Version 0.04a

.gitignore

@@ -1,7 +1,4 @@
-example-cdc/.dep
-example-cdc/board.h
-example-cdc/build
-example-led/.dep
-example-led/board.h
-example-led/build
+*/board.h
+*/build
+*/.dep
 doc/chopstx.info

ChangeLog

@@ -1,3 +1,93 @@
+2015-03-17  Niibe Yutaka  <gniibe@fsij.org>
+
+	* VERSION: 0.04a.
+
+2014-12-10  Niibe Yutaka  <gniibe@fsij.org>
+
+	* Version 0.04.
+	* doc/chopstx.texi (VERSION): 0.04.
+
+	* board/*.h: Updated.
+
+	* example-cdc/sys.c: Copied from example-led.
+
+	* example-led/sys.c (clock_init, GPIO_USB): Follow the change of
+	entry.c.
+	(gpio_init): Use RCC_ENR_IOP_EN and RCC_RSTR_IOP_RST.
+	(reset): Use ldr instead of mov.w and movt.
+
+	* entry.c (GPIO_USB) [GPIO_USB_BASE]: Conditionally defined.
+
+	* chopstx.c (preempt): Add ! for stm.
+	(chx_exit): Make sure RETVAL is saved onto r8.
+	(chopstx_usec_wait_var): Make sure USEC_P is saved onto r8.
+
+2013-11-27  Niibe Yutaka  <gniibe@fsij.org>
+
+	* board/board-stbee-mini.h: New.
+
+	* entry.c (AFIO_MAPR_SWJ_CFG_DISABLE): New.
+
+2013-11-26  Niibe Yutaka  <gniibe@fsij.org>
+
+	* board/board-stbee.h: New.
+
+	* rules.mk (OUTFILES) [ENABLE_OUTPUT_HEX]: Add hex generation.
+
+2013-11-21  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/usb_stm32f103.c, example-cdc/usb_lld.h: Update from
+	Gnuk.
+
+2013-11-08  Niibe Yutaka  <gniibe@fsij.org>
+
+	* Version 0.03.
+	* doc/chopstx.texi (VERSION): 0.03.
+
+	* chopstx.c (preempt): Disable interrupt.
+
+2013-11-08  Niibe Yutaka  <gniibe@fsij.org>
+
+	* Version 0.02.
+	* doc/chopstx.texi (VERSION): 0.02.
+
+	* example-cdc/usb_stm32f103.c: Updated from NeuG.
+
+	* chopstx.c (CPU_EXCEPTION_PRIORITY_SYSTICK): Equals to
+	CPU_EXCEPTION_PRIORITY_INTERRUPT.
+
+2013-11-03  Niibe Yutaka  <gniibe@fsij.org>
+
+	* Version 0.01.
+	* doc/chopstx.texi (VERSION): 0.01.
+
+	* chopstx.c (chx_clr_intr): New.
+	(chopstx_intr_wait): Call chopstx.c.
+	(chx_enable_intr): Let chx_clr_intr clear pending-bit.
+
+2013-11-02  Niibe Yutaka  <gniibe@fsij.org>
+
+	* example-cdc/usb_lld.h, example-cdc/usb_stm32f103.c: Update from
+	Gnuk.
+	* example-cdc/usb-cdc.c (usb_cb_get_descriptor): Follow the
+	change.
+
+	* example-cdc/sys.c, example-led/sys.c: Update from Gnuk.
+
+	* chopstx.c (CPU_EXCEPTION_PRIORITY_INTERRUPT)
+	(CPU_EXCEPTION_PRIORITY_PENDSV): Change the value, so that
+	interrupt priority matches USB interrupt priority of old SYS 1.0
+	implementation.
+	(chx_enable_intr, chx_disable_intr): Clear pending bit at
+	chx_enable_intr.
+	(chopstx_intr_wait): Call chx_enable_intr only when it's going to
+	sleep.
+	* entry.c (RCC_APB2RSTR_AFIORST, define RCC_APB2ENR_AFIOEN): New.
+	(AFIO, GPIO_OTHER): New.
+	(gpio_init): Handle AFIO and GPIO_OTHER.
+	* board/board-fst-01.h, board/board-stm8s-discovery.h: Add pin-cir
+	usage.
+
 2013-08-21  Niibe Yutaka  <gniibe@fsij.org>
 
 	* Version 0.00.

NEWS

@@ -0,0 +1,82 @@
+NEWS - Noteworthy changes
+
+* Major changes in Chopstx 0.04
+
+  Released 2014-12-10, by NIIBE Yutaka
+
+** new board.h macros and sys.c in example
+In board.h, RCC_APB2ENR_IOP_EN was renamed to RCC_ENR_IOP_EN and
+RCC_APB2RSTR_IOP_RST was renamed to RCC_RSTR_IOP_RST.  Example sys.c
+was changed accordingly.
+
+** Bug fix of chopstx_wakeup_usec_wait
+chopstx_usec_wait_var/chopstx_usec_wait won't be woken up
+by chopstx_wakeup_usec_wait.  This is now fixed in 0.04.
+
+** Board support STBee and STBee Mini
+The board STBee and STBee Mini are now supported.
+
+
+* Major changes in Chopstx 0.03
+
+  Released 2013-11-08, by NIIBE Yutaka
+
+** Bug fix of preemption
+In the implementation of preemption, there was a bug which might cause
+not to schedule proper thread.  This is because the routine preepmt
+itself might be interrupted.  This is now fixed in 0.03.
+
+
+* Major changes in Chopstx 0.02
+
+  Released 2013-11-08, by NIIBE Yutaka
+
+** Bug fix of priority
+There was a severe bug about the configuraion of priority setting of
+exceptions.  As we don't use any inter-lock between interrupts hander
+and timer expiration handler, these priorities should be equal.  If
+not, timer expiration handler might interrupt the execution of
+interrupts handers.
+
+
+* Major changes in Chopstx 0.01
+
+  Released 2013-11-03, by NIIBE Yutaka
+
+** Interrupt handling change
+There was a bug in 0.00, which caused spurious interrupts.  Every
+interrupt event caused two events.  Specifically, after valid
+interrupt event (for the caller of chopstx_intr_wait), another
+spurious event was always occurred.  This was fixed.
+
+In the design of Chopstx, interrupt handling is done by a thread.
+Lower level interrupt handler just accepts interrupt, disabling the
+interrupt, and switchs the control to the thread.  It is the thread to
+check the cause of interrupt, to process it, and to clear the cause.
+Next call to chopstx_intr_wait will enable the interrupt again.
+
+The bug was related to pending interrupt flag.  Pending interrupt flag
+for a specific interrupt is set, on return from handler mode if the
+cause is still active.  With traditional interrupt handling, lower
+level interrupt handler processes it and clears the cause.  Thus,
+pending interrupt flag is not set on return.
+
+In Chopstx, pending interrupt flag was always set, because the control
+goes from lower level interrupt handler (in handler mode) to a
+interrupt handling thread which processes the interrupt.  In 0.01, new
+internal routine chx_clr_intr is introduced, and pending interrupt
+flag is cleared within chopstx_intr_wait after waked up.
+
+For detail of interrupt operation, see the section B.3.4, Nested
+Vectored Interrupt Controller (NVIC), in the ARM v7-M Architecture
+Reference Manual.  The subsection, B3.4.1, Theory of operation,
+explains how it works.
+
+
+** gpio_init change
+Now, gpi_init support AFIO mapping and another GPIO (GPIO_OTHER)
+settings.
+
+Local Variables:
+mode: outline
+End:

README

@@ -1,6 +1,6 @@
 Chopstx - Threads and only Threads
-							Version 0.00
-							  2013-08-21
+							Version 0.04
+							  2014-12-10
 							Niibe Yutaka
 					     Flying Stone Technology
 
@@ -35,4 +35,13 @@ USB CDC-ACM function.  You can build it like:
    $ ln -s ../board/board-olimex-stm32-h103.h board.h
    $ make
 
+
+Future Works
+============
+
+We have a development branch for ARM Cortex-M0 and it works fine.
+It will be merged into mainline.
+
+Thread local storage and support of interface like poll/select would
+be next thing to be done.
 -- 

VERSION

@@ -0,0 +1 @@
+release/0.04a

board/board-fst-01-00.h

@@ -1,11 +1,11 @@
 #define FLASH_PAGE_SIZE 1024
 
-#define STM32_PLLXTPRE			STM32_PLLXTPRE_DIV1
-#define STM32_PLLMUL_VALUE		9
-#define STM32_HSECLK			8000000
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              9
+#define STM32_HSECLK                    8000000
 
