Orange pi zero 3 enable pwm?

[Marco Cettina]

Hello! PWM seems to work without any configuration on the factory images with the gpio command, but I cant seem to get it to work on armbian.

There doesn't seem to be any dtbs related to pwm, and /sys/class/pwm is empty on armbian. Anyone got this to work?

 

EDIT: Forgot to add, doesnt seem to be any pwm overlays present on armbian install

Edited Friday at 03:35 AM by Marco Cettina

[Werner]

Check if there are pwm overlays available in /boot/dtb/allwinner/overlay. If so try enable via armbian-config or manually with overlays= in /boot/armbianEnv.txt

[Marco Cettina]

Whoops forgot to add that, there are no pwm related overlays on armbian install.

[Werner]

Sometimes armbian-config is unreliable when adding overlays, therefore I suggested to check manually as well.

[Marco Cettina]

The only two dtbs that mention PWM have a different prefix so i assume thats why they dont work when i try to enable them?

sun50i-h5-pwn.dtbo and sun50i-h6-pwn.dtbo

Edited Friday at 05:21 PM by Marco Cettina

[going]

03.04.2025 в 23:58, Marco Cettina сказал:

doesnt seem to be any pwm overlays present

Which pin requires an overlay?
Which core are you using?

[Marco Cettina]

So Im not entirely sure if I need to figure out the overlays or something else. On the factory debian image there are two overlays pwm12 and pwm34, i didnt enable them and it seems to work just fine with the gpio command.
 

I should have been more specific, on armbian there are two pwm overlays but they have the prefix of sun50i-h5 and sun50i-h6, i tried enabling them anyway but didnt make a difference and still no pwmchip showing up in /sys/class/pwm.

It also is giving me "val pwmWrite 0 <= X <= 1024, Or you can set new range by yourself by pwmSetRange(range)" when i set the pwm value even though I already did set a range and ram the same commands that worked perfectly on the factory image.

Im not sure exactly what you mean by core.

Edited 7 hours ago by Marco Cettina

[going]

51 минуту назад, Marco Cettina сказал:

Im not sure exactly what you mean by core.

uname -r command.

 

Two types of PWM can be available. Software and hardware.

The hardware for h616-h618 processors is only available for these pins:

PG19 - pwm1
PH0  - pwm3
PH1  - pwm4
PH2  - pwm2
PH3  - pwm1
PI11 - pwm1
PI12 - pwm2
PI13 - pwm3
PI14 - pwm4

 

Which pin do you want to use PWM for?

[Marco Cettina]

uname -r: 6.6.75-current-sunxi64

I am wired to PH3 right now, that's what i have been testing with and was functional in hardware mode on the factory supplied Debian image.