mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 18:55:13 +03:00
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
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* This file is part of the usart project.
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* Copyright 2023 Edward V. Emelianov <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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include <stm32g0.h>
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#include "i2c.h"
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#include "proto.h"
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#include "strfunc.h"
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#include "usart.h"
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// KEY (intpullup->0) - PC0
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// LED - PC8
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volatile uint32_t Tms = 0;
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/* Called when systick fires */
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void sys_tick_handler(void){
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++Tms;
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}
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static void gpio_setup(void){
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RCC->IOPENR |= RCC_IOPENR_GPIOCEN; // enable PC
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// set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
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GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
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GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
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GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
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}
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int main(void){
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StartHSE();
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SysTick_Config(8000); // 1ms counter
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gpio_setup();
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usart3_setup();
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uint32_t T = 0;
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int sent = 0;
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/* Do nothing in main loop */
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while (1){
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if(I2C_scan_mode){
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uint8_t addr;
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int ok = i2c_scan_next_addr(&addr);
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if(addr == I2C_ADDREND) USND("Scan ends\n");
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else if(ok){
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USND(uhex2str(addr));
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USND(" ("); USND(u2str(addr));
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USND(") - found device\n");
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}
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}
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if(Tms - T > 499){ // blink LED
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T = Tms;
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pin_toggle(GPIOC, 1<<8);
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usart3_sendbuf();
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}
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if(pin_read(GPIOC, 1<<0) == 0){ // key pressed - send data over USART
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if(!sent){
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usart3_sendstr("Button pressed\n");
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sent = 1;
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}
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}else sent = 0;
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int wasbo = 0;
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char *rcv = usart3_getline(&wasbo);
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if(wasbo) usart3_sendstr("Buffer overflow occured @ last message\n");
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if(rcv) rcv = parse_cmd(rcv);
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if(rcv) usart3_sendstr(rcv);
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i2c_have_DMA_Rx(); // check if there's DMA Rx complete
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}
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}
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