Mirda Lizner - tester Zenerek

/*
 * ATTINY13A - clock 1,2MHz
 * PB2 - vstup z delice 1:10
 * PB3 - TM1637-CLK
 * PB4 - TM1637-DIO
 * pouzita knihovna: https://github.com/lpodkalicki/attiny-tm1637-library
 */

#define F_CPU 1200000ul
#include <util/delay.h>
#include <avr/io.h>
#include "tm1637/tm1637.h"

void adc_init();
uint16_t adc_read();

int main(void)
{
    TM1637_init(1/*enable*/, 5/*brightness*/);
    adc_init();

    while (1) {
        uint16_t analog=adc_read();
        uint16_t milivolty  = (uint16_t)(uint32_t)(analog * 1000ul / 1023 * 5);
        TM1637_display_digit(0, milivolty/1000);
        TM1637_display_digit(1, milivolty/100 % 10);
        TM1637_display_digit(2, milivolty/10 % 10);
        TM1637_display_digit(3, milivolty % 10);
        _delay_ms(200);
    }
}

void adc_init()
{
    DIDR0 = (1<<ADC1D); // PB2 ADC1 disable Digital
    ADMUX = (1<<MUX0);  // PB2 select mux
    ADCSRA = (1<<ADEN)|(1<<ADPS1)|(1<<ADPS0);
}

uint16_t adc_read()
{
    ADCSRA |= (1<<ADSC);        // Start konverze
    while(ADCSRA & (1<<ADSC));  // Cekame nez konverze probehne
    return ADC;                 // vratime vysledek
}