Well, you should definitely call it AFTER all the component and
module inits and starts, otherwise the default will get reset.
And, as I said, I don't have any concrete knowledge that it actually
works the way it should. Maybe I should try it myself...
MS
jagan nath wrote:
---------- Forwarded message ----------
From: jagan nath <[EMAIL PROTECTED]>
Date: May 18, 2006 9:30 AM
Subject: Re: [Tinyos-help] Maximum samplingrate with TimerJiffy.nc
To: Michael Schippling <[EMAIL PROTECTED]>
I didnt miss that, i have set the ADCControl.setSamplingRate(7500ns),
only thing i m not sure is whether this command shud be called in
stdcontrl.init/start,
i have called it in stdcontrol.start(maybe i shud try it in init also)
jagan
On 5/18/06, Michael Schippling <[EMAIL PROTECTED]> wrote:
Everyone seems to be going on about this recently and I forget
to whom I have already responded with dubious advice...
You need to set the ADC pre-scaler to something other than the
maximum, which is the default. ADCControl.setSamplingRate() is
supposed to do this, see tos/interfaces/ADCControl.nc for details.
However I've only heard of negative results so far.
Have any of you lurkers actually used setSamplingRate() successfully?
MS
jagan nath wrote:
> Hello all,
> I'm using TimerJiffy.nc to sample the ADC0 pin for my application.I
> actually wanted to sample at 3Khz but the highest sampling rate i
> could achieve is not more than 1200 samples/sec.
>
> I'm calling TimerJiffy.setPeriodic(11); here 11 corresponds to
> 3Ksamples/sec(apprx).
> whenever the timer fires I'm call ADC.getdata() and in the event
> ADC.dataready() I'm incrementing a counter
> Now I'm using a normal timer which is set to fire at intervals of
> 10/20 secs and when this timer fires Im sending this counter value
> over the radio and receiving it with TOSBase.
>
> I then further reduced the value of Timerjiffy.setperiodic(5) .with
> this also i'm getting a max of 1200 samples/sec.
>
> Am I checking it correctly or is there any other method to achieve the
> 3Khz sampling rate.
>
> TIA
> Jagan
>
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