[Tinyos-help] Documentation regarding exact contents of the MAC Protocol Data Unit frame

[Pedro Almeida]

Hello, Alexander;

I'm using a micaz, so it is CC2420 indeed.
I've looked into the Zigbee specification, 802.15.4 frame formats and
understood (I believe, even if lightly) the frame formats.
But I am not sure of what the 32 bytes I receive are, exactly. Is it the
complete PPDU? There is a group (Address Information) that is from 0 to 20
bytes, and I dont know if they're there and if yes, how many. Neither do I
know for sure if I am actually receiving, within those 32 bytes, the SHR and
PHR of the PPDU or if I only get the MPDU. That is the difference between
understanding if the 32 bytes are caused by the inclusion of the SHR and PHR
in the frames i'm reading from the serial port or if I'm only getting 32
bytes because of the 20 bytes from the Address Information in the MPDU.
Sounds confusing because i'm confused too!

Thank you for your reply, Alexander;

Sincerely,
Pedro


On 6/11/07, Alexander Becher <becher at i4.informatik.rwth-aachen.de> wrote:
>
> Hi,
>
> * Pedro Almeida:
> >I'm trying to look for documentation where I can understand the exact
> >contents, byte by byte, of the MPDU. I've looked into the TEPs and the
> >source files themselves, butI wasn't completely clear.
>
> the contents depend on your specific platform. For example, for a CC2420
> radio, you can read in its datasheet that it uses IEEE 802.15.4 packet
> format, and that standard gives you the exact packet format.
>
> Regards,
> Alexander
>
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