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authorPiotr Esden-Tempski2011-02-18 12:18:57 -0800
committerPiotr Esden-Tempski2011-02-18 12:18:57 -0800
commit662e77b4ee3a46035f5c8a77118134b5913c1e9a (patch)
treeffa9d8856e1f74f25e800433064f937e7b872768 /examples
parenta71c4c128a4053dbcda428e8b0edbc048e32a45f (diff)
Added a printf example that is using irq and a ring buffer to write to USART1 port. It is also reflecting the text you write to the device.
Diffstat (limited to 'examples')
-rw-r--r--examples/stm32/stm32-h103/Makefile10
-rw-r--r--examples/stm32/stm32-h103/usart_irq_printf/Makefile23
-rw-r--r--examples/stm32/stm32-h103/usart_irq_printf/usart_irq_printf.c272
-rw-r--r--examples/stm32/stm32-h103/usart_irq_printf/usart_irq_printf.ld31
4 files changed, 334 insertions, 2 deletions
diff --git a/examples/stm32/stm32-h103/Makefile b/examples/stm32/stm32-h103/Makefile
index 2bee7c5..063cd21 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 usart_irq usart_printf usb_cdcacm usb_hid button exti_both
+all: miniblink fancyblink usart usart_irq usart_printf usart_irq_printf usb_cdcacm usb_hid button exti_both
miniblink:
@printf " BUILD examples/stm32/stm32-h103/miniblink\n"
@@ -46,6 +46,10 @@ usart_printf:
@printf " BUILD examples/stm32/stm32-h103/usart_printf\n"
$(Q)$(MAKE) -C usart_printf
+usart_irq_printf:
+ @printf " BUILD examples/stm32/stm32-h103/usart_irq_printf\n"
+ $(Q)$(MAKE) -C usart_irq_printf
+
spi:
@printf " BUILD examples/stm32/stm32-h103/spi\n"
$(Q)$(MAKE) -C spi
@@ -77,6 +81,8 @@ clean:
$(Q)$(MAKE) -C usart_irq clean
@printf " CLEAN examples/stm32/stm32-h103/usart_printf\n"
$(Q)$(MAKE) -C usart_printf clean
+ @printf " CLEAN examples/stm32/stm32-h103/usart_irq_printf\n"
+ $(Q)$(MAKE) -C usart_irq_printf clean
@printf " CLEAN examples/stm32/stm32-h103/spi\n"
$(Q)$(MAKE) -C spi clean
@printf " CLEAN examples/stm32/stm32-h103/usb_cdcacm\n"
@@ -88,5 +94,5 @@ clean:
@printf " CLEAN examples/stm32/stm32-h103/exti_both\n"
$(Q)$(MAKE) -C exti_both clean
-.PHONY: miniblink fancyblink usart usart_irq usart_printf spi usb_cdcacm usb_hid button exti_both clean
+.PHONY: miniblink fancyblink usart usart_irq usart_printf usart_irq_printf spi usb_cdcacm usb_hid button exti_both clean
diff --git a/examples/stm32/stm32-h103/usart_irq_printf/Makefile b/examples/stm32/stm32-h103/usart_irq_printf/Makefile
new file mode 100644
index 0000000..2917a7d
--- /dev/null
+++ b/examples/stm32/stm32-h103/usart_irq_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_irq_printf
+
+include ../../Makefile.include
+
diff --git a/examples/stm32/stm32-h103/usart_irq_printf/usart_irq_printf.c b/examples/stm32/stm32-h103/usart_irq_printf/usart_irq_printf.c
new file mode 100644
index 0000000..42a7472
--- /dev/null
+++ b/examples/stm32/stm32-h103/usart_irq_printf/usart_irq_printf.c
@@ -0,0 +1,272 @@
+/*
+ * 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 <libopencm3/stm32/systick.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+/******************************************************************************
+ * Simple ringbuffer implementation from open-bldc's libgovernor that
+ * you can find at:
+ * https://github.com/open-bldc/open-bldc/tree/master/source/libgovernor
+ ******************************************************************************/
+
+typedef s32 ring_size_t;
+
+struct ring {
+ u8 *data;
+ ring_size_t size;
+ u32 begin;
+ u32 end;
+};
+
+#define RING_SIZE(RING) ((RING)->size - 1)
+#define RING_DATA(RING) (RING)->data
+#define RING_EMPTY(RING) ((RING)->begin == (RING)->end)
+
+void ring_init(struct ring *ring, u8 * buf, ring_size_t size)
+{
+ ring->data = buf;
+ ring->size = size;
+ ring->begin = 0;
+ ring->end = 0;
+}
+
+s32 ring_write_ch(struct ring *ring, u8 ch)
+{
+ if (((ring->end + 1) % ring->size) != ring->begin) {
+ ring->data[ring->end++] = ch;
+ ring->end %= ring->size;
+ return (u32) ch;
+ }
+
+ return -1;
+}
+