-#define GPIO_USB_SET_TO_ENABLE		10
-#define GPIO_LED_SET_TO_EMIT		8
+#define GPIO_USB_SET_TO_ENABLE          10
+#define GPIO_LED_SET_TO_EMIT            8
 
 /*
  * Port A setup.
@@ -22,10 +22,10 @@
 #define VAL_GPIO_CRL            0x88888888      /*  PA7...PA0 */
 #define VAL_GPIO_CRH            0x88811383      /* PA15...PA8 */
 
-#define GPIO_USB_BASE	GPIOA_BASE
-#define GPIO_LED_BASE	GPIOA_BASE
+#define GPIO_USB_BASE   GPIOA_BASE
+#define GPIO_LED_BASE   GPIOA_BASE
 
-#define RCC_APB2ENR_IOP_EN	RCC_APB2ENR_IOPAEN
-#define RCC_APB2RSTR_IOP_RST	RCC_APB2RSTR_IOPARST
+#define RCC_ENR_IOP_EN      RCC_APB2ENR_IOPAEN
+#define RCC_RSTR_IOP_RST    RCC_APB2RSTR_IOPARST
 
 /* NeuG settings for ADC2 is default (PA0: Analog IN0, PA1: Analog IN1).  */

board/board-fst-01.h

@@ -1,11 +1,24 @@
 #define FLASH_PAGE_SIZE 1024
 
-#define STM32_PLLXTPRE			STM32_PLLXTPRE_DIV1
-#define STM32_PLLMUL_VALUE		6
-#define STM32_HSECLK			12000000
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              6
+#define STM32_HSECLK                    12000000
 
-#define GPIO_USB_SET_TO_ENABLE		10
-#define GPIO_LED_SET_TO_EMIT		0
+#define GPIO_USB_SET_TO_ENABLE          10
+#define GPIO_LED_SET_TO_EMIT            0
+
+/* 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
 
 /*
  * Port A setup.
@@ -42,11 +55,11 @@
 #define VAL_GPIO_LED_CRL            0x88888883      /*  PA7...PA0 */
 #define VAL_GPIO_LED_CRH            0x88888888      /* PA15...PA8 */
 
-#define GPIO_USB_BASE	GPIOA_BASE
-#define GPIO_LED_BASE	GPIOB_BASE
+#define GPIO_USB_BASE   GPIOA_BASE
+#define GPIO_LED_BASE   GPIOB_BASE
 
-#define RCC_APB2ENR_IOP_EN	(RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN)
-#define RCC_APB2RSTR_IOP_RST	(RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST)
+#define RCC_ENR_IOP_EN      (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN)
+#define RCC_RSTR_IOP_RST    (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST)
 
 /* NeuG settings for ADC2.  */
 #define NEUG_ADC_SETTING2_SMPR1 0

board/board-olimex-stm32-h103.h

@@ -1,11 +1,11 @@
 #define FLASH_PAGE_SIZE 1024
 
-#define STM32_PLLXTPRE			STM32_PLLXTPRE_DIV1
-#define STM32_PLLMUL_VALUE		9
-#define STM32_HSECLK			8000000
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              9
+#define STM32_HSECLK                    8000000
 
-#define GPIO_USB_CLEAR_TO_ENABLE	11
-#define GPIO_LED_CLEAR_TO_EMIT		12
+#define GPIO_USB_CLEAR_TO_ENABLE        11
+#define GPIO_LED_CLEAR_TO_EMIT          12
 
 /*
  * Port C setup.
@@ -22,11 +22,11 @@
 #define VAL_GPIO_CRL            0x44888888      /*  PC7...PC0 */
 #define VAL_GPIO_CRH            0x88837888      /* PC15...PC8 */
 
-#define GPIO_USB_BASE	GPIOC_BASE
-#define GPIO_LED_BASE	GPIOC_BASE
+#define GPIO_USB_BASE   GPIOC_BASE
+#define GPIO_LED_BASE   GPIOC_BASE
 
-#define RCC_APB2ENR_IOP_EN	RCC_APB2ENR_IOPCEN
-#define RCC_APB2RSTR_IOP_RST	RCC_APB2RSTR_IOPCRST
+#define RCC_ENR_IOP_EN      RCC_APB2ENR_IOPCEN
+#define RCC_RSTR_IOP_RST    RCC_APB2RSTR_IOPCRST
 
 /* NeuG settings for ADC2.  */
 #define NEUG_ADC_SETTING2_SMPR1 ADC_SMPR1_SMP_AN10(ADC_SAMPLE_1P5) \

board/board-stbee-mini.h

@@ -0,0 +1,115 @@
+#define FLASH_PAGE_SIZE 1024
+
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              6
+#define STM32_HSECLK                    12000000
+
+#define GPIO_USB_SET_TO_ENABLE          14
+#define GPIO_LED_CLEAR_TO_EMIT          13
+
+#if defined(PINPAD_CIR_SUPPORT) || defined(PINPAD_DIAL_SUPPORT)
+#define HAVE_7SEGLED	1
+/*
+ * Timer assignment for CIR
+ */
+#define TIMx                  TIM3
+#define INTR_REQ_TIM          TIM3_IRQ
+#define AFIO_EXTICR_INDEX     0
+#endif
+
+#if defined(PINPAD_CIR_SUPPORT)
+#define AFIO_EXTICR1_EXTIx_Py AFIO_EXTICR1_EXTI0_PB
+#define EXTI_PR               EXTI_PR_PR0
+#define EXTI_IMR              EXTI_IMR_MR0
+#define EXTI_FTSR_TR          EXTI_FTSR_TR0
+#define INTR_REQ_EXTI         EXTI0_IRQ
+#define RCC_APBnENR_TIMxEN    RCC_APB1ENR_TIM3EN
+#define RCC_APBnRSTR_TIMxRST  RCC_APB1RSTR_TIM3RST
+#elif defined(PINPAD_DIAL_SUPPORT)
+#define AFIO_EXTICR1_EXTIx_Py AFIO_EXTICR1_EXTI2_PB
+#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 RCC_APBnENR_TIMxEN    RCC_APB1ENR_TIM4EN
+#define RCC_APBnRSTR_TIMxRST  RCC_APB1RSTR_TIM4RST
+#endif
+#define ENABLE_RCC_APB1
+
+#if defined(PINPAD_CIR_SUPPORT) || defined(PINPAD_DIAL_SUPPORT)
+/*
+ * Port A setup.
+ * PA1  - Digital input with PullUp.  AN1 for NeuG
+ * PA2  - Digital input with PullUp.  AN2 for NeuG
+ * PA6  - (TIM3_CH1) input with pull-up
+ * PA7  - (TIM3_CH2) input with pull-down
+ * PA11 - Push Pull output 10MHz 0 default (until USB enabled) (USBDM)
+ * PA12 - Push Pull output 10MHz 0 default (until USB enabled) (USBDP)
+ * PA13 - Open Drain output (LED1 0:ON 1:OFF)
+ * PA14 - Push pull output  (USB ENABLE 0:DISABLE 1:ENABLE)
+ * PA15 - Open Drain output (LED2 0:ON 1:OFF)
+ */
+#define VAL_GPIO_ODR            0xFFFFE77F
+#define VAL_GPIO_CRL            0x88888888      /*  PA7...PA0 */
+#define VAL_GPIO_CRH            0x63611888      /* PA15...PA8 */
+
+/*
+ * Port B setup.
+ * PB0  - Push pull output   (LED 1:ON 0:OFF)
+ * ------------------------ Default
+ * PBx  - input with pull-up.
+ */
+#define VAL_GPIO_LED_ODR            0xFFFFFFFF
+#define VAL_GPIO_LED_CRL            0x88888888      /*  PB7...PB0 */
+#define VAL_GPIO_LED_CRH            0x66666666      /* PB15...PB8 */
+
+/* Port B setup. */
+#define GPIOB_CIR               0
+#define GPIOB_BUTTON            2
+#define GPIOB_ROT_A             6
+#define GPIOB_ROT_B             7
+
+#define GPIOB_7SEG_DP           15
+#define GPIOB_7SEG_A            14
+#define GPIOB_7SEG_B            13
+#define GPIOB_7SEG_C            12
+#define GPIOB_7SEG_D            11
+#define GPIOB_7SEG_E            10
+#define GPIOB_7SEG_F            9
+#define GPIOB_7SEG_G            8
+
+#define RCC_ENR_IOP_EN      \
+        (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_AFIOEN)
+#define RCC_RSTR_IOP_RST    \
+        (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST | RCC_APB2RSTR_AFIORST)
+#else
+/*
+ * Port A setup.
+ * PA1  - Digital input with PullUp.  AN1 for NeuG
+ * PA2  - Digital input with PullUp.  AN2 for NeuG
+ * PA11 - Push Pull output 10MHz 0 default (until USB enabled) (USBDM)
+ * PA12 - Push Pull output 10MHz 0 default (until USB enabled) (USBDP)
+ * PA13 - Open Drain output (LED1 0:ON 1:OFF)
+ * PA14 - Push pull output  (USB ENABLE 0:DISABLE 1:ENABLE)
+ * PA15 - Open Drain output (LED2 0:ON 1:OFF)
+ */
+#define VAL_GPIO_ODR            0xFFFFE7FF
+#define VAL_GPIO_CRL            0x88888888      /*  PA7...PA0 */
+#define VAL_GPIO_CRH            0x63611888      /* PA15...PA8 */
+
+#define RCC_ENR_IOP_EN      (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_AFIOEN)
+#define RCC_RSTR_IOP_RST    (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_AFIORST)
+#endif
+
+
+#define GPIO_USB_BASE           GPIOA_BASE
+#define GPIO_LED_BASE           GPIOA_BASE
+#define AFIO_MAPR_SOMETHING     AFIO_MAPR_SWJ_CFG_DISABLE
+
+/* NeuG settings for ADC2.  */
+#define NEUG_ADC_SETTING2_SMPR1 0
+#define NEUG_ADC_SETTING2_SMPR2 ADC_SMPR2_SMP_AN1(ADC_SAMPLE_1P5)    \
+                              | ADC_SMPR2_SMP_AN2(ADC_SAMPLE_1P5)
+#define NEUG_ADC_SETTING2_SQR3  ADC_SQR3_SQ1_N(ADC_CHANNEL_IN1)      \
+                              | ADC_SQR3_SQ2_N(ADC_CHANNEL_IN2)
+#define NEUG_ADC_SETTING2_NUM_CHANNELS 2

