86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
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/*
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TwoWire.h - TWI/I2C library for Arduino & Wiring
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Copyright (c) 2006 Nicholas Zambetti. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
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*/
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#ifndef TwoWire_h
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#define TwoWire_h
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#include <inttypes.h>
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#include "Stream.h"
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#define BUFFER_LENGTH 32
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// WIRE_HAS_END means Wire has end()
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#define WIRE_HAS_END 1
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class TwoWire : public Stream
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{
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private:
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static uint8_t rxBuffer[];
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static uint8_t rxBufferIndex;
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static uint8_t rxBufferLength;
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static uint8_t txAddress;
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static uint8_t txBuffer[];
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static uint8_t txBufferIndex;
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static uint8_t txBufferLength;
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static uint8_t transmitting;
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static void (*user_onRequest)(void);
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static void (*user_onReceive)(int);
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static void onRequestService(void);
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static void onReceiveService(uint8_t*, int);
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public:
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TwoWire();
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void begin();
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void begin(uint8_t);
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void begin(int);
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void end();
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void setClock(uint32_t);
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void beginTransmission(uint8_t);
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void beginTransmission(int);
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uint8_t endTransmission(void);
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uint8_t endTransmission(uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t, uint32_t, uint8_t, uint8_t);
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uint8_t requestFrom(int, int);
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uint8_t requestFrom(int, int, int);
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virtual size_t write(uint8_t);
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virtual size_t write(const uint8_t *, size_t);
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virtual int available(void);
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virtual int read(void);
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virtual int peek(void);
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virtual void flush(void);
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void onReceive( void (*)(int) );
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void onRequest( void (*)(void) );
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inline size_t write(unsigned long n) { return write((uint8_t)n); }
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inline size_t write(long n) { return write((uint8_t)n); }
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inline size_t write(unsigned int n) { return write((uint8_t)n); }
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inline size_t write(int n) { return write((uint8_t)n); }
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using Print::write;
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};
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extern TwoWire Wire;
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#endif
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