[Tinyos-help] AM Group Address Verfication in CC2420

[renjie huang]

Group ID is checked in software. CC2420 chip only cares about address.

On 3/24/08, Greg Hackmann <gwh2 at cse.wustl.edu> wrote:
>
> Dodda Venkatappa Manjunath wrote:
> >     As the TOS_GROUP_ID is written into CC2420's RAM (m_pan in writeId()
> > of CC2420ControlP ), I am wondering whether a message that does not
> > belong to the
> > node's GROUP is dropped in a software component or CC2420 chip. I was
> > not able to find the corresponding code in any of the software
> > components consituting CC2420 based AM stack.
>
> The CC2420 chip has a feature called hardware address recognition, which
> will automatically drop any packets addressed to another node (including
> nodes in other AM groups).  TinyOS's CC2420 stack enables this feature
> by default.  It can be disabled at compile-time by #defining
> CC2420_NO_ADDRESS_RECOGNITION, or at runtime by calling the
> setAddressRecognition() command on CC2420ControlC's CC2420Config
> interface.
>
> Greg Hackmann
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>



-- 
Renjie Huang
Sensorweb Research Laboratory
http://sensorweb.vancouver.wsu.edu/
Washington State University
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