F4 Discovery: - Unconditionally use the System Bootloader - Use PC2/4/5/6 Pins for JTAG/SWD to avoid collision with eventual STLink Uart connection - Indicate Bootloader with blue LED

src/platforms/f4discovery/Makefile.inc

@@ -7,12 +7,11 @@ CFLAGS += -Istm32/include -mcpu=cortex-m4 -mthumb \
 	-DSTM32F4 -DF4DISCOVERY -I../libopencm3/include \
 	-Iplatforms/stm32
 
-LDFLAGS_BOOT := $(LDFLAGS) -lopencm3_stm32f4 -Wl,--defsym,_stack=0x20020000 \
+LDFLAGS = -lopencm3_stm32f4 -Wl,--defsym,_stack=0x20020000 \
 	-Wl,-T,platforms/stm32/f4discovery.ld -nostartfiles -lc -lnosys \
 	-Wl,-Map=mapfile -mthumb -mcpu=cortex-m4 -Wl,-gc-sections \
 	-mfloat-abi=hard -mfpu=fpv4-sp-d16 \
 	-L../libopencm3/lib
-LDFLAGS = $(LDFLAGS_BOOT) -Wl,-Ttext=0x8010000
 
 VPATH += platforms/stm32
 
@@ -21,19 +20,10 @@ SRC += 	cdcacm.c	\
 	traceswo.c	\
 	usbuart.c	\
 
-all:	blackmagic.bin blackmagic_dfu.bin blackmagic_dfu.hex
+all:	blackmagic.bin
 
 blackmagic.bin:	blackmagic
 	$(OBJCOPY) -O binary $^ $@
 
-blackmagic_dfu: usbdfu.o dfucore.o dfu_f4.o
-	$(CC) $^ -o $@ $(LDFLAGS_BOOT)
-
-blackmagic_dfu.bin:	blackmagic_dfu
-	$(OBJCOPY) -O binary $^ $@
-
-blackmagic_dfu.hex:	blackmagic_dfu
-	$(OBJCOPY) -O ihex $^ $@
-
 host_clean:
-	-rm blackmagic.bin blackmagic_dfu blackmagic_dfu.bin blackmagic_dfu.hex
+	-rm blackmagic.bin

src/platforms/f4discovery/Readme

@@ -1,17 +1,28 @@
-Application start address:
+System vs BMP Bootloader
-=========================
+========================
+For the BMP bootloader, flashing qas not reliable. So we use the system
+bootloder unconditional.
 
-Use 0x8010000
+Connections:
-- lower 3 16 k pages may be used for parameter storage
-- Erasing a single 64 k Page is faster then erasing 2 16 k Pages
-  eventual the 64 k page
-
-
-Internal boot loader:
 ====================
 
-When we request invokation of a bootloader from inside the application,
+PA0: User button to force system bootloader entry with reset
-we boot the device internal bootloader with the blue botton pressed.
+PA2/PA3 eventual connected to the STLINK/ STM32F103C8
 
-That way, we can easy exchange the custom bootloader via the device
+PC2: TDI
-internale bootloader
+PC4: TMS/SWDIO
+PC5: TCK/SWCLK
+PC6: TDO/TRACESWO
+
+PC1: TRST
+PC8: SRST
+
+Blue Led: Indicator that system bootloader is entered via BMP
+
+Bootstrapping the F4Discovery on-board ST-Link
+==============================================
+http://embdev.net/articles/STM_Discovery_as_Black_Magic_Probe has some hints
+how to modify the F4Discovery on-board ST-Link.  If you try to do so and hit
+a problem that stands some test like that you load the right firmware to the
+right device via the right BMP probe, explain, report and ask on the
+blackmagic mailing list http://sourceforge.net/mail/?group_id=407419.

src/platforms/f4discovery/platform.c

@@ -46,23 +46,28 @@ static void morse_update(void);
 
 int platform_init(void)
 {
+	/* Check the USER button*/
+	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN);
+	if(gpio_get(GPIOA, GPIO0)) {
+		assert_boot_pin();
+		scb_reset_core();
+	}
+
 	rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
 
 	/* Enable peripherals */
 	rcc_peripheral_enable_clock(&RCC_AHB2ENR, RCC_AHB2ENR_OTGFSEN);
-	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPCEN);
-	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPBEN);
 	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN);
 	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_CRCEN);
 
-
 	/* Set up USB Pins and alternate function*/
 	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
 		GPIO9 | GPIO11 | GPIO12);
 	gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO11 | GPIO12);
 
