mirror of
https://github.com/eddyem/stm32samples.git
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52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/*
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* systick_blink.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 "stm32f3.h"
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static volatile uint32_t blink_ctr = 0;
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void sys_tick_handler(void){
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++blink_ctr;
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}
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static void gpio_setup(void){
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RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
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GPIOA->MODER = GPIO_MODER_MODER8_O | GPIO_MODER_MODER6_O;
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GPIOA->ODR = 0;
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GPIOB->MODER = GPIO_MODER_MODER0_O | GPIO_MODER_MODER1_O;
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GPIOB->ODR = 3;
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}
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int main(void){
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if(!StartHSE()) StartHSI();
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SysTick_Config((uint32_t)72000); // 1ms
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gpio_setup();
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//while(blink_ctr < 9);
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uint32_t ctr = blink_ctr;
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while(1){
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if(blink_ctr - ctr > 499){
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ctr = blink_ctr;
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pin_toggle(GPIOA, 1<<8|1<<6);
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pin_toggle(GPIOB, 3);
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}
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}
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}
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