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| author | Stephan Thiele <stephan.thiele@mailbox.org> | 2019-02-22 19:57:56 +0100 |
|---|---|---|
| committer | Uwe Hermann <uwe@hermann-uwe.de> | 2019-10-06 23:36:04 +0200 |
| commit | fd41596ace75474b122f697ba85ffab28cc0dca7 (patch) | |
| tree | 7349dddff00789c8196354d647d4fc66210ac101 /decoders/can/pd.py | |
| parent | 0102e92b4979de776cdabf50fcff69d8c95f30ca (diff) | |
| download | libsigrokdecode-fd41596ace75474b122f697ba85ffab28cc0dca7.tar.gz libsigrokdecode-fd41596ace75474b122f697ba85ffab28cc0dca7.zip | |
can: correct decoding of CRC-21
Diffstat (limited to 'decoders/can/pd.py')
| -rw-r--r-- | decoders/can/pd.py | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/decoders/can/pd.py b/decoders/can/pd.py index 2087742..0c96ad3 100644 --- a/decoders/can/pd.py +++ b/decoders/can/pd.py @@ -65,6 +65,7 @@ class Decoder(srd.Decoder): ('fields', 'Fields', tuple(range(15))), ('warnings', 'Warnings', (16,)), ) + fd = False def __init__(self): self.reset() @@ -166,17 +167,17 @@ class Decoder(srd.Decoder): self.ss_block = self.samplenum if self.fd: - if self.dlc < 16: + if self.dlc2len(self.dlc) < 16: self.crc_len = 27 # 17 + SBC + stuff bits else: - self.crc_len = 21 + self.crc_len = 32 # 21 + SBC + stuff bits else: self.crc_len = 15 # CRC sequence (15 bits, 17 bits or 21 bits) elif bitnum == (self.last_databit + self.crc_len): if self.fd: - if self.dlc < 16: + if self.dlc2len(self.dlc) < 16: crc_type = "CRC-17" else: crc_type = "CRC-21" @@ -271,9 +272,7 @@ class Decoder(srd.Decoder): self.dlc = int(''.join(str(d) for d in self.bits[self.dlc_start:self.dlc_start + 4]), 2) self.putb([10, ['Data length code: %d (%d Bytes)' % (self.dlc, self.dlc2len(self.dlc)), 'DLC: %d (%d B)' % (self.dlc, self.dlc2len(self.dlc)), 'DLC']]) - self.last_databit = self.dlc_start + 3 + (self.dlc * 8) - if self.dlc > 8: - self.putb([16, ['Data length code (DLC) > 8 is not allowed']]) + self.last_databit = self.dlc_start + 3 + (self.dlc2len(self.dlc) * 8) # Remember all databyte bits, except the very last one. elif bitnum in range(self.dlc_start + 4, self.last_databit): @@ -283,7 +282,7 @@ class Decoder(srd.Decoder): # The bits within a data byte are transferred MSB-first. elif bitnum == self.last_databit: self.ss_databytebits.append(self.samplenum) # Last databyte bit. - for i in range(self.dlc): + for i in range(self.dlc2len(self.dlc)): x = self.dlc_start + 4 + (8 * i) b = int(''.join(str(d) for d in self.bits[x:x + 8]), 2) ss = self.ss_databytebits[i * 8] @@ -345,9 +344,9 @@ class Decoder(srd.Decoder): # Bits 35-38: Data length code (DLC), in number of bytes (0-8). elif bitnum == 38: self.dlc = int(''.join(str(d) for d in self.bits[35:38 + 1]), 2) - self.putb([10, ['Data length code: %d' % self.dlc, - 'DLC: %d' % self.dlc, 'DLC']]) - self.last_databit = 38 + (self.dlc * 8) + self.putb([10, ['Data length code: %d (%d Bytes)' % (self.dlc, self.dlc2len(self.dlc)), + 'DLC: %d (%d B)' % (self.dlc, self.dlc2len(self.dlc)), 'DLC']]) + self.last_databit = 38 + (self.dlc2len(self.dlc) * 8) # Remember all databyte bits, except the very last one. elif bitnum in range(39, self.last_databit): @@ -357,7 +356,7 @@ class Decoder(srd.Decoder): # The bits within a data byte are transferred MSB-first. elif bitnum == self.last_databit: self.ss_databytebits.append(self.samplenum) # Last databyte bit. - for i in range(self.dlc): + for i in range(self.dlc2len(self.dlc)): x = 38 + (8 * i) + 1 b = int(''.join(str(d) for d in self.bits[x:x + 8]), 2) ss = self.ss_databytebits[i * 8] |