- # State machine.
- if self.state == 'IDLE':
- if pins[0] not in (0, 1):
- self.handle_bits(pins[1:])
- else:
- self.find_clk_edge(pins[0], pins[1:])
- else:
- raise Exception('Invalid state: %s' % self.state)
+ if sum(1 for p in pins if p in (0, 1)) == 0:
+ raise ChannelError('At least one channel has to be supplied.')