_IS_USBRST;
+}
+
+
+#define USB_MAKE_EV(event) (event<<24)
+#define USB_MAKE_TXRX(ep_num,txrx,len) ((txrx? (1<<23):0)|(ep_num<<16)|len)
+
+int
+usb_lld_event_handler (struct usb_dev *dev)
+{
+  uint8_t istat_value = USB_CTRL1->ISTAT;
+  uint8_t stat = USB_CTRL1->STAT;
+
+  if ((istat_value & USB_IS_USBRST))
+    {
+      USB_CTRL1->ISTAT = USB_IS_USBRST;
+      return USB_MAKE_EV (USB_EVENT_DEVICE_RESET);
+    }
+  else if ((istat_value & USB_IS_TOKDNE))
+    return handle_transaction (dev, stat);
+  else if ((istat_value & USB_IS_ERROR))
+    { /* Clear Errors.  */
+      USB_CTRL1->ERRSTAT = USB_CTRL1->ERRSTAT;
+      USB_CTRL1->ISTAT = USB_IS_ERROR;
+    }
+  else if ((istat_value & USB_IS_STALL))
+    {
+      /* Does STAT have ENDPOINT info in this case?: No, it doesn't.  */
+
+      if (kl27z_ep_is_stall (0))
+	{ /* It's endpoint 0, recover from erorr.  */
+	  dev->state = WAIT_SETUP;
+	  kl27z_ep_clear_stall (0);
+	  kl27z_prepare_ep0_setup (dev);
+	}
+
+      USB_CTRL1->ISTAT = USB_IS_STALL;
+    }
+
+  return USB_EVENT_OK;
+}
+
+
+static void
+handle_datastage_out (struct usb_dev *dev, uint8_t stat)
+{
+  struct ctrl_data *data_p = &dev->ctrl_data;
+  int odd = (stat >> 2)&1;
+  int data01 = !((BD_table[odd].ctrl >> 6)&1);
+  uint32_t len = (BD_table[odd].ctrl >> 16)&0x3ff;
+
+  data_p->len -= len;
+  data_p->addr += len;
+
+  len = data_p->len;
+  if (len > USB_MAX_PACKET_SIZE)
+    len = USB_MAX_PACKET_SIZE;
+
+  if (data_p->len == 0)
+    {
+      /* No more data to receive, proceed to send acknowledge for IN.  */
+      dev->state = WAIT_STATUS_IN;
+      kl27z_prepare_ep0_in (&dev->dev_req, 0, DATA1);
+    }
+  else
+    {
+      dev->state = OUT_DATA;
+      kl27z_prepare_ep0_out (data_p->addr, len, data01);
+    }
+}
+
+static void
+handle_datastage_in (struct usb_dev *dev, uint8_t stat)
+{
+  struct ctrl_data *data_p = &dev->ctrl_data;
+  int odd = (stat >> 2)&1;
+  int data01 = !((BD_table[2+odd].ctrl >> 6)&1);
+  uint32_t len = USB_MAX_PACKET_SIZE;
+
+  if ((data_p->len == 0) && (dev->state == LAST_IN_DATA))
+    {
+      if (data_p->require_zlp)
+	{
+	  data_p->require_zlp = 0;
+
+	  /* No more data to send.  Send empty packet */
+	  kl27z_prepare_ep0_in (&dev->dev_req, 0, data01);
+	}
+      else
+	{
+	  /* No more data to send, proceed to receive OUT acknowledge.  */
+	  dev->state = WAIT_STATUS_OUT;
+	  kl27z_prepare_ep0_out (&dev->dev_req, 0, DATA1);
+	}
+
+      return;
+    }
+
+  dev->state = (data_p->len <= len) ? LAST_IN_DATA : IN_DATA;
+
+  if (len > data_p->len)
+    len = data_p->len;
+
+  kl27z_prepare_ep0_in (data_p->addr, len, data01);
+  data_p->len -= len;
+  data_p->addr += len;
+}
+
+typedef int (*HANDLER) (struct usb_dev *dev);
+
+static int
+std_none (struct usb_dev *dev)
+{
+  (void)dev;
+  return -1;
+}
+
+static uint16_t status_info;
+
+static int
+std_get_status (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (arg->value != 0 || arg->len != 2 || (arg->index >> 8) != 0
+      || USB_SETUP_SET (arg->type))
+    return -1;
+
+  if (rcp == DEVICE_RECIPIENT)
+    {
+      if (arg->index == 0)
+	{
+	  /* Get Device Status */
+	  uint8_t feature = dev->feature;
+
+	  /* Remote Wakeup enabled */
+	  if ((feature & (1 << 5)))
+	    status_info |= 2;
+	  else
+	    status_info &= ~2;
+
+	  /* Bus-powered */
+	  if ((feature & (1 << 6)))
+	    status_info |= 1;
+	  else /* Self-powered */
+	    status_info &= ~1;
+
+	  return usb_lld_ctrl_send (dev, &status_info, 2);
+	}
+    }
+  else if (rcp == INTERFACE_RECIPIENT)
+    {
+      if (dev->configuration == 0)
+	return -1;
+
+      return USB_EVENT_GET_STATUS_INTERFACE;
+    }
+  else if (rcp == ENDPOINT_RECIPIENT)
+    {
+      uint8_t n = (arg->index & 0x0f);
+
+      if ((arg->index & 0x70) || n == ENDP0)
+	return -1;
+
+      if (kl27z_ep_is_disabled (n))
+	return -1;
+
+      status_info = kl27z_ep_is_stall (n);
+      return usb_lld_ctrl_send (dev, &status_info, 2);
+    }
+
+  return -1;
+}
+
+static int
+std_clear_feature (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (USB_SETUP_GET (arg->type))
+    return -1;
+
+  if (rcp == DEVICE_RECIPIENT)
+    {
+      if (arg->len != 0 || arg->index != 0)
+	return -1;
+
+      if (arg->value == FEATURE_DEVICE_REMOTE_WAKEUP)
+	{
+	  dev->feature &= ~(1 << 5);
+	  return USB_EVENT_CLEAR_FEATURE_DEVICE;
+	}
+    }
+  else if (rcp == ENDPOINT_RECIPIENT)
+    {
+      uint8_t n = (arg->index & 0x0f);
+
+      if (dev->configuration == 0)
+	return -1;
+
+      if (arg->len != 0 || (arg->index >> 8) != 0
+	  || arg->value != FEATURE_ENDPOINT_HALT || n == ENDP0)
+	return -1;
+
+      if (kl27z_ep_is_disabled (n))
+	return -1;
+
+      kl27z_ep_clear_dtog ((arg->index & 0x80) == 0, n);
+
+      return USB_EVENT_CLEAR_FEATURE_ENDPOINT;
+    }
+
+  return -1;
+}
+
+static int
