+ raise ChannelError('Either MISO or MOSI (or both) pins required.')
+
+ # Tell stacked decoders that we don't have a CS# signal.
+ if not self.no_cs_notification and not self.have_cs:
+ self.put(0, 0, self.out_python, ['CS-CHANGE', -1, -1])
+ self.no_cs_notification = True