[orange pi 5 pwm all enable]

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)

[Orange Pi 5B - EMMC not visible in Armbian]

For anyone else here's what worked for me.

1. Download latest armbian image from here
https://www.armbian.com/orangepi-5/
2. Follow the instructions at the youtube video below to install the image to EMMC. Ensure you use the armbian image. This image won't load as mentioned above

3. Burn the same image to sdcard and install sdcard in pi 5b. I used Rufus on Win11 (https://rufus.ie/en/)
4. Boot up. SD card boots as default
5. Edit the armbianEnv.txt file in the /boot folder and replace the line:

fdtfile=rockchip/rk3588s-orangepi-5.dts 
with
fdtfile=rockchip/rk3588s-orangepi-5b.dts
6. reboot
7. NB! unmount the current /boot folder using the following command in terminal

sudo umount /boot

This unmounts the current boot partition stored in the sdcard

8. use terminal to open gparted

sudo gparted

9. Select the EMMC drive from the top right dropdown
10. Right-click on boot partition and mount on /boot. This mounts the boot partition of the emmc drive
11. edit txt file as per 5. above
12. shutdown and remove sdcard
13. reboot

14. using terminal run the command below to setup pi. Bluetooth/Wifi were working perfectly

sudo armbian-config

 15. Still working on GPIO access ..... 😶‍🌫️. If anyone has any tips to get this working through Python please let me know.