+std_set_feature (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (USB_SETUP_GET (arg->type))
+    return -1;
+
+  if (rcp == DEVICE_RECIPIENT)
+    {
+      if (arg->len != 0 || arg->index != 0)
+	return -1;
+
+      if (arg->value == FEATURE_DEVICE_REMOTE_WAKEUP)
+	{
+	  dev->feature |= 1 << 5;
+	  return USB_EVENT_SET_FEATURE_DEVICE;
+	}
+    }
+  else if (rcp == ENDPOINT_RECIPIENT)
+    {
+      uint8_t n = (arg->index & 0x0f);
+
+      if (dev->configuration == 0)
+	return -1;
+
+      if (arg->len != 0 || (arg->index >> 8) != 0
+	  || arg->value != FEATURE_ENDPOINT_HALT || n == ENDP0)
+	return -1;
+
+      if (kl27z_ep_is_disabled (n))
+	return -1;
+
+      kl27z_ep_stall (n);
+
+      return USB_EVENT_SET_FEATURE_ENDPOINT;
+    }
+
+  return -1;
+}
+
+static int
+std_set_address (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (USB_SETUP_GET (arg->type))
+    return -1;
+
+  if (rcp == DEVICE_RECIPIENT && arg->len == 0 && arg->value <= 127
+      && arg->index == 0 && dev->configuration == 0)
+    return usb_lld_ctrl_ack (dev);
+
+  return -1;
+}
+
+static int
+std_get_descriptor (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  if (USB_SETUP_SET (arg->type))
+    return -1;
+
+  return USB_EVENT_GET_DESCRIPTOR;
+}
+
+static int
+std_get_configuration (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (USB_SETUP_SET (arg->type))
+    return -1;
+
+  if (arg->value != 0 || arg->index != 0 || arg->len != 1)
+    return -1;
+
+  if (rcp == DEVICE_RECIPIENT)
+    return usb_lld_ctrl_send (dev, &dev->configuration, 1);
+
+  return -1;
+}
+
+static int
+std_set_configuration (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (USB_SETUP_GET (arg->type))
+    return -1;
+
+  if (rcp == DEVICE_RECIPIENT && arg->index == 0 && arg->len == 0)
+    return USB_EVENT_SET_CONFIGURATION;
+
+  return -1;
+}
+
+static int
+std_get_interface (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (USB_SETUP_SET (arg->type))
+    return -1;
+
+  if (arg->value != 0 || (arg->index >> 8) != 0 || arg->len != 1)
+    return -1;
+
+  if (dev->configuration == 0)
+    return -1;
+
+  if (rcp == INTERFACE_RECIPIENT)
+    return USB_EVENT_GET_INTERFACE;
+
+  return -1;
+}
+
+static int
+std_set_interface (struct usb_dev *dev)
+{
+  struct device_req *arg = &dev->dev_req;
+  uint8_t rcp = arg->type & RECIPIENT;
+
+  if (USB_SETUP_GET (arg->type) || rcp != INTERFACE_RECIPIENT
+      || arg->len != 0 || (arg->index >> 8) != 0
+      || (arg->value >> 8) != 0 || dev->configuration == 0)
+    return -1;
+
+  return USB_EVENT_SET_INTERFACE;
+}
+
+
+static int
+handle_setup0 (struct usb_dev *dev)
+{
+  struct ctrl_data *data_p = &dev->ctrl_data;
+  int r = -1;
+  HANDLER handler;
+
+  data_p->addr = NULL;
+  data_p->len = 0;
+  data_p->require_zlp = 0;
+
+  if ((dev->dev_req.type & REQUEST_TYPE) == STANDARD_REQUEST)
+    {
+      switch (dev->dev_req.request)
+	{
+	case 0: handler = std_get_status;  break;
+	case 1: handler = std_clear_feature;  break;
+	case 3: handler = std_set_feature;  break;
+	case 5: handler = std_set_address;  break;
+	case 6: handler = std_get_descriptor;  break;
+	case 8: handler = std_get_configuration;  break;
+	case 9: handler = std_set_configuration;  break;
+	case 10: handler = std_get_interface;  break;
+	case 11: handler = std_set_interface;  break;
+	default: handler = std_none;  break;
+	}
+
+      if ((r = (*handler) (dev)) < 0)
+	{
+	  usb_lld_ctrl_error (dev);
+	  return USB_EVENT_OK;
+	}
+      else
+	return r;
+    }
+  else
+    return USB_EVENT_CTRL_REQUEST;
+}
+
+static int
+handle_in0 (struct usb_dev *dev, uint8_t stat)
+{
+  int r = 0;
+
+  if (dev->state == IN_DATA || dev->state == LAST_IN_DATA)
+    handle_datastage_in (dev, stat);
+  else if (dev->state == WAIT_STATUS_IN)
+    { /* Control WRITE transfer done successfully.  */
+      uint16_t value = dev->dev_req.value;
+
+      if ((dev->dev_req.request == SET_ADDRESS) &&
+	  ((dev->dev_req.type & (REQUEST_TYPE | RECIPIENT))
+	   == (STANDARD_REQUEST | DEVICE_RECIPIENT)))
+	{
+	  kl27z_set_daddr (value);
+	  ep[0].rx_odd = 0;
+	  r = USB_EVENT_DEVICE_ADDRESSED;
+	}
+      else
+	r = USB_EVENT_CTRL_WRITE_FINISH;
+      dev->state = WAIT_SETUP;
+      kl27z_prepare_ep0_setup (dev);
+    }
+  else
+    {
+      dev->state = STALLED;
+      kl27z_ep_stall (ENDP0);
+    }
+
+  return r;
+}
+
+static void
+handle_out0 (struct usb_dev *dev, uint8_t stat)
+{
+  if (dev->state == OUT_DATA)
+    /* It's normal control WRITE transfer.  */
+    handle_datastage_out (dev, stat);
+  else if (dev->state == WAIT_STATUS_OUT)
+    { /* Control READ transfer done successfully.  */
+      dev->state = WAIT_SETUP;
+      kl27z_prepare_ep0_setup (dev);
+    }
+  else
+    {
+      /*
+       * dev->state == IN_DATA || dev->state == LAST_IN_DATA
+       * (Host aborts the transfer before finish)
+       * Or else, unexpected state.
