mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 18:55:13 +03:00
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* main.c
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*
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* Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "stm32f0.h"
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#include "usart.h"
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volatile uint32_t Tms = 0;
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/* Called when systick fires */
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void sys_tick_handler(void){
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++Tms;
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}
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static void gpio_setup(void){
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// Set green led (PB3) as output
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RCC->AHBENR |= RCC_AHBENR_GPIOBEN;
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GPIOB->MODER = GPIO_MODER_MODER3_O;
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}
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void printi(int16_t val){
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char buf[6], rbuf[5];
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int l = 0, bpos = 0;
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if(!val){
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buf[0] = '0';
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l = 1;
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}else{
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if(val < 0){
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buf[0] = '-';
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bpos = 1;
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val = -val;
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}
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while(val){
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rbuf[l++] = val % 10 + '0';
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val /= 10;
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}
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int i;
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bpos += l;
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for(i = 0; i < l; ++i){
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buf[--bpos] = rbuf[i];
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}
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}
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while(ALL_OK != usart2_send_blocking(buf, l+bpos));
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while(ALL_OK != usart2_send_blocking("\n", 1));
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}
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int main(void){
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uint32_t lastT = 0, dctr = 0;
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int16_t L = 0;
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char *txt;
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sysreset();
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SysTick_Config(6000, 1);
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gpio_setup();
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usart2_setup();
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while (1){
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if(lastT > Tms || Tms - lastT > 499){
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pin_toggle(GPIOB, 1<<3); // blink by onboard LED once per second
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lastT = Tms;
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}
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if(usart2rx()){ // usart1 received data, store in in buffer
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L = usart2_getline(&txt);
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printi(L);
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// do something with received data
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}
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if(L){ // text waits for sending
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if(ALL_OK == usart2_send(txt, L)){
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L = 0;
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}
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}
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if(dctr > Tms || Tms - dctr > 4999){// once per 5 seconds
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dctr = Tms;
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while(ALL_OK != usart2_send_blocking("Dummy text\n", 11));
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}
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}
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return 0;
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}
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