L09

#define F_CPU 7372800UL

#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include "lcd.h"

uint8_t s = 0, m = 0, h = 0;
uint8_t modalitet = 0;
uint8_t chooseEditor = 0, edit[4] = {"", "Hours", "Minutes", "Seconds"};

void writeMessage() {
    lcd_clrscr();
    lcd_puts("Hello World!");
}

void writeClock() {
    lcd_clrscr();
    lcd_gotoxy(4,0);
    char time[9];
    time[7] = '0' + s % 10;
    time[6] = '0' + s / 10;
    time[5] = ':';
    time[4] = '0' + m % 10;
    time[3] = '0' + m / 10;
    time[2] = ':';
    time[1] = '0' + h % 10;
    time[0] = '0' + h / 10;
    time[8] = '\0';
    lcd_puts(time);
}

void writeMod() {
    lcd_gotoxy(0,1);
    char mod[3] = {'M', '0' + modalitet, '\0'};
    lcd_puts(mod);
    if (modalitet == 1) {
        lcd_gotoxy(8,1);
        lcd_puts(edit[chooseEditor]);
    } else if (modalitet == 2) {
        lcd_gotoxy(11,1);

    }
}

void writeLCD() {
    if(modalitet == 0) {
        writeMessage();
    } else {
        writeClock();
    }
    writeMod();
}

ISR(TIMER0_COMP_vect) {
    s++;
    if(s == 60) {
        s = 0;
        m++;
        if(m == 60) {
            m = 0;
            h++;
            if(h == 24) {
                h = 0;
            }
        }
    }
    writeLCD();
}

void debounce() {

}

ISR(INT0_vect) {
    modalitet = (modalitet + 1) % 3;
    debounce();
}

int main(void) {
    DDRD = _BV(4);

    DDRA = 0xff;
    DDRB = 0xf0;
    PORTB = _BV(0) | _BV(1) | _BV(2);

    MCUCR = _BV(ISC01);
    GICR = _BV(INT0);

    TCCR0 = _BV(WGM01) | _BV(CS02) | _BV(CS00);
    OCR0 = 71;
    /*
        100 = 7372800 / N(1+x)
        x = (73727 - N) / N
        N = 1024
        x = 71
    */

    TCCR1A = _BV(COM1B0) | _BV(COM1B1) | _BV(WGM10);
    TCCR1B = _BV(WGM12) | _BV(CS10);
    OCR1B = 128;
    TIMSK = _BV(OCIE0);
    sei();

    uint8_t deb = 0;
    lcd_init(LCD_DISP_ON);
    writeLCD();

    while(1) {
        if(!deb)
            deb--;

        if (bit_is_cleared(PINB,0)) {
            deb = 200;
        } else if (bit_is_cleared(PINB,1)) {
        }
    }
}