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             usi_i2c_slave.h
        
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      /*-----------------------------------------------------*\

      |  USI I2C Slave Driver                                 |

      |                                                       |

      | This library provides a robust, interrupt-driven I2C  |

      | slave implementation built on the ATTiny Universal    |

      | Serial Interface (USI) hardware.  Slave operation is  |

      | implemented as a register bank, where each 'register' |

      | is a pointer to an 8-bit variable in the main code.   |

      | This was chosen to make I2C integration transparent   |

      | to the mainline code and making I2C reads simple.     |

      | This library also works well with the Linux I2C-Tools |

      | utilities i2cdetect, i2cget, i2cset, and i2cdump.     |

      |                                                       |

      | Adam Honse (GitHub: CalcProgrammer1) - 7/29/2012      |

      |            -calcprogrammer1@gmail.com                 |

      \*-----------------------------------------------------*/

      #ifndef USI_I2C_SLAVE_H

      #define USI_I2C_SLAVE_H

      #include <avr/io.h>

      #include <avr/interrupt.h>

      #ifdef __AVR_ATtiny85__

      #define DDR_USI             DDRB

      #define PORT_USI            PORTB

      #define PIN_USI             PINB

      #define PORT_USI_SDA        PB0

      #define PORT_USI_SCL        PB2

      #define PIN_USI_SDA         PINB0

      #define PIN_USI_SCL         PINB2

      #endif

      #define USI_SLAVE_REGISTER_COUNT 8

      //USI I2C Initialize

      //  address - If slave, this parameter is the slave address

      void USI_I2C_Init(char address);

      #endif

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				/-----------------------------------------------------\
				\| USI I2C Slave Driver \|
				\| \|
				\| This library provides a robust, interrupt-driven I2C \|
				\| slave implementation built on the ATTiny Universal \|
				\| Serial Interface (USI) hardware. Slave operation is \|
				\| implemented as a register bank, where each 'register' \|
				\| is a pointer to an 8-bit variable in the main code. \|
				\| This was chosen to make I2C integration transparent \|
				\| to the mainline code and making I2C reads simple. \|
				\| This library also works well with the Linux I2C-Tools \|
				\| utilities i2cdetect, i2cget, i2cset, and i2cdump. \|
				\| \|
				\| Adam Honse (GitHub: CalcProgrammer1) - 7/29/2012 \|
				\| -calcprogrammer1@gmail.com \|
				\-----------------------------------------------------/
				#ifndef USI_I2C_SLAVE_H
				#define USI_I2C_SLAVE_H

				#include <avr/io.h>
				#include <avr/interrupt.h>

				#ifdef __AVR_ATtiny85__
				#define DDR_USI DDRB
				#define PORT_USI PORTB
				#define PIN_USI PINB
				#define PORT_USI_SDA PB0
				#define PORT_USI_SCL PB2
				#define PIN_USI_SDA PINB0
				#define PIN_USI_SCL PINB2
				#endif

				#define USI_SLAVE_REGISTER_COUNT 8

				//USI I2C Initialize
				// address - If slave, this parameter is the slave address
				void USI_I2C_Init(char address);

				#endif