+       * STALL the endpoint, until we receive the next SETUP token.
+       */
+      dev->state = STALLED;
+      kl27z_ep_stall (ENDP0);
+    }
+}
+
+#define USB_TOKEN_ACK   0x02
+#define USB_TOKEN_IN    0x09
+#define USB_TOKEN_SETUP 0x0d
+
+static int
+handle_transaction (struct usb_dev *dev, uint8_t stat)
+{
+  int odd = (stat >> 2)&1;
+  uint8_t ep_num = (stat >> 4);
+  int r;
+
+  if (ep_num == 0)
+    {
+      if ((stat & 0x08) == 0)
+	{
+	  ep[0].rx_odd ^= 1;
+	  if (TOK_PID (BD_table[odd].ctrl) == USB_TOKEN_SETUP)
+	    {
+	      r = handle_setup0 (dev);
+	      USB_CTRL1->ISTAT = USB_IS_TOKDNE;
+	      USB_CTRL1->CTL = 0x01; /* Clear TXSUSPENDTOKENBUSY.  */
+	      return USB_MAKE_EV (r);
+	    }
+	  else
+	    {
+	      handle_out0 (dev, stat);
+	      USB_CTRL1->ISTAT = USB_IS_TOKDNE;
+	      return USB_EVENT_OK;
+	    }
+	}
+      else
+	{
+	  ep[0].tx_odd ^= 1;
+	  r = handle_in0 (dev, stat);
+	  USB_CTRL1->ISTAT = USB_IS_TOKDNE;
+	  return USB_MAKE_EV (r);
+	}
+    }
+  else
+    {
+      uint16_t len;
+
+      if ((stat & 0x08) == 0)
+	{
+	  len = (BD_table[4*ep_num+odd].ctrl >> 16)&0x3ff;
+	  ep[ep_num].rx_odd ^= 1;
+	  USB_CTRL1->ISTAT = USB_IS_TOKDNE;
+	  return USB_MAKE_TXRX (ep_num, 0, len);
+	}
+      else
+	{
+	  /*
+	   * IN transaction is usually in a sequence like:
+	   *
+	   *           -----time------>
+	   *   host:   IN          ACK
+	   *   device:     DATA0/1 
+	   *
+	   * Although it is not described in the specification (it's
+	   * ambiguous), it is actually possible for some host
+	   * implementation to send back a NAK on erroneous case like
+	   * a device sent oversized data.
+	   *
+	   *           -----time------>
+	   *   host:   IN          NAK
+	   *   device:     DATA0/1 
+	   *
+	   * We do our best to distinguish successful tx and tx with
+	   * failure.
+	   *
+	   */
+	  uint32_t dmaerr = (USB_CTRL1->ERRSTAT & (1 << 5));
+	  int success = (dmaerr == 0);
+
+	  len = (BD_table[4*ep_num+2+odd].ctrl >> 16)&0x3ff;
+	  if (!success)
+	    USB_CTRL1->ERRSTAT = dmaerr; /* Clear error.  */
+
+	  ep[ep_num].tx_odd ^= 1;
+	  USB_CTRL1->ISTAT = USB_IS_TOKDNE;
+	  return USB_MAKE_TXRX (ep_num, 1, len);
+	}
+    }
+}
+
+void
+usb_lld_reset (struct usb_dev *dev, uint8_t feature)
+{
+  usb_lld_set_configuration (dev, 0);
+  dev->feature = feature;
+  dev->state = WAIT_SETUP;
+
+  /* Reset USB */
+  USB_CTRL2->USBTRC0 = 0xc0;
+
+  USB_CTRL1->CTL = 0x00;    /* Disable USB FS communication module */
+
+  kl27z_set_daddr (0);
+  kl27z_usb_init ();
+
+  /* Clear Interrupt Status Register, and enable interrupt for USB */
+  USB_CTRL1->ISTAT = 0xff;		     /* All clear */
+
+  USB_CTRL1->INTEN = USB_IS_STALL | USB_IS_TOKDNE
+                   | USB_IS_ERROR | USB_IS_USBRST;
+}
+
+void
+usb_lld_setup_endp (struct usb_dev *dev, int n, int rx_en, int tx_en)
+{
+  if (n == 0)
+    {
+      /* Enable the endpoint 0.  */
+      USB_ENDPT[0].EP = 0x0d;
+      kl27z_prepare_ep0_setup (dev);
+    }
+  else
+    {
+      /* Enable the endpoint.  */
+      USB_ENDPT[n].EP = (rx_en << 3)|(tx_en << 2)|0x11;
+
+      /* Configure BDT entry so that it starts with DATA0.  */
+
+      /* RX */
+      BD_table[4*n+ep[n].rx_odd].ctrl = 0x0000;
+      BD_table[4*n+ep[n].rx_odd].buf = NULL;
+      BD_table[4*n+!ep[n].rx_odd].ctrl = 0x0040;
+      BD_table[4*n+!ep[n].rx_odd].buf = NULL;
+
+      /* TX */
+      BD_table[4*n+2+ep[n].tx_odd].ctrl = 0x0000;
+      BD_table[4*n+2+ep[n].tx_odd].buf = NULL;
+      BD_table[4*n+2+!ep[n].tx_odd].ctrl = 0x0040;
+      BD_table[4*n+2+!ep[n].tx_odd].buf = NULL;
+    }
+}
+
+
+void
+usb_lld_set_configuration (struct usb_dev *dev, uint8_t config)
+{
+  dev->configuration = config;
+}
+
+uint8_t
+usb_lld_current_configuration (struct usb_dev *dev)
+{
+  return dev->configuration;
+}
+
+int
+usb_lld_ctrl_recv (struct usb_dev *dev, void *p, size_t len)
+{
+  struct ctrl_data *data_p = &dev->ctrl_data;
+  data_p->addr = (uint8_t *)p;
+  data_p->len = len;
+  if (len > USB_MAX_PACKET_SIZE)
+    len = USB_MAX_PACKET_SIZE;
+
+  kl27z_prepare_ep0_out (p, len, DATA1);
+  dev->state = OUT_DATA;
+  return USB_EVENT_OK;
+}
+
+/*
+ * BUF: Pointer to data memory.  Data memory should not be allocated
+ *      on stack when BUFLEN > USB_MAX_PACKET_SIZE.
+ *
+ * BUFLEN: size of the data.
