RPI4 PWM can't be used with Windows11

Describe the bug When I execute the Sample code, I get an error message like the following.

Unhandled exception. System.ArgumentException: No PWM device exists for PWM chip at index 0. (Parameter ‘chip’) at System.Device.Pwm.Channels.Windows10PwmChannel…ctor(Int32 chip, Int32 channel, Int32 frequency, Double dutyCycle) at System.Device.Pwm.PwmChannel.CreateWindows10PwmChannel(Int32 chip, Int32 channel, Int32 frequency, Double dutyCyclePercentage) at System.Device.Pwm.PwmChannel.Create(Int32 chip, Int32 channel, Int32 frequency, Double dutyCyclePercentage) at GPIOTry.Program.Main(String[] args) in D:\Chester\Project\RPI4\Windows\GPIOTry\GPIOTry\Program.cs:line 16

I changed the boot/config.txt according to “https://github.com/dotnet/iot/blob/main/Documentation/raspi-pwm.md”, But the same problem still occurs.

// put sample code here
using System;
using System.Device.Gpio;
using System.Device.I2c;
using System.Device.Spi;
using System.Device.Pwm;
using System.Threading;
namespace GPIOTry
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            var gpiocontroller = new GpioController();
            
            PwmChannel pwmcontroller = PwmChannel.Create(0,0,400,0);
            pwmcontroller.Start();
            gpiocontroller.OpenPin(2, PinMode.Output);
            byte bringth = 0;
            try
            {
                while (true)
                {
                    bringth++;
                    if (bringth == 11)
                        bringth = 0;
                    pwmcontroller.DutyCycle=bringth*0.1;
                    gpiocontroller.Write(2, PinValue.High);
                    Console.WriteLine("Duty is " + bringth.ToString());
                    Console.WriteLine("Set GPIO2 High");
                    Thread.Sleep(1000);
                    gpiocontroller.Write(2, PinValue.Low);
                    Console.WriteLine("Set GPIO2 Low");
                    Thread.Sleep(1000);
                }
            }
            finally
            {
                pwmcontroller.Stop();
                gpiocontroller.ClosePin(2);
            }
        }
    }
}

Platform: RPI4B
OS: Windows11
System.Device.Gpio: 1.5.0

[pgrawehr]

I think there’s nothing we can do here, until the low-level drivers are in place.

[pgrawehr]

@raffaeler Pretty complex task to get that installed, but since Windows 11 will (very likely) be officially available for ARM64 (see here: https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewARM64) we should start investigating this setup. Not sure if I find time to do this, but it does sound interesting.