Update common-mount-targeting.rst to describe mapping of mounts

[timtuxworth]

Mapping of MNT mounts to specific physical devices is a bit tricky. This tries to explain it.

[rmackay9]

.. maybe we should just fix the code so that it works like rangefinders..

[timtuxworth]

.. maybe we should just fix the code so that it works like rangefinders..

I'm guessing that's a bigger deal, but also a good idea. Assuming that might take a while I'm thinking it probably makes sense to update the wiki in the meantime.

[timtuxworth]

Are you sure that multiple serial/net gimbals can be used @rmackay9 - looking at the code in find_serial() -> find_protocol_instance() it seems to me that it might not work, i.e.

You might only be able to have 2 gimbals if they are different types - i.e. a serial gimbal + a servo/gremsy/solo... but not two serial type gimbals like the siyi, alexmos, viewpro ...

Do I have it wrong?

[rmackay9]

@timtuxworth,

Ah,, darn. You are right. The line here should be using the instance number instead of "0". The equivalent line is also incorrect in the SToRM32_serial and Viewpro drivers :-(

Thank you very much for finding this. We will fix it! Or you could probably fix if you want. No pressure.

I've created an issue here ArduPilot/ardupilot#27090

[rmackay9]

Hi @timtuxworth,

I've created a flight code PR ArduPilot/ardupilot#27129 that fixes the underlying issue (at least in my light testing) it does. Hopefully we will be able to get this merged and backported to a beta in the near-ish future.