Ender-3 V3 SE: config settings to roll our own firmware please

Try this

https://wiki.creality.com/en/ender-series/ender-3-v3-ke/quick-start-guide/firmware-open-source/pcb-pinout-and-wiring-diagram

It’s the KE but it has the same board. You can also look at klipper configs also for pin outs.

The issue is with the auto leveling there is no information on how to get that to work fully with either marlin or klipper