Wire.h

/*

  TwoWire.h - TWI/I2C library for Arduino & Wiring

  Copyright (c) 2006 Nicholas Zambetti.  All right reserved.

  This library is free software; you can redistribute it and/or

  modify it under the terms of the GNU Lesser General Public

  License as published by the Free Software Foundation; either

  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public

  License along with this library; if not, write to the Free Software

  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

  Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts

*/

#ifndef TwoWire_h

#define TwoWire_h

#include <inttypes.h>

#include "Stream.h"

#define BUFFER_LENGTH 32

class TwoWire : public Stream

{

  private:

    static uint8_t rxBuffer[];

    static uint8_t rxBufferIndex;

    static uint8_t rxBufferLength;

    static uint8_t txAddress;

    static uint8_t txBuffer[];

    static uint8_t txBufferIndex;

    static uint8_t txBufferLength;

    static uint8_t transmitting;

    static void (*user_onRequest)(void);

    static void (*user_onReceive)(int);

    static void onRequestService(void);

    static void onReceiveService(uint8_t*, int);

  public:

    TwoWire();

    void begin();

    void begin(uint8_t);

    void begin(int);

    void beginTransmission(uint8_t);

    void beginTransmission(int);

    uint8_t endTransmission(void);

    uint8_t endTransmission(uint8_t);

    uint8_t requestFrom(uint8_t, uint8_t);

    uint8_t requestFrom(uint8_t, uint8_t, uint8_t);

    uint8_t requestFrom(int, int);

    uint8_t requestFrom(int, int, int);

    virtual size_t write(uint8_t);

    virtual size_t write(const uint8_t *, size_t);

    virtual int available(void);

    virtual int read(void);

    virtual int peek(void);

  virtual void flush(void);

    void onReceive( void (*)(int) );

    void onRequest( void (*)(void) );

    inline size_t write(unsigned long n) { return write((uint8_t)n); }

    inline size_t write(long n) { return write((uint8_t)n); }

    inline size_t write(unsigned int n) { return write((uint8_t)n); }

    inline size_t write(int n) { return write((uint8_t)n); }

    using Print::write;

};

extern TwoWire Wire;

#endif