+ */
+int
+usb_lld_ctrl_send (struct usb_dev *dev, const void *buf, size_t buflen)
+{
+  struct ctrl_data *data_p = &dev->ctrl_data;
+  uint32_t len_asked = dev->dev_req.len;
+  uint32_t len;
+
+  data_p->addr = (void *)buf;
+  data_p->len = buflen;
+
+  /* Restrict the data length to be the one host asks for */
+  if (data_p->len > len_asked)
+    data_p->len = len_asked;
+
+  data_p->require_zlp = (data_p->len != 0
+			 && (data_p->len % USB_MAX_PACKET_SIZE) == 0);
+
+  if (data_p->len < USB_MAX_PACKET_SIZE)
+    {
+      len = data_p->len;
+      dev->state = LAST_IN_DATA;
+    }
+  else
+    {
+      len = USB_MAX_PACKET_SIZE;
+      dev->state = IN_DATA;
+    }
+
+  kl27z_prepare_ep0_in (data_p->addr, len, DATA1);
+
+  data_p->len -= len;
+  data_p->addr += len;
+
+  return USB_EVENT_OK;
+}
+
+void
+usb_lld_rx_enable_buf (int n, void *buf, size_t len)
+{
+  int data01 = !((BD_table[4*n+!ep[n].rx_odd].ctrl >> 6)&1);
+
+  BD_table[4*n+ep[n].rx_odd].ctrl = (len << 16) | 0x0088 | (data01 << 6);
+  BD_table[4*n+ep[n].rx_odd].buf = buf;
+}
+
+
+void
+usb_lld_tx_enable_buf (int n, const void *buf, size_t len)
+{
+  int data01 = !((BD_table[4*n+2+!ep[n].tx_odd].ctrl >> 6)&1);
+
+  BD_table[4*n+2+ep[n].tx_odd].ctrl = (len << 16) | 0x0088 | (data01 << 6); 
+  BD_table[4*n+2+ep[n].tx_odd].buf = (void *)buf;
+}
--- a/example-cdc/usb_stm32f103.c
+++ b/example-cdc/usb_stm32f103.c
--- a/mcu/usb-usbip.c
+++ b/mcu/usb-usbip.c
--- a/rules.mk
+++ b/rules.mk
@@ -6,13 +6,31 @@ ifneq ($(USE_EVENTFLAG),)
 CSRC += $(CHOPSTX)/eventflag.c
 endif

+ifneq ($(USE_SYS),)
+CSRC += $(CHOPSTX)/mcu/sys-$(CHIP).c
+endif
+ifneq ($(USE_USB),)
+ifeq ($(EMULATION),)
+CSRC += $(CHOPSTX)/mcu/usb-$(CHIP).c
+else
+CSRC += $(CHOPSTX)/mcu/usb-usbip.c
+endif
+endif
+ifneq ($(USE_ADC),)
+CSRC += $(CHOPSTX)/contrib/adc-$(CHIP).c
+endif
+
 INCDIR += $(CHOPSTX)

 BUILDDIR = build
+ifeq ($(EMULATION),)
 OUTFILES = $(BUILDDIR)/$(PROJECT).elf $(BUILDDIR)/$(PROJECT).bin
 ifneq ($(ENABLE_OUTPUT_HEX),)
 OUTFILES += $(BUILDDIR)/$(PROJECT).hex
 endif
+else
+OUTFILES  = $(BUILDDIR)/$(PROJECT)
+endif


 OPT += -ffunction-sections -fdata-sections -fno-common
@@ -24,14 +42,23 @@ LLIBDIR   = $(patsubst %,-L%,$(LIBDIR))

 VPATH     = $(sort $(dir $(CSRC)))
 ###
+ifeq ($(EMULATION),)
 MCFLAGS   = -mcpu=$(MCU)
+LDFLAGS   = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) \
+            -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--no-warn-mismatch,--gc-sections
+else
+MCFLAGS   =
+LDFLAGS   =
+DEFS      += -D_GNU_SOURCE
+endif

 CFLAGS    = $(MCFLAGS) $(OPT) $(CWARN) -Wa,-alms=$(BUILDDIR)/$(notdir $(<:.c=.lst)) $(DEFS)
+LDFLAGS  += $(LLIBDIR)

-LDFLAGS = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--no-warn-mismatch,--gc-sections $(LLIBDIR)
-
+ifeq ($(EMULATION),)
 CFLAGS   += -mthumb -mno-thumb-interwork -DTHUMB
 LDFLAGS  += -mthumb -mno-thumb-interwork
+endif

 CFLAGS   += -MD -MP -MF .dep/$(@F).d

@@ -46,6 +73,7 @@ $(OBJS) : $(BUILDDIR)/%.o : %.c Makefile
 	@echo
 	$(CC) -c $(CFLAGS) -I. $(IINCDIR) $< -o $@

+ifeq ($(EMULATION),)
 %.elf: $(OBJS) $(OBJS_ADD) $(LDSCRIPT)
 	@echo
 	$(LD) $(OBJS) $(OBJS_ADD) $(LDFLAGS) $(LIBS) -o $@
@@ -55,6 +83,11 @@ $(OBJS) : $(BUILDDIR)/%.o : %.c Makefile

 %.hex: %.elf $(LDSCRIPT)
 	$(OBJCOPY) -O ihex $< $@
+else
+$(BUILDDIR)/$(PROJECT): $(OBJS) $(OBJS_ADD)
+	@echo
+	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(OBJS_ADD) $(LIBS)
+endif

 clean:
 	-rm -f -r .dep $(BUILDDIR)
--- a/sys.h
+++ b/sys.h
@@ -0,0 +1,7 @@
+#if  defined(MCU_KINETIS_L)
+#include "mcu/sys-mkl27z.h"
+#elif defined(MCU_STM32F0)
+#include "mcu/sys-stm32f0.h"
