[Tinyos-help] Again!!!! Low-power CC2420 multihop in TinyOS2.x question????

[Roman Lim]

Hi

In order to use lpl with ctp you could modify the ctpforwarding engine
and add the lpl information for transmission.
I added an interface where you can tell the ctp layer to use a default
rx sleep interval for forwarded packets.

roman

Ravi Prasad wrote:
> Dear Philip,
> 
> Thank you for your reply.
> 
> As you said that CC2420 LPL in Tinyos2.x works with
> arbitrary topologies, I tried to use LPL with
> collection protocol provided in tinyos2.0.2. I used
> the LowPowerListening interface in my top level
> application  to set the sleep interval of TX and Rx
> sides. The application somehow worked with one
> transmitter & one receiver. But the lowest current
> consumption was 4mA which is very huge. Also the
> initial tree formation time is very big. If I use a
> sleep interval of more than 3seconds the tree dosent
> even forms and nothing works.
> 
> I think as the CollectionTree also uses ActiveMessage
> to send/receive data/routing packets, the
> sleepinterval setting should be controlled at a single
> point from where all packets (i.e routing and data)
> flow, that is the ActiveMessage component.
> 
> Can you please comment on the above?
> 
> Also it would be great if you have some suggestion to
> use another multihop routing on top of CC2420LPL.
> 
> 
> Regards
> Ravi
> --- Philip Levis <pal at cs.stanford.edu> wrote:
> 
>> Ravi Prasad wrote:
>>> Hi all,
>>>
>>> My need - Low power multihop for CC2420 (with
>>> Atmega128 mcu i.e micaz)..
>>>
>>>
>>> Low power CC2420 is being asked so many times in
>> this
>>> list. I have been working on TinyOS1.x and in that
>> low
>>> power CC2420 was not really available.
>>>
>>> Now I have switched to TinyOS2.x and I know that
>> there
>>> is a LPL implementation of CC2420. But it seems
>> that
>>> is for a Star network topology & not used in any
>>> multihop routing protocol. Am I right??
>>>   
>> The CC2420 LPL in 2.x works for arbitrary
>> topologies.
>>
>> Phil
>>
> 
> 
> 
>        
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