CRC protection calculation
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muehlpower
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CRC protection calculation
Hello, I have to send a CAN message with CRC, I know that the protection is according to Autosar_SWS_E2ELibrary Profile 1C. Where can I find a rule on how the CRC is calculated?
Re: CRC protection calculation
Looks like it's an xor of the bytes. See page 19
https://www.autosar.org/fileadmin/user_ ... otocol.pdf
https://www.autosar.org/fileadmin/user_ ... otocol.pdf
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muehlpower
- Posts: 692
- Joined: Fri Oct 11, 2019 10:51 am
- Location: Germany Fürstenfeldbruck
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Re: CRC protection calculation
Dilbert wrote: ↑Sat Dec 05, 2020 8:17 pm Looks like it's an xor of the bytes. See page 19
https://www.autosar.org/fileadmin/user_ ... otocol.pdf
I think you are right. I've found a very good site. There you can calculate CRCs online to check your own routine. There is also a link for explanation with C ++ examples.
http://www.sunshine2k.de/coding/javascr ... rc_js.html
Re: CRC protection calculation
Yes i've done it for J1939 before and from memory, it was an XOR of the bytes so not really a true CRC.