Partial parameter upload fails

[booo]

Bug report

Issue details

We would like to upload load a sub set of parameters to the plane. E.g. we would like to upload only servo configuration to the plane.

Right now partial parameter upload does not work for us. After partial parameter upload through QGC or mavproxy input from the remote is broken. E.g. none or only one channel works in radio calibration in QGC.

How to reproduce:

• reset all paramters to defaults
• reboot FC
• load partial parameters from file
• reboot
• open radio calibration in QGC

Here the parameters we try to use:

# Onboard parameters for standard searchwing vehicle
#
# Minimal searchwing configuration that can be merged with the upstream
# parameters from ArduPilot
#
# Stack: ArduPilot
# Vehicle: Fixed Wing
# Version: 4.0.3
# Git Revision: 1d77453
#
# Vehicle-Id Component-Id Name Value Type
#
1   1   ARMING_RUDDER   2   2
1   1   ARSPD_TYPE  0   2
1   1   BATT_AMP_OFFSET -0.070000000298023224   9
1   1   BATT_AMP_PERVLT 18.339622497558593750   9
1   1   BRD_SAFETYENABLE    0   2
1   1   BRD_SAFETY_MASK 27  6
1   1   COMPASS_USE 1   2
1   1   COMPASS_USE2    0   2
1   1   COMPASS_USE3    0   2
1   1   INS_GYR_CAL 0   2
1   1   MIXING_GAIN 0.750000000000000000    9
1   1   RC3_REVERSED    1   2
1   1   SERIAL2_BAUD    9   6
1   1   SERIAL2_OPTIONS 0   4
1   1   SERIAL2_PROTOCOL    2   2
1   1   SERIAL4_BAUD    57  6
1   1   SERIAL4_OPTIONS 0   4
1   1   SERIAL4_PROTOCOL    10  2
1   1   SERIAL5_BAUD    921 6
1   1   SERIAL5_OPTIONS 0   4
1   1   SERIAL5_PROTOCOL    2   2
1   1   SERVO1_FUNCTION 4   2
1   1   SERVO1_MAX  2000    4
1   1   SERVO1_MIN  1000    4
1   1   SERVO1_REVERSED 1   2
1   1   SERVO1_TRIM 1570    4
1   1   SERVO2_FUNCTION 79  2
1   1   SERVO2_MAX  2000    4
1   1   SERVO2_MIN  1000    4
1   1   SERVO2_REVERSED 0   2
1   1   SERVO2_TRIM 1550    4
1   1   SERVO3_FUNCTION 70  2
1   1   SERVO3_MAX  2000    4
1   1   SERVO3_MIN  900 4
1   1   SERVO3_REVERSED 0   2
1   1   SERVO3_TRIM 900 4
1   1   SERVO4_FUNCTION 80  2
1   1   SERVO4_MAX  2000    4
1   1   SERVO4_MIN  1000    4
1   1   SERVO4_REVERSED 1   2
1   1   SERVO4_TRIM 1500    4
1   1   SERVO5_FUNCTION 4   2
1   1   SERVO5_MAX  2000    4
1   1   SERVO5_MIN  1000    4
1   1   SERVO5_REVERSED 1   2
1   1   SERVO5_TRIM 1500    4
1   1   SR2_ADSB    0   4
1   1   SR2_EXTRA1  5   4
1   1   SR2_EXTRA2  0   4
1   1   SR2_EXTRA3  1   4
1   1   SR2_EXT_STAT    1   4
1   1   SR2_PARAMS  0   4
1   1   SR2_POSITION    5   4
1   1   SR2_RAW_CTRL    0   4
1   1   SR2_RAW_SENS    0   4
1   1   SR2_RC_CHAN 0   4

Version

Version V4.2.2. of ArduPlane

Platform [ ] All [ ] AntennaTracker [ ] Copter [x] Plane [ ] Rover [ ] Submarine

Hardware type

We use a PixRacer

[IamPete1]

Are your triggering RC failsafe? Can you upload a tlog and/or a disarmed bin log.

[booo]

What do you mean by "Are you triggering RC failsafe"?

The missing input from the RC seems to trigger failsafe.

If I calibrate the radio prior to upload of the parameter sub-set input from the remote seems to work after upload and reboot.

I can upload a tlog tomorrow. What are we looking for exactly?

[booo]

I uploaded some logs here.

In 2022-07-21%2011-44-38-stick-movement-prior-to-parameter-load.tlog you can see RC input. This is a system after a reset, with the serial configuration changed for the ExpressLRS module currently in use.

Immediately after parameter load you can still see input in 2022-07-21%2011-46-22-one-stick-still-moving-after-load.tlog.

After a reboot you see only one channel changing in 2022-07-21%2011-48-47-no-movement-after-reboot.tlog.

How can I debug this further?

[IamPete1]

You have your throttle input reversed and a low value of throttle failsafe, see:

https://ardupilot.org/plane/docs/rc-throw-trim.html#throttle-reversal

[booo]

I added a proper RCMAP_* configuration. With the proper functions assigned to the channels the configuration works now. Thanks for the hint!