l.append(d)
return tuple(l)
+class ChannelError(Exception):
+ pass
+
class Decoder(srd.Decoder):
api_version = 2
id = 'parallel'
self.oldpins = None
self.ss_item = self.es_item = None
self.first = True
- self.state = 'IDLE'
def start(self):
self.out_python = self.register(srd.OUTPUT_PYTHON)
self.items.append(item)
self.itemcount += 1
- if self.first == True:
+ if self.first:
# Save the start sample and item for later (no output yet).
self.ss_item = self.samplenum
self.first = False
continue
self.oldpins = pins
- # 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.')
+ if pins[0] not in (0, 1):
+ self.handle_bits(pins[1:])
+ else:
+ self.find_clk_edge(pins[0], pins[1:])