mirror of
https://github.com/eddyem/stm32samples.git
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84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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* This file is part of the blink 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 <stm32g4.h>
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#include <string.h>
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#include "hardware.h"
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#include "usart.h"
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#include "usb_dev.h"
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// 40ms for debouncing
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#define TDEBOUNCE (40)
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// USB input buffer
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#define INBUFSZ (256)
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int main(void){
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char inbuff[INBUFSZ];
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const char *spressed = "Key pressed\n", *sreleased = "Key released\n";
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StartHSE();
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gpio_setup();
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usart_setup(115200);
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USB_setup();
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uint8_t pressed = 0;
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uint32_t Tblink = 0, Tkey = 0; // blink and key pressed time
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while(1){
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USART_flags_t f = usart_process();
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if(f.rxovrfl) usart_sendstr("Rx buffer overflow!\n");
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if(f.txerr) usart_sendstr("Tx error!\n");
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char *str = usart_getline();
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if(str){
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usart_sendstr("Received:\n");
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usart_sendstr(str);
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int l = strlen(str);
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if(str[l-1] != '\n'){
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usart_sendstr("\n(only part of line)\n");
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}
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}
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if(Tms - Tblink > 499){
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LED_TOGG();
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Tblink = Tms;
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}
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if(KEY_PRESSED()){
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if(!pressed){ // new event
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pressed = 1;
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usart_sendstr(spressed);
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USB_putbyte('1'); USB_putbyte('1'); newline();
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USB_sendstr(spressed);
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}
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Tkey = Tms;
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}else{ // key released
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if(pressed && (Tms - Tkey) > TDEBOUNCE){ // wait for debounce
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pressed = 0;
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usart_sendstr(sreleased);
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USB_putbyte('0'); USB_putbyte('0'); newline();
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USB_sendstr(sreleased);
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}
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}
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int l = USB_receivestr(inbuff, INBUFSZ);
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if(l < 0) usart_sendstr("ERROR: USB buffer overflow or string was too long\n");
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else if(l){
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usart_sendstr("USB:\n");
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usart_sendstr(inbuff);
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usart_send("\n", 1);
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USB_sendstr(inbuff);
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newline();
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}
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}
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}
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