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Rigol MSO5074 Logic Analyzer issues

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jerryk:
I'm trying to debug an initializer function for an I2C library that I want to work with an LCD and a pic microcontroller.  I figured the MSO5074 would be quite capable as I have used it previously for the exact same thing but via serial communication.

Attached are some images at various resolutions of my problem.  Basically the decode trace decoded data disappears when I zoom past 20ms making the LA function on this scope useless.  I must or hope I'm doing something wrong.  Any ideas what I'm missing here?

On the paranoid end of things I did the upgrade hack recently and hoping that did not cause a foul.

Jerry

 

thm_w:
For this sort of task you are better off with a $10 USB logic analyzer and sigrok.
You are writing the code on the PC, why not use the PC to also look at the I2C data.

https://www.eevblog.com/forum/testgear/saleae-logic-pro-16-vs-rigol-mso5000-series/

Its not related to the hack.

jerryk:
Thanks. I appreciate and will consider your suggestion.   However,  I'm just wanting to use what I have at this moment and I'm in disbelief that this is really all the decode capability of the MSO5074 of an I2C signal.  Without being able to zoom in on individual packets I'm left to manually decode the majority of the signal.  Something seem faulty and I'm sure it's on my end.  Otherwise, the LA on the MSO5074 is useless for my purpose.  Still hoping for an answer.

Jerry

tggzzz:
General principle: use an analogue domain tool (scope) to assess analogue properties (signal integrity and timing). Once SI is assured, flip to the digital domain and use digital domain tools (LA, protocol analyser, printf() ).

I have heard that low-end Rigol scope only analyse what's visible on the screen, not what's in their entire capture buffer. If that is the case, yes, they do become less than useful. Important caveat: I do not have any Rigol equipment, so those statements are worth what you paid for them. Check with more knowledgeable people.

2N3055:

--- Quote from: tggzzz on September 21, 2024, 09:06:18 am ---General principle: use an analogue domain tool (scope) to assess analogue properties (signal integrity and timing). Once SI is assured, flip to the digital domain and use digital domain tools (LA, protocol analyser, printf() ).

I have heard that low-end Rigol scope only analyse what's visible on the screen, not what's in their entire capture buffer. If that is the case, yes, they do become less than useful. Important caveat: I do not have any Rigol equipment, so those statements are worth what you paid for them. Check with more knowledgeable people.

--- End quote ---

If you read again, his problem is that scope stops decoding after time base is slower that certain value. His data IS on screen.Screen IS entire capture buffer.

EDIT: Sorry..  Thanks @NE666!

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