/boot/armbianEnv.txt

rebooting

 

pwm all display working fine

Thanks @pshlab, I used your post as a starting point to enable i2c on my OPi5.

orangepi5:~:% cat /boot/armbianEnv.txt
verbosity=1
bootlogo=true
overlay_prefix=rockchip-rk3588-opi5
overlays=i2c1-m2 i2c1-m4 i2c3-m0 i2c5-m3
fdtfile=rockchip/rk3588s-orangepi-5.dtb
rootdev=UUID=09d57252-cd1c-4b66-8d47-7711aba97e59
rootfstype=ext4
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u

 

Has anybody actually managed to make a hardware PWM work programatically on orange pi 5? wiringPi keeps telling me "the pin you choose doesn't support hardware PWM". This with all PWM pins activated.

 

Thanks for your help.

At least the PWM fan works fine with the thermal governor on step_wise. Are you sure that you've the overlay files in the right folder? Or did you also activate other overlays that use the same pin?

Based on page 174 in the usermanual (https://drive.google.com/file/d/1TogN8KUzQKUH1DTtjWBQA1aFVhquG_PJ/view?pli=1)

install the python rpc library

pip install rpyc

log in as root and create the following server.py file

# server.py

# server.py
import rpyc
from rpyc.utils.server import ThreadedServer
from subprocess import  PIPE, run

@rpyc.service
class TestService(rpyc.Service):
    PINS = {2:"pwmchip5"}

    def bash(self, cmdstr:str):
        '''Run shell command

        Args:
            cmdstr (str): shell command string
        '''
        try:
            cmd = run(
                cmdstr, stdout=PIPE, encoding="ascii", shell=True
            )
        except Exception as e:
            print(cmdstr)
            print(e)

    @rpyc.exposed
    def pwm(self, pin: int, period: int, duty_cycle: int) -> str:
        '''Set PWM 

        Args:
            pin (int): wiringpi pin number
            period (int): set period
            duty_cycle (int): set duty cycle

        Returns:
            str: _description_
        '''
        chip = self.PINS[pin]
        c1 = f"echo 0 > /sys/class/pwm/{chip}/export"
        c2 = f"echo {period} > /sys/class/pwm/{chip}/pwm0/period"
        c3 = f"echo {duty_cycle} > /sys/class/pwm/{chip}/pwm0/duty_cycle"
        c4 = f"echo 1 > /sys/class/pwm/{chip}/pwm0/enable"

        for cmdstr in [c1,c2,c3,c4]:
            self.bash(cmdstr)


        return f"Success: {pin=} {period=} {duty_cycle=} {chip=}"
    
    @rpyc.exposed
    def disable(self) -> str:
        self.bash("echo 0 > /sys/class/pwm/{chip}/pwm0/enable")

        return 'Success'
    
print('starting PWM server')
server = ThreadedServer(TestService, port=18811)
server.start()

 

This can be automatically started at boot and as root using crontab

Then use the following snippet as the regular non root user

import rpyc

connection = rpyc.connect("localhost", 18811)
print(connection.root.pwm(2, 20000000, 5000000))

 

This creates a 50Hz where the pwm arguments are (pin, period, duty_cycle)

you may need to add to or edit line 8 in the server code to set up your pwm pins

PINS = {2:"pwmchip5"}

You may need to enable these pins as per page 172 of the doc above (see image below)