[Tinyos-help] FCS - TinyOS 1.x (Tmote)

[Joe Polastre]

The FCS isn't transmitted over the serial port.

-Joe

On 11/1/06, Terence Joseph <tjormor at hotmail.com> wrote:
> Hi,
>
> I am collecting data on the serial port and I was just wondering over which
> fields the FCS is calculated in software as I can't seem to reproduce the
> value I see?
>
> The raw packet is the following (including esc chars):
>
> 7E 42 00 01 08 AA FF FF FF FF 04 7D 5D F0 CE 7E
>
> The FCS is the third and second last byte: 0xCEFO.  There is no data payload
> (hence 00 for 3rd byte).
>
> Over which fields is the FCS calculated?  The length field is normally not
> included so I assumed it was just these byte {01 08 AA FF FF FF FF 04 7D 5D}
> but if you check any online CRC calc. this does not prodcue 0xCEFO.
>
> Can anyone clarify.  Any help is much appreciated, thanks.
>
> Best Regards,
> Terence.
>
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