- for (samplenum, (pin,)) in data:
- # Ignore identical samples early on (for performance reasons).
- if self.oldpin == pin:
- continue
-
- if self.oldpin is None:
- self.oldpin = pin
- self.last_samplenum = samplenum
- self.lastlast_samplenum = samplenum
- self.last_edge = samplenum
- self.oldpl = 0
- self.oldpp = 0
- self.oldsamplenum = 0
- self.last_bit_pos = 0
- continue
-
- if self.oldpin != pin:
- pl = samplenum - self.oldsamplenum
- pp = pin
- self.manchester_decode(samplenum, pl, pp, pin)
- self.oldpl = pl
- self.oldpp = pp
- self.oldsamplenum = samplenum
- self.oldpin = pin
+
+ # Initialize internal state from the very first sample.
+ (pin,) = self.wait()
+ self.oldpin = pin
+ self.last_samplenum = self.samplenum
+ self.lastlast_samplenum = self.samplenum
+ self.last_edge = self.samplenum
+ self.oldpl = 0
+ self.oldpp = 0
+ self.oldsamplenum = 0
+ self.last_bit_pos = 0
+
+ while True:
+ # Ignore identical samples, only process edges.
+ (pin,) = self.wait({0: 'e'})
+ pl = self.samplenum - self.oldsamplenum
+ pp = pin
+ self.manchester_decode(pl, pp, pin)
+ self.oldpl = pl
+ self.oldpp = pp
+ self.oldsamplenum = self.samplenum
+ self.oldpin = pin