mirror of
https://github.com/eddyem/stm32samples.git
synced 2026-03-20 00:30:57 +03:00
87 lines
2.7 KiB
C
87 lines
2.7 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 "stm32g0.h"
|
|
|
|
#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)
|
|
|
|
// KEY (intpullup->0) - PC13
|
|
// LED - PC6
|
|
|
|
static volatile uint32_t blink_ctr = 0;
|
|
|
|
/* Called when systick fires */
|
|
void sys_tick_handler(void){
|
|
++blink_ctr;
|
|
}
|
|
|
|
/*
|
|
* Set up timer to fire every x milliseconds
|
|
*/
|
|
static void systick_setup(uint32_t xms){ // xms < 2098!!!
|
|
blink_ctr = 0;
|
|
static uint32_t curms = 0;
|
|
if(curms == xms) return;
|
|
// 8MHz - HCLK/8
|
|
// this function also clears counter so it starts right away
|
|
SysTick_Config(8000 * xms); // arg should be < 0xffffff, so ms should be < 2098
|
|
curms = xms;
|
|
}
|
|
|
|
static void gpio_setup(void){
|
|
RCC->IOPENR = RCC_IOPENR_GPIOCEN; // enable PC
|
|
// set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
|
|
GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE6 | GPIO_MODER_MODE13)) | GPIO_MODER_MODER6_O; // GPIO_MODER_MODER13_I == 0
|
|
GPIOC->PUPDR = GPIO_PUPDR13_PD; // pull down
|
|
}
|
|
|
|
static const uint32_t L[] = {125,100,125,100,125,200, 350,100,350,100,350,200, 125,100,125,100,125, 1000};
|
|
|
|
int main(void){
|
|
StartHSE();
|
|
gpio_setup();
|
|
systick_setup(500);
|
|
uint32_t M = 0;
|
|
int pressed = 0;
|
|
/* Do nothing in main loop */
|
|
while (1){
|
|
if(KEY_PRESSED()){ // key pressed - 'sos'
|
|
pressed = 1;
|
|
systick_setup(L[M]);
|
|
if(M & 1) LED_OFF();
|
|
else LED_ON();
|
|
if(++M == 18) M = 0;
|
|
while(blink_ctr == 0);
|
|
}else{ // key not pressed - blink with period of 1s
|
|
if(pressed){
|
|
M = 0;
|
|
pressed = 0;
|
|
systick_setup(500);
|
|
}
|
|
if(blink_ctr & 1) LED_ON();
|
|
else LED_OFF();
|
|
}
|
|
}
|
|
}
|