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blink for G0 works

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This commit is contained in:
Edward Emelianov
2023-01-06 17:44:26 +03:00
parent cc25da3d12
commit 17c4367b9c
9 changed files with 175 additions and 48 deletions
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57
G0:G070/blink/systick_blink.c
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@@ -1,11 +1,10 @@
/*
* systick_blink.c
* This file is part of the blink project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* 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
* 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,
@@ -14,15 +13,13 @@
* 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.
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stm32g0.h"
// KEY (intpullup->0) - PC0
// LED - PC7
// LED - PC8
static volatile uint32_t blink_ctr = 0;
@@ -34,44 +31,48 @@ void sys_tick_handler(void){
/*
* Set up timer to fire every x milliseconds
*/
static void systick_setup(uint32_t xms){ // xms < 1864!!!
static void systick_setup(uint32_t xms){ // xms < 2098!!!
static uint32_t curms = 0;
if(curms == xms) return;
// 9MHz - HCLK/8
// 8MHz - HCLK/8
// this function also clears counter so it starts right away
SysTick_Config(9000 * xms); // arg should be < 0xffffff, so ms should be < 1864
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 PC7 as opendrain output, PC0 is pullup input
GPIOC->MODER = GPIO_MODER_MODER7_O;
GPIOC->PUPDR = GPIO_PUPDR_PUPD0;
GPIOC->OTYPER = GPIO_OTYPER_OT7;
// set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
}
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();
//StartHSI48();
gpio_setup();
/* 500ms ticks => 1000ms period => 1Hz blinks */
systick_setup(100);
systick_setup(500);
uint32_t M = 0;
int pressed = 0;
/* Do nothing in main loop */
while (1){
if(pin_read(GPIOC, 1<<7)){ // key not pressed - 'sos'
uint32_t T = blink_ctr % 18;
systick_setup(L[T]);
if(T & 1) pin_clear(GPIOC, 1<<7);
else pin_set(GPIOC, 1<<7);
if(pin_read(GPIOC, 1<<0) == 0){ // key not pressed - 'sos'
pressed = 1;
systick_setup(L[M]);
if(M & 1) pin_set(GPIOC, 1<<8);
else pin_clear(GPIOC, 1<<8);
if(++M == 18) M = 0;
}else{ // key pressed - blink with period of 1s
systick_setup(500);
if(blink_ctr & 1) pin_clear(GPIOC, 1<<7);
else pin_set(GPIOC, 1<<7);
if(pressed){
M = 0;
pressed = 0;
systick_setup(500);
}
if(blink_ctr & 1) pin_set(GPIOC, 1<<8);
else pin_clear(GPIOC, 1<<8);
}
}
}