#include <avr/interrupt.h>
#include <avr/signal.h>
#include <avr/pgmspace.h> 
#include <avr/delay.h>
#include <inttypes.h>

SIGNAL(SIG_UART_TRANS)
{
	long i;
 	for (i=0;i<50000;i++);//delay for a while
        UDR='b';
}
void UARTInit(void)
{
        // Initializing UART:
        outp(BV(RXCIE)|BV(TXCIE)|BV(RXEN)|BV(TXEN),UCR); 
        // Setting the control register
        outp(0x17, UBRR);  //Baudrate 9600 with onboard 
                           //oscillator at 3.68MHz 
        sei(); // enabling global interrupts
}

int main(void)
{
        UARTInit();  
        uint8_t data =0;
        UDR='a'; //load 'a' into the UDR
	while(1);
}