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

void adc_init() {
	DDRC=0x0; // does not exist but is default?
	ADCSRA = (1<<ADEN)|(1<<ADPS1)|(1<<ADPS2);
	ADMUX = (1<<REFS0);
}
uint16_t adc_read(uint8_t channel) {
    ADMUX &= 0xf0;
    ADMUX |= (channel & 0x0f);
    ADCSRA |= (1<<ADSC);
    while((ADCSRA&(1<<ADIF))==0);
    return ADCL + (ADCH << 8);
}