77. Sleep Modes Operation

The code given below blinks the LED. 

Sam wants the LED always to be OFF. What should be the value of variable x in the code so the LED will always stay OFF?

Code

#include <avr/sleep.h>
#include <avr/interrupt.h>

#define LED 12

ISR(TIMER2_COMPA_vect) {
 
}

void timer2_config(){
  // Configure Timer2 for CTC mode
  TCCR2A = (1 << WGM21); // CTC mode
  TCCR2B = (1 << CS22) | (1 << CS21) | (1 << CS20); // Prescaler 1024
  OCR2A = 255; // Compare value for wake-up interval


// The below line of code generates an Interrupt when the value of Timer2 matches the value of the OCR2A register
  TIMSK2 = (1 << OCIE2A); // Enable Timer2 Compare Match A Interrupt
  sei(); // Enable global interrupts
}

void setup() {
  int x = 0;

  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
 
  timer2_config();
  sleep_enable();
  if(x == 1){
    set_sleep_mode(SLEEP_MODE_IDLE);
    sleep_mode();
  }
  else if(x == 2){
    set_sleep_mode(SLEEP_MODE_PWR_SAVE);
    sleep_mode();
  }
  else if(x == 3){
    set_sleep_mode(SLEEP_MODE_STANDBY);
    sleep_mode();
  }
  else if(x == 4){
    set_sleep_mode(SLEEP_MODE_EXT_STANDBY);
    sleep_mode();
  }
 
  sleep_disable();
 
}

void loop() {
  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
  delay(500);
}