mirror of
https://github.com/eddyem/stm32samples.git
synced 2026-08-12 09:39:25 +03:00
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/*
|
|
* This file is part of the blink project.
|
|
* Copyright 2023 Edward V. Emelianov <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 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/>.
|
|
*/
|
|
|
|
#include "stm32g4.h"
|
|
|
|
// KEY (intpullup->0) - PC13
|
|
// LED - PC6
|
|
#define KEY_PORT GPIOC
|
|
#define KEY_PIN (1<<13)
|
|
#define LED_PORT GPIOC
|
|
#define LED_PIN (1<<6)
|
|
#define KEY_PRESSED() (pin_read(KEY_PORT, KEY_PIN) == 1)
|
|
#define LED_ON() do{pin_set(LED_PORT, LED_PIN);}while(0)
|
|
#define LED_OFF() do{pin_clear(LED_PORT, LED_PIN);}while(0)
|
|
#define LED_TOGG() do{pin_toggle(LED_PORT, LED_PIN);}while(0)
|
|
|
|
static volatile uint32_t Tms = 0;
|
|
|
|
/* Called when systick fires */
|
|
void sys_tick_handler(void){
|
|
++Tms;
|
|
}
|
|
|
|
static void gpio_setup(void){
|
|
RCC->AHB2ENR = RCC_AHB2ENR_GPIOCEN; // enable PC
|
|
// set PC6 as push-pull output, PC13 is pulldown input, other as default (AIN)
|
|
GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE6 | GPIO_MODER_MODE13)) | MODER_O(6) | MODER_I(13);
|
|
GPIOC->PUPDR = PUPD_PD(13); // pulldown
|
|
GPIOC->OTYPER = OTYPER_PP(6); // push-pull (default)
|
|
// count milliseconds
|
|
SysTick_Config(SysFreq / 1000); // arg should be < 0xffffff
|
|
}
|
|
|
|
static const uint32_t L[] = {300, 125,100,125,100,125,200, 350,100,350,100,350,200, 125,100,125,100,125, 1000};
|
|
|
|
int main(void){
|
|
StartHSE();
|
|
gpio_setup();
|
|
uint32_t idx = 0, Told = 0;
|
|
int pressed = 0;
|
|
/* Do nothing in main loop */
|
|
while (1){
|
|
if(KEY_PRESSED()){ // key not pressed - 'sos'
|
|
if(idx & 1) LED_ON();
|
|
else LED_OFF();
|
|
while(Tms - Told < L[idx]);
|
|
if(++idx == 19) idx = 0;
|
|
}else{ // key pressed - blink with period of 1s
|
|
if(pressed){
|
|
idx = 0;
|
|
pressed = 0;
|
|
}
|
|
LED_TOGG();
|
|
while(Tms - Told < 500);
|
|
}
|
|
Told = Tms;
|
|
}
|
|
}
|