aboutsummaryrefslogtreecommitdiff
path: root/examples/stm32f1/stm32-h103/usart_irq_printf/usart_irq_printf.c
diff options
context:
space:
mode:
Diffstat (limited to 'examples/stm32f1/stm32-h103/usart_irq_printf/usart_irq_printf.c')
-rw-r--r--examples/stm32f1/stm32-h103/usart_irq_printf/usart_irq_printf.c272
1 files changed, 0 insertions, 272 deletions
diff --git a/examples/stm32f1/stm32-h103/usart_irq_printf/usart_irq_printf.c b/examples/stm32f1/stm32-h103/usart_irq_printf/usart_irq_printf.c
deleted file mode 100644
index deee527..0000000
--- a/examples/stm32f1/stm32-h103/usart_irq_printf/usart_irq_printf.c
+++ /dev/null
@@ -1,272 +0,0 @@
-/*
- * 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/f1/rcc.h>
-#include <libopencm3/stm32/f1/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, rcc_ppre2_frequency);
- 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;
-}