+s32 ring_write(struct ring * ring, u8 * data, ring_size_t size)
+{
+ s32 i;
+
+ for (i = 0; i < size; i++) {
+ if (ring_write_ch(ring, data[i]) < 0) {
+ return -i;
+ }
+ }
+
+ return i;
+}
+
+s32 ring_read_ch(struct ring * ring, u8 * ch)
+{
+ s32 ret = -1;
+
+ if (ring->begin != ring->end) {
+ ret = ring->data[ring->begin++];
+ ring->begin %= ring->size;
+ if (ch)
+ *ch = ret;
+ }
+
+ return ret;
+}
+
+s32 ring_read(struct ring * ring, u8 * data, ring_size_t size)
+{
+ s32 i;
+
+ for (i = 0; i < size; i++) {
+ if (ring_read_ch(ring, data + i) < 0) {
+ return i;
+ }
+ }
+
+ return -i;
+}
+
+/******************************************************************************
+ * The example implementation
+ ******************************************************************************/
+
+#define BUFFER_SIZE 1024
+
+struct ring output_ring;
+u8 output_ring_buffer[BUFFER_SIZE];
+
+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)
+{
+
+ /* Initialize output ring buffer */
+ ring_init(&output_ring, output_ring_buffer, BUFFER_SIZE);
+
+ /* Enable the USART1 interrupt. */
+ nvic_enable_irq(NVIC_USART1_IRQ);
+
+ /* 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 GPIO pin GPIO_USART1_RE_RX on GPIO port B for receive. */
+ gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
+ GPIO_CNF_INPUT_FLOAT, GPIO_USART1_RX);
+
+ /* 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_RX);
+
+ /* Enable USART1 Receive interrupt. */
+ USART_CR1(USART1) |= USART_CR1_RXNEIE;
+
+ /* 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);
+}
+
+void usart1_isr(void)
+{
+ /* Check if we were called because of RXNE. */
+ if (((USART_CR1(USART1) & USART_CR1_RXNEIE) != 0) &&
+ ((USART_SR(USART1) & USART_SR_RXNE) != 0)) {
+
+ /* Indicate that we got data. */
+ gpio_toggle(GPIOC, GPIO12);
+
+ /* Retrieve the data from the peripheral. */
+ ring_write_ch(&output_ring, usart_recv(USART1));
+
+ /* Enable transmit interrupt so it sends back the data. */
+ USART_CR1(USART1) |= USART_CR1_TXEIE;
+ }
+
+ /* Check if we were called because of TXE. */
+ if (((USART_CR1(USART1) & USART_CR1_TXEIE) != 0) &&
+ ((USART_SR(USART1) & USART_SR_TXE) != 0)) {
+
+ s32 data;
+
+ data = ring_read_ch(&output_ring, NULL);
+
+ if (data == -1) {
+ /* Disable the TXE interrupt as we don't need it anymore. */
+ USART_CR1(USART1) &= ~USART_CR1_TXEIE;
+ } else {
+ /* Put data into the transmit register. */
+ usart_send(USART1, data);
+ }
+ }
+}
+
+int _write (int file, char *ptr, int len)
+{
+ int ret;
+
+ if (file == 1) {
+ ret = ring_write(&output_ring, (u8 *)ptr, len);
+
+ if (ret < 0) ret = -ret;
+
+ USART_CR1(USART1) |= USART_CR1_TXEIE;
+
+ return ret;
+ }
+
+ errno = EIO;
+ return -1;
+}
+
+void systick_setup(void) {
+
+ /* 72MHz / 8 => 9000000 counts per second */
+ systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
+
+ /* 9000000/9000 = 1000 overflows per second - every 1ms one interrupt */
+ systick_set_reload(9000);
+
+ systick_interrupt_enable();
+
+ /* Start counting. */
+ systick_counter_enable();
+
+}
+
+void sys_tick_handler(void)
+{
+ static int counter = 0;
+ static float fcounter = 0.0;
+ static double dcounter = 0.0;
+
+ static u32 temp32 = 0;
+
+ temp32++;
+
+ /* We call this handler every 1ms so we are sending hello world every 10ms / 100Hz. */
+ if (temp32 == 10) {
+ printf("Hello World! %i %f %f\r\n", counter, fcounter, dcounter);
+ counter++;
+ fcounter+=0.01;
+ dcounter+=0.01;
+
+ temp32 = 0;
+ }
+}
+
+int main(void)
+{
+
+ clock_setup();
+ gpio_setup();
+ usart_setup();
+ systick_setup();
+
+ while (1) {
+ __asm__("nop");
+ }
+
+ return 0;
+}
diff --git a/examples/stm32/stm32-h103/usart_irq_printf/usart_irq_printf.ld b/examples/stm32/stm32-h103/usart_irq_printf/usart_irq_printf.ld
new file mode 100644
index 0000000..7899773
--- /dev/null
+++ b/examples/stm32/stm32-h103/usart_irq_printf/usart_irq_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
+