led_clock-old/main.c

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/* 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/>.
*
*/
/* Copyright (c) 2016 King Kévin <kingkevin@cuvoodoo.info> */
/* standard libraries */
#include <stdint.h> // standard integer types
#include <stdio.h> // standard I/O facilities
#include <stdlib.h> // standard utilities
#include <unistd.h> // standard streams
#include <errno.h> // error number utilities
/* STM32 (including CM3) libraries */
#include <libopencm3/stm32/rcc.h> // real-time control clock library
#include <libopencm3/stm32/gpio.h> // general purpose input output library
#include <libopencm3/cm3/scb.h> // vector table definition
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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/* own libraries */
#include "main.h" // board definitions
#include "usart.h" // USART utilities
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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/* default output (i.e. for printf) */
int _write(int file, char *ptr, int len)
{
int i;
if (file == STDOUT_FILENO || file == STDERR_FILENO) {
for (i = 0; i < len; i++) {
if (ptr[i] == '\n') { // add carrier return before line feed. this is recommended for most UART terminals
usart_putchar_nonblocking('\r'); // a second line feed doesn't break the display
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cdcacm_putchar('\r'); // a second line feed doesn't break the display
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}
usart_putchar_nonblocking(ptr[i]); // send byte over USART
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cdcacm_putchar(ptr[i]); // send byte over USB
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}
return i;
}
errno = EIO;
return -1;
}
static void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_72mhz(); // use 8 MHz high speed external clock to generate 72 MHz internal clock
rcc_periph_clock_enable(LED_RCC); //enable clock for LED
}
static void gpio_setup(void)
{
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gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN); // set LED pin to 'output push-pull'
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}
int main(void)
{
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SCB_VTOR = (uint32_t) 0x08002000; // relocate vector table because of the bootloader
clock_setup(); // setup main clock
gpio_setup(); // setup main inputs/ouputs
usart_setup(); // setup USART (for printing)
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cdcacm_setup(); // setup USB CDC ACM (for printing)
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setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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printf("welcome to the STM32F1 CuVoodoo example code\n");
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/* blink the LED with every transmitted character */
while (1) {
while (usart_received) { // echo every received character
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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
printf("%c",usart_getchar()); // transmit receive character
}
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while (cdcacm_received) { // echo every received character
gpio_toggle(LED_PORT, LED_PIN); // toggle LED
printf("%c",cdcacm_getchar()); // transmit receive character
}
__WFI(); // go to sleep
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}
return 0;
}