ChibiOS Free Embedded RTOS

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From Adafruit lib

/**************************************************************************/
/*!
    @brief  Read 8 bits of data from ILI9341 configuration memory. NOT from RAM!
            This is highly undocumented/supported, it's really a hack but kinda works?
    @param    commandByte  The command register to read data from
    @param    index  The byte index into the command to read from
    @return   Unsigned 8-bit data read from ILI9341 register
 */
/**************************************************************************/
uint8_t Adafruit_ILI9341::readcommand8(uint8_t commandByte, uint8_t index) {
  uint8_t data = 0x10 + index;
  sendCommand(0xD9, &data, 1); // Set Index Register
  return Adafruit_SPITFT::readcommand8(commandByte);
}

/*!
 @brief   Read 8 bits of data from display configuration memory (not RAM).
 This is highly undocumented/supported and should be avoided,
 function is only included because some of the examples use it.
 @param   commandByte
 The command register to read data from.
 @param   index
 The byte index into the command to read from.
 @return  Unsigned 8-bit data read from display register.
 */
/**************************************************************************/
uint8_t Adafruit_SPITFT::readcommand8(uint8_t commandByte, uint8_t index) {
  uint8_t result;
  startWrite();
  SPI_DC_LOW();     // Command mode
  spiWrite(commandByte);
  SPI_DC_HIGH();    // Data mode
  do {
    result = spiRead();
  } while(index--); // Discard bytes up to index'th
  endWrite();
  return result;
}