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PX4 / PX4-Autopilot

PX4 Autopilot Software
https://px4.io
BSD 3-Clause "New" or "Revised" License
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8 Channel DShot (rather than 6) #22267

Open kristanhilby opened 10 months ago

kristanhilby commented 10 months ago

Describe problem solved by the proposed feature

I currently have 7 brushless motors that I want to run with DShot. I was able to get 6 of them up and running, but when I go to configure the 7th, it appears AUX channels 7 and 8 only allow PWM and OneShot (see attached image). Does anyone know how to configure to allow for DShot on all 8 AUX channels? Is there a limitation in the flight controller that would keep these additional channels from running DShot (I am using a Pixhawk 6C)? Thanks!

Screenshot 2023-10-27 at 10 03 06

Describe your preferred solution

Allow all 8 AUX channels (rather than 6) to command DShot!

Describe possible alternatives

DShot on MAIN channels.

Additional context

No response

simopanzer89 commented 4 months ago

Hello,

@kristanhilby were you able to find a solution for this? We are exactly in the same situation.

I have been doing some research, and it looks like Ardupilot provides support for Dshot on Pixhawk 6C on all the 8 FMU channels based on their doc: https://ardupilot.org/copter/docs/common-holybro-pixhawk6C.html#pwm-output

@bkueng I found this related PR where you introduced support to Dshot for FMU-v5X: https://github.com/PX4/PX4-Autopilot/pull/13628

Do you think it is feasible to do the same for FMU-v6C? Is there any potential hardware conflict, or is the issue related to software?

Related information on PX4 discuss:

https://discuss.px4.io/t/pixhawk6c-dshot-capability-with-px4/31821 https://discuss.px4.io/t/pixhawk-6x-maximum-dshot-outputs/28123 https://discuss.px4.io/t/esc-telemetry-feedback/15122/8

kristanhilby commented 4 months ago

Hi! Unfortunately not. Thankfully my ESCs allowed for PWM control as well so I just moved to using that + calibrating over using DShot (unfortunately). Best of luck!