#ifndef I2C_FAST_MODE
# warning: I2C_FAST_MODE not defined, assume not
#endif

#ifdef I2C_FAST_MODE
#define I2C_T2		2
#define I2C_T4		1
#else
#define I2C_T2		5
#define I2C_T4		4
#endif

#define I2C8BIT	0xF0
#define I2C1BIT	0xFE

//////////////////////////////////////////////////////////////////////////
//Microcontroller Dependent Definitions
#if defined (__AVR_ATtiny24__) | defined (__AVR_ATtiny44__) | defined (__AVR_ATtiny84__) |\
	defined (__AVR_ATtiny24A__) | defined (__AVR_ATtiny44A__) | defined (__AVR_ATtiny84A__)
#define DDR_USI		DDRA
#define PORT_USI	PORTA
#define PIN_USI		PINA
#define USI_SDA		PINA6
#define USI_SCL		PINA4
#endif

#if defined(__AVR_AT90Tiny2313__) | defined(__AVR_ATtiny2313__)
#define DDR_USI		DDRB
#define PORT_USI	PORTB
#define PIN_USI		PINB
#define USI_SDA		5
#define USI_SCL		7
#endif


/**********************************************************************/
  /*!
    @brief		Initialize USI as I2C-Master
    @param		none
	@returns	nothing
  */
/**********************************************************************/
void I2CinitM();

/**********************************************************************/
  /*!
    @brief		Transfers 8/1 bit of data, used by other functions
    @param		config	configuration for 8/1 bit
	@returns	received data
  */
/**********************************************************************/
uint8_t I2Ctransfer(uint8_t config);

/**********************************************************************/
  /*!
    @brief		Starts new transmission, sends address and R/!W
    @param		address	Address of device
	@param		mode	1 Read, 0 Write
	@returns	1 device reacting, 0 no device reacting
  */
/**********************************************************************/
uint8_t I2Cstart(uint8_t address, uint8_t mode);

/**********************************************************************/
  /*!
    @brief		Writes data to device
    @param		*data		data buffer with data to write
	@param		bufsize		size of data buffer
	@returns	1 success, 0 failure
  */
/**********************************************************************/
uint8_t I2Cwrite(uint8_t *data, uint8_t bufsize);

/**********************************************************************/
  /*!
    @brief		Reads data from device
    @param		*data		data buffer with data to write
    @param		bufsize		size of data buffer
    @returns	1 success, 0 failure
  */
/**********************************************************************/
uint8_t I2Cread(uint8_t *data, uint8_t bufsize);

/**********************************************************************/
  /*!
    @brief		Stops transmission
    @param		none
	@returns	nothing
  */
/**********************************************************************/
void I2Cstop();