Windows 10 Iot Core app crashes if I try to open a

I want to open a PWM pin to my buzzer. But If I try to call the pwmController.OpenPin(6) method, the app crashes with an System.Runtime.InteropServices.SEHException.

I had already double checked the sample sources like the ms-iot-samples. But I cannot see what my problems are.

An idea was that some permissions are missing, but if I try to add for exmaple <iot:Capability Name="lowLevelDevices" />, I cannot longer build the application.

Source

private PwmPin buzzerPin;
private PwmController pwmController;

public RainbowHAT()
{
    // ... do something else
    InitAsync();
}

private async void InitAsync()
{
    Logger.Log(this, "Init");

    // Setup PWM controller.
    if (LightningProvider.IsLightningEnabled)
    {
        LowLevelDevicesController.DefaultProvider = LightningProvider.GetAggregateProvider();
    }

    var pwmControllers = await PwmController.GetControllersAsync(LightningPwmProvider.GetPwmProvider());
    if (pwmControllers == null || pwmControllers.Count < 2)
    {
        throw new OperationCanceledException("Operation canceled due missing GPIO controller");
    }

    pwmController = pwmControllers[1];
    pwmController.SetDesiredFrequency(50);

    // Setup buzzer
    buzzerPin = pwmController.OpenPin(13); <-- CRASH
    buzzerPin.SetActiveDutyCyclePercentage(0.05);
    buzzerPin.Start();
}

I also tried the following tip to reduce the min required Windows version, but this does not help, too.

PWM Controller needs Lightning support. So you need to set the controller driver as Direct Memory Mapped Driver. Here is a sample about PWM on Raspberry Pi.

You also need to modify the code as following:

    private async void InitAsync()
    {
        Logger.Log(this, "Init");

        // Setup PWM controller.
        if (LightningProvider.IsLightningEnabled)
        {
            var pwmControllers = await PwmController.GetControllersAsync(LightningPwmProvider.GetPwmProvider());
            if (pwmControllers == null || pwmControllers.Count < 2)
            {
                throw new OperationCanceledException("Operation canceled due missing GPIO controller");
            }

            pwmController = pwmControllers[1];
            pwmController.SetDesiredFrequency(50);

            // Setup buzzer
            buzzerPin = pwmController.OpenPin(13);
            buzzerPin.SetActiveDutyCyclePercentage(0.05);
            buzzerPin.Start();
        }
    }