/*
 * UART test.c
 *
 * Created: 30-Jun-16 9:48:05 PM
 * Author : Lan
 */
#define F_CPU 506880 // internal fuses set to 8mhz on internal RC oscillator
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>



#define BAUD 9600
#define MYUBRR F_CPU/16/BAUD-1


void USART_Init( unsigned int baud )
{
	/* Set baud rate */
	UBRRH = (unsigned char)(baud>>8);
	UBRRL = (unsigned char)baud;
	/* Enable receiver and transmitter */
	UCSRB = (1<<RXEN)|(1<<TXEN);
	/* Set frame format: 8data, 2stop bit(USBS bit) */
	UCSRC = (1<<USBS)|(3<<UCSZ0);
}

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

unsigned char USART_Receive( void )
{
	/* Wait for data to be received */
	while ( !(UCSRA & (1<<RXC)) )
	;
	/* Get and return received data from buffer */
	return UDR;
}


int main(void)
{
	USART_Init(MYUBRR);
	char A;
    /* Replace with your application code */
    while (1)
    {
		USART_Transmit(0xAA);
		A = USART_Receive();
		USART_Transmit(A);
    }
}