[Tinyos-devel] start/stop with lpl

[Razvan Musaloiu-E.]

Hi!

On Sat, 13 Dec 2008, Philip Levis wrote:

>
> On Dec 12, 2008, at 10:10 PM, Omprakash Gnawali wrote:
>
>> During net2 meeting today, Razvan brought up an interesting
>> observation. With LPL, stdcontrol.start means turn the radio off.
>> stdcontrol.startdone means the radio has turned off. To someone who
>> just knows that LPL means dutycycling but does not know the
>> mechanisms, this seems opposite of what those names suggest.
>
> I don't understand; can you be clearer? SplitControl on what
> component? How is the radio on without calling start?
>

The SplitControl in discussion is the one implemented by PowerCycleC 
(which gets wired to ActiveMessageC through DefaultLplC and 
CC2420ActiveMessageC). The confusion comes from the interaction between 
the the SplitControl and the setLocalSleepInterval command from the 
LowPowerListening Interface.

Here are some questions that shows this.

   What happens when a call to LowPowerListening.setLocalSleepInterval is
   made? Does the duty-cycles starts immediately or I still need to do call
   SplitControl.start?

   If I'm duty-cyclying and I make a call to SplitControl.stop what will
   happen? Will the radio be turned on and a SplitControl.stopDone
   signaled?

   If I'm calling LowPowerListening.setLocalSleepInterval with a value of
   zero what will happen? The interface comments in the interface says that
   the radio will always on but will I get a signal what let's me know when
   the radio reach that state? Will it be startDone or stopDone? Which one?

--
Razvan ME