#include <avr/io.h>
#include <stdio.h>
#include "lcd.h"

int main(void) {
    char buffer[5];
    
    lcd_init();
    lcd_cursor(false, false);
    // division factor fclk / fadc = 3686 / 200 = 18.4 Kies 32
    // fadc = 3686 / 32 = 115 KHz.
    ADMUX = 0;
    ADCSRA = 1<<ADEN | 1<<ADPS2 | 1<<ADPS0;

    while (1) {
        ADCSRA |= 1<<ADSC | 1<<ADIF;
        while (~ADCSRA & 1<<ADIF);
        
        // 1 stapje = 5 / 1024 = 0.0048828125 V = 4.8828125 mV
        // fout = +/- 2.44 mv. Geef antwoord met 2 cijfers achter de punt
        lcd_home();
        snprintf(buffer, sizeof buffer, "%4.2f", 5.0 * (ADC + 0.5) / 1024);
        lcd_puts(buffer);
    }

    return 0;
}