HT7M2136 datasheet(23/25 Pages) HOLTEK

23 / 25 page

Rev. 1.20

June 17, 2016

HT7M2126/27/36/56/76

if (ack)

i2c_ack();

//send ACK

else

i2c_nack();

//send ACK

return receive;

}

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

* Function Name: i2c_wait_ack

* Return Value: 1:get ack success ,0:get ack failed

* Parameters:

* Description: wait ack from i2c bus

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

unsigned char i2c_wait_ack ()

{

uint8 ucErrTime=0;

SDA_IN();

IIC_SDA=1;_delay(1);

IIC_SCL_H();//IIC_SCL=1;

_delay(1);

while(READ_SDA)

{

ucErrTime++;

if(ucErrTime>50)

{

IIC_Stop();

return 1;

}

_delay(1);

}

IIC_SCL_L();

//IIC_SCL=0;

return 0;

}

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

* Function Name: i2c_ack

* Return Value:

* Parameters:

* Description: generate ack to i2c bus

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

void i2c_ack()

{

IIC_SCL_L();

//IIC_SCL=0;

SDA_OUT();

IIC_SDA=0;

_delay(2);

IIC_SCL_H();

//IIC_SCL=1;

_delay(2);

IIC_SCL_L();

//IIC_SCL=0;

}

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

* Function Name: i2c_ nack

* Return Value:

* Parameters:

* Description: generate nack to i2c bus

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

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