On Wed, Jul 20, 2022 at 10:24 AM Karel Kočí <cyn...@email.cz> wrote: > > Sorry for the late response.. I was busy with life. > > No, NuttX's crc32 is returning 0x2DFD2D88! > My modified code with missing negation returns that 0x340BC6D9 but that is now > probably no longer relevant. We should now probably only consider what is the > NuttX's crc32 implementation at the moment so its usage would be clear. I > dragged there originally my requirement of the algorithm and in the end that > got > confusing. > > The parameters that give me same test value from NuttX code as on crc_js.html: > > Input reflected: yes > Result reflected: yes > Polynomial: 0x4C11DB7 > Initial Value: 0x0 > Final Xor Value: 0x0
snip > The NuttX's implementation should be probably something like `crc32_posixlike` > as it is not even POSIX compliant implementation due to the input and output > not > being reflected and output not being negated. Thus possibly `crc32_nuttx`. To clarify, you're saying that: In POSIX the input and output are NOT reflected and the output is NOT negated, and: In NuttX the input and output ARE reflected and the output IS negated? Thanks, Nathan
