/*
 * 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:
	SPIClass(Spi *_spi, uint32_t _id, void(*_initCb)(void));

	byte transfer(byte _data);

	// SPI Configuration methods

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

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

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

  private:
	Spi *spi;
	uint32_t id, divider, mode;
	void (*initCb)(void);
};

#if SPI_INTERFACES_COUNT > 0
extern SPIClass SPI0;
#endif

#endif