#include <avr/io.h>
#include <stdio.h>
 
#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 */
}
 
int uart_putchar (char c, FILE *stream)
{
    loop_until_bit_is_set(UCSR0A, UDRE0); /* Wait until data register empty. */
    UDR0 = c;
    return 0;
}
 
FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
 
int main ()
{
    uart_init();
    stdout = &uart_output;
 
    printf("Hello\n");
}
 

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