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authorPiotr Esden-Tempski2011-02-17 20:12:44 -0800
committerPiotr Esden-Tempski2011-02-17 20:12:44 -0800
commitfedad2eb9a918a24782781cb22d283e3f9efb8d2 (patch)
tree691aea0168b9c2cad2efd9647d51f50335fb623a /examples
parent4667760392255b7fb9dc9b2bbff5d5aa06630187 (diff)
Added an example using newlib printf for writing to UART1.
Diffstat (limited to 'examples')
-rw-r--r--examples/stm32/Makefile.include9
-rw-r--r--examples/stm32/stm32-h103/usart_printf/Makefile23
-rw-r--r--examples/stm32/stm32-h103/usart_printf/usart_printf.c108
-rw-r--r--examples/stm32/stm32-h103/usart_printf/usart_printf.ld31
4 files changed, 167 insertions, 4 deletions
diff --git a/examples/stm32/Makefile.include b/examples/stm32/Makefile.include
index af6d02f..3eb3d35 100644
--- a/examples/stm32/Makefile.include
+++ b/examples/stm32/Makefile.include
@@ -28,10 +28,11 @@ OBJDUMP = $(PREFIX)-objdump
# TOOLCHAIN_DIR = `dirname \`which $(CC)\``/../$(PREFIX)
TOOLCHAIN_DIR = ../../../..
CFLAGS += -Os -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include \
- -fno-common -mcpu=cortex-m3 -mthumb
+ -fno-common -mcpu=cortex-m3 -mthumb -msoft-float
LDSCRIPT = $(BINARY).ld
-LDFLAGS += -L$(TOOLCHAIN_DIR)/lib -L$(TOOLCHAIN_DIR)/lib/stm32 \
- -T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections
+LDFLAGS += -lc -lnosys -L$(TOOLCHAIN_DIR)/lib -L$(TOOLCHAIN_DIR)/lib/stm32 \
+ -T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections \
+ -mthumb -march=armv7 -mfix-cortex-m3-ldrd -msoft-float
OBJS += $(BINARY).o
OOCD ?= openocd
@@ -76,7 +77,7 @@ flash: $(BINARY).flash
%.elf: $(OBJS) $(LDSCRIPT)
@#printf " LD $(subst $(shell pwd)/,,$(@))\n"
- $(Q)$(LD) $(LDFLAGS) -o $(*).elf $(OBJS) -lopencm3_stm32
+ $(Q)$(LD) -o $(*).elf $(OBJS) -lopencm3_stm32 $(LDFLAGS)
%.o: %.c Makefile
@#printf " CC $(subst $(shell pwd)/,,$(@))\n"
diff --git a/examples/stm32/stm32-h103/usart_printf/Makefile b/examples/stm32/stm32-h103/usart_printf/Makefile
new file mode 100644
index 0000000..fb26208
--- /dev/null
+++ b/examples/stm32/stm32-h103/usart_printf/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 = usart_printf
+
+include ../../Makefile.include
+
diff --git a/examples/stm32/stm32-h103/usart_printf/usart_printf.c b/examples/stm32/stm32-h103/usart_printf/usart_printf.c
new file mode 100644
index 0000000..26fcee6
--- /dev/null
+++ b/examples/stm32/stm32-h103/usart_printf/usart_printf.c
@@ -0,0 +1,108 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
+ * 2011 Piotr Esden-Tempski <piotr@esden.net>
+ *
+ * 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/usart.h>
+#include <libopencm3/stm32/nvic.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+void clock_setup(void)
+{
+ rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+ /* Enable GPIOA clock (for LED GPIOs). */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
+
+ /* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN |
+ RCC_APB2ENR_AFIOEN |
+ RCC_APB2ENR_USART1EN);
+}
+
+void usart_setup(void)
+{
+ /* Setup GPIO pin GPIO_USART1_RE_TX on GPIO port B for transmit. */
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
+
+ /* Setup UART parameters. */
+ usart_set_baudrate(USART1, 230400);
+ usart_set_databits(USART1, 8);
+ usart_set_stopbits(USART1, USART_STOPBITS_1);
+ usart_set_parity(USART1, USART_PARITY_NONE);
+ usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+ usart_set_mode(USART1, USART_MODE_TX);
+
+ /* Finally enable the USART. */
+ usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+ gpio_set(GPIOC, GPIO12);
+
+ /* Setup GPIO6 and 7 (in GPIO port A) for led use. */
+ gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
+}
+
+int _write (int file, char *ptr, int len)
+{
+ int i;
+
+ if (file == 1) {
+ for (i = 0; i < len; i++){
+ usart_send_blocking(USART1, ptr[i]);
+ }
+
+ return i;
+ }
+
+ errno = EIO;
+ return -1;
+}
+
+int main(void)
+{
+ int counter = 0;
+ float fcounter = 0.0;
+ double dcounter = 0.0;
+
+ clock_setup();
+ gpio_setup();
+ usart_setup();
+
+ /*
+ * Write Hello World an integer, float and double all over
+ * again while incrementing the numbers.
+ */
+ while (1) {
+ gpio_toggle(GPIOC, GPIO12);
+ printf("Hello World! %i %f %f\r\n", counter, fcounter, dcounter);
+ counter++;
+ fcounter+=0.01;
+ dcounter+=0.01;
+ }
+
+ return 0;
+}
diff --git a/examples/stm32/stm32-h103/usart_printf/usart_printf.ld b/examples/stm32/stm32-h103/usart_printf/usart_printf.ld
new file mode 100644
index 0000000..7899773
--- /dev/null
+++ b/examples/stm32/stm32-h103/usart_printf/usart_printf.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 Open-BLDC (STM32F103CBT6, 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
+