#include <LiquidCrystal_I2C.h>

int cislo = 0;
bool boolik = true;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print(cislo);


   DDRD &= ~(1<<2);
   PORTD |= 1<<2; 
   EIMSK |= 1<<INT0;
   SREG |= 1<<7; // povolenie celkovo interruptov
   EICRA |= 1<<ISC01; // nastevenie reakcie (rising/falling)
   EICRA &= ~(1<<ISC00); // nastevenie reakcie (rising/falling)

   DDRD &= ~(1<<3);
   PORTD |= 1<<3; 
   EIMSK |= 1<<INT1; //zapnutie interrupt na porte 2
   EICRA |= 1<<ISC11; // nastevenie reakcie (rising/falling)
   EICRA &= ~(1<<ISC10); // nastevenie reakcie (rising/falling)
}

void loop() {
  if(boolik)
  {
  gago();
  boolik = false;
  }
}

ISR(INT1_vect)
{
  cislo++;
  boolik = true;
}


ISR(INT0_vect)
{
  cislo--;
  boolik = true;
}

void gago()
{
  lcd.setCursor(0,0);
  lcd.print("   ");
  lcd.setCursor(0,0);
  lcd.print(cislo);
}