uart.c

/*
 *  Copyright (c) 2009 Braiden Kindt
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without
 *  restriction, including without limitation the rights to use,
 *  copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following
 *  conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *  OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <avr/io.h>
#include <avr/pgmspace.h>
#include "uart.h"

void uart_init() {
#include <util/setbaud.h>
	UBRR0H = UBRRH_VALUE;
	UBRR0L = UBRRL_VALUE;
#if USE_2X
	UCSR0A |= _BV(U2X0);
#else
	UCSR0A &= ~_BV(U2X0);
#endif
	UCSR0B = _BV(RXEN0) | _BV(TXEN0);
	UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
}

void uart_send_P(PGM_P str)
{
	char c;
	do {
		c = pgm_read_byte(str++);
		uart_send_char(c);
	} while(c);
}

void uart_send(char *c) {
	for (; *c; uart_send_char(*c++));
}

void uart_send_char(char c) {
	if (c == '\n') uart_send_char('\r');
	loop_until_bit_is_set(UCSR0A, UDRE0);
	UDR0 = c;
}