be1d296e2f
115200 is a much more sane "default" than 38400. Instead of a mix of 38400 and 115200, just use 115200 in all places. There's no reason for modern 32bit cpus to be using such old slow baudrates. Tested on f1, f4, l1. Replaced some old f1 code that predated some library support code for this.
122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define _GNU_SOURCE
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/usart.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stddef.h>
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#include <sys/types.h>
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static ssize_t _iord(void *_cookie, char *_buf, size_t _n);
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static ssize_t _iowr(void *_cookie, const char *_buf, size_t _n);
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static ssize_t _iord(void *_cookie, char *_buf, size_t _n)
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{
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/* dont support reading now */
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(void)_cookie;
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(void)_buf;
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(void)_n;
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return 0;
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}
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static ssize_t _iowr(void *_cookie, const char *_buf, size_t _n)
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{
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uint32_t dev = (uint32_t)_cookie;
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int written = 0;
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while (_n-- > 0) {
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usart_send_blocking(dev, *_buf++);
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written++;
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};
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return written;
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}
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static FILE *usart_setup(uint32_t dev)
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{
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/* Setup USART2 parameters. */
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usart_set_baudrate(dev, 115200);
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usart_set_databits(dev, 8);
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usart_set_parity(dev, USART_PARITY_NONE);
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usart_set_stopbits(dev, USART_CR2_STOPBITS_1);
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usart_set_mode(dev, USART_MODE_TX_RX);
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usart_set_flow_control(dev, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(dev);
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cookie_io_functions_t stub = { _iord, _iowr, NULL, NULL };
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FILE *fp = fopencookie((void *)dev, "rw+", stub);
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/* Do not buffer the serial line */
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setvbuf(fp, NULL, _IONBF, 0);
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return fp;
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}
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static void clock_setup(void)
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{
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/* Enable GPIOC clock for LED & USARTs. */
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rcc_periph_clock_enable(RCC_GPIOC);
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rcc_periph_clock_enable(RCC_GPIOA);
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/* Enable clocks for USART2. */
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rcc_periph_clock_enable(RCC_USART1);
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}
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static void gpio_setup(void)
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{
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/* Setup GPIO pin GPIO8/9 on GPIO port C for LEDs. */
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gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO8 | GPIO9);
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/* Setup GPIO pins for USART2 transmit. */
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
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/* Setup USART1 TX pin as alternate function. */
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gpio_set_af(GPIOA, GPIO_AF1, GPIO9);
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}
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int main(void)
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{
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int i, c = 0;
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FILE *fp;
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clock_setup();
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gpio_setup();
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fp = usart_setup(USART1);
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/* Blink the LED (PD12) on the board with every transmitted byte. */
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while (1) {
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gpio_toggle(GPIOC, GPIO8); /* LED on/off */
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fprintf(fp, "Pass: %d\n", c);
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c = (c == 200) ? 0 : c + 1; /* Increment c. */
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("NOP");
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}
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}
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return 0;
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}
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