+#else
+#include "mcu/sys-stm32f103.h"
+#endif
--- a/usb_lld.h
+++ b/usb_lld.h
@@ -0,0 +1,171 @@
+#define STANDARD_ENDPOINT_DESC_SIZE             0x09
+
+/* endpoints enumeration */
+#define ENDP0       ((uint8_t)0)
+#define ENDP1       ((uint8_t)1)
+#define ENDP2       ((uint8_t)2)
+#define ENDP3       ((uint8_t)3)
+#define ENDP4       ((uint8_t)4)
+#define ENDP5       ((uint8_t)5)
+#define ENDP6       ((uint8_t)6)
+#define ENDP7       ((uint8_t)7)
+
+enum RECIPIENT_TYPE
+{
+  DEVICE_RECIPIENT = 0, /* Recipient device    */
+  INTERFACE_RECIPIENT,  /* Recipient interface */
+  ENDPOINT_RECIPIENT,   /* Recipient endpoint  */
+  OTHER_RECIPIENT
+};
+
+enum DESCRIPTOR_TYPE
+{
+  DEVICE_DESCRIPTOR = 1,
+  CONFIG_DESCRIPTOR,
+  STRING_DESCRIPTOR,
+  INTERFACE_DESCRIPTOR,
+  ENDPOINT_DESCRIPTOR
+};
+
+#define REQUEST_DIR       0x80  /* Mask to get request dir  */
+#define REQUEST_TYPE      0x60  /* Mask to get request type */
+#define STANDARD_REQUEST  0x00  /* Standard request         */
+#define CLASS_REQUEST     0x20  /* Class request            */
+#define VENDOR_REQUEST    0x40  /* Vendor request           */
+#define RECIPIENT         0x1F  /* Mask to get recipient    */
+
+#define USB_SETUP_SET(req) ((req & REQUEST_DIR) == 0)
+#define USB_SETUP_GET(req) ((req & REQUEST_DIR) != 0)
+
+struct device_req {
+  uint8_t type;
+  uint8_t request;
+  uint16_t value;
+  uint16_t index;
+  uint16_t len;
+};
+
+struct ctrl_data {
+  uint8_t *addr;
+  uint16_t len;
+  uint8_t require_zlp;
+};
+
+struct usb_dev {
+  uint8_t configuration;
+  uint8_t feature;
+  uint8_t state;
+  struct device_req dev_req;
+  struct ctrl_data ctrl_data;
+};
+
+enum {
+  USB_EVENT_OK=0,		/* Processed in lower layer.  */
+  /* Device reset and suspend.  */
+  USB_EVENT_DEVICE_RESET,
+  USB_EVENT_DEVICE_SUSPEND,
+  /* Device Requests (Control WRITE Transfer): Standard */
+  USB_EVENT_SET_CONFIGURATION,
+  USB_EVENT_SET_INTERFACE,
+  USB_EVENT_SET_FEATURE_DEVICE,
+  USB_EVENT_SET_FEATURE_ENDPOINT,
+  USB_EVENT_CLEAR_FEATURE_DEVICE,
+  USB_EVENT_CLEAR_FEATURE_ENDPOINT,
+  /* Device Requests (Control READ Transfer): Standard */
+  USB_EVENT_GET_STATUS_INTERFACE,
+  USB_EVENT_GET_DESCRIPTOR,
+  USB_EVENT_GET_INTERFACE,
+  /* Device Requests (Control READ/WRITE Transfer): Non-Standard */
+  USB_EVENT_CTRL_REQUEST,
+  USB_EVENT_CTRL_WRITE_FINISH,
+  /* Device addressed.  */
+  USB_EVENT_DEVICE_ADDRESSED,
+};
+
+enum DEVICE_STATE {
+  UNCONNECTED,
+  ATTACHED,
+  POWERED,
+  SUSPENDED,
+  ADDRESSED,
+  CONFIGURED
+};
+
+void usb_lld_init (struct usb_dev *dev, uint8_t feature);
+
+/*
+ * Return value is encoded integer:
+ *     event-no:    8-bit, 0 if TX/RX
+ *     tx/rx-flag:  1-bit, 0 if rx, 1 if tx
+ *     endpoint no: 7-bit
+ *     length:      16-bit
+ */
+#define USB_EVENT_TXRX(e) ((e >> 23) & 1)
+#define USB_EVENT_LEN(e) (e & 0xffff)
+#define USB_EVENT_ENDP(e) ((e >> 16) & 0x7f)
+#define USB_EVENT_ID(e) ((e >> 24))
+int usb_lld_event_handler (struct usb_dev *dev);
+
+/*
+ * Control Endpoint ENDP0 does device requests handling.
+ * In response to an event of
+ *     USB_EVENT_SET_CONFIGURATION
+ *     USB_EVENT_SET_INTERFACE
+ *     USB_EVENT_SET_FEATURE_DEVICE
+ *     USB_EVENT_SET_FEATURE_ENDPOINT
+ *     USB_EVENT_CLEAR_FEATURE_DEVICE
+ *     USB_EVENT_CLEAR_FEATURE_ENDPOINT
+ *     USB_EVENT_GET_STATUS_INTERFACE
+ *     USB_EVENT_GET_DESCRIPTOR
+ *     USB_EVENT_GET_INTERFACE
+ *     USB_EVENT_CTRL_REQUEST
+ *  a single action should be done, which is SEND, RECV, or,
+ *  ACKNOWLEDGE (no data to be sent, or to be received).
+ *  Otherwise, it's an error.
