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/*
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
Modified 2020 by Greyson Christoforo (grey@christoforo.net) to implement timeouts
*/
#ifndef TwoWire_h
#define TwoWire_h
#include <inttypes.h>
#include "Stream.h"
#define BUFFER_LENGTH 32
// WIRE_HAS_END means Wire has end()
#define WIRE_HAS_END 1
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();
virtual void begin();
virtual void begin(uint8_t);
virtual void begin(int);
virtual void end();
virtual void setClock(uint32_t);
virtual void setWireTimeout(uint32_t timeout = 25000, bool reset_with_timeout = false);
virtual bool getWireTimeoutFlag(void);
virtual void clearWireTimeoutFlag(void);
virtual void beginTransmission(uint8_t);
virtual void beginTransmission(int);
virtual uint8_t endTransmission(void);
virtual uint8_t endTransmission(uint8_t);
virtual uint8_t requestFrom(uint8_t, uint8_t);
virtual uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
virtual uint8_t requestFrom(uint8_t, uint8_t, uint32_t, uint8_t, uint8_t);
virtual uint8_t requestFrom(int, int);
virtual 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);
virtual void onReceive( void (*)(int) );
virtual 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
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