/*
 * 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 "variant.h"
#include <stdio.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 0x02
#define SPI_MODE2 0x01
#define SPI_MODE3 0x03

#define SPI_MODE_MASK 0x03     // 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:
    static byte transfer( byte _data ) ;

    // SPI Configuration methods

    static void attachInterrupt( void ) ;
    static void detachInterrupt( void ) ; // Default

    static void begin( void ) ; // Default
    static void end( void ) ;

    static void setBitOrder( uint8_t ) ;
    static void setDataMode( uint8_t ) ;
    static void setClockDivider( uint8_t ) ;
} ;

extern SPIClass SPI;


#endif