board/board-stbee.h

@@ -0,0 +1,42 @@
+#define FLASH_PAGE_SIZE 2048
+
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              6
+#define STM32_HSECLK                    12000000
+
+#define GPIO_USB_CLEAR_TO_ENABLE        3
+#define GPIO_LED_CLEAR_TO_EMIT          4
+
+/*
+ * Port A setup.
+ * PA0  - Normal input.
+ * PA11 - Push Pull output 10MHz 0 default (until USB enabled) (USBDM)
+ * PA12 - Push Pull output 10MHz 0 default (until USB enabled) (USBDP)
+ */
+#define VAL_GPIO_OTHER_ODR      0xFFFFE7FF
+#define VAL_GPIO_OTHER_CRL      0x88888884      /*  PA7...PA0 */
+#define VAL_GPIO_OTHER_CRH      0x88811888      /* PA15...PA8 */
+
+#define RCC_ENR_IOP_EN      (RCC_APB2ENR_IOPAEN|RCC_APB2ENR_IOPDEN)
+#define RCC_RSTR_IOP_RST    (RCC_APB2RSTR_IOPARST|RCC_APB2RSTR_IOPDRST)
+
+/*
+ * Port D setup.
+ * PD3  - Push pull output  (USB_DISC 1:USB-DISABLE 0:USB-ENABLE) 2MHz
+ * PD4  - Open Drain output 2MHz (LED1).
+ */
+#define VAL_GPIO_ODR            0xFFFFFFFF
+#define VAL_GPIO_CRL            0x88862888      /*  PD7...PD0 */
+#define VAL_GPIO_CRH            0x88888888      /* PD15...PD8 */
+
+#define GPIO_USB_BASE   GPIOD_BASE
+#define GPIO_LED_BASE   GPIOD_BASE
+#define GPIO_OTHER_BASE GPIOA_BASE
+
+/* NeuG settings for ADC2.  */
+#define NEUG_ADC_SETTING2_SMPR1 ADC_SMPR1_SMP_AN10(ADC_SAMPLE_1P5) \
+                              | ADC_SMPR1_SMP_AN11(ADC_SAMPLE_1P5)
+#define NEUG_ADC_SETTING2_SMPR2 0
+#define NEUG_ADC_SETTING2_SQR3  ADC_SQR3_SQ1_N(ADC_CHANNEL_IN10)   \
+                              | ADC_SQR3_SQ2_N(ADC_CHANNEL_IN11)
+#define NEUG_ADC_SETTING2_NUM_CHANNELS 2

board/board-stm8s-discovery.h

@@ -1,11 +1,26 @@
 #define FLASH_PAGE_SIZE 1024
 
-#define STM32_PLLXTPRE			STM32_PLLXTPRE_DIV1
-#define STM32_PLLMUL_VALUE		9
-#define STM32_HSECLK			8000000
+#define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
+#define STM32_PLLMUL_VALUE              9
+#define STM32_HSECLK                    8000000
 
 #undef  GPIO_USB_CLEAR_TO_ENABLE
-#define GPIO_LED_SET_TO_EMIT		8
+#define GPIO_LED_SET_TO_EMIT            8
+
+/* For pin-cir settings of Gnuk */
+#define TIMx                  TIM3
+#define INTR_REQ_TIM          TIM3_IRQ
+#define AFIO_EXTICR_INDEX     1
+#define AFIO_EXTICR1_EXTIx_Py AFIO_EXTICR2_EXTI5_PB
+#define EXTI_PR               EXTI_PR_PR5
+#define EXTI_IMR              EXTI_IMR_MR5
+#define EXTI_FTSR_TR          EXTI_FTSR_TR5
+#define INTR_REQ_EXTI         EXTI9_5_IRQ
+#define ENABLE_RCC_APB1
+#define RCC_APBnENR_TIMxEN    RCC_APB1ENR_TIM3EN
+#define RCC_APBnRSTR_TIMxRST  RCC_APB1RSTR_TIM3RST
+#define AFIO_MAPR_SOMETHING   AFIO_MAPR_TIM3_REMAP_PARTIALREMAP
+                              /* Remap (PB4, PB5) -> (TIM3_CH1, TIM3_CH2) */
 
 /*
  * Port A setup.
@@ -21,10 +36,24 @@
 #define VAL_GPIO_CRL            0x88888888      /*  PA7...PA0 */
 #define VAL_GPIO_CRH            0x88811881      /* PA15...PA8 */
 
-#define GPIO_USB_BASE	GPIOA_BASE
-#define GPIO_LED_BASE	GPIOA_BASE
+#define GPIO_USB_BASE   GPIOA_BASE
+#define GPIO_LED_BASE   GPIOA_BASE
 
-#define RCC_APB2ENR_IOP_EN	(RCC_APB2ENR_IOPAEN)
-#define RCC_APB2RSTR_IOP_RST	(RCC_APB2RSTR_IOPARST)
+#define RCC_ENR_IOP_EN   \
+  (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_AFIOEN)
+#define RCC_RSTR_IOP_RST \
+  (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST | RCC_APB2RSTR_AFIORST)
 
 /* NeuG settings for ADC2 is default (PA0: Analog IN0, PA1: Analog IN1).  */
+
+#define GPIO_OTHER_BASE GPIOB_BASE
+/*
+ * Port B setup.
+ * PB4  - (TIM3_CH1) input with pull-up
+ * PB5  - (TIM3_CH2) input with pull-up, connected to CIR module
+ * Everything input with pull-up except:
+ * PB0  - (TIM3_CH3) input with pull-down
+ */
+#define VAL_GPIO_OTHER_ODR 0xFFFFFFFE
+#define VAL_GPIO_OTHER_CRL 0x88888888      /*  PB7...PB0 */
+#define VAL_GPIO_OTHER_CRH 0x88888888      /* PB15...PB8 */

chopstx.c

@@ -1,7 +1,7 @@
 /*
  * chopstx.c - Threads and only threads.
  *
- * Copyright (C) 2013 Flying Stone Technology
+ * Copyright (C) 2013, 2014 Flying Stone Technology
  * Author: NIIBE Yutaka <gniibe@fsij.org>
  *
  * This file is a part of Chopstx, a thread library for embedded.
@@ -54,9 +54,9 @@
  * Prio 0x30: svc
  * ---------------------
  * Prio 0x40: thread temporarily inhibiting schedule for critical region
- * Prio 0x50: systick
- * Prio 0x60: external interrupt
- * Prio 0x70: pendsv
+ * ...
+ * Prio 0xb0: systick, external interrupt
+ * Prio 0xc0: pendsv
  */
 
 #define CPU_EXCEPTION_PRIORITY_CLEAR         0
@@ -64,9 +64,10 @@
 #define CPU_EXCEPTION_PRIORITY_SVC           0x30
 
