QHY600M - other readout modes does not working

[JBielanski]

Describe the bug
I have QHY600M camera, this camera has a readout modes 0 / 1 / 2 and 3. INDI driver default start with read mode 0 and it is working good. When I try to change read mode to 1 or other then camera stop working (I can not take an image). In INDI logs I found only one feed back information: "QHY CCD QHY600M-a7ca3c4: No response from camera!"
Camera back to normal when I restart INDI driver "indi_qhy_ccd", then it is perfect working on mode 0. Probably is something wrong with INDI camera read mode settings, because when I back from mode 1 to 0 and I tried to get image I always received information: "QHY CCD QHY600M-a7ca3c4: No response from camera!" - only driver restart solve the problem.

To Reproduce

1. Run driver: indi_qhy_ccd
2. Change camera 'read mode' from 0 to 1/2 or 3
3. Try to get a frame

Expected behavior
Only one information which I got is: "QHY CCD QHY600M-a7ca3c4: No response from camera!" and red marker beside camera expose in INDI panel.

Desktop (please complete the following information):

• OS: Gentoo Linux (kernel: 5.8.0)
• Version: Local INDI Library: 1.8.6, Code 1.8.6-tgz. Protocol 1.7. (GIT-version from 2020/07/08)

Log Files
"QHY CCD QHY600M-a7ca3c4: No response from camera!"

[JBielanski]

I found bug in "qhy_ccd.cpp", my solution is described on QHYCCD Forum - 'QHY600M - Read Modes switch does not working'

[knro]

That's awesome!! Can you please submit a PR for the fix?

[JBielanski]

That's awesome!! Can you please submit a PR for the fix?
I attached the archive with modified file. I don't know if my solution is the best but for my purposes it is working. Unfortunately still does not working correctly camera mode. I have to get to know better QHY API because inside the QHY library for Linux are more bugs. This code should be test with other QHYCCD cameras, because I don't know how it behave with others.

indi-3rdparty-1.8.6.zip

[knro]

Ok, hopefully you can get a confirmation from QHY on what's going on exactly.

[JBielanski]

I have checked new code from GIT with new QHYSDK v20.8.26, they have still bug with Read Modes switching. Finally I create a patch, this patch could by applied by command: patch < qhy_ccd.patch indi-3rdparty/indi-qhy/qhy_ccd.cpp.
qhy_ccd.patch.zip

[knro]

Thank you, patch applied. Please test and re-open if necessary.