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spi.cpp
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spi.cpp
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/**
* Copyright (c) 2011 panStamp <contact@panstamp.com>
*
* This file is part of the panStamp project.
*
* panStamp 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
* any later version.
*
* panStamp 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 panStamp; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
*
* Author: Daniel Berenguer
* Creation date: 03/03/2011
*/
#include "spi.h"
/**
* init
*
* SPI initialization
*/
void SPI::init()
{
digitalWrite(SPI_SS, HIGH);
// Configure SPI pins
pinMode(SPI_SS, OUTPUT);
pinMode(SPI_MOSI, OUTPUT);
pinMode(SPI_MISO, INPUT);
pinMode(SPI_SCK, OUTPUT);
digitalWrite(SPI_SCK, HIGH);
digitalWrite(SPI_MOSI, LOW);
// SPI speed = clk/4
SPCR = _BV(SPE) | _BV(MSTR);
}
/**
* send
*
* Send byte via SPI
*
* 'value' Value to be sent
*
* Return:
* Response received from SPI slave
*/
byte SPI::send(byte value)
{
SPDR = value; // Transfer byte via SPI
wait_Spi(); // Wait until SPI operation is terminated
return SPDR;
}