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123 pfowler 1 
#ifndef wire_h
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#define wire_h
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#define	MAX_BUFFER 4
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void i2c_master(void);
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void i2c_slave(uint8_t address);
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void i2c_beginTransmission(uint8_t address);
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uint8_t i2c_endTransmission(uint8_t sentStop);
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uint8_t i2c_writeByte(uint8_t data);
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uint8_t i2c_writeBytes(uint8_t *data, uint8_t bytes);
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uint8_t i2c_requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop);
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int i2c_available(void);
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uint8_t i2c_read(void);
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void i2c_onReceiveService(uint8_t* inBytes, int numBytes);
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void i2c_onRequestService(void);
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void i2c_onReceive( void(*function)(uint8_t));
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void i2c_onRequest( void(*function)(void));
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struct {
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	uint8_t rxBuffer[MAX_BUFFER];
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	// Save 8 bytes. Maximum buffer size is 15
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	union {
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		uint8_t rxMeta;
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		struct {
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			uint8_t rxBufferIndex:4;
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			uint8_t rxBufferLength:4;
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		};
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	};
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	uint8_t txAddress;
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	uint8_t txBuffer[MAX_BUFFER];
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	union {
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		uint8_t txMeta;
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		struct {
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			uint8_t txBufferIndex:4;
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			uint8_t txBufferLength:4;
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		};
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	};
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	void    (*user_onRequest)(void);
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	void    (*user_onReceive)(uint8_t);
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	union {
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		uint8_t internal;
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		struct {
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			uint8_t transmitting:1;
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			uint8_t reserved:7;
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		};
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	};
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} wire;
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#endif