orange pi 5 pwm all enable

[pshlab]

/boot/armbianEnv.txt

rebooting

 

pwm all display working fine

[Biohazard777]

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

 

[Pronobis]

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.

[royk]

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?

[Dara Ó hEidhin]

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)