Subversion Repositories idreammicro-avr

/**************************************************************************//**
 * \brief SPI library
 * \author Copyright (C) 2011  Julien Le Sech - www.idreammicro.com
 * \version 1.0
 * \date 20110315
 *
 * This file is part of the iDreamMicro library.
 *
 * This library is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see http://www.gnu.org/licenses/
 ******************************************************************************/

/**************************************************************************//**
 * \file spi_master.c
 ******************************************************************************/

/******************************************************************************
 * Header file inclusions.
 ******************************************************************************/

#include <spi/spi.h>

#include <useful/bits.h>

#include <avr/io.h>

#include <stdint.h>

#if defined (__AVR_ATmega128__)
    #include "../include/spi_atmega128.h"
#elif defined (__AVR_ATmega328P__) || defined (__AVR_ATmega328__)
    #include "../include/spi_atmega328.h"
#elif defined (__AVR_ATmega2560__)
    #include "../include/spi_atmega2560.h"
#endif

/******************************************************************************
 * Public function definitions.
 ******************************************************************************/

/**************************************************************************//**
 * \fn void spi_master__initialize(void)
 *
 * \brief Initialize SPI in master mode.
 ******************************************************************************/
void
spi_master__initialize
(
    void
){
    // Configure pins.
    DDR_SPI |= _BV(DD_MOSI) | _BV(DD_SCK);

    // Enable SPI and set master mode.
    SPCR = _BV(SPE) | _BV(MSTR);
}

/**************************************************************************//**
 * \fn void spi_master__transmit(uint8_t data)
 *
 * \brief Transmit data.
 *
 * \param   data    Data to transmit.
 ******************************************************************************/
void
spi_master__transmit
(
    uint8_t data
){
    // Write data to SPI data register.
    SPDR = data;

    // Wait for transmission complete.
    while (!(SPSR & (1 << SPIF)));
}