[Tinyos-help] CC2420_Header Structure

[Philip Levis]

On Jan 9, 2007, at 7:22 PM, Shuo Xiao wrote:

> Hi all,
>
> I am recently using Micaz platform plus Tinyos 2.0 to implement the  
> application BlinkToRadio. But when I used Listen tools to display  
> the messages sent from the mote, I didnot quite understand them.
>
> the message header received from the mote by radio is
>
> 00 FF FF 00 05 04 00 06
>
> Is this the default message header structure used in Tinyos 2.0,  
> that is
> Packet type(1 byte) + Dest addr (2 bytes) + Src addr (2 bytes) +  
> Message length (1 byte) + Group ID (1 byte) + Handler ID (1 byte)?
>
> Micaz platform uses CC2420 RF transceiver, but this message header  
> structure is quite different from the definition in Tinyos 2.0,  
> more specifically, in tinyos-2.x\tos\chips\cc2420\CC2420.h. How to  
> explain this?
>
> If there is a default message header structure in radio  
> transmission in Tinyos 2.0, Where can I find it?
>
> In addition, the first byte (00) indicates that this is an AM  
> packet. Where can I find the definition about this? And after the  
> message length byte (04), it should be the AM group id. Why I  
> received was 00, not the default 0x22?
>
> I am looking forward to your reply. Thanks a lot.

Please read TEP 113. The packet sent over the serial port is not a  
CC2420 packet. It is a platform independent serial packet.

Phil