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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