APA102/APA102C has disappeared....the SK9822 is not an exact clone of the APA102. It adds some interesting features. For example the programmable current source to control global brightness and a non-staggered update. But there are also some drawbacks like the protocol incompatibility and the lower PWM frequency...
Obviously APA107 is best choice with higher PWM and lowest price.
you might find some clues by researching either the hologram dash or the hologram nova. the dash was in development about the time of the onion gps module and the nova is the newest gps module which is similar usb module. there are several guides on net explaining how to setup nova on rpi which might help setup onion gps on rpi.
Thanks for your explanation! In the table of Pins that needs to be floating, GPIO7 anf GPIO8 are mentioned, although those pins are not marked as GPIO pins in the pinout diagram. Is this just a phrasing error, or are the wrong numbers stated?
Also about the floating input pins during boot mode, and please excuse my me for still being early at the learning curve, this only applies to input pins right? How do I set these pins as output pre, or during, the boot sequence?
A more specific question for my specific case, and don't hesitate to ask me to move this to a separate question if you think I should: If I connect an (intended) output pin to a NPN transistor gate over some 1k resistance, and connects the emitter to ground, is the pin considered floating or not? Can I hard wire this setup to GPIO1 and still boot up the omega?