Ultrasonic Sensor freaking me out:(

CODE:
#define F_CPU 11059200UL
#define USART_BAUDRATE 9600	// Baud Rate value
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)

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

volatile uint32_t result;
volatile int capture_pulse;
int start_timer;

void init_int()
{
	cli();
	MCUCR |= (0<<ISC11)|(1<<ISC10);//|(1<<ISC01)|(0<<ISC00);
	GICR |=(1<<INT1);//|(1<<INT0);
	sei();
}

ISR(INT1_vect)
{
	if ((PIND & 0x08) == 0x08)
	{
		
	    // initialize overflow counter variable
	    result = 0;

		TCCR0 |= (0<<CS02)|(0<<CS01)|(1<<CS00); // no Prescaler //F_CPU/8

		// initialize counter
	    TCNT0 = 0;
  
	    // enable overflow interrupt
	    TIMSK |= (1 << TOIE0);
  
	}
	else
	{
	
		TCCR0 &= ~(1<<CS00);	//stop timer
		result += TCNT0;
		//TCNT0 = 0;				// reset timer
		capture_pulse=1;
	}
}

ISR(TIMER0_OVF_vect)
{
	result += 255;	//add overflow count of TCNT0
}

void USARTInit()
{
	//Set Baud rate
	UBRRL = BAUD_PRESCALE; //ubrr_value;
	UBRRH = BAUD_PRESCALE; //(ubrr_value>>8);
	//Set Frame Format
	UCSRC=(1<<URSEL)|(3<<UCSZ0);
	//	UCSRC |= (1 << URSEL) | (1<<USBS) | (1 << UCSZ0) | (1 << UCSZ1);
	// Use 8-bit character sizes
	//Enable The receiver and transmitter
	UCSRB=(1<<TXEN);//|(1<<RXEN);
	//UCSRB |= (1 << RXCIE); // Set receive interrupt ON
	UBRRL = BAUD_PRESCALE;
	// Load lower 8-bits of the baud rate value into the low byte of the UBRR register
	UBRRH = (BAUD_PRESCALE >> 8); // Load upper 8-bits of the baud rate value..
	// into the high byte of the UBRR register
}


void USARTWriteChar(char data)
{
	//Wait untill the transmitter is ready
	while(!(UCSRA & (1<<UDRE)))
	{
		//Do nothing
	}
	//Now write the data to USART buffer
	UDR=data;
}

// Send string through USART 
void usart_send_string(char *str)
{
	int len,j;
	//char count[3];
	len = strlen(str);
	for (j=0;j<len;j++)
		{
		USARTWriteChar(str[j]);
		//_delay_ms(10);
		}
	//return len;
}

void Trg() 
{
	PORTB &= ~(1 << PB0);
	_delay_us(10);
	PORTB |= (1 << PB0);
	_delay_us(12);
	PORTB &= ~(1 << PB0);
	//_delay_us(10);
}

int main(void)
{
	int i;
	result=0;
	char value[7];
	int distance = 0;

	DDRB=0b00000001;

	USARTInit();
	init_int();
	DDRD=0x00;    

	
	while(1)
	{
		capture_pulse=0;
		int j=0; //temporary variable
		Trg();	

		while(!capture_pulse);		
			USARTWriteChar(45);	
			
			// calculate duration
			distance = (17013.0/F_CPU)* (float)result;
	 		// dist = duration * speed of sound * 1/2
			// dist in cm = duration in s * 340.26 * 100 * 1/2
			// = 17013*duration
			//distance = 17013.0 * duration;
			//distance=result;
			for (i=0;i<=5;i++)
			{
				j=distance%10;	//extraction LSD of TCNT1
				distance=distance/10;	
				value[5-i]=48+j;		//converting decimal to ASCII
				//j=0;//USARTWriteChar(value);
			}
			value[6] = '\0';
			usart_send_string(value);
			distance = 0;
	_delay_ms(1000);
	}
}