#define set0(r,b) r&= ~(1<<b)
#define set1(r,b) r |= 1<<b
#define test(r,b) ( r&(1<<b) )

void setup() {

  Serial.begin(9600);

  //nastavenie zeleneho tlacitka
  set0(DDRD, 7); //input
  set1(PORTD, 7); //high

  //nastavenie cervenho tlacitka
  set0(DDRB, 3);
  set1(PORTB, 3);

  //nastavenie modreho tlacitka
  set0(DDRC, A3);
  set1(PORTC, A3);

  
  //SETUP PRERUSENIA PRE ZELENE
  set1(PCICR, PCIE2); //PCIR zapinanie celeho registra. registre su rozdelene na 3 casti
                      //PCIE2 je cast s pcint od 23 do 16
  set1(SREG, 7);  //dovolovanie pouzivat prerusenia, staci spravit raz, je to globalne
  set1(PCMSK2, PCINT23); //zapina konkretny pin (v tomto pripade pcint23)

  //prerusenie pre cervene
  set1(PCICR, PCIE0);
  set1(SREG, 11);
  set1(PCMSK0, PCINT3);

  //nastavenie prerusenia pre modre
  set1(PCICR, PCIE1);
  set1(SREG, A3);
  set1(PCMSK1, PCINT11);
}

int cislo = 0;

void loop() {
  // put your main code here, to run repeatedly:

}

ISR(PCINT2_vect) //vector prerusenie pre PCIE2 tj. zelene tlacitko
{
  if(test(PIND, 7) ==0 )
  {
    cislo++;
    Serial.println(cislo);
  }
}

ISR(PCINT0_vect) //cervene prerusenie
{
  if(test(PINB, 3) == 0 )
  {
    cislo--;
    Serial.println(cislo);
  }
}

ISR(PCINT1_vect) //moere prerusenie
{
  if(test(PINC, A3) == 0 )
  {
    cislo=0;
    Serial.println(cislo);
  }
}