You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
62 lines
1.5 KiB
62 lines
1.5 KiB
/*
|
|
* 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 "pins_arduino.h"
|
|
#include "SPI.h"
|
|
|
|
SPIClass SPI;
|
|
|
|
void SPIClass::begin() {
|
|
// 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).
|
|
|
|
pinMode(SCK, OUTPUT);
|
|
pinMode(MOSI, OUTPUT);
|
|
pinMode(SS, OUTPUT);
|
|
|
|
digitalWrite(SCK, LOW);
|
|
digitalWrite(MOSI, LOW);
|
|
digitalWrite(SS, HIGH);
|
|
|
|
// 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(MSTR);
|
|
SPCR |= _BV(SPE);
|
|
}
|
|
|
|
void SPIClass::end() {
|
|
SPCR &= ~_BV(SPE);
|
|
}
|
|
|
|
void SPIClass::setBitOrder(uint8_t bitOrder)
|
|
{
|
|
if(bitOrder == LSBFIRST) {
|
|
SPCR |= _BV(DORD);
|
|
} else {
|
|
SPCR &= ~(_BV(DORD));
|
|
}
|
|
}
|
|
|
|
void SPIClass::setDataMode(uint8_t mode)
|
|
{
|
|
SPCR = (SPCR & ~SPI_MODE_MASK) | mode;
|
|
}
|
|
|
|
void SPIClass::setClockDivider(uint8_t rate)
|
|
{
|
|
SPCR = (SPCR & ~SPI_CLOCK_MASK) | (rate & SPI_CLOCK_MASK);
|
|
SPSR = (SPSR & ~SPI_2XCLOCK_MASK) | ((rate >> 2) & SPI_2XCLOCK_MASK);
|
|
}
|
|
|