i2c.h

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/****************************************************************************
*
* File Name:   i2c.h
* Project  :   asuro library 
*
* Description: I2C Functions included:
*
* void InitI2C(void);
* unsigned char WriteI2C(unsigned char byte);
* unsigned char ReadI2C(unsigned char nak);
* unsigned char StartI2C(unsigned char device);
* void StopI2C(void);
*
*
* Ver.     Date         Author           Comments
* -------  ----------   --------------   ------------------------------------------
* 2.70rc2  17.02.2007   raid_ox          new functions:
*                                        InitI2C: Initialisation
*                                        WriteI2C: Write Data over I2C
*                                        ...
* -------  ----------   --------------   ------------------------------------------
*****************************************************************************/

#ifndef I2C_H
#define I2C_H

/* I2C Bus Kommandos und Statusmeldungen */
#define READ    1
#define WRITE   0
#define ACK     1
#define NAK     0

/* I2C Bus Definitionen */

#define SDA     PC3
#define SCL     PC2
#define SDA_DDR   DDRC
#define SCL_DDR   DDRC
#define SDA_PIN   PINC
#define SCL_PIN   PINC
#define SDA_PORT  PORTC
#define SCL_PORT  PORTC

#define NOP     asm volatile("nop")         /*<! No Operation */
#define QDEL    NOP; NOP; NOP; NOP; NOP     /*<! 1/4 Delay */
#define HDEL    QDEL; QDEL                  /*<! 1/2 Delay */

#define SDA_HI    SDA_PORT |= (1 << SDA)
#define SDA_LO    SDA_PORT &= ~(1 << SDA)

#define SCL_HI    SCL_PORT |= (1 << SCL)
#define SCL_LO    SCL_PORT &= ~(1 << SCL)

#define SCL_TOGGLE  HDEL; SCL_HI; HDEL; SCL_LO
#define I2C_START SDA_LO; QDEL; SCL_LO
#define I2C_STOP  HDEL; SCL_HI; QDEL; SDA_HI; HDEL

/* I2C Bus Funktionsprototypen */

void InitI2C(void);
unsigned char WriteI2C(unsigned char byte);
unsigned char ReadI2C(unsigned char nak);
unsigned char StartI2C(unsigned char device);
void StopI2C(void);

#endif /* I2C_H */

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