TinyWireM.h

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#ifndef TinyWireM_h
#define TinyWireM_h

#include "Arduino.h"
#include <inttypes.h>
#define USI_SEND 0      
#define USI_RCVE 1      
#define USI_BUF_SIZE 18 


class USI_TWI {
private:
  static uint8_t USI_Buf[];      // holds I2C send and receive data
  static uint8_t USI_BufIdx;     // current number of bytes in the send buff
  static uint8_t USI_LastRead;   // number of bytes read so far
  static uint8_t USI_BytesAvail; // number of bytes requested but not read

public:
  USI_TWI();
  void begin();
  void beginTransmission(uint8_t);
  size_t write(uint8_t);
  inline size_t write(uint8_t *d, uint8_t n) {
    uint16_t i;
    for (i = 0; i < n; i++)
      write(d[i]);
    return (size_t)n;
  }
  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); }
  void send(uint8_t b) { write(b); }
  void send(uint8_t *d, uint8_t n) { write(d, n); }
  void send(int n) { write((uint8_t)n); }
  uint8_t endTransmission();
  uint8_t endTransmission(uint8_t);
  uint8_t requestFrom(uint8_t, uint8_t);
  int read();
  int available();
  int peek(void);
  void flush(void);
  uint8_t receive(void) {
    int c = read();
    if (c < 0)
      return 0;
    return c;
  }
  void end();
};

extern USI_TWI TinyWireM;

#endif