TPS274C65: CRC calculation in SPI interface

Hi Arnold,

Good question! I did find out that it's a 4 bit CRC with a starting value of 1111, and it has a generator polynomial of X⁴ + X + 1 .

I've reached out to our designer to get an explanation as to how the CRC is calculated, so I will get back to you with her answer as soon as I receive it.

Best regards,

Nate

Arnold,

Per our designer, 

CRC calculation starts from MSB.

In addressable mode, all 32 bits are included in CRC calculation. In daisy chain mode, all 24 bits are included.

Best regards,

Nate

please send us a code example for the calculation of the CRC-4 for this chip.

Arnold,

We are working on getting a CRC code example and will have this posted on E2E when completed.

Best Regards,
Tim

I have implemented a CRC-4 and verified within www.zorc.breitbandkatze.de/crc.html
(CRC-4, start value 0xF, generator polynomial X4 + X + 1)

I cannot communicate with the TPS274C65 with CRC because the chip calculates the CRC differently.
I therefore still need help.