Re: [Contiki-developers] How to Put TelosB sleeping/waking

[Adam D. <ad...@si...>]

Hi,

I think you need to define exactly what you mean with "sleep": there are 
numerous parts of the system that can be powered down (radio, sensors, 
CPU, timers, etc) so there are many definitions of "sleep". In the most 
extreme "sleep", nothing is turned on and the CPU must be woken up by an 
external input. In a more modest "sleep", the system runs but the radio 
is completely off. In a slightly less sleepy state, the system is 
running and the radio is duty cycled so the system can be reached from 
the outside. Etc.

In either case, Contiki has the CPU in low-power mode most of the time, 
regardless of how the radio or other components are handled.

/adam

On 2010-10-07 20:59, Bruno Filipe Marques wrote:
> Hi Adam,
> Hi Marek,
> Hi List,
>
> On 2010/10/07, at 17:09, Adam Dunkels wrote:
> Marek's appointments give me some hints. Thanks !
>> In addition to Marek's pointers to the on() and off() MAC methods, I
>> would just point out that in the current CVS code, as well as in
>> upcoming releases, the nullmac code has been split into two parts: a
>> nullrdc.c that implements a duty cycling layer that does not do any duty
>> cycling, and nullmac.c that implements a medium access control layer
>> (collision management, etc) that does not do any mac mechanisms.
>>
>
> But, Adam, sorry about my small knowledge about Contiki !
>
> NETSTACK_RDC.off(0) put the node really in sleep mode, or just the radio ?
>
> Same question about NETSTACK_RDC.on() wakes the node, or only the radio ?
>
> These questions are important to me, because I'm working on a WSN design solution that needs to put the node sleep for a while, and wake up for another period for activities purposes, including sensing and communicate.
>
> /bruno
>
>> Bruno: I would have used either nullrdc or contikimac as the RDC layer,
>> and then had a process that would call NETSTACK_RDC.off(0) and
>> NETSTACK_RDC.on() to put the node to sleep and to wake it up, respectively.
>>
>> Use Cooja/MSPsim and the TimeLine to ensure that your code does what it
>> is supposed to, i.e. that the radio is actually off when you want it to
>> be off.
>>
>> /adam
>>
>> On 2010-10-07 17:17, Marek Bykowski wrote:
>>> Hello Bruno,
>>>
>>> Look at the MAC routines such as on() and off(). If I had that task I
>>> would try to accomplish it at the MAC layer. All the available MACs are in
>>> ./core/net/mac
>>>
>>> Selection of a MAC for example for Tmote Sky is in
>>> ./platform/sky/contiki-conf.h (or so may mix the syntax).
>>>
>>> First off as it is easiest to acquaint yourself have a look at the
>>> nullmac. Maybe if you don't need any MAC use nullmac. If there are more
>>> nodes transmitting at the same time/almost the same time use any other
>>> MAC as using nullmac may end up with collisions.
>>>
>>> Best luck,
>>> Marek
>>>
>>>
>>> On 7 October 2010 16:12, Bruno Filipe Marques<bm...@es...
>>> <mailto:bm...@es...>>  wrote:
>>>
>>>     Hi all,
>>>
>>>     I am wondering if someone could help me on this:
>>>
>>>     I need to wake a telosB node for 30 seconds for activity, then he
>>>     must sleep for one minute to wake again for 30 seconds, and so on.
>>>
>>>     Any help ?
>>>
>>>     Thanks in advance,
>>>     /bruno
>>>     ------------------------------------------------------------
>>>     Bruno Filipe Marques,
>>>     MsC in Electrical and Computer Engineering
>>>
>>>     FCT PhD Schollarship (SFRH/BD/36221/2007)
>>>
>>>     PhD Student @ DEEC/FEUP
>>>     WiN, Wireless Networks
>>>     UTM, INESC Porto,
>>>     http://win.inescporto.pt/
>>>
>>>     Electrical Engineering Department
>>>     School of Technology and Management
>>>     Polytechnic Institute of Viseu,
>>>     Portugal
>>>
>>>     url: http://www.estv.ipv.pt/paginaspessoais/bmarq/
>>>     e-mail: bm...@es...<mailto:bm...@es...>
>>>
>>>     MSN: bm...@ip...<mailto:bm...@ip...>
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>>
>> --
>> Adam Dunkels<ad...@si...>  | +46 70 7731614 | http://www.sics.se/~adam/
>> Book: Interconnecting Smart Objects with IP - http://TheNextInternet.org
>>
>> ------------------------------------------------------------------------------
>> Beautiful is writing same markup. Internet Explorer 9 supports
>> standards for HTML5, CSS3, SVG 1.1,  ECMAScript5, and DOM L2&  L3.
>> Spend less time writing and  rewriting code and more time creating great
>> experiences on the web. Be a part of the beta today.
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>
> ------------------------------------------------------------
> Bruno Filipe Marques,
> MsC in Electrical and Computer Engineering
>
> FCT PhD Schollarship (SFRH/BD/36221/2007)
>
> PhD Student @ DEEC/FEUP
> WiN, Wireless Networks
> UTM, INESC Porto,
> http://win.inescporto.pt/
>
> Electrical Engineering Department
> School of Technology and Management
> Polytechnic Institute of Viseu,
> Portugal
>
> url: http://www.estv.ipv.pt/paginaspessoais/bmarq/
> e-mail: bm...@es...
>
> MSN: bm...@ip...
> Skype: bmarq2k5
> Facebook: http://www.facebook.com/bmarq
> Twitter: http://twitter.com/bmarq2k9
>
>

-- 
Adam Dunkels <ad...@si...> | +46 70 7731614 | http://www.sics.se/~adam/
Book: Interconnecting Smart Objects with IP - http://TheNextInternet.org