diff options
Diffstat (limited to 'decoders/usb_signalling/usb_signalling.py')
| -rw-r--r-- | decoders/usb_signalling/usb_signalling.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/decoders/usb_signalling/usb_signalling.py b/decoders/usb_signalling/usb_signalling.py index 512703d..3272cbf 100644 --- a/decoders/usb_signalling/usb_signalling.py +++ b/decoders/usb_signalling/usb_signalling.py @@ -67,6 +67,7 @@ class Decoder(srd.Decoder): self.scount = 0 self.packet = '' self.syms = [] + self.oldpins = None def start(self, metadata): self.samplerate = metadata['samplerate'] @@ -77,13 +78,18 @@ class Decoder(srd.Decoder): pass def decode(self, ss, es, data): - for (self.samplenum, (dp, dm)) in data: + for (self.samplenum, pins) in data: # Note: self.samplenum is the absolute sample number, whereas # self.scount only counts the number of samples since the # last change in the D+/D- lines. self.scount += 1 + # Ignore identical samples early on (for performance reasons). + if self.oldpins == pins: + continue + self.oldpins, (dp, dm) = pins, pins + if self.options['signalling'] == 'low-speed': sym = symbols_ls[dp, dm] elif self.options['signalling'] == 'full-speed': |