avr_demo/hello_uart/main.c

/*
 * Test how to use uart stuff as an outside library. Redirects stdout
 * to uart.
 * 
 * Led at Arduino digital 13 (PORTB5). Cause we all love blinken leds!
 *
 * To compile and upload run: make clean; make; make program;
 * Connect to serial with: screen /dev/tty.usbserial-* 9600
 *
 * Copyright 2011 Mika Tuupola
 *
 * Licensed under the MIT license:
 *   http://www.opensource.org/licenses/mit-license.php
 *
 */
 
#ifndef F_CPU
#define F_CPU 16000000UL
#endif

//#include <stdlib.h>
#include <avr/io.h>
#include <stdio.h>
#include <util/delay.h>

#include "main.h"
#include "uart.h"

int main(void) {    

    uart_init();
    stdout = &uart_output;
    stdin  = &uart_input;
                
    while (1) {
        /* Blink led by toggling state of PORTB5 (Arduino digital 13). */
        PORTB ^= _BV(PORTB5);
        
        puts("Hello world!");
        
        _delay_ms(500);    
    }
    
    return 0;

}