Initial commit.

2013-04-19 17:19:32 -07:00
commit 9d5526f773
324 changed files with 22845 additions and 0 deletions
--- a/examples/stm32/f1/stm32-h103/traceswo/traceswo.c
+++ b/examples/stm32/f1/stm32-h103/traceswo/traceswo.c
@@ -0,0 +1,101 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/f1/rcc.h>
+#include <libopencm3/stm32/f1/gpio.h>
+
+#include <libopencm3/stm32/dbgmcu.h>
+#include <libopencm3/cm3/scs.h>
+#include <libopencm3/cm3/tpiu.h>
+#include <libopencm3/cm3/itm.h>
+
+static void clock_setup(void)
+{
+	rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+	/* Enable GPIOC clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
+}
+
+static 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 u32 *)0xE0000FB0) = 0xC5ACCE55;
+
+	/* Enable ITM with ID = 1. */
+	ITM_TCR = (1 << 16) | ITM_TCR_ITMENA;
+	/* Enable stimulus port 1. */
+	ITM_TER[0] = 1;
+}
+
+static 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);
+}
+
+static 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;
+}