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 ([email protected]) to implement repeated starts
  Modified December 2014 by Ivan Grokhotkov ([email protected]) - esp8266 support
  Modified April 2015 by Hrsto Gochkov ([email protected]) - alternative esp8266 support
  Modified October 2016 by Marcelo Aquino <[email protected]> for Raspberry Pi
*/
 
#ifndef Wire_h
#define Wire_h
 
#if !DOXYGEN
#include <stdint.h>
#include "Stream.h"
#include "BCM.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;
 
public:
    void begin();
    void begin(uint8_t address);
    void begin(int address);
    void end();
    void setClock(uint32_t clock);
 
    void beginTransmission(uint8_t address);
    void beginTransmission(int address);
    uint8_t endTransmission(void);
 
    size_t requestFrom(uint8_t address, size_t size);
    uint8_t requestFrom(uint8_t address, uint8_t quantity);
    uint8_t requestFrom(int address, int quantity);
 
    size_t write(uint8_t data);
    size_t write(const uint8_t *data, size_t quantity);
    int available();
    int read();
    int peek();
    void flush();
 
    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
#endif