[Tinyos-help] Re: [Tinyos-devel] CTP + LPL

Matt Welsh mdw at eecs.harvard.edu
Wed Feb 6 14:10:23 PST 2008

While I like this idea, are we going through a TEP vetting process  
before adding new calls in the radio stack interface? I could think of  
a lot of things that one might want to add to the CC2420 radio stack  
but I thought the idea of the TEP process was to air these ideas  
through feature extension proposals before just adding things when  
they seem like a good idea. Then again maybe we need to draw a  
distinction between "public" interfaces and "private" ones; I suppose  
one could consider the internals of the CC2420 stack to be "private"  
-- that is until any upper level code starts relying on the existence  
of this interface and makes it impossible to port to other radio stacks.

On Feb 5, 2008, at 8:26 AM, David Moss wrote:

> I just added a hook to the CC2420 radio stack in CVS to configure an  
> outbound message. The interface is called SendNotifier, and has a  
> single event:
>   event void aboutToSend(am_addr_t addr, message_t *msg);
> This event is provided by CC2420ActiveMessageC, and is parameterized  
> by am_id_t.
> You can access this interface to configure packets sent by any  
> module in your application, modifying the outbound packet based on  
> AM type, destination, etc.  The main intention is CTP + LPL  
> integration (with examples attached – modify as necessary), but you  
> can use it to add all sorts of system-wide functionality to your  
> application.  Here’s a small example:
>   event void SendNotifier.aboutToSend[AM_CTP_DATA](am_addr_t addr,  
> message_t *msg) {
>     call LowPowerListening.setRxSleepInterval(msg, 512);
>   }
> Simply create a module that defines an LPL policy for your system,  
> and use the SendNotifier interface to enforce it.
> If this hook works out, we can extend this to other radio stacks as  
> necessary.
> -David
> <CtpLplC.nc><CtpLplP.nc>
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