On 29 Apr 2006 at 14:00, Harley Shanko wrote:
 
> Seems to be a dozen or more types of CRC.  Confusing.  And they talk of
> dividing.  HELP!  My design is using a PIC12F629/675 (because it was
> in-hand) and there is no divide instruction.

You don't need a divide.

> Does anyone happen to know what the CRC algorithm is used with ECUs with VPW
> protocol?

I made an interface about 5 or 6 years ago. It's an 8-bit CRC. I 
forget the polynomial but I can probably put my hand on it in the next 
few days.

You'll need to be pretty tricky to do the CRC in realtime along with 
banging the bus at 4 (or 8) MHz.

Cheers,

Bob

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