Hi Jong Chern, Thanks for your reply!
I use Shimmer Android Driver Library - Beta 0.5 with Android 4.2.1. Kind regards, Leonid On Tue, Dec 4, 2012 at 11:19 AM, Jong Chern Lim <[email protected]>wrote: > Hi Leonid,**** > > ** ** > > I did a similar setup on my Nexus 7 and didn’t face the same issues. Just > a few quick questions so I can try to replicate the problem, **** > > ** ** > > Which Android Version are you using? Which Shimmer Android Instrument > Driver are you using? **** > > ** ** > > Best regards,**** > > JC**** > > ** ** > > ** ** > > ** ** > ------------------------------ > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Leonid Ivonin > *Sent:* 03 December 2012 21:03 > *To:* [email protected] > *Subject:* [Shimmer-users] Android Driver for Shimmer + High Frequency > Sampling**** > > ** ** > > Hello,**** > > ** ** > > I have downloaded Shimmer Android driver and run ShimmerGraph application > with a GSR sensor (Boilerplate firmware) configured to stream data at 512 > Hz. I have noticed that after some time (1-2 minutes) the application stops > updating the plot. No new data points are being added to the plot. The LED > light on the connected Shimmer sensor keeps flashing meaning the sensor > still streams data. The GUI of the app does not freeze and responds to > touches.**** > > ** ** > > I have decided to do some research and imported the code of Shimmer driver > (shimmer.jar) to Eclipse and added two log outputs into the code to trace > where the app gets stuck with the updating of the plot. I added these two > log outputs to the method 'run' of the class 'ConnectedThread'. The first > output is before the line 'mmInStream.read(tb,0,1);', the second output is > after this line. So, it looks like this:**** > > ** ** > > Log.i("Shimmer", "BEFORE_READ");**** > > mmInStream.read(tb,0,1);**** > > Log.i("Shimmer", "AFTER_READ");**** > > ** ** > > I repeated my test with the modified Shimmer driver and learnt that the > app stops updating the plot because the function 'read' of the input stream > 'mmInStream' does not return anything and blocks the thread. Does anybody > have an idea why does it happen? The sensor keeps blinking so I suppose it > continues streaming data. Also no exception is triggered by the 'read' > function. I ran the app on Nexus 7 tablet.**** > > ** ** > > If if the sensor is set to lower sampling frequencies (e.g., 128Hz or > 256Hz) then the problem I described does not occur (or I just did not wait > long enough?). Why is that?**** > > ** ** > > If you have any ideas I would really appreciate if you could share them.** > ** > > ** ** > > Thanks,**** > > ** ** > > Leo **** >
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