 #define CPU_EXCEPTION_PRIORITY_INHIBIT_SCHED 0x40
-#define CPU_EXCEPTION_PRIORITY_SYSTICK       0x50
-#define CPU_EXCEPTION_PRIORITY_INTERRUPT     0x60
-#define CPU_EXCEPTION_PRIORITY_PENDSV        0x70
+/* ... */
+#define CPU_EXCEPTION_PRIORITY_SYSTICK       CPU_EXCEPTION_PRIORITY_INTERRUPT
+#define CPU_EXCEPTION_PRIORITY_INTERRUPT     0xb0
+#define CPU_EXCEPTION_PRIORITY_PENDSV        0xc0
 
 /**
  * chx_fatal - Fatal error point.
@@ -168,11 +169,11 @@ struct NVIC {
   uint32_t IPR[60];
 };
 
-static struct NVIC *const NVICBase = (struct NVIC *const)0xE000E100;
-#define NVIC_ISER(n)	(NVICBase->ISER[n >> 5])
-#define NVIC_ICER(n)	(NVICBase->ICER[n >> 5])
-#define NVIC_ICPR(n)	(NVICBase->ICPR[n >> 5])
-#define NVIC_IPR(n)	(NVICBase->IPR[n >> 2])
+static struct NVIC *const NVIC = (struct NVIC *const)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])
 
 #define USB_LP_CAN1_RX0_IRQn	 20
 
@@ -430,7 +431,9 @@ preempt (void)
 {
   register struct chx_thread *tp asm ("r0");
 
-  asm ("ldr	r1, =running\n\t"
+  tp = (struct chx_thread *)CPU_EXCEPTION_PRIORITY_INHIBIT_SCHED;
+  asm ("msr	BASEPRI, r0\n\t"
+       "ldr	r1, =running\n\t"
        "ldr	r0, [r1]\n\t"
        "cbnz	r0, 0f\n\t"
        /* It's idle which was preempted.  Discard saved registers on stack.  */
@@ -446,9 +449,9 @@ preempt (void)
        "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}"
+       "stm	r1!, {r2, r3, r4, r5, r6}"
        : "=r" (tp)
-       : /* no input */
+       : "r" (tp)
        : "r1", "r2", "r3", "r4", "r5", "r6", "cc", "memory");
 
   if (tp)
@@ -499,7 +502,7 @@ svc (void)
        "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"
+       "stm	r1!, {r2, r3, r4, r5, r6}\n\t"
        "ldr	r1, [r6]"
        : "=r" (tp), "=r" (orig_r0)
        : /* no input */
@@ -643,12 +646,16 @@ 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);
-  /* Clear pending, too.  */
-  NVIC_ICPR (irq_num) = 1 << (irq_num & 0x1f);
 }
 
 
@@ -770,9 +777,11 @@ chx_sched (uint32_t arg)
 static void __attribute__((noreturn))
 chx_exit (void *retval)
 {
-  register uint32_t r8 asm ("r8") = (uint32_t)retval;
+  register uint32_t r8 asm ("r8");
   struct chx_thread *q;
 
+  asm volatile ("mov	%0, %1" : "=r" (r8) : "r" (retval));
+
   chx_cpu_sched_lock ();
   if (running->flag_join_req)
     {		       /* wake up a thread which requests to join */
@@ -910,14 +919,16 @@ chopstx_create (uint32_t flags_and_prio,
 void
 chopstx_usec_wait_var (uint32_t *var)
 {
-  register uint32_t *usec_p asm ("r8") = var;
+  register uint32_t *r8 asm ("r8");
+  uint32_t *usec_p = var;
   uint32_t usec;
   uint32_t usec0 = 0;
 
+  asm volatile ("mov	%0, %1" : "=r" (r8) : "r" (usec_p));
   while (1)
     {
       chx_cpu_sched_lock ();
-      if (!usec_p)		/* awakened */
+      if (!r8)		/* awakened */
 	break;
       *usec_p -= usec0;
       usec = *usec_p;
@@ -930,8 +941,9 @@ chopstx_usec_wait_var (uint32_t *var)
       running->state = THREAD_WAIT_TIME;
       chx_timer_insert (running, usec0);
       chx_spin_unlock (&q_timer.lock);
+      asm volatile ("mov	%0, %1" : "=r" (r8) : "r" (usec_p));
       chx_sched (CHX_SLEEP);
-      asm ("" : "=r" (usec_p) : "r" (usec_p));
+      asm ("" : "=r" (r8) : "r" (r8));
     }
 
   chx_cpu_sched_unlock ();
@@ -1244,14 +1256,15 @@ void
 chopstx_intr_wait (chopstx_intr_t *intr)
 {
   chx_cpu_sched_lock ();
-  chx_enable_intr (intr->irq_num);
   if (intr->ready == 0)
     {
+      chx_enable_intr (intr->irq_num);
       if (running->flag_sched_rr)
 	chx_timer_dequeue (running);
       running->state = THREAD_WAIT_INT;
       running->v = 0;
       chx_sched (CHX_SLEEP);
+      chx_clr_intr (intr->irq_num);
     }
   else
     chx_cpu_sched_unlock ();

doc/chopstx.texi

@@ -1,7 +1,7 @@
 \input texinfo                      @c -*-texinfo-*-
 @c %**start of header
 @setfilename chopstx.info
-@set VERSION 0.00
+@set VERSION 0.04
 @settitle Chopstx Reference Manual
 @c Unify some of the indices.
 @syncodeindex tp fn

entry.c

@@ -1,7 +1,7 @@
 /*
  * entry.c - Entry routine when reset and interrupt vectors.
  *
- * Copyright (C) 2013 Flying Stone Technology
+ * Copyright (C) 2013, 2014 Flying Stone Technology
  * Author: NIIBE Yutaka <gniibe@fsij.org>
  *
  * This file is a part of Chopstx, a thread library for embedded.
@@ -33,10 +33,13 @@
 #ifdef HAVE_SYS_H
 #define INLINE __attribute__ ((used))
 #include "sys.h"
+#include "board.h"
 #else
 #include "board.h"
 
+#define STM32_SW_HSI		(0 << 0)
 #define STM32_SW_PLL		(2 << 0)
+#define STM32_PLLSRC_HSI	(0 << 16)
 #define STM32_PLLSRC_HSE	(1 << 16)
 
 #define STM32_PLLXTPRE_DIV1	(0 << 17)
@@ -44,6 +47,7 @@
 
 #define STM32_HPRE_DIV1		(0 << 4)
 
+#define STM32_PPRE1_DIV1	(0 << 8)
 #define STM32_PPRE1_DIV2	(4 << 8)
 
 #define STM32_PPRE2_DIV1        (0 << 11)
@@ -56,26 +60,29 @@
 
 #define STM32_MCO_NOCLOCK	(0 << 24)
 
-#define STM32_SW		STM32_SW_PLL
-#define STM32_PLLSRC		STM32_PLLSRC_HSE
-#define STM32_HPRE		STM32_HPRE_DIV1
 #define STM32_PPRE1		STM32_PPRE1_DIV2
+#define STM32_PLLSRC		STM32_PLLSRC_HSE
+#define STM32_FLASHBITS		0x00000012
+#define STM32_PLLCLKIN		(STM32_HSECLK / 1)
+
+#define STM32_SW		STM32_SW_PLL
+#define STM32_HPRE		STM32_HPRE_DIV1
 #define STM32_PPRE2		STM32_PPRE2_DIV1
 #define STM32_ADCPRE		STM32_ADCPRE_DIV6
 #define STM32_MCOSEL		STM32_MCO_NOCLOCK
 #define STM32_USBPRE            STM32_USBPRE_DIV1P5
 
-#define STM32_PLLCLKIN		(STM32_HSECLK / 1)
 #define STM32_PLLMUL		((STM32_PLLMUL_VALUE - 2) << 18)
 #define STM32_PLLCLKOUT		(STM32_PLLCLKIN * STM32_PLLMUL_VALUE)
 #define STM32_SYSCLK		STM32_PLLCLKOUT
 #define STM32_HCLK		(STM32_SYSCLK / 1)
 
-#define STM32_FLASHBITS		0x00000012
 
 #define PERIPH_BASE	0x40000000
+#define APBPERIPH_BASE   PERIPH_BASE
 #define APB2PERIPH_BASE	(PERIPH_BASE + 0x10000)
 #define AHBPERIPH_BASE	(PERIPH_BASE + 0x20000)
+#define AHB2PERIPH_BASE	(PERIPH_BASE + 0x08000000)
 
 struct RCC {
   volatile uint32_t CR;
@@ -109,6 +116,18 @@ static struct RCC *const RCC = ((struct RCC *const)RCC_BASE);
 