+ */
+int usb_lld_ctrl_send (struct usb_dev *dev, const void *buf, size_t buflen);
+int usb_lld_ctrl_recv (struct usb_dev *dev, void *p, size_t len);
+int usb_lld_ctrl_ack (struct usb_dev *dev);
+void usb_lld_ctrl_error (struct usb_dev *dev);
+
+void usb_lld_reset (struct usb_dev *dev, uint8_t feature);
+void usb_lld_set_configuration (struct usb_dev *dev, uint8_t config);
+uint8_t usb_lld_current_configuration (struct usb_dev *dev);
+void usb_lld_prepare_shutdown (void);
+void usb_lld_shutdown (void);
+
+#if defined(MCU_KINETIS_L)
+void usb_lld_tx_enable_buf (int ep_num, const void *buf, size_t len);
+void usb_lld_rx_enable_buf (int ep_num, void *buf, size_t len);
+
+void usb_lld_setup_endp (struct usb_dev *dev, int ep_num, int rx_en, int tx_en);
+void usb_lld_stall (int ep_num);
+#elif defined(GNU_LINUX_EMULATION)
+void usb_lld_tx_enable_buf (int ep_num, const void *buf, size_t len);
+void usb_lld_rx_enable_buf (int ep_num, void *buf, size_t len);
+
+void usb_lld_setup_endp (struct usb_dev *dev, int ep_num, int rx_en, int tx_en);
+void usb_lld_stall_tx (int ep_num);
+void usb_lld_stall_rx (int ep_num);
+#else
+/* EP_TYPE[1:0] EndPoint TYPE */
+#define EP_BULK        (0x0000) /* EndPoint BULK        */
+#define EP_CONTROL     (0x0200) /* EndPoint CONTROL     */
+#define EP_ISOCHRONOUS (0x0400) /* EndPoint ISOCHRONOUS */
+#define EP_INTERRUPT   (0x0600) /* EndPoint INTERRUPT   */
+
+void usb_lld_tx_enable (int ep_num, size_t len);
+void usb_lld_rx_enable (int ep_num);
+
+void usb_lld_setup_endpoint (int ep_num, int ep_type, int ep_kind,
+			     int ep_rx_addr, int ep_tx_addr,
+			     int ep_rx_memory_size);
+void usb_lld_stall_tx (int ep_num);
+void usb_lld_stall_rx (int ep_num);
+
+void usb_lld_txcpy (const void *src, int ep_num, int offset, size_t len);
+void usb_lld_write (uint8_t ep_num, const void *buf, size_t len);
+void usb_lld_rxcpy (uint8_t *dst, int ep_num, int offset, size_t len);
+void usb_lld_to_pmabuf (const void *src, uint16_t addr, size_t n);
+void usb_lld_from_pmabuf (void *dst, uint16_t addr, size_t n);
+#endif
--- a/usb_lld_driver.h
+++ b/usb_lld_driver.h
@@ -0,0 +1,37 @@
+#define USB_MAX_PACKET_SIZE 64	/* For FS device */
+
+enum STANDARD_REQUESTS
+{
+  GET_STATUS = 0,
+  CLEAR_FEATURE,
+  RESERVED1,
+  SET_FEATURE,
+  RESERVED2,
+  SET_ADDRESS,
+  GET_DESCRIPTOR,
+  SET_DESCRIPTOR,
+  GET_CONFIGURATION,
+  SET_CONFIGURATION,
+  GET_INTERFACE,
+  SET_INTERFACE,
+  SYNCH_FRAME,
+  TOTAL_REQUEST  /* Total number of Standard request */
+};
+
+/* The state machine states of a control pipe */
+enum CONTROL_STATE
+{
+  WAIT_SETUP,
+  IN_DATA,
+  OUT_DATA,
+  LAST_IN_DATA,
+  WAIT_STATUS_IN,
+  WAIT_STATUS_OUT,
+  STALLED,
+};
+
+enum FEATURE_SELECTOR
+{
+  FEATURE_ENDPOINT_HALT=0,
+  FEATURE_DEVICE_REMOTE_WAKEUP=1
+};
Author	SHA1	Message	Date
NIIBE Yutaka	d8df82badf	Version 1.4.	2017-08-11 19:57:57 +09:00
NIIBE Yutaka	f51a54e4c6	Version 1.4. Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>	2017-08-11 19:50:56 +09:00
Jeremy Drake	5fe5ff36c4	Allow compile-time override of detected flash size. On the STM32F103C8, as used in the "blue pill" boards, it has been determined that, despite these only officially having 64KiB flash, it is possible to actually use 128KiB of flash. This commit allows for a preprocessor define STM32F103_OVERRIDE_FLASH_SIZE which, when set, is used as the size of flash in KiB instead of reading it from the FLASH_SIZE_REG.	2017-08-03 20:48:13 +09:00
NIIBE Yutaka	a4f28ee176	Add adc-gnu-linux driver. Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>	2017-08-02 14:19:10 +09:00
NIIBE Yutaka	87767f1be5	Fix error handling of USB-USBIP driver.	2017-07-07 15:46:37 +09:00
NIIBE Yutaka	8b018df382	Add EXAMPLE-README.	2017-07-06 16:06:46 +09:00
NIIBE Yutaka	5d9802388c	Fix USB driver on GNU/Linux.	2017-07-06 15:52:46 +09:00
NIIBE Yutaka	478dd2c784	Add example-fraucheky.	2017-07-05 19:37:41 +09:00
NIIBE Yutaka	6f7a591417	Fix usb-usbip.c.	2017-06-28 16:23:41 +09:00
NIIBE Yutaka	d142cbbea3	Added CDC-ACM sample of USBIP.	2017-06-27 15:46:04 +09:00
NIIBE Yutaka	f011d643e9	Add board-gnu-linux.h for emulation.	2017-06-26 19:53:26 +09:00
NIIBE Yutaka	1fbbf66e8e	Fix for GNU/Linux emulation.	2017-06-26 19:52:19 +09:00
NIIBE Yutaka	1f7d4a6aac	Fix usb drivers.	2017-06-26 19:50:55 +09:00
NIIBE Yutaka	526b8fec2a	Added USBIP driver for emulation.	2017-06-26 19:32:43 +09:00
NIIBE Yutaka	5419580519	Support emulation on GNU/Linux.	2017-06-26 19:32:23 +09:00
NIIBE Yutaka	78c825afe8	Add GNU/Linux support (not yet makefile).	2017-06-23 09:05:11 +09:00
NIIBE Yutaka	1bd14d8d40	Factor out arch dependent code.	2017-06-23 09:03:26 +09:00
