HT7M2126 datasheet(21/25 Pages) HOLTEK

21 / 25 page

Rev. 1.20

June 17, 2016

HT7M2126/27/36/56/76

Appendix B

/*****************************************************************

FileName: I2C.c

Processor:HT66F60 Microcontrollers

Complier: IDE-3000 V7.71 V2 compiler

Company: holtek semiconductor .Inc

#include <HT66F60.h> // This code is developed for HT66F

//ItcanbemodifiedtobeusedwithanyHTmicroWithGPIO

/** PRIVATE PROTOTYPES**********************************/

void i2c_init(void);

void i2c_start(void);

void i2c_stop(void);

unsigned char i2c_wait_ack ()

void i2c_ack()

void i2c_nack()

unsigned char i2c_write( unsigned char txd );

unsigned char i2c_read( unsigned char ack );

#defineSDA_IN() _pcc3=1

#defineSDA_OUT() _pcc3=0

#defineSDA_PUH() _pcpu3=1

#defineIIC_SDA _pc3//SDA

#defineREAD_SDA _pc3//SDA

#defineSCL_IN() _pcc4=1

#defineSCL_OUT() _pcc4=0

#defineSCL_PUH() _pcpu4=1

#defineIIC_SCL _pc4//SCL

#defineREAD_SCL _pc4

/*****************************************************************

* Function Name: i2c_init

* Return Value: void

* Parameters: Set IO status

* Description: This function sets up

* HT66F device for use with a IO simulate I2C

*****************************************************************/

void i2c_init(void) {

SCL_OUT();

//scl set output

SDA_OUT();

//sda set output

SCL_PUH();

SDA_PUH();}

/********************************************************************

* Function Name: i2c_start

* Return Value: void

* Parameters: void

* Description: Send I2C Start Command

********************************************************************/

void i2c_start(void) {

SDA_OUT();

//sda output setting

IIC_SDA=1;

IIC_SCL_H();

//IIC_SCL=1;

_delay(4);

IIC_SDA=0;

//START:when CLK is high,DATA change form high to low

_delay(4);

IIC_SCL_L();}

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