i2c.h

C code for using 8051 to control philiphs I2C FM tuner (use sdcc compiler)

#ifndef _I2C_H
#define _I2C_H

/* GPIO Pin Definitions */

#define I2C_SCL_CLR		P0_0 = 0
#define I2C_SCL_SET		P0_0 = 1
#define I2C_SDA_GET		P0_1
#define I2C_SDA_CLR		P0_1 = 0
#define I2C_SDA_SET		P0_1 = 1

/* I2C Data flow Direction Definitions */
#define I2C_WRITE   0x00    /* Write Direction */
#define I2C_READ    0x01    /* Read Direction */

/* I2C Acknowledge Definitions */
#define I2C_ACK     0
#define I2C_NO_ACK  1

/* I2C functions */
/* Generate the start condition */
void I2C_Start();
/* Generate the stop condition */
void I2C_Stop();
/* Master send a byte to the slave device */
void I2C_Send_Byte(unsigned char byte);
/* Master send the slave address */
void I2C_Send_Addr(unsigned char addr, unsigned char dir);
/* Master send the data to the slave device */
#define I2C_Send_data   I2C_Send_Byte
/* Master get a byte from the slave device */
unsigned char I2C_Get_Byte(unsigned char last);
/* Master get the data from the slave device */
#define I2C_Get_data	I2C_Get_Byte
/* Hold the voltage level of the signal */
#define I2C_NOP() _asm nop nop nop _endasm

#endif