logic analyzer will help? or oscilloscope is needed?
No you need the camera and the code and an understanding of how it works.
That said I have a feeling that @Marc_Dornan had one of these and they might support the remote protocol which I am in the process of fixing. So it’s worth trying my PR when it’s ready and reporting the results. I have also added significantly improved debug, so we might be able to tell what’s wrong that way.
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My PR is merged so if you build master you will get the latest changes. I am working on doc updates. Work in progress: https://github.com/ArduPilot/ardupilot_wiki/blob/6f6b020e7fc6aace53405428f8b07e5763c788f2/common/source/docs/common-camera-runcam.rst#id3
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Nice work. I will be trying this out on a 7 inch quad soon.
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Just a nice little story here. I took my new build out yesterday and found I had mounted the camera (split micro 3s) upside down. It took me 15s to fix because I was immediately able to access the setup menu through the OSD and select flip image 
I did find a small bug though
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I have to see if I can make a test-rig for my RunCam2 to see if it’ll work with your driver. I wasn’t able to find anything about its protocol, uART, or anything else. They’re… not fantastic with documentation at times.
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sorry, i made a mistake
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Should work fine - I have tested with a split 2s
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Oh, I see that they’re using the same harness. Fingers crossed then!
Thanks so much for your work on this, @andyp1per.
Does this work on the Runcam Control Adapter ( https://shop.runcam.com/runcam-control-adapter/ )?
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No idea, but you would think this converts the old-style OSD control into the RunCam serial protocol. So I would say there is a great chance that it works.
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Consider me your beta tester 
I will report back.
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The Runcam Control Adapter works perfectly.
Thanks again for your contribution of this code. It’s a great feature, @andyp1per.
Perfect. Let me know if you notice any issues. The state machine is relatively complex and I can imagine there are still some gremlins in there
I see runcam has officially released the split firmware with the parameter fix: https://www.runcam.com/download/runcamsplit3series
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Please, can be also Runcam 2 4K controlled by AP? This camera has only one Remote control pin. Could it be connected to a GPIO?
Can you post a link to the camera?
This just supports PWM control - you can do this via the relay support in ardupilot