ReadSMBusWord what is it doing

Hello,

  I am using the F28069 to try to communicate with the BQ3060.  In all the documentation I see code referencing ReadSMBusWord().  I am unable to find what the I2C receive should look like.  Does anyone know what this function should look like?

  Currently I am using the following and get a NACK on the I2C line after I try to send the device address and register number.

Here is my code:

  #define DEVICE_ADDRESS  0x16

  #define cc_voltage 0x09

  #define BUFF_LENGTH 2

  Unsigned char batter_com_buffer[BUFF_LENGTH];

Uint16 get_battery_voltage_register_value(void) {
  Uint16 register_value;
  if(i2ca_recv(DEVICE_ADDRESS, cc_voltage, 2, battery_com_buffer) != 0) {
    return(0);
  }
  register_value = ((Uint16)battery_com_buffer[0]) * 256;
  register_value += ((Uint16)battery_com_buffer[1]);
  return(register_value);
}

int i2ca_recv(Uint16 dev_addr, Uint16 reg_addr, Uint16 length,
  unsigned char* rx_buffer) {
	int i = 0;
	int return_value = 0;
	I2caRegs.I2CSTR.bit.NACK = 1;
	if(I2caRegs.I2CMDR.bit.STP == 1) {		//if not cleared
		return (1);							//error
	}
	//  setup the command to send the device address and the register address
	//    in master transmit mode
	I2caRegs.I2CMDR.all = 0x0620;  // send first bit without the stop bit
  // setup the device address
  I2caRegs.I2CSAR = dev_addr;
  // set the byte count
	I2caRegs.I2CCNT = 1;  // setup the number of register address bits
	// set the first(only) byte into the transmit register
	I2caRegs.I2CDXR = reg_addr;
	// set start bit (start transmitting)
  I2caRegs.I2CMDR.bit.STT = 1;
  // if we get a nack on the address
  if(I2caRegs.I2CSTR.bit.NACK == 1) {
	  I2caRegs.I2CMDR.bit.STP = 1; // stop transmission
	  return(1);
  }
  // wait until the I2C module is ready continue
  while(I2caRegs.I2CSTR.bit.ARDY == 0) {
    if((I2caRegs.I2CSTR.bit.ARBL == 1)) {
      return(2);
    }
  }
  // re-setup device address
  I2caRegs.I2CSAR = dev_addr;
  // set the transceive length
  I2caRegs.I2CCNT = length;
  // set to receive
  I2caRegs.I2CMDR.bit.TRX = 0;
  // send start command
  I2caRegs.I2CMDR.bit.STT = 1;
  //get the data from the line
  for(i = 0; i < length; ++i) {
    while(I2caRegs.I2CSTR.bit.RRDY == 0) {
      if(I2caRegs.I2CSTR.bit.NACK) {
        ++return_value;
        break;
      }
    }
    if(I2caRegs.I2CSTR.bit.NACK) {
      ++return_value;
      break;
    }
    rx_buffer[i] = I2caRegs.I2CDRR;
  }
	I2caRegs.I2CMDR.bit.STP = 1; // stop transmission
	return(return_value);
}