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Capturing a bunch of CAN-frames, where one might be missing - (SDS800X)

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nctnico:
Keep in mind that most DSOs need a minimum oversampling rate. If the CAN rate is reasonably high, 5Ms/s may not allow decoding of the data. The first step is to determine the minimum samplerate at which the CAN messages are decoded reliably. Emphasis on reliably; I've seen DSOs attempt to decode but fail in a subtile way without warning; you end up with data which is garbage.

Martin72:
Yepp, can confirm this behaviour, it makes sense too.

@eTobey:


--- Quote ---The horizontal axis.
--- End quote ---

The way you might think it is not possible at first, which makes sense.
The number of frames is limited to 2000, which can be seen clearly at 2s/div, and even more clearly at 5s/div.
What you can do, however, is zoom in and scroll the section back and forth accordingly.


eTobey:

--- Quote from: Martin72 on March 24, 2024, 10:10:53 pm ---What you can do, however, is zoom in and scroll the section back and forth accordingly.

--- End quote ---

I did not say zoom... Take the first picture, and then move the trigger/scroll, so that decode frames will drop of to the left.

electronics hobbyist:
Your question is difficult to understand. You should take two comparison pictures instead of letting others try to understand your meaning."scroll" should be a horizontal position or trigger delay.

bobxyz:
The MCP2515 is a very common hobbyist CAN-to-SPI chip.  If you can program and are familiar with the Arduino environment, you could use a $20 CAN+Processor board, e.g. https://www.adafruit.com/product/5724, to decode the CAN stream live and generate a trigger for your oscilloscope.  This would let you zoom in on the analog waveforms.

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