Added example using ITM and TPIU for TRACESWO output.

examples/stm32/stm32-h103/Makefile

@@ -24,7 +24,7 @@ Q := @
 MAKEFLAGS += --no-print-directory
 endif
 
-all: miniblink fancyblink usart usb_cdcacm usb_hid button exti_both
+all: miniblink fancyblink usart usb_cdcacm usb_hid button exti_both traceswo
 
 miniblink:
 	@printf "  BUILD   examples/stm32/stm32-h103/miniblink\n"
@@ -58,6 +58,10 @@ exti_both:
 	@printf "  BUILD   examples/stm32/stm32-h103/exti_both\n"
 	$(Q)$(MAKE) -C exti_both
 
+traceswo:
+	@printf "  BUILD   examples/stm32/stm32-h103/traceswo\n"
+	$(Q)$(MAKE) -C traceswo
+
 clean:
 	@printf "  CLEAN   examples/stm32/stm32-h103/miniblink\n"
 	$(Q)$(MAKE) -C miniblink clean
@@ -75,6 +79,8 @@ clean:
 	$(Q)$(MAKE) -C button clean
 	@printf "  CLEAN   examples/stm32/stm32-h103/exti_both\n"
 	$(Q)$(MAKE) -C exti_both clean
+	@printf "  CLEAN   examples/stm32/stm32-h103/traceswo\n"
+	$(Q)$(MAKE) -C traceswo clean
 
-.PHONY: miniblink fancyblink usart spi usb_cdcacm usb_hid button exti_both clean
+.PHONY: miniblink fancyblink usart spi usb_cdcacm usb_hid button exti_both traceswo clean
 

examples/stm32/stm32-h103/traceswo/Makefile

@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## 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 3 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, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = traceswo
+
+include ../../Makefile.include
+

examples/stm32/stm32-h103/traceswo/README

@@ -0,0 +1,11 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This experimental program sends some characters on the TRACESWO pin using 
+the Instrumentation Trace Macrocell (ITM) and Trace Port Interface
+Unit (TPIU).
+
+The SWJ-DP port must be in SWD mode and not JTAG mode for the output
+to be visible.
+

examples/stm32/stm32-h103/traceswo/traceswo.c

@@ -0,0 +1,100 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+#include <libopencm3/stm32/dbgmcu.h>
+#include <libopencm3/cm3/scs.h>
+#include <libopencm3/cm3/tpiu.h>
+#include <libopencm3/cm3/itm.h>
+
+void clock_setup(void)
+{
+	rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+	/* Enable GPIOC clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
+}
+
+void trace_setup(void)
+{
+	/* Enable trace subsystem (we'll use ITM and TPIU) */
+	SCS_DEMCR |= SCS_DEMCR_TRCENA;
+
+	/* Use Manchester code for asynchronous transmission */
+	TPIU_SPPR = TPIU_SPPR_ASYNC_MANCHESTER;
+	TPIU_ACPR = 7;
+
+	/* Data width is 1 byte */
+	TPIU_CSPSR = TPIU_CSPSR_BYTE;
+
+	/* Formatter and flush control */
+	TPIU_FFCR &= ~TPIU_FFCR_ENFCONT;
+
+	/* Enable TRACESWO pin for async mode */
+	DBGMCU_CR = DBGMCU_CR_TRACE_IOEN | DBGMCU_CR_TRACE_MODE_ASYNC;
+
+	/* Unlock access to ITM registers */
+	/* FIXME: Magic numbers... Is this Cortex-M3 generic? */
+	*((volatile uint32_t*)0xE0000FB0) = 0xC5ACCE55;
+
+	/* Enable ITM with ID = 1 */
+	ITM_TCR = (1 << 16) | ITM_TCR_ITMENA;
+	/* Enable stimulus port 1 */
+	ITM_TER[0] = 1;	
+
+}
+
+void gpio_setup(void)
+{
+	/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
+		      GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
+}
+
+void trace_send_blocking(char c)
+{
+	while(!(ITM_STIM[0] & ITM_STIM_FIFOREADY));
+	ITM_STIM[0] = c;
+}
+
+int main(void)
+{
+	int i, j = 0, c = 0;
+
+	clock_setup();
+	gpio_setup();
+	trace_setup();
+
+	/* Blink the LED (PC12) on the board with every transmitted byte. */
+	while (1) {
+		gpio_toggle(GPIOC, GPIO12);	/* LED on/off */
+		trace_send_blocking(c + '0'); 
+		c = (c == 9) ? 0 : c + 1;	/* Increment c. */
+		if ((j++ % 80) == 0) {		/* Newline after line full. */
+			trace_send_blocking('\r');
+			trace_send_blocking('\n');
+		}
+		for (i = 0; i < 800000; i++)	/* Wait a bit. */
+			__asm__("NOP");
+	}
+
+	return 0;
+}

examples/stm32/stm32-h103/traceswo/traceswo.ld

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+