Hi!
On Mon, 12 Jan 2009, lei lu wrote:
> Hi there,
>
> I am a little confused about sending or receiving a packet by using
> component DefaultLpl. My question is can this component be used to send and
> receive a packet?
The DefaultLplC/P (and also PowerCycleC/P) are involved in implementing
the LPL but you don't have to wire directly to them in order to use the
LPL.
> Because when I try to understand example TestLpl in /apps/tests/TestLpl,
> it seems that it uses ActiveMessageC to send or receive packet.
The DefaultLplC is wired to the SplitControl in CC2420ActiveMessageC from
lib/cc2420 and then the ActiveMessageC is equated to CC2420ActiveMessageC
in platforms/telosa.
> In that example, interface LowPowerListening is just responsible for
> starting and stopping Radio periodically.
This is a little incorrect. The starting and stopping of the duty-cycling is
done using the SplitInterface from the ActiveMessageC. What the
LowPowerListening interface allows is adjusting the sleep intervals (or
duty-cycle) for probing and sending. The probing is a global setting while
the sending is per-packet.
> But when I read the source code of DefaultLpl and PowerCycle, I found
> that it does provide send and receive interface and implement these two
> interface. So will it be possible to use these functions be used? Anyone
> tried that before?
The Send and Receive you see there are stacked together with the other
components from the cc2420. Here is a diagram of how the send path looks
like:
CC2420ActiveMessageC
|
CC2420ActiveMessageP
|
UniqueSendC
|
PacketLinkC
|
DefaultLplC/DummyLplC
|
CC2420TinyOSNetwork
|
CsmaC
|
CsmaP
And the receive path looks like this:
CC2420ActiveMessageC
|
CC2420ActiveMessageP
|
DefaultLplC/DummyLplC
|
UniqueReceiveC
|
CC2420TinyOSNetwork
|
CsmaC
|
CsmaP
> Please enlighten me. I will really appreciate your help.
Let me know if what I said above doesn't clarify the things.
All the best!
Razvan ME
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