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/**************************************************************************//**
* \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)));
}