menschel

I have to admit, it does not work yet and I have contacted the manufacturer to ask if there are any specialties with USART3. At least it does seem to...

Not working yet, I was trying to verify correct connections by flashing back to BetaFlight and found out that DFU flashing is broken in Ardupilot.

I have verified, that exactly the same connections to R3, T3, 5V, GND works for Betaflight. And I found a caveat in Kakute F4 V2.4, that basically Boot Button does...

I will revert and create new board file based on https://github.com/betaflight/unified-targets/blob/master/configs/default/HBRO-KAKUTEF4V2.config

I have a working setup on UART3 with CRSF. I had to change the POL property to 0 for the inverter. There is something fishy about the RC update rates...

From what I learned by try&error. The Serial Options on Serial5 / Uart3 are not taken into account. The only thing that changes something is changing the POL() property in...

I just found an electrical issue on the tx cable from FC to ELRS receiver, seems to be a short to ground. Will investigate.

OK, electrical issue solved. On the Happymodel ES900RX, the Ground Plane apparently comes out of the board edge where they broke the pcb into separate receivers and soldering cables vertically...

I have just verified, that BRD_ALT_CONFIG = 0 still works for SBUS with my latest patchset. I tested with a Turnigy Evolution + TGY-iA6C. I don't know why SBUS does...

@Holybro Please add your thoughts on this. Is the inverter for R3 (PB11) via PB15 correct this way? I mean Ardupilot does not use UART for SBUS in general, so...