ok.. Now I have tried with TimerMilli with a setOneshot(1) and I was getting a max of 660 samples/sec.Maybe I think I will increment the Samplecounter in the fired() event itself (as against incrementing it in the ADC.dataready(). just to see if ADC conversion is the bottleneck.
jagan On 5/18/06, Michael Schippling <[EMAIL PROTECTED]> wrote:
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 >> > >> > _______________________________________________ >> > Tinyos-help mailing list >> > Tinyos-help@Millennium.Berkeley.EDU >> > >> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@Millennium.Berkeley.EDU > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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