 #define RCC_AHBENR_CRCEN        0x0040
 
+#define RCC_APB2RSTR_AFIORST	0x00000001
+#define RCC_APB2RSTR_IOPARST	0x00000004
+#define RCC_APB2RSTR_IOPBRST	0x00000008
+#define RCC_APB2RSTR_IOPCRST	0x00000010
+#define RCC_APB2RSTR_IOPDRST	0x00000020
+
+#define RCC_APB2ENR_AFIOEN	0x00000001
+#define RCC_APB2ENR_IOPAEN	0x00000004
+#define RCC_APB2ENR_IOPBEN	0x00000008
+#define RCC_APB2ENR_IOPCEN	0x00000010
+#define RCC_APB2ENR_IOPDEN	0x00000020
+
 struct FLASH {
   volatile uint32_t ACR;
   volatile uint32_t KEYR;
@@ -131,7 +150,8 @@ clock_init (void)
   RCC->CR |= RCC_CR_HSION;
   while (!(RCC->CR & RCC_CR_HSIRDY))
     ;
-  RCC->CR &= RCC_CR_HSITRIM | RCC_CR_HSION;
+  /* Reset HSEON, HSEBYP, CSSON, and PLLON, not touching RCC_CR_HSITRIM */
+  RCC->CR &= (RCC_CR_HSITRIM | RCC_CR_HSION);
   RCC->CFGR = 0;
   while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI)
     ;
@@ -151,6 +171,10 @@ clock_init (void)
   RCC->CFGR = STM32_MCOSEL | STM32_USBPRE | STM32_PLLMUL | STM32_PLLXTPRE
     | STM32_PLLSRC | STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE;
 
+  /*
+   * We don't touch RCC->CR2, RCC->CFGR2, RCC->CFGR3, and RCC->CIR.
+   */
+
   /* Flash setup */
   FLASH->ACR = STM32_FLASHBITS;
 
@@ -163,14 +187,21 @@ clock_init (void)
     ;
 }
 
-#define RCC_APB2ENR_IOPAEN	0x00000004
-#define RCC_APB2RSTR_IOPARST	0x00000004
-#define RCC_APB2ENR_IOPBEN	0x00000008
-#define RCC_APB2RSTR_IOPBRST	0x00000008
-#define RCC_APB2ENR_IOPCEN	0x00000010
-#define RCC_APB2RSTR_IOPCRST	0x00000010
-#define RCC_APB2ENR_IOPDEN	0x00000020
-#define RCC_APB2RSTR_IOPDRST	0x00000020
+
+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 *const)AFIO_BASE;
+
+#define AFIO_MAPR_TIM3_REMAP_PARTIALREMAP 0x00000800
+#define AFIO_MAPR_SWJ_CFG_DISABLE         0x04000000
 
 
 struct GPIO {
@@ -194,17 +225,26 @@ struct GPIO {
 #define GPIOE_BASE	(APB2PERIPH_BASE + 0x1800)
 #define GPIOE		((struct GPIO *) GPIOE_BASE)
 
-static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
 static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
+#ifdef GPIO_USB_BASE
+static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
+#endif
+#ifdef GPIO_OTHER_BASE
+static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
+#endif
 
 static void __attribute__((used))
 gpio_init (void)
 {
   /* Enable GPIO clock. */
-  RCC->APB2ENR |= RCC_APB2ENR_IOP_EN;
-  RCC->APB2RSTR = RCC_APB2RSTR_IOP_RST;
+  RCC->APB2ENR |= RCC_ENR_IOP_EN;
+  RCC->APB2RSTR = RCC_RSTR_IOP_RST;
   RCC->APB2RSTR = 0;
 
+#ifdef AFIO_MAPR_SOMETHING
+  AFIO->MAPR |= AFIO_MAPR_SOMETHING;
+#endif
+
   GPIO_USB->ODR = VAL_GPIO_ODR;
   GPIO_USB->CRH = VAL_GPIO_CRH;
   GPIO_USB->CRL = VAL_GPIO_CRL;
@@ -214,10 +254,22 @@ gpio_init (void)
   GPIO_LED->CRH = VAL_GPIO_LED_CRH;
   GPIO_LED->CRL = VAL_GPIO_LED_CRL;
 #endif
+
+#ifdef GPIO_OTHER_BASE
+  GPIO_OTHER->ODR = VAL_GPIO_OTHER_ODR;
+  GPIO_OTHER->CRH = VAL_GPIO_OTHER_CRH;
+  GPIO_OTHER->CRL = VAL_GPIO_OTHER_CRL;
+#endif
 }
 #endif
 
 
+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);
+
 static void nmi (void)
 {
   for (;;);
@@ -302,12 +354,6 @@ void entry (void)
 
 
 typedef void (*handler)(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);
 
 handler vector_table[] __attribute__ ((section(".startup.vectors"))) = {
   (handler)&__main_stack_end__,

example-cdc/sys.c

@@ -1,7 +1,7 @@
 /*
  * sys.c - system routines for the initial page for STM32F103.
  *
- * Copyright (C) 2013 Flying Stone Technology
+ * Copyright (C) 2013, 2014 Flying Stone Technology
  * Author: NIIBE Yutaka <gniibe@fsij.org>
  *
  * Copying and distribution of this file, with or without modification,
@@ -24,7 +24,9 @@
 #define STM32_USB_IRQ_PRIORITY   11
 
 
+#define STM32_SW_HSI		(0 << 0)
 #define STM32_SW_PLL		(2 << 0)
+#define STM32_PLLSRC_HSI	(0 << 16)
 #define STM32_PLLSRC_HSE	(1 << 16)
 
 #define STM32_PLLXTPRE_DIV1	(0 << 17)
@@ -32,6 +34,7 @@
 
 #define STM32_HPRE_DIV1		(0 << 4)
 
+#define STM32_PPRE1_DIV1	(0 << 8)
 #define STM32_PPRE1_DIV2	(4 << 8)
 
 #define STM32_PPRE2_DIV1        (0 << 11)
@@ -44,23 +47,23 @@
 
 #define STM32_MCO_NOCLOCK	(0 << 24)
 
-#define STM32_SW		STM32_SW_PLL
-#define STM32_PLLSRC		STM32_PLLSRC_HSE
-#define STM32_HPRE		STM32_HPRE_DIV1
 #define STM32_PPRE1		STM32_PPRE1_DIV2
+#define STM32_PLLSRC		STM32_PLLSRC_HSE
+#define STM32_FLASHBITS		0x00000012
+#define STM32_PLLCLKIN		(STM32_HSECLK / 1)
+
+#define STM32_SW		STM32_SW_PLL
+#define STM32_HPRE		STM32_HPRE_DIV1
 #define STM32_PPRE2		STM32_PPRE2_DIV1
 #define STM32_ADCPRE		STM32_ADCPRE_DIV6
 #define STM32_MCOSEL		STM32_MCO_NOCLOCK
 #define STM32_USBPRE            STM32_USBPRE_DIV1P5
 
-#define STM32_PLLCLKIN		(STM32_HSECLK / 1)
 #define STM32_PLLMUL		((STM32_PLLMUL_VALUE - 2) << 18)
 #define STM32_PLLCLKOUT		(STM32_PLLCLKIN * STM32_PLLMUL_VALUE)
 #define STM32_SYSCLK		STM32_PLLCLKOUT
 #define STM32_HCLK		(STM32_SYSCLK / 1)
 
-#define STM32_FLASHBITS		0x00000012
-
 struct NVIC {
   uint32_t ISER[8];
   uint32_t unused1[24];
@@ -92,8 +95,10 @@ nvic_enable_vector (uint32_t n, uint32_t prio)
 
 
 #define PERIPH_BASE	0x40000000
+#define APBPERIPH_BASE   PERIPH_BASE
 #define APB2PERIPH_BASE	(PERIPH_BASE + 0x10000)
 #define AHBPERIPH_BASE	(PERIPH_BASE + 0x20000)
+#define AHB2PERIPH_BASE	(PERIPH_BASE + 0x08000000)
 
 struct RCC {
   volatile uint32_t CR;
@@ -127,6 +132,18 @@ static struct RCC *const RCC = ((struct RCC *const)RCC_BASE);
 
