/*
* 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 hwI2CReadReg(
unsigned char deviceAddress,
unsigned char registerIndex
)
{
unsigned char value = (0xFF);
if (hwI2CWriteData(deviceAddress, 1, ®isterIndex) == 1)
hwI2CReadData(deviceAddress, 1, &value);
return value;
}
/*
* This function read the i2c device register value
*
* Input: deviceAddress - I2C Device Address
* registerIndex - Register index to be read
*
* Output:
* The value of the register being read.
*/
unsigned long hwI2CReadRegMultiple(
unsigned char deviceAddress,
unsigned char registerIndex,
unsigned long length,
unsigned char *pBuffer
)
{
unsigned long totalData = 0;
/* The length is limited to 256 since register index is limited to unsigned char. */
if ((registerIndex + length) > 256)
length = 256 - registerIndex;
/* Read from the slave device */
if (hwI2CWriteData(deviceAddress, 1, ®isterIndex) == 1)
totalData = hwI2CReadData(deviceAddress, length, pBuffer);
/* Return the total number of read data */
return totalData;
}