INAV 8.0.0 Peripherals DJI FPV VTX does not work with Receiver SBUS (DJI RC)

[keefo]

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Hi INav Team

I am using caddx vista VTX and DJI goggle and RC v2. I have 2 drones.

1. a FPV with Betaflight (caddx vista air unit)
2. a Fix wing with INav (caddx vista air unit)

The DJI goggle and RC works on my Betaflight FPV. I can connect air unit with Goggle and RC.
In the Betaflight receiver panel I can see all the bars react to my RC control.
This can tell me that my air unit, goggle and RC are not faulty.

For my fix wing, which use Speedybee f405 Wing FC, it flush with INav FIRMWARE 8.0.0 and I am using INav configurator Version 8.0.0 (8.0.0)
This FC has a dedicated Digital VTX plugin-play port (6pins), it has Positive, 2 ground, RX5, TX5, SBUS.
https://www.speedybee.com/speedybee-f405-wing-app-fixed-wing-flight-controller/

After connect them to Inav, I set UART5 Peripherals column to DJI FPV VTX.
Save reboot, at this stage, Goggle works, it can see caddx vista video feed through Goggle.

However, when I go to receiver, it show Receiver Mode as "None" and even if I select SERIAL -> SBUS and click Save and Reboot.

After reboot, the Receiver Mode become "None" again. and my DJI RC unable to control any bar in the Receiver page. The DJI RC light show as green as it does linked to my air unit for sure.

Further more, When I do RC calibration in my Goggle, and it also show that bar react to my gimbal move.

I also checked the continuity of the 6 pin wires, they are all good. So no wiring issue as far as I can tell.

Current Behavior

Steps to Reproduce

Expected behavior

Suggested solution(s)

Additional context

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• FC Board name and vendor:
• INAV version string:

[mmosca]

DJI FPV VTX is used with DJI Goggles V1 and DJI Goggles V2 + the original DJI Air Units or Vistas.

It is not a receiver protocol.

To use DJI remote, set the UART for serial rx and select SBUS as the protocol in the receiver tab.

Check the SpeedyBee Manual to find out what UART is connected to the SBUS pin in the connector.

[keefo]

I got my answer in
#10658