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06-25-2024 03:25 AM
Hello, I have been analyzing some CAN ID, and I found one that has a CRC8 acording to my dbc. The last byte is the CRC8, but I don't know how is calculated. The first byte (byte 0) is a CHK which is The XOR of the rest of bytes + 134. 134 is the ID. I would like to find out what is the formula for the CRC.
The message of the dbc is:
F r MLB:
'Berechnung siehe Lastenheft 'Kommunikationsabsicherung f r FlexRay und CAN''
Ab MQB und MLBevo:
'Berechnung siehe Lastenheft 'End-to-End Kommunikationsabsicherung'
Endwerte siehe Begleitdokument 'S-PDU Kennungsfolgen
which means:
For MLB:
'Calculation see specification 'Communication security for FlexRay and CAN''
From MQB and MLBevo:
'Calculation see specification 'End-to-End communication security'
End values see accompanying document 'S-PDU identification sequences
238 | 34 | 37 | 32 | 0 | 107 | 252 | 216 |
99 | 35 | 37 | 32 | 0 | 99 | 252 | 92 |
126 | 36 | 37 | 32 | 0 | 123 | 252 | 94 |
243 | 37 | 37 | 32 | 0 | 115 | 252 | 218 |
75 | 38 | 37 | 32 | 0 | 107 | 252 | 121 |
198 | 39 | 37 | 32 | 0 | 99 | 252 | 253 |
190 | 40 | 37 | 32 | 0 | 123 | 252 | 146 |
51 | 41 | 37 | 32 | 0 | 115 | 252 | 22 |
139 | 42 | 37 | 32 | 0 | 107 | 252 | 181 |
6 | 43 | 37 | 32 | 0 | 99 | 252 | 49 |
27 | 44 | 37 | 32 | 0 | 123 | 252 | 51 |
150 | 45 | 37 | 32 | 0 | 115 | 252 | 183 |
46 | 46 | 37 | 32 | 0 | 107 | 252 | 20 |
163 | 47 | 37 | 32 | 0 | 99 | 252 | 144 |
219 | 32 | 37 | 32 | 0 | 123 | 252 | 255 |
86 | 33 | 37 | 32 | 0 | 115 | 252 | 123 |
238 | 34 | 37 | 32 | 0 | 107 | 252 | 216 |
99 | 35 | 37 | 32 | 0 | 99 | 252 | 92 |
126 | 36 | 37 | 32 | 0 | 123 | 252 | 94 |
243 | 37 | 37 | 32 | 0 | 115 | 252 | 218 |
06-25-2024 04:20 AM
Hi lab,
@electronic_lab wrote:
The first byte (byte 0) is a CHK which is The XOR of the rest of bytes + 134. 134 is the ID.
I would like to find out what is the formula for the CRC.
You write down the formula (XOR all bytes except first one and add 134) and then you ask for the formula in the next sentence???
06-25-2024 06:04 AM - edited 06-25-2024 06:04 AM