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authorGareth McMullin2011-02-17 21:50:00 +1300
committerGareth McMullin2011-02-17 21:50:00 +1300
commit4ed536c988bc933a852405caff8173c5eeaef418 (patch)
treea46bb6287c55ca60017a332612f0a2335c71b252 /examples/stm32
parentf0a1282d429023958e750a7821c577c132365485 (diff)
Added example using ITM and TPIU for TRACESWO output.
Diffstat (limited to 'examples/stm32')
-rw-r--r--examples/stm32/stm32-h103/Makefile10
-rw-r--r--examples/stm32/stm32-h103/traceswo/Makefile23
-rw-r--r--examples/stm32/stm32-h103/traceswo/README11
-rw-r--r--examples/stm32/stm32-h103/traceswo/traceswo.c100
-rw-r--r--examples/stm32/stm32-h103/traceswo/traceswo.ld31
5 files changed, 173 insertions, 2 deletions
diff --git a/examples/stm32/stm32-h103/Makefile b/examples/stm32/stm32-h103/Makefile
index af90100..a319da6 100644
--- a/examples/stm32/stm32-h103/Makefile
+++ b/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
diff --git a/examples/stm32/stm32-h103/traceswo/Makefile b/examples/stm32/stm32-h103/traceswo/Makefile
new file mode 100644
index 0000000..37510d5
--- /dev/null
+++ b/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
+
diff --git a/examples/stm32/stm32-h103/traceswo/README b/examples/stm32/stm32-h103/traceswo/README
new file mode 100644
index 0000000..34b5227
--- /dev/null
+++ b/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.
+
diff --git a/examples/stm32/stm32-h103/traceswo/traceswo.c b/examples/stm32/stm32-h103/traceswo/traceswo.c
new file mode 100644
index 0000000..ac461bb
--- /dev/null
+++ b/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;
+}
diff --git a/examples/stm32/stm32-h103/traceswo/traceswo.ld b/examples/stm32/stm32-h103/traceswo/traceswo.ld
new file mode 100644
index 0000000..7ea2b92
--- /dev/null
+++ b/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
+