code: def _check(self, command, *args):
          
          ret = command(self._ctx, *args)
          logger.debug('Called ftdi_{0} and got response {1}.'.format(command.__name__, ret))
          if ret != 0:
              raise RuntimeError('ftdi_{0} failed with error {1}: {2}'.format(command.__name__, ret, ftdi.get_error_string(self._ctx)))
docs: Helper function to call the provided command on the FTDI device and
          verify the response matches the expected value.