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Capturing while zoomed drops the data

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Capturing while zoomed drops the data

Postby denizcan » Mon Sep 11, 2017 2:58 pm

I zoomed a capture, than captured next buffer. When I scroll the buffer, the data before and after the current page is not drawn.. The following pictures explain better:

I captured while zoomed:
CaptureWhileZoomed.PNG


After left scroll
LeftScroll.PNG


After right scroll
RightScroll.PNG


As you can see, in the Zoom Overview, the buffer looks correct. Also serial decoder decodes correctly as well. Which means signal before and after the visible portion are captured correctly.. However the graphics outside the visible range at the time of capture is now drawn..

I think this is not the correct behaviour..
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Re: Capturing while zoomed drops the data

Postby bennog » Tue Sep 12, 2017 5:43 am

I have seen this problem yesterday for the first time in the beta version of the software.

It seems to happen only when trigger is active and the capturing is still running.

If I have some time today I will investigate how to reproduce.

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Re: Capturing while zoomed drops the data

Postby bennog » Tue Sep 12, 2017 9:57 am

I can confirm it is only when triggering is active and capture is running.

The screen is updated as soon as the trigger fires or the capture is stopped.

Both picoscope 6 and 6 beta scope 4444

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Re: Capturing while zoomed drops the data

Postby Martyn » Tue Sep 12, 2017 10:05 am

If a PicoScope is still running it is not possible to read out detailed data from the scopes buffer, and changing the zoom region will not refresh the main display.
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Re: Capturing while zoomed drops the data

Postby denizcan » Tue Sep 12, 2017 10:51 am

I can confirm to navigate I have to stop the capture.. I can also add that when you zoom in the zoom trace is not as sharp as it should be..

Martyn wrote:If a PicoScope is still running it is not possible to read out detailed data from the scopes buffer, and changing the zoom region will not refresh the main display.


Does that mean that device only sends data just enough to display but the whole buffer while running a capture?
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Re: Capturing while zoomed drops the data

Postby lab!fyi » Tue Sep 12, 2017 11:13 am

But it is still capturing non-detailed data then. Why not draw it instead of blank? You already have some sort of min/max style "uncertain" trace sometimes used in ETS, waiting for detailed data etc. Would prefer dashed line(s) however (bordering "uncertain" region).
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Re: Capturing while zoomed drops the data

Postby Martyn » Mon Sep 18, 2017 12:40 pm

We only collect enough data, the rest of the data remains on the device in the waveform buffer, this helps to ensure a minimum rearm time between buffers.
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