SoftI2C.h

/*
 * Copyright (C) 2012 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef SoftI2C_h
#define SoftI2C_h

#include "I2CMaster.h"

class SoftI2C : public I2CMaster {
public:
    SoftI2C(uint8_t dataPin, uint8_t clockPin);

    unsigned int maxTransferSize() const;

    void startWrite(unsigned int address);
    void write(uint8_t value);
    bool endWrite();

    bool startRead(unsigned int address, unsigned int count);
    unsigned int available();
    uint8_t read();

private:
    uint8_t _dataPin;
    uint8_t _clockPin;
    bool started;
    bool acked;
    bool inWrite;
    unsigned int readCount;

    void start();
    void stop();
    void writeBit(bool bit);
    bool readBit();
};

#endif