Hi Randie!

It is not as simple as just giving a polynomial for the calculation of the
CRC
There is a lot of different "standards" like: 
How to initialise before calc.     all zeroes all ones ...
How to do with the result . Invert or not
Transmission order? LSB , Should the crc be calculated before bit reversal
or....
 
There is a very good article explaining most of this at this link
 
http://members.iquest.net/~jbuchana/CRC_explained.html

I f You have a byte sequence i can try to calculate the CRC for You
> ----------
> FrŒn:       Dr. Imre Bartfai[SMTP:root@PROF.PMMF.HU]
> Svara till:   pic microcontroller discussion list
> Skickat:       den 1 december 1998 08:19
> Till:         PICLIST@MITVMA.MIT.EDU
> AngŒende:   Re: CRC-16
> 
> <<Fil: crc16.inc.txt>>
> Hi,
> here is an implementation for your convenience. Remarks:
> - poly is a CRC polynomial, e.g. 0x1021
> - crcval is <crcl:crch>
> 
> Maybe the implementation is not optimal, but I use it extensively, w/o any
> problems.
> 
> Imre
> 
> 
> On Mon, 30 Nov 1998, Ohtsji, Randie wrote:
> 
> > Hello,
> >
> > I have seen a few implementations of generating CRC values but I wanted
> to
> > know if there is some known values which can be used to check if the CRC
> > algorithm is correct, as all the routines I have come across generate
> > different CRC values.
> >
> > For example, if the CRC is to be generated on a single byte, in this
> case
> > the value 'FF', what should the CRC value be?
> >
> > Also, if the CRC is to be generated on a string of bytes, such as, 'A0',
> > 'FF', '05', '02', '00', 'DE' etc. what should the end CRC value be?
> >
> > I am looking for a list inputs and outputs from a known good CRC-16
> > generator.
> >
> > I think the poly for CRC-16 is X16, X15, X2, and X0.
> >
> > I am trying to do this on a 16C63.
> >
> > Any help would be appreciated.
> >
> > Randie
> > randie.ohtsji@glenayre.com
> >
> >
>