#include <io.h>
#include <interrupt.h>
#include <util/delay.h>
#include <stdio.h>

void USART_Transmit( unsigned char data);
void USART_Init( );
void Move_interrupts(void);
void hwInit(void);
void CLOCK_init(void);

int a;

ISR(INT0_vect)
{
	USART_Transmit(a++);
}

void main(void)
{
	hwInit();

	Move_interrupts();

	sei();
	while (1);
}

void hwInit()
{
    USART_Init();
	
	DDRD	=	(0<<DDD0);
	
	CLOCK_init();
}

void CLOCK_init(void)
{
	TCCR1A=0x00;
	TCCR1B=0x01;

	TCNT1H=0x00;
	TCNT1L=0x00;
}

void USART_Transmit( unsigned char data )
{
	/* Wait for empty transmit buffer */
	while ( !( UCSR1A & (1<<UDRE1)) );
	/* Put data into buffer, sends the data */
	UDR1 = data;
}

void USART_Init()
{
	UBRR1H = 0x00;	
	UBRR1L = 0x33;
	/* Set baud rate */
	/* Enable receiver and transmitter */
	UCSR1B = (1<<RXEN1)|(1<<TXEN1);
	/* Set frame format: 8data, 2stop bit */
	UCSR1C = (1<<USBS1)|(3<<UCSZ10);
}

void Move_interrupts(void)
{
	EICRA	=	0b00000010;
	EIMSK	=	0b00000001;
}