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/*
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 * Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
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 * SPI Master library for arduino.
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 *
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 * This file is free software; you can redistribute it and/or modify
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 * it under the terms of either the GNU General Public License version 2
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 * or the GNU Lesser General Public License version 2.1, both as
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 * published by the Free Software Foundation.
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 */
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#ifndef _SPI_H_INCLUDED
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#define _SPI_H_INCLUDED
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#include <stdio.h>
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#include <Arduino.h>
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#include <avr/pgmspace.h>
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#define SPI_CLOCK_DIV4 0x00
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#define SPI_CLOCK_DIV16 0x01
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#define SPI_CLOCK_DIV64 0x02
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#define SPI_CLOCK_DIV128 0x03
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#define SPI_CLOCK_DIV2 0x04
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#define SPI_CLOCK_DIV8 0x05
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#define SPI_CLOCK_DIV32 0x06
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//#define SPI_CLOCK_DIV64 0x07
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#define SPI_MODE0 0x00
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#define SPI_MODE1 0x04
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#define SPI_MODE2 0x08
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#define SPI_MODE3 0x0C
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#define SPI_MODE_MASK 0x0C  // CPOL = bit 3, CPHA = bit 2 on SPCR
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#define SPI_CLOCK_MASK 0x03  // SPR1 = bit 1, SPR0 = bit 0 on SPCR
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#define SPI_2XCLOCK_MASK 0x01  // SPI2X = bit 0 on SPSR
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class SPIClass {
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public:
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  inline static byte transfer(byte _data);
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  // SPI Configuration methods
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  inline static void attachInterrupt();
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  inline static void detachInterrupt(); // Default
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  static void begin(); // Default
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  static void end();
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  static void setBitOrder(uint8_t);
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  static void setDataMode(uint8_t);
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  static void setClockDivider(uint8_t);
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};
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extern SPIClass SPI;
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byte SPIClass::transfer(byte _data) {
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  SPDR = _data;
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  while (!(SPSR & _BV(SPIF)))
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    ;
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  return SPDR;
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}
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void SPIClass::attachInterrupt() {
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  SPCR |= _BV(SPIE);
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}
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void SPIClass::detachInterrupt() {
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  SPCR &= ~_BV(SPIE);
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}
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#endif