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Adding SPI library and revising Ethernet library (Christian Maglie).

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This commit is contained in:
David A. Mellis
2010-08-02 18:59:44 +00:00
parent 78e093b482
commit e24b135755
24 changed files with 1429 additions and 2524 deletions
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94
libraries/SPI/SPI.cpp Normal file
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/*
* Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
* SPI Master library for arduino.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of either the GNU General Public License version 2
* or the GNU Lesser General Public License version 2.1, both as
* published by the Free Software Foundation.
*/
#include "SPI.h"
SPIClass SPI;
SPIClass::SPIClass()
{
#if defined(__AVR_ATmega1280__)
// PBx
const static byte SS = 0;
const static byte MOSI = 2;
const static byte MISO = 3;
const static byte SCK = 1;
#else
// PBx
const static byte SS = 2;
const static byte MOSI = 3;
const static byte MISO = 4;
const static byte SCK = 5;
#endif
// Set direction register for SCK and MOSI pin.
// MISO pin automatically overrides to INPUT.
// When the SS pin is set as OUTPUT, it can be used as
// a general purpose output port (it doesn't influence
// SPI operations).
DDRB |= _BV(SCK) | _BV(MOSI) | _BV(SS);
PORTB &= ~(_BV(SCK) | _BV(MOSI) | _BV(SS));
SPCR = _BV(SPE) | _BV(MSTR);
// Warning: if the SS pin ever becomes a LOW INPUT then SPI
// automatically switches to Slave, so the data direction of
// the SS pin MUST be kept as OUTPUT.
SPCR = _BV(SPE) | _BV(MSTR);
}
void SPIClass::setDataOrder(SPIDataOrder _d)
{
if (_d == SPI_DataOrder_LSB)
SPCR |= _BV(DORD); // LSB
else
SPCR &= ~_BV(DORD); // MSB
}
void SPIClass::setSPIMode(SPIMode _d)
{
switch (_d) {
case SPI_Mode_SampleRising:
SPCR &= ~(_BV(CPOL) | _BV(CPHA));
break;
case SPI_Mode_SetupRising:
SPCR &= ~_BV(CPOL);
SPCR |= _BV(CPHA);
break;
case SPI_Mode_SampleFalling:
SPCR &= ~_BV(CPHA);
SPCR |= _BV(CPOL);
break;
case SPI_Mode_SetupFalling:
SPCR |= _BV(CPOL) | _BV(CPHA);
break;
}
}
void SPIClass::setClockDivider(SPIClockDivider _d)
{
switch (_d) {
case SPI_ClkDiv_4:
SPCR &= ~(_BV(SPR1) | _BV(SPR0));
break;
case SPI_ClkDiv_16:
SPCR &= ~_BV(SPR1);
SPCR |= _BV(SPR0);
break;
case SPI_ClkDiv_64:
SPCR |= _BV(SPR1);
SPCR &= ~_BV(SPR0);
break;
case SPI_ClkDiv_128:
SPCR |= _BV(SPR1) | _BV(SPR0);
break;
}
}