/**
* @brief This function checks ACK/NACK from I2C slave.
* @param None
* @return None
*/
bool I2cChkAck(void* I2cMasterHandle)
{
bool Ack;
SetInputSDA(I2cMasterHandle);//Allow slave to send ACK
ClrSCL(I2cMasterHandle);//slave send ACK
SetSCL(I2cMasterHandle);
Ack = !GetSDA(I2cMasterHandle);//Get ACK from slave
ClrSCL(I2cMasterHandle);
return Ack;
}
/**
* @brief This function generates I2C stop timing.
* @param None
* @return None
*/
void I2cStop(void* I2cMasterHandle)
{
SetOutputSCL(I2cMasterHandle);
SetOutputSDA(I2cMasterHandle);
ClrSDA(I2cMasterHandle);
SetSCL(I2cMasterHandle);
SetSDA(I2cMasterHandle);
SetInputSDA(I2cMasterHandle);
}
// Check Ackowledge signal(ACK/NACK).
BOOL I2C_ChkAck(BYTE I2cDevice)
{
BOOL Ack;
ClrSCL(I2cDevice);
SetInputSDA(I2cDevice);
SetSCL(I2cDevice);
KtIICDelay();
Ack = !GetSDA(I2cDevice);
ClrSCL(I2cDevice);
return Ack;
}
// send STOP signal.
VOID I2C_Stop(BYTE I2cDevice)
{
// DBG(("I2C_Stop()\n"));
SetOutputSCL(I2cDevice);
SetOutputSDA(I2cDevice);
ClrSDA(I2cDevice);
KtIICDelay();
SetSCL(I2cDevice);
SetSDA(I2cDevice);
SetInputSDA(I2cDevice);
}
// Receive one byte via I2C.
BYTE I2C_ReadByte(BYTE I2cDevice)
{
BYTE i = 8;
BYTE Dat = 0;
SetInputSDA(I2cDevice);
while(i--)
{
Dat <<= 1;
if(GetSDA(I2cDevice))
{
Dat |= 0x01;
}
SetSCL(I2cDevice);
KtIICDelay();
ClrSCL(I2cDevice);
}
SetOutputSDA(I2cDevice);
return Dat;
}
/**
* @brief This function recieve one byte from I2C slave.
* @param none
* @return Data received from I2C slave
*/
uint8_t I2cReadByte(void* I2cMasterHandle)
{
uint8_t i = 8;
uint8_t Dat = 0;
SetInputSDA(I2cMasterHandle);
while(i--)
{
SetSCL(I2cMasterHandle);
Dat <<= 1;
if(GetSDA(I2cMasterHandle))
{
Dat |= 0x01;
}
ClrSCL(I2cMasterHandle);
}
SetOutputSDA(I2cMasterHandle);
return Dat;
}
