usart.c

/**
 * \file
 *
 * \brief USART driver
 *
 * Copyright (C) 2011 Atmel Corporation. All rights reserved.
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 * Atmel AVR product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */


#include "usart.h"

/**
 * \defgroup usart_driver_group USART driver
 *
 * The USART driver is used to send or receive characters using USART1.
 *
 * @{
 */

/** \brief Function to get a char from the USART if it is ready.
 *
 * \retval UDR1     Returns USART1 data register
 */
uint8_t usart1_getchar(void)
{
	// Wait for incomming data
	while (!(UCSR1A & (1 << RXC1)));

	// Return the read data
	return UDR1;
}

/** \brief Function to transmit a char using USART1 if it is ready.
 *
 * \param c     Variable used to transmit a character using USART1
 *
 */
int usart1_putchar(int c)
{
	UCSR1A |= (1 << TXC1);
	if (c == '\n') {
		putchar('\r');
	}
	// Wait for empty transmit buffer
	while (!(UCSR1A & (1 << UDRE1)));

	// Start transmittion
	return (UDR1 = c);
}

 //! @}