71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _SPI_H_INCLUDED
|
||
|
|
#define _SPI_H_INCLUDED
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <Arduino.h>
|
||
|
|
#include <avr/pgmspace.h>
|
||
|
|
|
||
|
|
#define SPI_CLOCK_DIV4 0x00
|
||
|
|
#define SPI_CLOCK_DIV16 0x01
|
||
|
|
#define SPI_CLOCK_DIV64 0x02
|
||
|
|
#define SPI_CLOCK_DIV128 0x03
|
||
|
|
#define SPI_CLOCK_DIV2 0x04
|
||
|
|
#define SPI_CLOCK_DIV8 0x05
|
||
|
|
#define SPI_CLOCK_DIV32 0x06
|
||
|
|
//#define SPI_CLOCK_DIV64 0x07
|
||
|
|
|
||
|
|
#define SPI_MODE0 0x00
|
||
|
|
#define SPI_MODE1 0x04
|
||
|
|
#define SPI_MODE2 0x08
|
||
|
|
#define SPI_MODE3 0x0C
|
||
|
|
|
||
|
|
#define SPI_MODE_MASK 0x0C // CPOL = bit 3, CPHA = bit 2 on SPCR
|
||
|
|
#define SPI_CLOCK_MASK 0x03 // SPR1 = bit 1, SPR0 = bit 0 on SPCR
|
||
|
|
#define SPI_2XCLOCK_MASK 0x01 // SPI2X = bit 0 on SPSR
|
||
|
|
|
||
|
|
class SPIClass {
|
||
|
|
public:
|
||
|
|
inline static byte transfer(byte _data);
|
||
|
|
|
||
|
|
// SPI Configuration methods
|
||
|
|
|
||
|
|
inline static void attachInterrupt();
|
||
|
|
inline static void detachInterrupt(); // Default
|
||
|
|
|
||
|
|
static void begin(); // Default
|
||
|
|
static void end();
|
||
|
|
|
||
|
|
static void setBitOrder(uint8_t);
|
||
|
|
static void setDataMode(uint8_t);
|
||
|
|
static void setClockDivider(uint8_t);
|
||
|
|
};
|
||
|
|
|
||
|
|
extern SPIClass SPI;
|
||
|
|
|
||
|
|
byte SPIClass::transfer(byte _data) {
|
||
|
|
SPDR = _data;
|
||
|
|
while (!(SPSR & _BV(SPIF)))
|
||
|
|
;
|
||
|
|
return SPDR;
|
||
|
|
}
|
||
|
|
|
||
|
|
void SPIClass::attachInterrupt() {
|
||
|
|
SPCR |= _BV(SPIE);
|
||
|
|
}
|
||
|
|
|
||
|
|
void SPIClass::detachInterrupt() {
|
||
|
|
SPCR &= ~_BV(SPIE);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|