u/EasyInstruction760

So I was struggling with the FlyingRC F4Wing Mini MK1, of which not much documentation is to be found (May 2026).

I was trying to communicate with the HappyModel EP2 TCXO, which for the life of me would not work...

SOLUTION:

- The RCin port (which reads the CRSF signals from the RX) needs to be configured on SERIAL1 in Ardupilot.

- SERIAL1_BAUD should be on 460 (460800 Baud)

- SERIAL1_PROTOCOL should be on 23 (RCIN)

I was set on the wrong foot by "common" F405 controller documentation, stating SERIAL4 was to be used for RCIN, but no, it should be SERIAL1

Hope this helps anyone.