[Tinyos-help] Suspending the MicaZ radio (CC2420)

[Ravi Prasad]

Hi,

I am not aware of the problem of adc data corruption
on Micaz.

But I have succesfully used manual (means application
layer controlled) radio turn On/Off in my
applications. My application made radio On for 200ms
every 10 sec for saving power. (as micaz-CC2420 didnt
have low power implementation in 1.1.14. And still I
think low power micaz-cc2420 is not stabilized in
tinyos2.0 also)


Any way, if your need matches this, I can give you the
code.


BTW I used TinyOS1.1.14, which I think is not much
diferent from 1.1.15 in terms of Radio.


Regards


--- Philip Levis <pal at cs.stanford.edu> wrote:

> On Feb 2, 2007, at 8:40 AM, Michael Collett wrote:
> 
> >
> > Hi,
> >
> > Platform: MicaZ
> > OS: TinyOS 1.15 (I think, definitely not 2.0)
> > Application: Adapted from OscilloscopeRF
> >
> > I've noticed that during readings of the ADC,
> radio activity  
> > (reception or transmission) can cause the data to
> change  
> > dramatically (probably due to the drain on the
> power supply for the  
> > ADC reference voltage). I've tried calling
> ComControl.stop() and  
> > CommControl.start() either side of taking data,
> but the radio  
> > doesn't seem to start back up again.
> >
> > Is there a way to suspend the radio during a
> measurement to prevent  
> > the data being affected. I know that I could just
> set a lower  
> > sample rate and then have careful timing to stop
> them overlapping,  
> > but I would like to find a more rigorous way of
> solving the problem.
> 
> Geoffrey Werner-Allen (Harvard) noted this issue in
> his recent paper  
> in OSDI on a Volcano deployment. The paper says they
> fixed the  
> problem, so he might have code for this purpose.
> 
> Phil
> _______________________________________________
> Tinyos-help mailing list
> Tinyos-help at Millennium.Berkeley.EDU
>
https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
> 



 
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