NIIBE Yutaka	80258ba7c7	Remove naked attribute from chopstx_exit.	2017-06-22 10:04:45 +09:00
NIIBE Yutaka	ca1b22c3eb	Use ->V for the return value of chx_sched.	2017-06-21 20:48:50 +09:00
NIIBE Yutaka	6c68c55301	Change exit value access.	2017-06-21 17:16:01 +09:00
NIIBE Yutaka	d941299149	Fix chx_wakeup.	2017-06-16 10:31:40 +09:00
NIIBE Yutaka	b2b0eb7418	Fix MKL27Z USB.	2017-06-16 10:29:00 +09:00
NIIBE Yutaka	7798e620a6	Fix access to REG_R0 at chx_wakeup.	2017-05-18 11:09:03 +09:00
NIIBE Yutaka	89eb54929e	Version 1.3.	2017-02-02 12:56:13 +09:00
NIIBE Yutaka	a96f84ff74	Add Blue Pill support.	2017-02-01 17:31:52 +09:00
Szczepan Zalega	9d84537c13	Switch off red LED for Nitrokey Start. Signed-off-by: Szczepan Zalega <szczepan@nitrokey.com>	2017-02-01 15:24:55 +09:00
NIIBE Yutaka	d448d3c678	Version 1.2	2016-10-13 10:18:47 +09:00
NIIBE Yutaka	bc664fe943	chopstx_join is cancellation point.	2016-10-12 12:06:37 +09:00
NIIBE Yutaka	08cca6b9f8	stackaddr/size change	2016-07-11 17:21:32 +09:00
NIIBE Yutaka	c9d59a3f3f	mcu/stm32f103.h: Add more constants from Gnuk 1.1.9	2016-07-11 11:38:58 +09:00
NIIBE Yutaka	09f27704f5	Version 1.1	2016-07-01 11:50:25 +09:00
NIIBE Yutaka	1f23bd4048	Change touch button for MKL27Z	2016-07-01 10:58:05 +09:00
NIIBE Yutaka	f5880ee5d5	Change API of chopstx_setpriority	2016-07-01 09:51:32 +09:00
NIIBE Yutaka	c7e571eca0	update doc	2016-06-30 16:41:32 +09:00
NIIBE Yutaka	0decd305b9	chopstx_poll example fix	2016-06-30 16:26:52 +09:00
NIIBE Yutaka	a2a29146a6	const pointer cleanup	2016-06-30 16:23:29 +09:00
NIIBE Yutaka	e7bd234a0d	Update for MKL27Z	2016-06-30 16:16:39 +09:00
NIIBE Yutaka	c71a24ddcb	MKL27Z touch	2016-06-29 17:05:33 +09:00
NIIBE Yutaka	663cbabe7c	Fix MKL27Z TPM registers	2016-06-29 16:51:16 +09:00
NIIBE Yutaka	41ac81a66b	Update example for fs-bb48	2016-06-29 16:38:18 +09:00
NIIBE Yutaka	986518fba7	fix setpriority	2016-06-29 16:36:53 +09:00
NIIBE Yutaka	15a4403f24	chopstx_poll change	2016-06-28 15:48:15 +09:00
Niibe Yutaka	40adf95c24	Version 1.0	2016-06-16 11:46:38 +09:00
Niibe Yutaka	5a7381ece6	Add FST-01G	2016-06-16 11:31:10 +09:00
Niibe Yutaka	52626a3368	chopstx_exit change	2016-06-15 12:41:12 +09:00
Niibe Yutaka	440188c373	Fix USB for STM32	2016-06-14 15:10:07 +09:00
NIIBE Yutaka	a6541cbcc6	NONE sounds bad, use OK instead	2016-06-10 08:25:00 +09:00
NIIBE Yutaka	74c7b5bcb3	minor comment change	2016-06-09 10:07:31 +09:00
NIIBE Yutaka	4d7e97028e	More update of USB API	2016-06-09 09:53:15 +09:00
NIIBE Yutaka	d061e6f931	USB for FS-BB48	2016-06-08 15:43:11 +09:00
NIIBE Yutaka	5f1c26ff17	USB API major change	2016-06-08 15:40:55 +09:00
NIIBE Yutaka	78718e57df	Move files	2016-06-02 11:01:11 +09:00
NIIBE Yutaka	a756987d2a	Fix chx_fatal	2016-06-01 07:47:58 +09:00
NIIBE Yutaka	b6e3a1aba1	Relicense ADC driver with GPLv3+ plus EXCEPTION	2016-05-31 21:41:40 +09:00
NIIBE Yutaka	c79a41870a	Version 0.12	2016-05-31 15:18:10 +09:00
NIIBE Yutaka	4889a5386b	STM32F030: Fix use of vector on RAM	2016-05-31 15:12:55 +09:00
NIIBE Yutaka	e02f2e71e6	Fix `f2a8b01607`	2016-05-31 14:18:12 +09:00
NIIBE Yutaka	1fa89d1754	Change USB API a bit	2016-05-31 13:13:14 +09:00
NIIBE Yutaka	03a1d46c08	Fix sys-stm32f103.h	2016-05-31 12:00:25 +09:00
NIIBE Yutaka	3a4e1f2bd5	Cleanup of sys and its macro	2016-05-31 11:49:01 +09:00
NIIBE Yutaka	421fd8019b	; ABOUT-SYS	2016-05-30 20:34:06 +09:00
NIIBE Yutaka	e8eaeced77	Update USB for stm32f103	2016-05-30 20:11:18 +09:00
NIIBE Yutaka	1ae3caf7fc	USB cleanup	2016-05-30 20:06:43 +09:00
NIIBE Yutaka	a933eebfd5	Update for STM32F103	2016-05-30 15:13:55 +09:00
NIIBE Yutaka	fae4c58d99	AES table is included in sys-stm32f103.c	2016-05-30 14:57:51 +09:00
NIIBE Yutaka	9f16e5e051	consolidate mcu-chip specific code	2016-05-30 14:57:10 +09:00
NIIBE Yutaka	b90e58f763	Move CHIP specific things to mcu/	2016-05-30 14:39:02 +09:00
NIIBE Yutaka	8209f38755	example-fs-bb48: Add flash ROM handling	2016-05-30 14:06:18 +09:00
NIIBE Yutaka	781ad1847c	example-fs-bb48: rm crc32.h	2016-05-27 17:29:36 +09:00
NIIBE Yutaka	8eb2130664	example-fs-bb48: rm crc32.h	2016-05-27 17:29:08 +09:00
NIIBE Yutaka	960921f537	example-fs-bb48: SYS implementation	2016-05-27 17:17:44 +09:00
NIIBE Yutaka	f2a8b01607	Fix IDLE thread	2016-05-27 16:19:02 +09:00
NIIBE Yutaka	890d108114	Add document for ABOUT-SYS	2016-05-27 11:22:29 +09:00
NIIBE Yutaka	5f57222b73	Move clk_gpio_init to mcu/	2016-05-26 17:40:47 +09:00
NIIBE Yutaka	d81767b7c7	example-fs-bb48: Only use LS-8-bit	2016-05-26 17:29:06 +09:00
NIIBE Yutaka	91823d0fc1	Move kl_sim.h	2016-05-26 10:21:30 +09:00
NIIBE Yutaka	51cd47c3b7	example-fs-bb48: ADC use DIV1	2016-05-26 09:54:44 +09:00
