#include <LiquidCrystal_I2C.h>

// (R & (1<<nieco)) ==1<<b
// PINB
boolean test1=false;
boolean test2=false;
int cislo=0;
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,20,4);
void setup() {

 Serial.begin(9600);

  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);

  lcd.println("Zacni klikat (0-10)");

  DDRB |=1<<3;
  DDRB &=~(1<<0);
  DDRB &=~(1<<1);
  PORTB |=1<<0;
  PORTB |=1<<1;
}

void loop() {

if((PINB&(1<<0)) !=0 && test1 != true){
  test1=true;
}

if((PINB&(1<<0)) ==0 && test1 == true){
  test1=false;
  lcd.clear();
  plus();
  lcd.println(cislo);
}

if((PINB&(1<<1)) !=0 && test2 != true){
  test2=true;
}

if((PINB&(1<<1)) ==0 && test2 == true){
  test2=false;
  lcd.clear();
  minus();
  lcd.println(cislo);
}

}


void plus(){
  PORTB |=1<<0;
  delay(2);
  PORTB &=~(1<<0);
  delay(2);

  if(cislo<11){
    cislo++;
    Serial.println(cislo);
  }
}

void minus(){
  PORTB |=1<<1;
  delay(2);
  PORTB &=~(1<<1);
  delay(2);

  if(cislo>0){
    cislo--;
    Serial.println(cislo);
  }
}