#ifndef	_I2C_H_#define _I2C_H_/* *	SDA (data) and SCL (clock) bits *	 *	Special note!!! *	 *	If the clock and data lines are in the same port, you will need *	to beware of the Read/Modify/Write issue in the PIC - since *	a bit set or clear on any one bit in a port will read and write *	back all other bits.  *//* Uncomment the next line to use the PIC's SSP Module*/#define I2C_MODULE 1#ifdef I2C_MODULE/* I2C module uses PORT C */#define SCL             RC3             /* clock on port C bit 2 */#define SCL_DIR         TRISC3#define SDA     RC4                     /* data on port C bit 1 */#define SDA_DIR         TRISC4#define I2CTRIS 		TRISC#define MASTER_MODE     0B1011          /* I2C firmware controlled Master Mode (slave idle) */#define SSPMode(val)   SSPCON &=0xF0; SSPCON|=(val & 0xf)#else/* Change port as required - defaults to port b */#define	SCL		RB2		/* clock on port B bit 2 */#define	SCL_DIR		TRISB2#define SDA             RB1             /* data on port B bit 1 */#define	SDA_DIR		TRISB1#define I2CTRIS TRISB#endif#define M_SDA_INP	0x02#define M_SDA_OUT   0xFD#define M_SCL_INP   0x04#define M_SCL_OUT	0xFB#define I2C_INPUT	1		/* data direction input */#define I2C_OUTPUT	0		/* data direction output */#define I2C_READ	0x01		/* read bit used with address */#define I2C_WRITE	0x00		/* write bit used with address */#define FALSE		0#define TRUE		!FALSE#define I2C_ERROR	(-1)#define I2C_LAST	FALSE		/* SendAck: no more bytes to send */#define I2C_MORE	TRUE		/* SendAck: more bytes to send */#define i2c_Start()				i2c_Restart()#define i2c_WriteTo(address)	i2c_Open((address), I2C_WRITE)#define i2c_ReadFrom(address)	i2c_Open((address), I2C_READ)#ifdef I2C_MODULE#define SCL_HIGH() SCL_DIR = I2C_INPUT#define SCL_LOW()  SCL_DIR = I2C_OUTPUT#define SDA_HIGH() SDA_DIR = I2C_INPUT#define SDA_LOW()  SDA_DIR = I2C_OUTPUT#else#define SCL_HIGH() SCL = 1; SCL_DIR = I2C_OUTPUT#define SCL_LOW()  SCL = 0; SCL_DIR = I2C_OUTPUT#define SDA_HIGH() SDA = 1; SDA_DIR = I2C_OUTPUT#define SDA_LOW()  SDA = 0; SDA_DIR = I2C_OUTPUT#endif/* * Timings for the i2c bus. Times are rounded up to the nearest * micro second. *///#define I2C_TM_BUS_FREE		2//#define	I2C_TM_START_SU		1//#define I2C_TM_START_HD		1//#define I2C_TM_SCL_LOW		1//#define	I2C_TM_SCL_HIGH		1//#define I2C_TM_DATA_SU		1//#define I2C_TM_DATA_HD		0//#define I2C_TM_SCL_TO_DATA	2	/* SCL low to data valid *///#define	I2C_TM_STOP_SU		2//#define I2C_TM_SCL_TMO		10	/* clock time out */#define I2C_TM_BUS_FREE		5#define	I2C_TM_START_SU		5#define I2C_TM_START_HD		4#define I2C_TM_SCL_LOW		5#define	I2C_TM_SCL_HIGH		4#define I2C_TM_DATA_SU		1#define I2C_TM_DATA_HD		0#define I2C_TM_SCL_TO_DATA	4	/* SCL low to data valid */#define	I2C_TM_STOP_SU		4#define I2C_TM_SCL_TMO		10	/* clock time out */extern unsigned char	i2c_Write(unsigned char,unsigned char, unsigned char);extern int				i2c_Read(unsigned char,unsigned char);extern signed char		i2c_ReadAcknowledge(void);extern unsigned char	i2c_SendAddress(unsigned char, unsigned char);extern unsigned char	i2c_SendByte(unsigned char);extern int				i2c_ReadByte(void);extern void				i2c_Restart(void);extern void				i2c_Stop(void);extern void				i2c_SendAcknowledge(unsigned char);extern signed char		i2c_PutByte(unsigned char);extern int				i2c_GetByte(unsigned char);extern unsigned char	i2c_Open(unsigned char, unsigned char);extern unsigned char	i2c_GetString(unsigned char *, unsigned char);extern int				i2c_PutString(const unsigned char *, unsigned char);extern unsigned char	i2c_WaitForSCL(void);extern void 			i2c_Free(void);#endif			/* _I2C_H_ */