Fix for Blue Pill, wait using MHZ.

ChangeLog

@@ -1,3 +1,11 @@
+2018-05-08  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* board/board-blue-pill.h (GPIO_USB_SET_TO_ENABLE): Remove.
+
+	* doc/chopstx.texi (Compile-time macro): Add chapter.
+
+	* mcu/sys-stm32f103.c (usb_lld_sys_init): Use MHZ.
+
 2018-04-26  NIIBE Yutaka  <gniibe@fsij.org>
 
 	* board/board-blue-pill-g.h: New.  Define STM32_ADCPRE and

NEWS

@@ -1,6 +1,24 @@
 NEWS - Noteworthy changes
 
 
+* Major changes in Chopstx 1.9
+
+  Released 2018-05-09
+
+** GD32F103 support
+GD32F103 is an alternative implementation of STM32F103 by Giga Device,
+which can run at 96MHz.
+
+** Minor USB driver fix for STM32F103
+BTABLE setting should be done for initialization, not for USB RESET.
+
+** Minor ADC driver change for GD32F103
+ADC on GD32F103 is another implementation and its behavior is somewhat
+different.  It requires waits after enabling.  So, we use continuous
+samping.  Still, we observe enough noise (> 4.7 bit/byte) for each ADC
+sampling.
+
+
 * Major changes in Chopstx 1.8
 
   Released 2018-01-19

board/board-blue-pill.h

@@ -13,13 +13,14 @@
 #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)
+ *
+ * Port C setup.
  * PC13 - Push pull output 50MHz (LED 1:ON 0:OFF)
  * ------------------------ Default
  * PAx  - input with pull-up

doc/chopstx.texi

@@ -11,7 +11,7 @@
 This manual is for Chopstx (version @value{VERSION}).
 
 @noindent
-Copyright @copyright{} 2013, 2015, 2016, 2017 Flying Stone Technology @*
+Copyright @copyright{} 2013, 2015, 2016, 2017, 2018 Flying Stone Technology @*
 
 @quotation
 Permission is granted to copy, distribute and/or modify this document
@@ -157,6 +157,16 @@ program carefully.  Enabling sleep, it may result a bricked board; A
 board with no RESET pin cannot be debugged by JTAG/SWD.
 
 
+@node Compile-time macro
+@chapter Compile-time macro
+
+@subheading MHZ
+@anchor{MHZ}
+@defmac {MHZ}
+Running CPU clock in MHz.  Used for chopstx_usec_wait.
+@end defmac
+
+
 @node API
 @chapter API
 

mcu/sys-stm32f103.c

@@ -82,7 +82,7 @@ usb_lld_sys_init (void)
     {
       usb_lld_sys_shutdown ();
       /* Disconnect requires SE0 (>= 2.5uS).  */
-      wait (300);
+      wait (5*MHZ);
     }
 
   usb_cable_config (1);