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/****************************************************************************
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 Title	:   C  include file for the I2C FUNCTIONS library (i2c.h)
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 Author:    Chris efstathiou hendrix@otenet.gr
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 Date:	    13/Jul/2002
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 Software:  AVR-GCC with AVR-AS
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 Target:    any AVR device
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 Comments:  This software is FREE.
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*****************************************************************************/
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#ifndef I2C_H
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#define I2C_H	1
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/*##############################################################################################*/
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/*			       START OF CONFIGURATION BLOCK					*/
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/*##############################################################################################*/
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#ifndef  F_CPU
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#define  F_CPU		  3686400L  /* The cpu clock frequency in Hertz (used to calculate time)*/
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#endif
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#define I2C_SDA_PORT	  D	    /* The SDA port. Use capital letter (A,B,C,D... etc.) */
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#define SDA_PIN 	  4	    /* The SDA port pin */
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#define I2C_SCL_PORT	  D	    /* The SCL port. Use capital letter (A,B,C,D... etc.) */
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#define SCL_PIN 	  5	    /* The SCL port pin */
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/*
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   The I2C_DELAY_TIME normally is 5 microseconds for a 100 Khz I2C bus ( (1/100000)/2 ).
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   but due to bus capacitance and device responce time in my application i use 50 microseconds.
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   The I2C_TIMEOUT_TIME is set to whatever is the maximum time you think your device will take
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   to perform the requested task. After that time the i2c_transmit function will return
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   a "I2C_ERROR_DEVICE_NOT_RESPONDING" or "I2C_ERROR_DEVICE_BUSY" error code. 
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*/ 
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#define I2C_DELAY_TIME	  50	   /* in microseconds (max over 1 second) */
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#define I2C_TIMEOUT_TIME  1000	   /* in microseconds (max over 1 second) */
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/*##############################################################################################*/
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/*				END OF CONFIGURATION BLOCK					*/
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/*##############################################################################################*/
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/* Keyword definitions */
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#define I2C_READ	1
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#define I2C_WRITE	0
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#define I2C_QUIT	0
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#define I2C_CONTINUE	1
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#define I2C_NO_ERROR			 0
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#define I2C_ERROR_DEVICE_BUSY		 1
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#define I2C_ERROR_DEVICE_NOT_RESPONDING  2
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/* Function Declaration */
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extern	void	      i2c_init(void);
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extern	void	      i2c_start(void);
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extern	void	      i2c_stop(void);
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extern	unsigned char i2c_transmit(unsigned char data);
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extern	unsigned char i2c_receive(unsigned char ack);
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/* Macro definitions */
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#define I2C_START(ADDRESS)     { i2c_start(); i2c_transmit(ADDRESS); }
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#define I2C_START_TX(ADDRESS)  I2C_START(ADDRESS)
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#define I2C_START_RX(ADDRESS)  I2C_START(ADDRESS | I2C_READ)
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#endif	/*  #ifndef I2C_H */
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/*######################################################################################################*/
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/*					   T H E   E N D						*/
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/*######################################################################################################*/
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