/*
 * 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>
#include <string.h>

#include "hardware.h"
#include "usart.h"
#include "usb_dev.h"

// 40ms for debouncing
#define TDEBOUNCE   (40)
// USB input buffer
#define INBUFSZ     (256)

int main(void){
    char inbuff[INBUFSZ];
    const char *spressed = "Key pressed\n", *sreleased = "Key released\n";
    StartHSE();
    gpio_setup();
    usart_setup(115200);
    USB_setup();
    uint8_t pressed = 0;
    uint32_t Tblink = 0, Tkey = 0; // blink and key pressed time
    while(1){
        USART_flags_t f = usart_process();
        if(f.rxovrfl) usart_sendstr("Rx buffer overflow!\n");
        if(f.txerr) usart_sendstr("Tx error!\n");
        char *str = usart_getline();
        if(str){
            usart_sendstr("Received:\n");
            usart_sendstr(str);
            int l = strlen(str);
            if(str[l-1] != '\n'){
                usart_sendstr("\n(only part of line)\n");
            }
        }
        if(Tms - Tblink > 499){
            LED_TOGG();
            Tblink = Tms;
        }
        if(KEY_PRESSED()){
            if(!pressed){ // new event
                pressed = 1;
                usart_sendstr(spressed);
                USB_putbyte('1'); USB_putbyte('1'); newline();
                USB_sendstr(spressed);
            }
            Tkey = Tms;
        }else{ // key released
            if(pressed && (Tms - Tkey) > TDEBOUNCE){ // wait for debounce
                pressed = 0;
                usart_sendstr(sreleased);
                USB_putbyte('0'); USB_putbyte('0'); newline();
                USB_sendstr(sreleased);
            }
        }
        int l = USB_receivestr(inbuff, INBUFSZ);
        if(l < 0) usart_sendstr("ERROR: USB buffer overflow or string was too long\n");
        else if(l){
            usart_sendstr("USB:\n");
            usart_sendstr(inbuff);
            usart_send("\n", 1);
            USB_sendstr(inbuff);
            newline();
        }
    }
}