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/*******************************************************************
*
* Copyright (c) 2007 by Silicon Motion, Inc. (SMI)
*
* All rights are reserved. Reproduction or in part is prohibited
* without the written consent of the copyright owner.
*
* swi2c.h --- SM750/SM718 DDK
* This file contains the definitions for i2c using software
* implementation.
*
*******************************************************************/
#ifndef _SWI2C_H_
#define _SWI2C_H_
/* Default i2c CLK and Data GPIO. These are the default i2c pins */
#define DEFAULT_I2C_SCL 30
#define DEFAULT_I2C_SDA 31
/*
* This function initializes the i2c attributes and bus
*
* Parameters:
* i2cClkGPIO - The GPIO pin to be used as i2c SCL
* i2cDataGPIO - The GPIO pin to be used as i2c SDA
*
* Return Value:
* -1 - Fail to initialize the i2c
* 0 - Success
*/
long swI2CInit(
unsigned char i2cClkGPIO,
unsigned char i2cDataGPIO
);
/*
* This function reads the slave device's register
*
* Parameters:
* deviceAddress - i2c Slave device address which register
* to be read from
* registerIndex - Slave device's register to be read
*
* Return Value:
* Register value
*/
unsigned char swI2CReadReg(
unsigned char deviceAddress,
unsigned char registerIndex
);
/*
* This function writes a value to the slave device's register
*
* Parameters:
* deviceAddress - i2c Slave device address which register
* to be written
* registerIndex - Slave device's register to be written
* data - Data to be written to the register
*
* Result:
* 0 - Success
* -1 - Fail
*/
long swI2CWriteReg(
unsigned char deviceAddress,
unsigned char registerIndex,
unsigned char data
);
/*
* These two functions are used to toggle the data on the SCL and SDA I2C lines.
* The used of these two functions are not recommended unless it is necessary.
*/
/*
* This function set/reset the SCL GPIO pin
*
* Parameters:
* value - Bit value to set to the SCL or SDA (0 = low, 1 = high)
*/
void swI2CSCL(unsigned char value);
/*
* This function set/reset the SDA GPIO pin
*
* Parameters:
* value - Bit value to set to the SCL or SDA (0 = low, 1 = high)
*/
void swI2CSDA(unsigned char value);
#endif /* _SWI2C_H_ */
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