To control GPIO pins you can also try the indi-asi-power driver.
Latest version uses GPIO 21 for DSLR shutter control but is not yet in the nightly builds. check out indilib.org/forum/ccds-dslrs/8982-issue-....html?start=12#68327
If you want to build from source note that I have moved it to branch asidslr2
it would be fairly simple to convert it to use different pins
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