AVR-Chat

could it be a byte order problem in the computed CRC or the polynomial?

--- In AVR-Chat@yahoogroups.com, Dede <dewa27@...> wrote:
>
> 
> J
> 
> 
> ----- Original Message -----
> From: wagnerj@...
> Sent: 05 May 2010 11:13
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] CRC using IAR compiler
> 
>  
> > I'm using the IAR compiler V5.11 or 5.12 and need to use the feature
>  > that has the linker write a CRC in the last two bytes of the executable.
>  >
>  > I got the linker to write the CRC and I am able to read it back. The
>  > problem is, I can't manage to compute the same one. I have tried
>  > several different routines to generate the CRC and they agree with
>  > each other, but not with what IAR computes. In each case, it is
>  > supposed to be a CRC 16 of the CCITT variety with 0x1021 as the
>  > polynomial.
>  >
>  > Has anyone gotten this to work? Is there some sample code somewhere
>  > that has been shown to work with the IAR computed CRC?
>  >
>  > Thanks.
>  >
> 
>  PS - sorry for misspelling your name!
> 
>  Jim Wagner
> 
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