#define F_CPU 16000000UL

#define BAUD 9600

#include <avr/io.h>

#include "util/delay.h"

#include "avr/interrupt.h"

char msg;

int main(void)

{

sei();

UBRRH = 0;

UBRRL = 103;

DDRD |= 0x1;

UCSRA |= 0;

UCSRB |= (1<<TXEN)| (1<<RXEN) | (1<<RXCIE);

UCSRC |= (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0);

/* Replace with your application code */

while (1)

{

_delay_ms(500);

while((UCSRA &(1<<UDRE)) == 0);

UDR = msg;

}

}

ISR(USART_RXC_vect){

msg = UDR;

}