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I2C decode on scope

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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 4 years ago
Posts: 7140
Topic starter  

I have a RIGOL DHO802 scope. It can decode I2C. I have followed the instructions as well as I am able but all I see is 99% of the time what looks like random noise, and very occasionally what looks like a signal but it just flashes on then off.

It has been 50 years since I used a scope and then only occasionally. This scope has a setup screen with some very basic things to set up like what channel is SCL and SDA.

I have done some Google searches but don't see anything helpful. Instructions for another scope is of no help to me.

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.


   
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(@scsiraidguru)
Member
Joined: 2 months ago
Posts: 59
 

I did a I2C project with my Siglent SDS-1104X-E 100 Mhz, 4 channel Oscilloscope with LAN

https://mc.scsiraidguru.com/index.php/i2c/


   
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Ron
 Ron
(@zander)
Father of a miniature Wookie
Joined: 4 years ago
Posts: 7140
Topic starter  

@scsiraidguru Even if I had the same scope as you that post contains no information about scope settings. Since I have a different scope it will not be possible for you to tell me what each knob and dial and menu setting has to be to get it to work.

So far I mostly see what I would call static.

I have managed to get something that could be called a waveform, but nothing even remotely like I2C.

Thanks for the effort.

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.


   
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(@scsiraidguru)
Member
Joined: 2 months ago
Posts: 59
 

I2C is just a square wave with each address.   I have 9 Arduinos that registered.   I was going to get deeper into it once I get this I2C project done.   Those QWIIC multiport devices will be the best way to go with an I2C extender.   I check with Siglent on collecting the data.  

image

   
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