HT7M2136 datasheet(22/25 Pages) HOLTEK

22 / 25 page

Rev. 1.20

June 17, 2016

HT7M2126/27/36/56/76

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

* Function Name: i2c_stop

* Return Value: void

* Parameters: void

* Description: Send I2C Stop command

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

void i2c_stop(void) {

SDA_OUT();

//sda output

IIC_SCL_L(); //IIC_SCL=0;

IIC_SDA=0;

//STOP:when CLK is high DATA change form low to high

_delay(4);

IIC_SCL_H();

IIC_SDA=1;

_delay(4);

}

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

* Function Name: i2c_write

* Return Value:

* Parameters: Single data byte for I2C2 bus.

* Description: This routine writes a single byte to the

* I2C2 bus.

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

void i2c_write( unsigned char txd ) {

uint8 t,buf;

SDA_OUT();

IIC_SCL_L();//IIC_SCL=0;

for(t=0;t<8;t++)

{

buf=txd&0x80;

IIC_SDA = buf>>7;

//IIC_SDA=(txd&0x80)>>7;

txd<<=1;

_delay(2);

IIC_SCL_H();

//IIC_SCL=1;

_delay(2);

IIC_SCL_L();

//IIC_SCL=0;

_delay(2);

}

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

* Function Name: i2c_read

* Return Value: read iic data

* Parameters: ack = 1 and nak = 0

* Description: Read a byte from I2C bus and ACK/NAK device

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

unsigned char i2c_read( unsigned char ack ) {

unsigned char i,receive=0;

SDA_IN();

for(i=0;i<8;i++ )

{

IIC_SCL_L();

//IIC_SCL=0;

_delay(2);

IIC_SCL_H();

//IIC_SCL=1;

receive<<=1;

if(READ_SDA)receive++;

_delay(2);

}

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