1.14 beta - Unable to arm & position mode altitude not holding

[junwoo091400]

This is from the original comment from @MDecarabas: #21358 (comment)

Describe the bug

Manual Mode
Unable to arm because throttle is high when using sbus rc.
-Troubleshooting:
--Tested using telemetry radio with joystick and issue does not occur.
--Tested on 1.13.3 using sbus rc and issue does not occur

Altitude Mode
Only able to arm if throttle is pushed all the way down when using sbus rc. Once armed it will not lower the rpm of the motors
-Troubleshooting:
--Tested using telemetry radio with joystick and behavior does not occur.
--Tested on 1.13.3 using sbus rc and behavior does not occur

Stablized Mode
Same error and troubleshooting as in manual mode

Position Mode
Unable to reduce altitude when in mode. Drone will either keep level if sticks are fully down or rise if sticks are centered.
-Troubleshooting:
--Tested using telemetry radio with joystick and issue does not occur.
--Tested on 1.13.3 using sbus rc and issue does not occur

Attached below are flight logs for the altitude mode and position mode behavior described above. Let me know if I can provide any more clarifying information.

Log Files and Screenshots

Altitude Mode: https://logs.px4.io/plot_app?log=c597875e-feab-40d4-a633-a709a72dbe99
Position Mode: https://logs.px4.io/plot_app?log=aaeae7c4-4171-472f-8c0e-34a35c91d326

Drone (please complete the following information):

• Describe the type of drone.
• Photo of the IMU / autopilot setup if possible.

Additional context

Add any other context about the problem here.

[bresch]

Sounds like a problem with his RC calibration, no?

[MaxBertus]

I have the same issue and the calibration procedure doesn't resolve the problem

[Jaeyoung-Lim]

@junwoo091400 Are you sure virtual joystick is disabled in QGC?

[abarcis]

Check #21576, maybe it resolves the problem. For me, the symptoms were the same when the throttle axis was inverted.

[MaxBertus]

I confirm that it is possible to fly using joystick and 1.14.0 firmware version.
I also tried to keep using radio controller inverting throttle channel (normally I don't use it reverse) and than calibrating with 1.14.0 firmware version: it works

[MaEtUgR]

Thanks for the reports!
I'm pretty sure this problem is fixed with: #21692
Let me double-check in the logs 👀
Sorry that it took so long 😇

[DronecodeBot]

This issue has been mentioned on Discussion Forum for PX4, Pixhawk, QGroundControl, MAVSDK, MAVLink. There might be relevant details there:

https://discuss.px4.io/t/px4-maintainers-call-june-06-2023/32473/1

[MaEtUgR]

The log is really useful 👍
From the log:

RC_MAP_THROTTLE, 2
RC2_REV, -1.0
RC2_MAX, 1932
RC2_TRIM, 1932

It fits exactly the case described in #21575 and fixed in #21682 and soon on 1.14 in #21692