 #define RCC_AHBENR_CRCEN        0x0040
 
+#define RCC_APB2RSTR_AFIORST	0x00000001
+#define RCC_APB2RSTR_IOPARST	0x00000004
+#define RCC_APB2RSTR_IOPBRST	0x00000008
+#define RCC_APB2RSTR_IOPCRST	0x00000010
+#define RCC_APB2RSTR_IOPDRST	0x00000020
+
+#define RCC_APB2ENR_AFIOEN	0x00000001
+#define RCC_APB2ENR_IOPAEN	0x00000004
+#define RCC_APB2ENR_IOPBEN	0x00000008
+#define RCC_APB2ENR_IOPCEN	0x00000010
+#define RCC_APB2ENR_IOPDEN	0x00000020
+
 struct FLASH {
   volatile uint32_t ACR;
   volatile uint32_t KEYR;
@@ -149,7 +166,8 @@ clock_init (void)
   RCC->CR |= RCC_CR_HSION;
   while (!(RCC->CR & RCC_CR_HSIRDY))
     ;
-  RCC->CR &= RCC_CR_HSITRIM | RCC_CR_HSION;
+  /* Reset HSEON, HSEBYP, CSSON, and PLLON, not touching RCC_CR_HSITRIM */
+  RCC->CR &= (RCC_CR_HSITRIM | RCC_CR_HSION);
   RCC->CFGR = 0;
   while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI)
     ;
@@ -169,6 +187,10 @@ clock_init (void)
   RCC->CFGR = STM32_MCOSEL | STM32_USBPRE | STM32_PLLMUL | STM32_PLLXTPRE
     | STM32_PLLSRC | STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE;
 
+  /*
+   * We don't touch RCC->CR2, RCC->CFGR2, RCC->CFGR3, and RCC->CIR.
+   */
+
   /* Flash setup */
   FLASH->ACR = STM32_FLASHBITS;
 
@@ -181,14 +203,21 @@ clock_init (void)
     ;
 }
 
-#define RCC_APB2ENR_IOPAEN	0x00000004
-#define RCC_APB2RSTR_IOPARST	0x00000004
-#define RCC_APB2ENR_IOPBEN	0x00000008
-#define RCC_APB2RSTR_IOPBRST	0x00000008
-#define RCC_APB2ENR_IOPCEN	0x00000010
-#define RCC_APB2RSTR_IOPCRST	0x00000010
-#define RCC_APB2ENR_IOPDEN	0x00000020
-#define RCC_APB2RSTR_IOPDRST	0x00000020
+
+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 *const)AFIO_BASE;
+
+#define AFIO_MAPR_TIM3_REMAP_PARTIALREMAP 0x00000800
+#define AFIO_MAPR_SWJ_CFG_DISABLE         0x04000000
 
 
 struct GPIO {
@@ -212,17 +241,26 @@ struct GPIO {
 #define GPIOE_BASE	(APB2PERIPH_BASE + 0x1800)
 #define GPIOE		((struct GPIO *) GPIOE_BASE)
 
-static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
 static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
+#ifdef GPIO_USB_BASE
+static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
+#endif
+#ifdef GPIO_OTHER_BASE
+static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
+#endif
 
 static void
 gpio_init (void)
 {
   /* Enable GPIO clock. */
-  RCC->APB2ENR |= RCC_APB2ENR_IOP_EN;
-  RCC->APB2RSTR = RCC_APB2RSTR_IOP_RST;
+  RCC->APB2ENR |= RCC_ENR_IOP_EN;
+  RCC->APB2RSTR = RCC_RSTR_IOP_RST;
   RCC->APB2RSTR = 0;
 
+#ifdef AFIO_MAPR_SOMETHING
+  AFIO->MAPR |= AFIO_MAPR_SOMETHING;
+#endif
+
   GPIO_USB->ODR = VAL_GPIO_ODR;
   GPIO_USB->CRH = VAL_GPIO_CRH;
   GPIO_USB->CRL = VAL_GPIO_CRL;
@@ -232,6 +270,12 @@ gpio_init (void)
   GPIO_LED->CRH = VAL_GPIO_LED_CRH;
   GPIO_LED->CRL = VAL_GPIO_LED_CRL;
 #endif
+
+#ifdef GPIO_OTHER_BASE
+  GPIO_OTHER->ODR = VAL_GPIO_OTHER_ODR;
+  GPIO_OTHER->CRH = VAL_GPIO_OTHER_CRH;
+  GPIO_OTHER->CRL = VAL_GPIO_OTHER_CRL;
+#endif
 }
 
 static void
@@ -276,8 +320,6 @@ static void wait (int count)
     asm volatile ("" : : "r" (i) : "memory");
 }
 
-#define USB_IRQ 20
-#define USB_IRQ_PRIORITY ((11) << 4)
 
 static void
 usb_lld_sys_shutdown (void)
@@ -548,10 +590,13 @@ 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. */
-		"mov.w	r0, #0xed00\n\t" /* r0 = SCR */
-		"movt	r0, #0xe000\n\t"
-		"mov	r1, pc\n\t"	 /* r1 = (PC + 0x1000) & ~0x0fff */
+		"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"
@@ -560,7 +605,9 @@ reset (void)
 		"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"
+		"bx	r0\n\t"
+		".align	2\n"
+	"1:	.word	0xe000ed00"
 		: /* no output */ : /* no input */ : "memory");
 
   /* Never reach here. */

example-cdc/usb-cdc.c

@@ -253,9 +253,13 @@ usb_cb_setup (uint8_t req, uint8_t req_no,
 }
 
 int
-usb_cb_get_descriptor (uint8_t desc_type, uint16_t index, uint16_t value)
+usb_cb_get_descriptor (uint8_t rcp, uint8_t desc_type, uint8_t desc_index,
+		       uint16_t index)
 {
   (void)index;
+  if (rcp != DEVICE_RECIPIENT)
+    return USB_UNSUPPORT;
+
   if (desc_type == DEVICE_DESCRIPTOR)
     {
       usb_lld_set_data_to_send (vcom_device_desc, sizeof (vcom_device_desc));
@@ -269,7 +273,6 @@ usb_cb_get_descriptor (uint8_t desc_type, uint16_t index, uint16_t value)
     }
   else if (desc_type == STRING_DESCRIPTOR)
     {
-      uint8_t desc_index = value & 0xff;
       const uint8_t *str;
       int size;
 

example-cdc/usb_lld.h

@@ -60,7 +60,8 @@ void usb_cb_ctrl_write_finish (uint8_t req, uint8_t req_no,
 			       uint16_t value, uint16_t index, uint16_t len);
 int usb_cb_setup (uint8_t req, uint8_t req_no, uint16_t value,
 		  uint16_t index, uint16_t len);
-int usb_cb_get_descriptor (uint8_t desc_type, uint16_t index, uint16_t value);
+int usb_cb_get_descriptor (uint8_t rcp, uint8_t desc_type, uint8_t desc_index,
+			   uint16_t index);
 int usb_cb_handle_event (uint8_t event_type, uint16_t value);
 int usb_cb_interface (uint8_t cmd, uint16_t interface, uint16_t value);
 
@@ -88,9 +89,6 @@ enum DEVICE_STATE
   CONFIGURED
 };
 
-extern const uint8_t usb_initial_feature;
-
-#define STM32_USB_IRQ_PRIORITY     11
 
 extern void usb_lld_init (uint8_t feature);
 

example-cdc/usb_stm32f103.c

@@ -93,8 +93,8 @@ static struct DATA_INFO *const data_p = &data_info;
 /* Buffer Table address register */
 #define BTABLE  ((volatile uint16_t *)(REG_BASE + 0x50))
 
-#define ISTR_CTR    (0x8000) /* Correct TRansfer (clear-only bit) */
-#define ISTR_DOVR   (0x4000) /* DMA OVeR/underrun (clear-only bit) */
+#define ISTR_CTR    (0x8000) /* Correct TRansfer (read-only bit) */
+#define ISTR_OVR    (0x4000) /* OVeR/underrun (clear-only bit) */
 #define ISTR_ERR    (0x2000) /* ERRor (clear-only bit) */
 #define ISTR_WKUP   (0x1000) /* WaKe UP (clear-only bit) */
 #define ISTR_SUSP   (0x0800) /* SUSPend (clear-only bit) */
@@ -105,8 +105,7 @@ static struct DATA_INFO *const data_p = &data_info;
 #define ISTR_DIR    (0x0010)  /* DIRection of transaction (read-only bit)  */
 #define ISTR_EP_ID  (0x000F)  /* EndPoint IDentifier (read-only bit)  */
 
-#define CLR_CTR    (~ISTR_CTR)   /* clear Correct TRansfer bit */
-#define CLR_DOVR   (~ISTR_DOVR)  /* clear DMA OVeR/underrun bit*/
+#define CLR_OVR    (~ISTR_OVR)   /* clear OVeR/underrun bit*/
 #define CLR_ERR    (~ISTR_ERR)   /* clear ERRor bit */
 #define CLR_WKUP   (~ISTR_WKUP)  /* clear WaKe UP bit     */
 #define CLR_SUSP   (~ISTR_SUSP)  /* clear SUSPend bit     */
@@ -115,7 +114,7 @@ static struct DATA_INFO *const data_p = &data_info;
 #define CLR_ESOF   (~ISTR_ESOF)  /* clear Expected Start Of Frame bit */
 
