https://github.com/madler/crcany is what I have been using to make one off CRC implementations. Consolidating the various ones into a single library might be useful.
From: Alan Carvalho de Assis <acas...@gmail.com> Date: Friday, July 15, 2022 at 7:31 PM To: dev@nuttx.apache.org <dev@nuttx.apache.org> Subject: Re: CRC32 what gives? We also have CRC4 used by MS5611 barometer sensor. It should be nice to have all available in the kernel On Friday, July 15, 2022, Nimish Telang <nim...@telang.net.invalid> wrote: > Whichever one is chosen, there should be a table-free implementation for > code size reasons. FWIW there are more crc implementations in the zmodem > app: https://github.com/apache/incubator-nuttx-apps/blob/ > master/system/zmodem/host/crc16.c > > > > From: Sebastien Lorquet <sebast...@lorquet.fr> > Date: Friday, July 15, 2022 at 4:13 PM > To: dev@nuttx.apache.org <dev@nuttx.apache.org> > Subject: Re: CRC32 what gives? > @Nathan: > > Yes, of course. > > @Alan: > > Of course not, the structure passed to init can be set up to describe > the required algorithm. > > But the partial update situation can be useful for protocols where the > message is fragmented (eg radio transceivers with short FIFOs), or where > only some fields enter the crc (I have seen this happen several times). > you cant call the global crc() function on several buffers in sequence > if bits are inverted on crc output. > > Sebastien > > On 7/15/22 20:21, Nathan Hartman wrote: > > On Fri, Jul 15, 2022 at 1:40 PM Alan Carvalho de Assis > > <acas...@gmail.com> wrote: > >> Hi Sebastien, I think we don't need these three functions for each > >> CRC, just one like in the Linux kernel is enough: > >> > >> https://www.kernel.org/doc/htmldocs/kernel-api/API-crc-ccitt.html > >> > >> BR, > >> > >> Alan > > > > Could have one generic function and then thin wrappers that call it > > with the correct parameters for different uses. > > > > Cheers, > > Nathan >
