Sorry to Bring An old post back to life. I am looking for a pxfmini for my raspberry Pi zero. Apparently Erle has gone out of business. It seems like the topic starter has the diagram info for this Autopilot. Would you be kind enough to share this with me? A colleague of mine makes circuit boards so he could build it for me.
Patching the new kernel for RT could be challenging
Other issue is the PWM RCIN as the DMA is not working properly with latest releases , that is not a problem if you are using a serial type of receiver , but then you are out of available serial for telemetry and GPS
A word of warning if you ever end up using a PCA9685 without an external clock: per page 14 of the datasheet, the bit that turns off the internal clock is a “sticky bit” meaning that the device must be power cycled before it can be be cleared. This led me to think that my changes to the code weren’t working when actually, changing the external_clock Boolean to false didn’t affect the state of the device until I powered it off.