 #define CNTR_CTRM   (0x8000) /* Correct TRansfer Mask */
-#define CNTR_DOVRM  (0x4000) /* DMA OVeR/underrun Mask */
+#define CNTR_OVRM   (0x4000) /* OVeR/underrun Mask */
 #define CNTR_ERRM   (0x2000) /* ERRor Mask */
 #define CNTR_WKUPM  (0x1000) /* WaKe UP Mask */
 #define CNTR_SUSPM  (0x0800) /* SUSPend Mask */
@@ -161,7 +160,7 @@ static struct DATA_INFO *const data_p = &data_info;
 #define EPRX_DTOG1     (0x1000) /* EndPoint RX Data TOGgle bit1 */
 #define EPRX_DTOG2     (0x2000) /* EndPoint RX Data TOGgle bit1 */
 
-static void usb_handle_transfer (void);
+static void usb_handle_transfer (uint16_t istr_value);
 
 static void st103_set_btable (void)
 {
@@ -391,20 +390,22 @@ usb_interrupt_handler (void)
 {
   uint16_t istr_value = st103_get_istr ();
 
-  if (istr_value & ISTR_CTR)
-    usb_handle_transfer ();
-
-  if (istr_value & ISTR_RESET)
+  if ((istr_value & ISTR_RESET))
     {
       st103_set_istr (CLR_RESET);
       usb_cb_device_reset ();
     }
+  else
+    {
+      if ((istr_value & ISTR_OVR))
+	st103_set_istr (CLR_OVR);
 
-  if (istr_value & ISTR_DOVR)
-    st103_set_istr (CLR_DOVR);
+      if ((istr_value & ISTR_ERR))
+	st103_set_istr (CLR_ERR);
 
-  if (istr_value & ISTR_ERR)
-    st103_set_istr (CLR_ERR);
+      if ((istr_value & ISTR_CTR))
+	usb_handle_transfer (istr_value);
+    }
 }
 
 static void handle_datastage_out (void)
@@ -539,7 +540,7 @@ static int std_get_status (uint8_t req,
       uint8_t endpoint = (index & 0x0f);
       uint16_t status;
 
-      if ((index & 0x70) != 0 || endpoint == ENDP0)
+      if ((index & 0x70) || endpoint == ENDP0)
 	return USB_UNSUPPORT;
 
       if ((index & 0x80))
@@ -697,10 +698,7 @@ static int std_get_descriptor (uint8_t req, uint16_t value,
     return USB_UNSUPPORT;
 
   (void)length;
-  if (rcp == DEVICE_RECIPIENT)
-    return usb_cb_get_descriptor ((value >> 8), index, value);
-
-  return USB_UNSUPPORT;
+  return usb_cb_get_descriptor (rcp, (value >> 8), (value & 0xff), index);
 }
 
 static int std_get_configuration (uint8_t req, uint16_t value,
@@ -935,80 +933,66 @@ void WEAK EP6_OUT_Callback (void);
 void WEAK EP7_OUT_Callback (void);
 
 static void
-usb_handle_transfer (void)
+usb_handle_transfer (uint16_t istr_value)
 {
   uint16_t ep_value = 0;
-  uint16_t istr_value;
   uint8_t ep_index;
 
-  while (((istr_value = st103_get_istr ()) & ISTR_CTR) != 0)
+  ep_index = (istr_value & ISTR_EP_ID);
+  /* Decode and service non control endpoints interrupt  */
+  /* process related endpoint register */
+  ep_value = st103_get_epreg (ep_index);
+
+  if (ep_index == 0)
     {
-      ep_index = (istr_value & ISTR_EP_ID);
-      if (ep_index == 0)
+      if ((ep_value & EP_CTR_TX))
 	{
-	  if ((istr_value & ISTR_DIR) == 0)
-	    {				/* DIR = 0 */
-	      /* DIR = 0      => IN  int */
-	      /* DIR = 0 implies that (EP_CTR_TX = 1) always  */
-
-	      st103_ep_clear_ctr_tx (ENDP0);
-	      handle_in0 ();
-	    }
-	  else
-	    {				/* DIR = 1 */
-	      /* DIR = 1 & CTR_RX       => SETUP or OUT int */
-	      /* DIR = 1 & (CTR_TX | CTR_RX) => 2 int pending */
-
-	      ep_value = st103_get_epreg (ENDP0);
-	      if ((ep_value & EP_SETUP) != 0)
-		{
-		  st103_ep_clear_ctr_rx (ENDP0);
-		  handle_setup0 ();
-		}
-	      else if ((ep_value & EP_CTR_RX) != 0)
-		{
-		  st103_ep_clear_ctr_rx (ENDP0);
-		  handle_out0 ();
-		}
-	    }
-
-	  if (dev_p->state == STALLED)
-	    st103_ep_set_rxtx_status (ENDP0, EP_RX_STALL, EP_TX_STALL);
+	  st103_ep_clear_ctr_tx (ep_index);
+	  handle_in0 ();
 	}
-      else
+
+      if ((ep_value & EP_CTR_RX))
 	{
-	  /* Decode and service non control endpoints interrupt  */
-	  /* process related endpoint register */
-	  ep_value = st103_get_epreg (ep_index);
+	  st103_ep_clear_ctr_rx (ep_index);
 
-	  if ((ep_value & EP_CTR_RX) != 0)
+	  if ((ep_value & EP_SETUP))
+	    handle_setup0 ();
+	  else
+	    handle_out0 ();
+	}
+
+      if (dev_p->state == STALLED)
+	st103_ep_set_rxtx_status (ENDP0, EP_RX_STALL, EP_TX_STALL);
+    }
+  else
+    {
+      if ((ep_value & EP_CTR_RX))
+	{
+	  st103_ep_clear_ctr_rx (ep_index);
+	  switch ((ep_index - 1))
 	    {
-	      st103_ep_clear_ctr_rx (ep_index);
-	      switch ((ep_index - 1))
-		{
-		case 0: EP1_OUT_Callback ();  break;
-		case 1: EP2_OUT_Callback ();  break;
-		case 2: EP3_OUT_Callback ();  break;
-		case 3: EP4_OUT_Callback ();  break;
-		case 4: EP5_OUT_Callback ();  break;
-		case 5: EP6_OUT_Callback ();  break;
-		case 6: EP7_OUT_Callback ();  break;
-		}
+	    case 0: EP1_OUT_Callback ();  break;
+	    case 1: EP2_OUT_Callback ();  break;
+	    case 2: EP3_OUT_Callback ();  break;
+	    case 3: EP4_OUT_Callback ();  break;
+	    case 4: EP5_OUT_Callback ();  break;
+	    case 5: EP6_OUT_Callback ();  break;
+	    case 6: EP7_OUT_Callback ();  break;
 	    }
+	}
 
-	  if ((ep_value & EP_CTR_TX) != 0)
+      if ((ep_value & EP_CTR_TX))
+	{
+	  st103_ep_clear_ctr_tx (ep_index);
+	  switch ((ep_index - 1))
 	    {
-	      st103_ep_clear_ctr_tx (ep_index);
-	      switch ((ep_index - 1))
-		{
-		case 0: EP1_IN_Callback ();  break;
-		case 1: EP2_IN_Callback ();  break;
-		case 2: EP3_IN_Callback ();  break;
-		case 3: EP4_IN_Callback ();  break;
-		case 4: EP5_IN_Callback ();  break;
-		case 5: EP6_IN_Callback ();  break;
-		case 6: EP7_IN_Callback ();  break;
-		}
+	    case 0: EP1_IN_Callback ();  break;
+	    case 1: EP2_IN_Callback ();  break;
+	    case 2: EP3_IN_Callback ();  break;
+	    case 3: EP4_IN_Callback ();  break;
+	    case 4: EP5_IN_Callback ();  break;
+	    case 5: EP6_IN_Callback ();  break;
+	    case 6: EP7_IN_Callback ();  break;
 	    }
 	}
     }

example-led/sys.c

@@ -1,7 +1,7 @@
 /*
  * sys.c - system routines for the initial page for STM32F103.
  *
- * Copyright (C) 2013 Flying Stone Technology
+ * Copyright (C) 2013, 2014 Flying Stone Technology
  * Author: NIIBE Yutaka <gniibe@fsij.org>
  *
  * Copying and distribution of this file, with or without modification,
@@ -24,7 +24,9 @@
 #define STM32_USB_IRQ_PRIORITY   11
 
 
+#define STM32_SW_HSI		(0 << 0)
 #define STM32_SW_PLL		(2 << 0)
+#define STM32_PLLSRC_HSI	(0 << 16)
 #define STM32_PLLSRC_HSE	(1 << 16)
 
 #define STM32_PLLXTPRE_DIV1	(0 << 17)
@@ -32,6 +34,7 @@
 
 #define STM32_HPRE_DIV1		(0 << 4)
 
