docs: def read_pid_constants(self):
          """Reads back the PID constants stored on the Grizzly."""
          p = self._read_as_int(Addr.PConstant, 4)
          i = self._read_as_int(Addr.IConstant, 4)
          d = self._read_as_int(Addr.DConstant, 4)
          
          return map(lambda x: x / (2 ** 16), (p, i, d))