analog_read.c


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#include <avr/io.h>
#include "pins.h"

void init_adc() {
  PRR = 0;
  DDRF = 0;

  //enable ADC0 input, refrence is AREF (wire to 5v)
  ADMUX = 0b01100000; 

  //enable adc, disable interrupts, clear pending reading, slowest speed
  ADCSRA = 0b10000111; 
}

uint8_t analog_read_8bit() {
  ADCSRA |= (1 << ADSC);
  while(ADCSRA & (1 << ADSC));
  return ADCH;
}