#include <arduino.h>
#include <stdlib.h>
#include <stdbool.h>
#include <inttypes.h>
#include <avr/pgmspace.h>        // put var to program memory
#include <avr/io.h>
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include <string.h>

#define LEDPIN A0
#define TIMER_PRESCALER 64
#define DCC_BIT_SAMPLE_PERIOD (F_CPU * 80L / TIMER_PRESCALER / 1000000L)

void zack()
{
  digitalWrite(LEDPIN,0);
  OCR0B = TCNT0 + DCC_BIT_SAMPLE_PERIOD ;
  TIMSK0 |= 1<<OCIE0B;  // Enable Timer0 Compare Match B Interrupt
  TIFR0  = (1<<OCF0B);   // Clear  Timer0 Compare Match B Flag 
}

ISR(TIMER0_COMPB_vect)
{
}

void setup()
{
  pinMode (LEDPIN, OUTPUT);
  digitalWrite(LEDPIN, HIGH);
  delay(1000);
  attachInterrupt(0, zack, RISING);
}

void loop ()
{
}