NIIBE Yutaka	cf81e7a6dc	example-fs-bb48: ADC added	2016-05-26 09:50:07 +09:00
NIIBE Yutaka	2578fc0f30	Update example-fs-bb48	2016-05-24 17:34:20 +09:00
NIIBE Yutaka	2704416c38	Fix PSR handling (ORRS instruction changes PSR)	2016-05-23 20:15:47 +09:00
NIIBE Yutaka	77255b0c1d	Fix chopstx_poll	2016-05-23 17:45:10 +09:00
NIIBE Yutaka	eeb354119c	Change example-cdc	2016-05-23 17:42:21 +09:00
NIIBE Yutaka	72c3d59555	Change example-fs-bb48	2016-05-23 17:42:01 +09:00
NIIBE Yutaka	8ba91f5db6	Fix example-fs-bb48 to support 16 endpoints	2016-05-23 17:36:31 +09:00
NIIBE Yutaka	b6603f6771	Update example-fs-bb48	2016-05-23 13:48:24 +09:00
NIIBE Yutaka	ee92bb15b3	Remove deprecated API	2016-05-23 13:00:33 +09:00
NIIBE Yutaka	5458b77d36	Version 0.11	2016-05-19 12:22:30 +09:00
NIIBE Yutaka	03bba13005	eventflag API addtiion	2016-05-19 11:48:01 +09:00
NIIBE Yutaka	1b0fe5a6e8	Add eventflag_set_poll_desc	2016-05-18 21:32:32 +09:00
NIIBE Yutaka	5e33e7f468	fix eventflag	2016-05-18 17:00:25 +09:00
NIIBE Yutaka	db413813b6	eventflag rewrite	2016-05-18 16:52:00 +09:00
NIIBE Yutaka	7f009dbb5d	update ChangeLog	2016-05-18 14:43:30 +09:00
NIIBE Yutaka	cea3200e48	Cleanup chopstx.c	2016-05-18 13:27:00 +09:00
NIIBE Yutaka	d93206882d	Fix mutex_lock and join	2016-05-18 11:40:15 +09:00
NIIBE Yutaka	a17d12192f	Fix example-cdc more	2016-05-18 09:55:23 +09:00
NIIBE Yutaka	4c1aa50f13	Fix example-cdc	2016-05-18 08:51:50 +09:00
NIIBE Yutaka	cf76b0bf13	example-cdc cleanup more	2016-05-17 21:33:58 +09:00
NIIBE Yutaka	76cbff737b	example-cdc cleanup	2016-05-17 20:49:17 +09:00
NIIBE Yutaka	dce6c70ffc	more fix for chopstx_poll	2016-05-17 17:51:41 +09:00
NIIBE Yutaka	3651aa64b4	ll_dequeue for PX only when not ready	2016-05-16 20:37:33 +09:00
NIIBE Yutaka	98977937cb	fix chx_wakeup	2016-05-16 18:00:41 +09:00
NIIBE Yutaka	06d046b963	Improve system routines API for STM32F103	2016-05-16 14:59:05 +09:00
NIIBE Yutaka	b7c6dadcfb	Fix IRQ handling and improve cancellation implementation	2016-05-16 14:50:04 +09:00
NIIBE Yutaka	a82acac8df	Bug fix for interrupt preemption	2016-05-13 22:27:56 +09:00
NIIBE Yutaka	206f2a5f07	Fix intr_wait	2016-05-13 17:51:12 +09:00
NIIBE Yutaka	5046dd45f2	IRQ handling is now merged into polling	2016-05-13 16:35:35 +09:00
NIIBE Yutaka	db6e668524	more fixes for chopstx_poll	2016-05-13 14:52:38 +09:00
NIIBE Yutaka	daa7aebd6f	Add READY field for chx_poll_XXX so that we can check if it's ready	2016-05-13 14:22:12 +09:00
NIIBE Yutaka	5fc2617ae5	Fix changelog	2016-05-13 11:11:01 +09:00
NIIBE Yutaka	fabd271196	Update example-cdc	2016-05-12 18:14:47 +09:00
NIIBE Yutaka	5730641ffd	Bug fixes for Cortex-M3 and chopstx_poll	2016-05-12 18:12:52 +09:00
NIIBE Yutaka	5c1638c023	Fix mutex init	2016-05-12 11:17:17 +09:00
NIIBE Yutaka	420bd135af	Adding ADC example for FS-BB48	2016-05-11 12:34:17 +09:00
NIIBE Yutaka	a538113c07	change poll behavior	2016-04-24 12:24:36 +09:00
NIIBE Yutaka	8668c8a88a	update sys.c in examples	2016-04-22 17:21:50 +09:00
NIIBE Yutaka	fba1dc05ea	Clean up FS-BB48 example	2016-04-22 17:21:29 +09:00
NIIBE Yutaka	1b12a78054	Modify chopstx_poll API	2016-04-22 13:42:01 +09:00
NIIBE Yutaka	5d40ffbffa	Implement chopstx_poll (2)	2016-04-21 16:10:06 +09:00
NIIBE Yutaka	06d28b62fb	Implement chopstx_poll	2016-04-21 15:59:34 +09:00
NIIBE Yutaka	437b2dc43c	Update for STM32	2016-04-20 17:30:41 +09:00
NIIBE Yutaka	3eac245981	fix	2016-04-19 16:40:25 +09:00
NIIBE Yutaka	7c2cdaa6e4	Example for FS-BB48 to compute CRC32.	2016-04-19 15:58:26 +09:00
NIIBE Yutaka	0bbb43dd3a	Fix USB driver and example	2016-04-18 17:23:10 +09:00
NIIBE Yutaka	82749ab97a	Add support for FS-BB48	2016-04-18 11:46:14 +09:00
NIIBE Yutaka	92e17d3bdf	USB stack for STM32F103 improvement	2016-04-07 14:52:39 +09:00
NIIBE Yutaka	674c19c495	SVC is required for Cortex-M3	2016-04-07 14:36:41 +09:00
NIIBE Yutaka	35426d7715	Fix MSP initial value and improve chx_sched	2016-04-07 09:59:13 +09:00
NIIBE Yutaka	6db2dd96c5	New function: chopstx_poll	2016-04-06 21:04:24 +09:00
NIIBE Yutaka	5e6a433457	New struct: chx_qh	2016-04-06 20:34:28 +09:00
NIIBE Yutaka	fa8dd7afc8	Don't use SVC for context switch	2016-04-06 19:49:18 +09:00
NIIBE Yutaka	8e40065311	Initialization of chx_spinlock	2016-04-05 19:27:25 +09:00
NIIBE Yutaka	a99c5c6048	fix struct NVIC	2016-04-05 19:17:44 +09:00
NIIBE Yutaka	e092a56c17	Fix USB GET	2016-03-15 10:31:16 +09:00
NIIBE Yutaka	25e5f21847	AAPCS stack alignment	2016-03-08 20:27:24 +09:00
NIIBE Yutaka	90ac7f7c13	update usb stack from Gnuk development branch	2016-03-08 20:20:49 +09:00
NIIBE Yutaka	fd8aee3cb0	CDC to be echo service.	2015-11-05 13:54:49 +09:00
				`@@ -0,0 +1 @@`
				`void cmd_dispatch (struct tty tty, const char line);`