//this is an implemention
//of using two free chooseable
//pins of an avr as i2c-signals,
//not using the i2c-feature of the atmega
//if you will not use the default
//PORTC0,1 sigs, you have to define
//SCLSIGPORT,SCLSIGDIRPORT,SCLSIGREADPORT
//SDASIGPORT,SDASIGDIRPORT,SDASIGREADPORT
//before include this.
//
#ifndef __I2CSIG_H
#define __I2CSIG_H

#include "global.h"
#include "utils.h"


#ifndef SCLSIGPORT
#define SCLSIGPORT		PORTC	// i2csig clock port write
#endif
#ifndef SDASIGPORT
#define SDASIGPORT		PORTC	// i2csig data port write
#endif
#ifndef SCLSIGDIRPORT
#define SCLSIGDIRPORT	DDRC	// i2csig clock port direction
#endif
#ifndef SDASIGDIRPORT
#define SDASIGDIRPORT	DDRC	// i2csig data port direction
#endif
#ifndef SCLSIGREADPORT
#define SCLSIGREADPORT	PINC	// i2csig clock port read
#endif
#ifndef SDASIGREADPORT
#define SDASIGREADPORT	PINC	// i2csig data port read
#endif

#define SCLSIG	0			// i2csig clock pin
#define	SDASIG	1			// i2csig data pin


#define I2CSIGQDEL	Delay1us(6)
// i2csig quarter-bit delay

#define I2CSIG_SDA_LO      cbi( SDASIGPORT, SDASIG)
#define I2CSIG_SDA_HI      sbi( SDASIGPORT, SDASIG)

#define I2CSIG_SCL_LO      cbi( SCLSIGPORT, SCLSIG) 
#define I2CSIG_SCL_HI      sbi( SCLSIGPORT, SCLSIG) 
	

#define  I2C_SUCCESSFUL       0x00
#define  I2C_NO_ACKNOWLEDGE   0xFE
#define  I2C_NOT_IMPLEMENTED  0xFF


extern void i2csig_init(void);
extern BYTE i2csig_send(BYTE dev, BYTE sub, WORD length, BYTE *data);
extern BYTE i2csig_receive(BYTE dev, BYTE sub, WORD length, BYTE *data);

#endif