code: def baseline_data(self, pin):
          
          assert pin >= 0 and pin < 12, 'pin must be between 0-11 (inclusive)'
          bl = self._i2c_retry(self._device.readU8, MPR121_BASELINE_0 + pin)
          return bl << 2
docs: Return baseline data register value for the provided pin (0-11).
          Useful for debugging.