-        GPIOA_OSPEEDR &=~0xfc;
+	GPIOC_OSPEEDR &=~0xF30;
-        GPIOA_OSPEEDR |= 0xa8;
+	GPIOC_OSPEEDR |= 0xA20;
 	gpio_mode_setup(JTAG_PORT, GPIO_MODE_OUTPUT,
 			GPIO_PUPD_NONE,
 			TMS_PIN | TCK_PIN | TDI_PIN);
@@ -73,7 +78,7 @@ int platform_init(void)
 
 	gpio_mode_setup(LED_PORT, GPIO_MODE_OUTPUT,
 			GPIO_PUPD_NONE,
-			LED_UART | LED_IDLE_RUN | LED_ERROR | LED_SPARE1);
+			LED_UART | LED_IDLE_RUN | LED_ERROR | LED_BOOTLOADER);
 
 	/* Setup heartbeat timer */
 	systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
@@ -85,8 +90,6 @@ int platform_init(void)
 
 	usbuart_init();
 
-	SCB_VTOR = 0x10000;	// Relocate interrupt vector table here
-
 	cdcacm_init();
 
 	jtag_scan(NULL);
@@ -194,16 +197,14 @@ const char *platform_target_voltage(void)
 
 void assert_boot_pin(void)
 {
-	if (gpio_get(GPIOA, GPIO0)) {
+	/* Assert blue LED as indicator we are in the bootloader */
+	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN);
+	gpio_mode_setup(LED_PORT, GPIO_MODE_OUTPUT,
+		GPIO_PUPD_NONE, LED_BOOTLOADER);
+	gpio_set(LED_PORT, LED_BOOTLOADER);
+
 	/* Jump to the built in bootloader by mapping System flash */
 	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_SYSCFGEN);
 	SYSCFG_MEMRM &= ~3;
 	SYSCFG_MEMRM |=  1;
 }
-        else {
-		/* Flag Bootloader Request by mimicing a pushed USER button*/
-		gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT,
-				GPIO_PUPD_NONE, GPIO0);
-		gpio_set(GPIOA, GPIO0);
-	}
-}

src/platforms/f4discovery/platform.h

@@ -49,15 +49,16 @@ extern usbd_device *usbdev;
  * LED0 = 	PD12	(Green  LED : Running)
  * LED1 = 	PD13	(Orange LED : Idle)
  * LED2 = 	PD12	(Red LED    : Error)
+ * LED3 = 	PD15	(Blue LED   : Bootloader active)
  *
  * TPWR = 	XXX (input) -- analogue on mini design ADC1, ch8
- * nTRST = 	PD0
+ * nTRST = 	PC1
- * SRST_OUT = 	PD1
+ * SRST_OUT =   PC8
- * TDI = 	PA1
+ * TDI = 	PC2
- * TMS = 	PA3 (input for SWDP)
+ * TMS = 	PC4 (input for SWDP)
- * TCK = 	PA8
+ * TCK = 	PC5/SWCLK
- * TDO = 	PB4 (input)
+ * TDO = 	PC6 (input for TRACESWO
- * nSRST = 	PD2 (input)
+ * nSRST =
  *
  * USB cable pull-up: PA8
  * USB VBUS detect:  PB13 -- New on mini design.
@@ -66,32 +67,32 @@ extern usbd_device *usbdev;
  */
 
 /* Hardware definitions... */
-#define JTAG_PORT 	GPIOA
+#define JTAG_PORT 	GPIOC
 #define TDI_PORT	JTAG_PORT
 #define TMS_PORT	JTAG_PORT
 #define TCK_PORT	JTAG_PORT
-#define TDO_PORT	GPIOB
+#define TDO_PORT	GPIOC
-#define TDI_PIN		GPIO1
+#define TDI_PIN		GPIO2
-#define TMS_PIN		GPIO3
+#define TMS_PIN		GPIO4
-#define TCK_PIN		GPIO2
+#define TCK_PIN		GPIO5
-#define TDO_PIN		GPIO4
+#define TDO_PIN		GPIO6
 
 #define SWDIO_PORT 	JTAG_PORT
 #define SWCLK_PORT 	JTAG_PORT
 #define SWDIO_PIN	TMS_PIN
 #define SWCLK_PIN	TCK_PIN
 
-#define TRST_PORT	GPIOD
+#define TRST_PORT	GPIOC
-#define TRST_PIN	GPIO0
+#define TRST_PIN	GPIO1
-#define SRST_PORT	GPIOD
+#define SRST_PORT	GPIOC
-#define SRST_PIN	GPIO1
+#define SRST_PIN	GPIO8
 
 #define LED_PORT	GPIOD
 #define LED_PORT_UART	GPIOD
 #define LED_UART	GPIO12
 #define LED_IDLE_RUN	GPIO13
 #define LED_ERROR	GPIO14
-#define LED_SPARE1	GPIO15
+#define LED_BOOTLOADER	GPIO15
 
 #define TMS_SET_MODE() gpio_mode_setup(TMS_PORT, GPIO_MODE_OUTPUT, \
                                        GPIO_PUPD_NONE, TMS_PIN);