Thanks for that but could you please tell me then what the third and second
last bytes represent (F0 CE in the example below)? They are not data but
come after the data field.
Regards,
Terence.
From: "Joe Polastre" <[EMAIL PROTECTED]>
To: "Terence Joseph" <[EMAIL PROTECTED]>
CC: [email protected]
Subject: Re: [Tinyos-help] FCS - TinyOS 1.x (Tmote)
Date: Fri, 3 Nov 2006 09:06:26 -0800
The FCS isn't transmitted over the serial port.
-Joe
On 11/1/06, Terence Joseph <[EMAIL PROTECTED]> 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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