[Tinyos-devel] Patches to FTSP and CC2420 for 32kHz sync and LPL functionality

[Omprakash Gnawali]

On Sat, Jun 27, 2009 at 10:41 AM, Philip Levis<pal at cs.stanford.edu> wrote:
>
> On Jun 26, 2009, at 6:35 PM, Razvan Musaloiu-E. wrote:
>
>> I update the default-lpl-new branch to use a
>> SystemLowPowerListeningC instead of DefaultLplSettingsC. The new
>> interface is like this:
>>
>> interface SystemLowPowerListening
>> {
>>  command void setLocalSleepInterval(uint16_t interval);
>>  command void setRxSleepInterval(uint16_t interval);
>>  command void setDelayAfterReceive(uint16_t interval);
>>
>>  command uint16_t getRxSleepInterval();
>>  command uint16_t getDelayAfterReceive();
>> }
>>
>> The setX calls are used by the user application while the getX are
>> used by LplAMSenderP and DefaulLplP. One drawback of this is the
>> fact that it doesn't prevent the user from calling the setX at the
>> wrong time. :|
>
> This looks good -- I think my one comment would be to change
> RxSleepInterval to DefaultDestinationSleepInterval. That seems clearer
> to me.
>
> I agree on the issues with the set calls. One solution here is that
> you have an error_t return value, with can return FAIL if done at the
> wrong time (e.g., radio is on).

This might preclude something like NoSE which sets different sleep
intervals at different times. Here is a link:
http://www.tik.ee.ethz.ch/~beutel/pub/MWWBT2009.pdf

- om_p