#define F_CPU 1000000UL

#include <avr/signal.h>
#include <avr/interrupt.h>
#include <util/delay.h>

int x=0;
uint8_t led[4];

//define times for start and end of signal
uint16_t rising, falling;

//this function sleeps s seconds (if F_CPU is set to frequency of processor)
void sleep_sec(uint8_t s)
{
  uint8_t i;
  while (s--) for (i = 0; i < 100; i++) _delay_ms(10);
}

//this function sleeps s micro seconds (if F_CPU is set to frequency of processor)
void sleep_usec(uint8_t s)
{
  //uint8_t i;
  while (s--) _delay_us(1);
}

//Timer1 capture interrupt service subroutine
ISR(TIMER1_CAPT_vect)
{
	/*This subroutine checks was it start of pulse (rising edge)
	or was it end (fallingedge)and performs required operations*/

	if ((bit_is_set(PIND, 6))){ //if high level

	//save start time
	rising=ICR1;
	led[0]=ICR1H;
	led[1]=ICR1L;
	
	//set to trigger on falling edge
	TCCR1B = _BV(ICNC1)|_BV(CS10);

	//DDRB = 0b11000000;
	//PORTB = 0b10000000;


}else{

	//save falling time
	falling=ICR1;
	led[2]=ICR1H;
	led[3]=ICR1L;

    //rising edge triggers next
	TCCR1B = _BV(ICNC1)|_BV(CS10)|_BV(ICES1);
	
	DDRB = 0b00010000;
	PORTB = 0b00000000;
	sleep_sec(1);

	int leda = 0b00000000;
	//int led2 = 0b00000000;
	leda = falling - rising;
	leda /=8;
	leda /=58;

	DDRB = 0xFF;
	PORTB = (uint8_t)led;//0b01010101;
	sleep_sec(1);


	PORTB = led[0];
	sleep_sec(7);
	PORTB = led[1];
	sleep_sec(7);
	PORTB = led[2];
	sleep_sec(7);
	PORTB = led[3];
	sleep_sec(7);
  	}	
}

ISR(INT0_vect)
{
	DDRB = 0b00001111;
	PORTB = 0b00001010;
	//sleep_sec(3);
	//PORTB = 0b01010100;
	sleep_sec(1);

	//DDRB = 0b0000011;
	PORTB =0b00000000;
	//sleep_usec(13);
	//PORTB = 0b00101000;

}

void pulse(){
	DDRD = 0b00000001;
	PORTD= 0b00000001;
	asm volatile(
	"ldi r16, 31\n\t"
	"loop: dec r16\n\t"
	"brne loop\n\t"
	);
	PORTD= 0b00000000;
}

int main()
{

	//MCUCR = _BV(ISC00);//|_BV(ISC01);//int0 interrupt
	//GICR = _BV(INT0); //int0 interrupt
	
	TIMSK = _BV(TICIE1);//|_BV(TOIE1);
  	TCCR1B = _BV(CS10)|_BV(ICES1);//|_BV(ICNC1)
    sei();
	pulse();
	
  	while(1);	
}