penguin86/manchester-encoding
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This commit is contained in:
Daniele Verducci (Slimpenguin) 2022-06-04 12:34:05 +02:00
parent 2ef21af66f
commit afb7842d60
1 changed files with 6 additions and 3 deletions
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9
decode.py
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@ -102,7 +102,7 @@ class Main:
if expectFrameDelimiter: if expectFrameDelimiter:
decodedByte = self.decodeByte(True) decodedByte = self.decodeByte(True)
if decodedByte != FRAME_DELIMITER: if decodedByte != FRAME_DELIMITER:
raise ValueError('Expecting a frame delimiter, found {}'.format(decodedByte)) raise ValueError('Expecting a frame delimiter, found {} at position {}'.format(decodedByte, position))
self._log.info('Found frame delimiter') self._log.info('Found frame delimiter')
decodedByte = self.decodeByte(False) decodedByte = self.decodeByte(False)
@ -120,6 +120,7 @@ class Main:
def decodeByte(self, expectFrameDelimiter=False): def decodeByte(self, expectFrameDelimiter=False):
# Decodes a byte (to be used _after_ the first frame delimiter was found) # Decodes a byte (to be used _after_ the first frame delimiter was found)
decodedByte = 0 decodedByte = 0
consecutiveOnes = 0
for x in range(8): for x in range(8):
value = self.decodeBit() value = self.decodeBit()
@ -131,9 +132,11 @@ class Main:
# Add the read bit in the least significant position # Add the read bit in the least significant position
if value: if value:
decodedByte = decodedByte + 128 #10000000 decodedByte = decodedByte + 128 #10000000
consecutiveOnes = consecutiveOnes + 1
else:
consecutiveOnes = 0
if decodedByte == 248 and not expectFrameDelimiter: # 248 = 11111000 if consecutiveOnes == 5 and not expectFrameDelimiter:
self._log.info("Here")
# We found 5 1s: ignore next 0: has been added to avoid a real 01111110 byte to be interpreted as frame delimiter # We found 5 1s: ignore next 0: has been added to avoid a real 01111110 byte to be interpreted as frame delimiter
if self.decodeBit(): if self.decodeBit():
# Should be 0! # Should be 0!