<value>: integer
'''
+class SamplerateError(Exception):
+ pass
+
class Decoder(srd.Decoder):
- api_version = 1
+ api_version = 2
id = 'i2s'
name = 'I²S'
longname = 'Integrated Interchip Sound'
license = 'gplv2+'
inputs = ['logic']
outputs = ['i2s']
- probes = (
+ channels = (
{'id': 'sck', 'name': 'SCK', 'desc': 'Bit clock line'},
{'id': 'ws', 'name': 'WS', 'desc': 'Word select line'},
{'id': 'sd', 'name': 'SD', 'desc': 'Serial data line'},
# Calculate the sample rate.
samplerate = '?'
- if self.start_sample != None and \
- self.first_sample != None and \
+ if self.start_sample is not None and \
+ self.first_sample is not None and \
self.start_sample > self.first_sample:
samplerate = '%d' % (self.samplesreceived *
self.samplerate / (self.start_sample -
return bytes([lo, hi])
def decode(self, ss, es, data):
- if self.samplerate is None:
- raise Exception("Cannot decode without samplerate.")
+ if not self.samplerate:
+ raise SamplerateError('Cannot decode without samplerate.')
for self.samplenum, (sck, ws, sd) in data:
# Ignore sample if the bit clock hasn't changed.
continue
# Only submit the sample, if we received the beginning of it.
- if self.start_sample != None:
+ if self.start_sample is not None:
if not self.wrote_wav_header:
self.put(0, 0, self.out_bin, (0, self.wav_header()))
self.start_sample = self.samplenum
# Save the first sample position.
- if self.first_sample == None:
+ if self.first_sample is None:
self.first_sample = self.samplenum
self.oldws = ws
-