#include "avr/interrupt.h"
#include <LiquidCrystal.h> 

LiquidCrystal lcd(7, 6, 5, 4, 3, 2); 
volatile int buttonVariable; 

void setup(void)
{ 

   lcd.begin(16, 2); 
   lcd.print("Incepe experimentul");
   delay(1000);
  
   pinMode(21 ,INPUT_PULLUP); //Vezi ca aici daca nu setezi pinii corespunzatoare butoanelor sa fie INPUT_PULLUP, pot sa ia valori 
   pinMode(20, INPUT_PULLUP); //aiurea la inceput si sa considere ca ceva buton e apasat. 
  //  digitalWrite(20, HIGH); //Daca nu setezi pinii sa fie INPUT_PULLUP, trebuie sa ii setezi tu sa te asiguri ca au valoarea HIGH, adica nu sunt apasati.
  //  digitalWrite(21, HIGH);

   pinMode(13, OUTPUT); // Set pin 13 as output
   digitalWrite(13, HIGH); // Lit up the onboard LED 
   delay(1000);
   EIMSK |= (1 << INT0); // Activate INT0 
   EIMSK |= (1 << INT1); // Activate INT1
   
   EICRA |= (1 << ISC01); // Specify INT0 triggering 
   //behavior: falling edge of the
   EICRA |= (1 << ISC11); // Same behavior for INT1
   sei(); // Global interrupt system activation
   digitalWrite(13, LOW); // Turn off the onboard LED
   lcd.clear(); // Erase the LCD screen
}
void loop()
{
   // If an interrupt was triggered/executed the LCD has to 
   //be erased and the main massage 
   //displayed 
   if(buttonVariable == 1)
   {
   lcd.clear(); // Erase the LCD 
   buttonVariable = 0; // Global variable re-initialized
   }
   delay(1000);
   lcd.setCursor(0,0); // Set the LCD cursor
   lcd.print("Liniste…"); // Display a message
}

// ISR for INT0 (“INT0_vect” is a predefined name (address) 
//for INT0 ISR
ISR(INT0_vect)
{
   digitalWrite(13, !digitalRead(13)); // Change the status 
   //of pin 13
   lcd.setCursor(0,0); // Move the LCD cursor in the top-left 
   //corner
   lcd.print("Intrerupem");// Display message
   lcd.setCursor(0,1);
   lcd.print("ptr stirea zilei");
   buttonVariable = 1;
}

// ISR for INT1 
ISR(INT1_vect)
{
   digitalWrite(13, !digitalRead(13));
   lcd.clear();
   lcd.setCursor(0,0);
   lcd.print("Stirea Doi");
   buttonVariable = 1;
}