mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 10:45:11 +03:00
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*
|
|
* systick_blink.c
|
|
*
|
|
* Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
|
|
*
|
|
* 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 2 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
* MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include <stm32f4.h>
|
|
|
|
static volatile uint32_t blink_ctr = 0;
|
|
|
|
void sys_tick_handler(void){
|
|
++blink_ctr;
|
|
}
|
|
|
|
TRUE_INLINE void gpio_setup(void){
|
|
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOEEN | RCC_AHB1ENR_GPIOCEN;
|
|
GPIOC->MODER = GPIO_MODER_MODER13_O;
|
|
GPIOE->MODER = GPIO_MODER_MODER2_O;
|
|
}
|
|
|
|
int main(void){
|
|
if(!StartHSE()) StartHSI();
|
|
// system frequency is 144MHz
|
|
SysTick_Config((uint32_t)144000); // 1ms
|
|
gpio_setup();
|
|
uint32_t ctr = blink_ctr;
|
|
while(1){
|
|
if(blink_ctr - ctr > 499){
|
|
ctr = blink_ctr;
|
|
pin_toggle(GPIOE, 1<<2);
|
|
pin_toggle(GPIOC, 1<<13);
|
|
}
|
|
}
|
|
}
|