app.c

AVR Devolpment Board

#include "avr/io.h"
#include "avr/interrupt.h"

/* FCPU : 8M */
/* Function : When transmit the data receive */

#define BAUD  38400
#define UBRR  (F_CPU/16/BAUD-1)


void UART_Init(void)
{
	UCSRA = 0x00;
	UCSRB = (1<<RXCIE)|(1<<RXEN)|(1<<TXEN);
	UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);
	UBRRH = UBRR>>8;
	UBRRL = UBRR&0xFF;
	DDRD |= (1<<PD1)|(0<<PD0);
	PORTD|= (1<<PD1)|(1<<PD0);
}

void UART_PutChar(char c)
{
	while(!(UCSRA&(1<<UDRE)));
	UDR    = c;
}

ISR( SIG_UART_RECV )
{
	unsigned char data;
	while(!(UCSRA&(1<<RXC)));
	data=UDR;
	UART_PutChar(data);
}


int main(void)
{
	UART_Init();
	sei();
	while(1)
	{
		;
	}
	return 0;
}