On Jul 19, 2019, at 9:26 AM, Tomasz Moń <deso...@gmail.com> wrote: > The CRC-5/USB is not so straightforward as it does not operate on the > byte boundary. The CRC-5/USB is calculated on 11 bits of data. I think > there are two possible approaches to check the CRC-5/USB in Wireshark: > 1. Compute the CRC5 bitwise on the 11 bits of data, or > 2. Compute the CRC5 with table-based algorithm on 2 bytes (11 bits > data + 5 bits CRC) and relying on the CRC properties expect fixed > output.
Meaning that if you run the CRC on the entire Link Control Word, including the 5-bit CRC and the remaining 11 bits, the result should be a fixed value? (Is that what "The residual of CRC-5 shall be 01100b." is referring to?) If the goal is just to check the CRC, approach 2) seems as if it's as good as approach 1), and may involve a simpler implementation. ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> Archives: https://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe
