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#define F_CPU 1000000UL

#define F_BAUD  31250UL

#include <inttypes.h>

#include <string.h>

#include <avr/io.h>

#include <util/delay.h>

#include <stdio.h>

static int uart_putchar(char c, FILE *stream);

static int uart_getchar(FILE *stream);

static FILE mystdio = FDEV_SETUP_STREAM(uart_putchar, uart_getchar,

                                         _FDEV_SETUP_RW);

static int

    uart_putchar(char c, FILE *stream)

    {

      loop_until_bit_is_set(UCSRA, UDRE);

      UDR = c;

      return 0;

    }

static int

    uart_getchar(FILE *stream)

    {

      loop_until_bit_is_set(UCSRA, RXC);

      return UDR;

    }

void init(void)

{

  // Setup USART for debug channel

  UCSRB = _BV(RXEN)|_BV(TXEN);

  UBRRL = (F_CPU / 16 / F_BAUD) - 1;

  stdout = &mystdio;

  stdin = &mystdio;

}

int main(void)

{

    init();

    printf("Hello, World!\n");

    return 0;

}