diff options
Diffstat (limited to 'decoders/usb_signalling/pd.py')
| -rw-r--r-- | decoders/usb_signalling/pd.py | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/decoders/usb_signalling/pd.py b/decoders/usb_signalling/pd.py index d2a1e8a..8a323e0 100644 --- a/decoders/usb_signalling/pd.py +++ b/decoders/usb_signalling/pd.py @@ -94,6 +94,7 @@ class Decoder(srd.Decoder): ] def __init__(self): + self.samplerate = None self.oldsym = 'J' # The "idle" state is J. self.ss_sop = None self.ss_block = None @@ -107,12 +108,16 @@ class Decoder(srd.Decoder): self.consecutive_ones = 0 self.state = 'IDLE' - def start(self, metadata): + def start(self): self.out_proto = self.add(srd.OUTPUT_PROTO, 'usb_signalling') self.out_ann = self.add(srd.OUTPUT_ANN, 'usb_signalling') - self.bitrate = bitrates[self.options['signalling']] - self.bitwidth = float(metadata['samplerate']) / float(self.bitrate) - self.halfbit = int(self.bitwidth / 2) + + def metadata(self, key, value): + if key == srd.SRD_CONF_SAMPLERATE: + self.samplerate = value + self.bitrate = bitrates[self.options['signalling']] + self.bitwidth = float(self.samplerate) / float(self.bitrate) + self.halfbit = int(self.bitwidth / 2) def report(self): pass @@ -201,6 +206,8 @@ class Decoder(srd.Decoder): self.oldsym = sym def decode(self, ss, es, data): + if self.samplerate is None: + raise Exception("Cannot decode without samplerate.") for (self.samplenum, pins) in data: # State machine. if self.state == 'IDLE': |