UART_TEST.c

#include <Arduino.h>
#include <avr/io.h>
#include <util/delay.h>
#include "lcd.h"
#include "keypad.h"


#ifndef F_CPU
#define F_CPU 16000000UL
#endif

#ifndef BAUD
#define BAUD 9600
#endif

#include <util/setbaud.h>


void uart_init(void) {

	UBRR0H = UBRRH_VALUE;
	UBRR0L = UBRRL_VALUE;



#if USE_2X
	UCSR0A |= _BV(U2X0);
#else
	UCSR0A &= ~(_BV(U2X0));
#endif



	UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */
	UCSR0B = _BV(RXEN0) | _BV(TXEN0);   /* Enable RX and TX */

}



void uart_putchar(char c) {

	loop_until_bit_is_set(UCSR0A, UDRE0);
	UDR0 = c;

}



char uart_getchar() {

	loop_until_bit_is_set(UCSR0A, RXC0);
	return UDR0;

}

void transmit() {
	uart_putchar('A');
	_delay_ms(50);
}



int main(void) {

	char myChar='a';
	pinMode(13,OUTPUT);

//init_lcd();


	while(1) {

		myChar = uart_getchar();

		if(myChar == 'A') {
			digitalWrite(13,HIGH);
			_delay_ms(500);
			digitalWrite(13,LOW);
		}



//       transmit();

	}

}