+#define STM32_PPRE1_DIV1	(0 << 8)
 #define STM32_PPRE1_DIV2	(4 << 8)
 
 #define STM32_PPRE2_DIV1        (0 << 11)
@@ -44,23 +47,23 @@
 
 #define STM32_MCO_NOCLOCK	(0 << 24)
 
-#define STM32_SW		STM32_SW_PLL
-#define STM32_PLLSRC		STM32_PLLSRC_HSE
-#define STM32_HPRE		STM32_HPRE_DIV1
 #define STM32_PPRE1		STM32_PPRE1_DIV2
+#define STM32_PLLSRC		STM32_PLLSRC_HSE
+#define STM32_FLASHBITS		0x00000012
+#define STM32_PLLCLKIN		(STM32_HSECLK / 1)
+
+#define STM32_SW		STM32_SW_PLL
+#define STM32_HPRE		STM32_HPRE_DIV1
 #define STM32_PPRE2		STM32_PPRE2_DIV1
 #define STM32_ADCPRE		STM32_ADCPRE_DIV6
 #define STM32_MCOSEL		STM32_MCO_NOCLOCK
 #define STM32_USBPRE            STM32_USBPRE_DIV1P5
 
-#define STM32_PLLCLKIN		(STM32_HSECLK / 1)
 #define STM32_PLLMUL		((STM32_PLLMUL_VALUE - 2) << 18)
 #define STM32_PLLCLKOUT		(STM32_PLLCLKIN * STM32_PLLMUL_VALUE)
 #define STM32_SYSCLK		STM32_PLLCLKOUT
 #define STM32_HCLK		(STM32_SYSCLK / 1)
 
-#define STM32_FLASHBITS		0x00000012
-
 struct NVIC {
   uint32_t ISER[8];
   uint32_t unused1[24];
@@ -92,8 +95,10 @@ nvic_enable_vector (uint32_t n, uint32_t prio)
 
 
 #define PERIPH_BASE	0x40000000
+#define APBPERIPH_BASE   PERIPH_BASE
 #define APB2PERIPH_BASE	(PERIPH_BASE + 0x10000)
 #define AHBPERIPH_BASE	(PERIPH_BASE + 0x20000)
+#define AHB2PERIPH_BASE	(PERIPH_BASE + 0x08000000)
 
 struct RCC {
   volatile uint32_t CR;
@@ -127,6 +132,18 @@ static struct RCC *const RCC = ((struct RCC *const)RCC_BASE);
 
 #define RCC_AHBENR_CRCEN        0x0040
 
+#define RCC_APB2RSTR_AFIORST	0x00000001
+#define RCC_APB2RSTR_IOPARST	0x00000004
+#define RCC_APB2RSTR_IOPBRST	0x00000008
+#define RCC_APB2RSTR_IOPCRST	0x00000010
+#define RCC_APB2RSTR_IOPDRST	0x00000020
+
+#define RCC_APB2ENR_AFIOEN	0x00000001
+#define RCC_APB2ENR_IOPAEN	0x00000004
+#define RCC_APB2ENR_IOPBEN	0x00000008
+#define RCC_APB2ENR_IOPCEN	0x00000010
+#define RCC_APB2ENR_IOPDEN	0x00000020
+
 struct FLASH {
   volatile uint32_t ACR;
   volatile uint32_t KEYR;
@@ -149,7 +166,8 @@ clock_init (void)
   RCC->CR |= RCC_CR_HSION;
   while (!(RCC->CR & RCC_CR_HSIRDY))
     ;
-  RCC->CR &= RCC_CR_HSITRIM | RCC_CR_HSION;
+  /* Reset HSEON, HSEBYP, CSSON, and PLLON, not touching RCC_CR_HSITRIM */
+  RCC->CR &= (RCC_CR_HSITRIM | RCC_CR_HSION);
   RCC->CFGR = 0;
   while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI)
     ;
@@ -169,6 +187,10 @@ clock_init (void)
   RCC->CFGR = STM32_MCOSEL | STM32_USBPRE | STM32_PLLMUL | STM32_PLLXTPRE
     | STM32_PLLSRC | STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE;
 
+  /*
+   * We don't touch RCC->CR2, RCC->CFGR2, RCC->CFGR3, and RCC->CIR.
+   */
+
   /* Flash setup */
   FLASH->ACR = STM32_FLASHBITS;
 
@@ -181,14 +203,21 @@ clock_init (void)
     ;
 }
 
-#define RCC_APB2ENR_IOPAEN	0x00000004
-#define RCC_APB2RSTR_IOPARST	0x00000004
-#define RCC_APB2ENR_IOPBEN	0x00000008
-#define RCC_APB2RSTR_IOPBRST	0x00000008
-#define RCC_APB2ENR_IOPCEN	0x00000010
-#define RCC_APB2RSTR_IOPCRST	0x00000010
-#define RCC_APB2ENR_IOPDEN	0x00000020
-#define RCC_APB2RSTR_IOPDRST	0x00000020
+
+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 *const)AFIO_BASE;
+
+#define AFIO_MAPR_TIM3_REMAP_PARTIALREMAP 0x00000800
+#define AFIO_MAPR_SWJ_CFG_DISABLE         0x04000000
 
 
 struct GPIO {
@@ -212,17 +241,26 @@ struct GPIO {
 #define GPIOE_BASE	(APB2PERIPH_BASE + 0x1800)
 #define GPIOE		((struct GPIO *) GPIOE_BASE)
 
-static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
 static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
+#ifdef GPIO_USB_BASE
+static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
+#endif
+#ifdef GPIO_OTHER_BASE
+static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
+#endif
 
 static void
 gpio_init (void)
 {
   /* Enable GPIO clock. */
-  RCC->APB2ENR |= RCC_APB2ENR_IOP_EN;
-  RCC->APB2RSTR = RCC_APB2RSTR_IOP_RST;
+  RCC->APB2ENR |= RCC_ENR_IOP_EN;
+  RCC->APB2RSTR = RCC_RSTR_IOP_RST;
   RCC->APB2RSTR = 0;
 
+#ifdef AFIO_MAPR_SOMETHING
+  AFIO->MAPR |= AFIO_MAPR_SOMETHING;
+#endif
+
   GPIO_USB->ODR = VAL_GPIO_ODR;
   GPIO_USB->CRH = VAL_GPIO_CRH;
   GPIO_USB->CRL = VAL_GPIO_CRL;
@@ -232,6 +270,12 @@ gpio_init (void)
   GPIO_LED->CRH = VAL_GPIO_LED_CRH;
   GPIO_LED->CRL = VAL_GPIO_LED_CRL;
 #endif
+
+#ifdef GPIO_OTHER_BASE
+  GPIO_OTHER->ODR = VAL_GPIO_OTHER_ODR;
+  GPIO_OTHER->CRH = VAL_GPIO_OTHER_CRH;
+  GPIO_OTHER->CRL = VAL_GPIO_OTHER_CRL;
+#endif
 }
 
 static void
@@ -276,8 +320,6 @@ static void wait (int count)
     asm volatile ("" : : "r" (i) : "memory");
 }
 
-#define USB_IRQ 20
-#define USB_IRQ_PRIORITY ((11) << 4)
 
 static void
 usb_lld_sys_shutdown (void)
@@ -548,10 +590,13 @@ 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. */
-		"mov.w	r0, #0xed00\n\t" /* r0 = SCR */
-		"movt	r0, #0xe000\n\t"
-		"mov	r1, pc\n\t"	 /* r1 = (PC + 0x1000) & ~0x0fff */
+		"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"
@@ -560,7 +605,9 @@ reset (void)
 		"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"
+		"bx	r0\n\t"
+		".align	2\n"
+	"1:	.word	0xe000ed00"
 		: /* no output */ : /* no input */ : "memory");
 
   /* Never reach here. */

rules.mk

@@ -10,6 +10,10 @@ INCDIR += $(CHOPSTX)
 
 BUILDDIR = build
 OUTFILES = $(BUILDDIR)/$(PROJECT).elf $(BUILDDIR)/$(PROJECT).bin
+ifneq ($(ENABLE_OUTPUT_HEX),)
+OUTFILES += $(BUILDDIR)/$(PROJECT).hex
+endif
+
 
 OPT += -ffunction-sections -fdata-sections -fno-common
 
@@ -49,6 +53,9 @@ $(OBJS) : $(BUILDDIR)/%.o : %.c Makefile
 %.bin: %.elf $(LDSCRIPT)
 	$(OBJCOPY) -O binary $< $@
 
+%.hex: %.elf $(LDSCRIPT)
+	$(OBJCOPY) -O ihex $< $@
+
 clean:
 	-rm -f -r .dep $(BUILDDIR)