clf.py 文件源码

def sense(self, targets, **kwargs):
        """Send discovery and activation requests to find a
        target. Targets is a list of target specifications (TTA, TTB,
        TTF). Not all readers may support all possible target
        types. The return value is an activated target with a possibly
        updated specification (bitrate) or None.

        Additional keyword arguments are driver specific.

        .. note:: This is a direct interface to the
           driver and not needed if :meth:`connect` is used.
        """
        if self.dev is None:
            raise IOError(errno.ENODEV, os.strerror(errno.ENODEV))

        with self.lock:
            return self.dev.sense(targets, **kwargs)