#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>  
#include <avr/sleep.h>

#define lineTime 1280
int LineCount;

ISR (TIMER1_COMPA_vect) {
    LineCount++;  
  
    if (LineCount==312){
        LineCount = 0;

    }      

    if(LineCount > 305 && LineCount < 309){
        PORTD = 0b01000000;;
        _delay_us(8);
        PORTD = 0b00000000;
    }else{
        PORTD = 0b00000000;
        _delay_us(4);
        PORTD = 0b01000000;
        _delay_us(8);
        PORTD = 0b10000000;

    }
    


    if(LineCount > 100 && LineCount < 150){
        _delay_us(13);

        PORTD = 0b10000000;
        _delay_us(25);
        
    }
    PORTD = 0b01000000;

}
int main(){

      OCR1A = lineTime;     //One PAL line
  
      TCCR1B = (1<<WGM12)|(1<<CS10);     //full speed; clear-on-match
      TCCR1A = 0x00;    //turn off pwm and oc lines
      TIMSK1 = 1<<OCIE1A;        //enable interrupt T1 cmp A
      DDRD=0xC0;        //video out

    PORTD = 0b01000000;

    LineCount = 0;


      sei();
      set_sleep_mode(SLEEP_MODE_IDLE);
      sleep_enable();

    while(1){
        sleep_cpu();
    }

}