Win IoT Core 上的 UWP错误：Pin ' 当前以不兼容的共享模式打开当使用 Dispose

问题描述

我已经实现了一个 UWP 接口。在其中创建了几个页面。在其中一个页面上，我配置了 GPIO 和 SPI。如果多次快速打开此页面，我就会出现问题。

我收到此错误：

The process cannot access the file because it is being used by another process.
Pin ' is currently opened in an incompatible sharing mode. Make sure this pin is not already in use by this application or another application.'

如果我慢慢来，就不会发生这个错误。

在编写代码时，我参考了示例：Windows Iot Core Sample GPIO

我的代码：

public FileManagerPage()
{
    this.InitializeComponent();
    spiConfig();
}

private SpiDevice STM32F103C6T6 = null;
GpioController gpioController = null;
GpioPin gpioPinSTM = null; 
const int GPIO_PIN25 = 25; 

void StopScenario()
{
    if (STM32F103C6T6 != null)
    {
        STM32F103C6T6.Dispose();
        STM32F103C6T6 = null;
    }
    if (gpioPinSTM != null)
    {
        gpioPinSTM.ValueChanged -= Gpio_ValueChanged;
        gpioPinSTM.Dispose();
        gpioPinSTM = null;
    }
}

protected override void OnNavigatedFrom(NavigationEventArgs e)
{
    StopScenario();
}

private void GPIOConfig()
{
    gpioController = GpioController.GetDefault();
    if (gpioController == null)
    {
        return;
    }
    gpioPinSTM = gpioController.OpenPin(GPIO_PIN25); //ERROR: Pin ' is currently opened in an incompatible sharing mode.
    gpioPinSTM.SetDriveMode(GpioPinDriveMode.Input);
    gpioPinSTM.ValueChanged += Gpio_ValueChanged;
}

private async void spiConfig() 
{
    SpiConnectionSettings spiSettings = null;
    SpiController spiController = null;

    String spiDeviceSelector = SpiDevice.GetDeviceSelector();
    IReadOnlyList<DeviceInformation> devices = await DeviceInformation.FindAllAsync(spiDeviceSelector);
    spiController = await SpiController.GetDefaultAsync();
    if (spiController == null)
    {
        return;
    }
    spiSettings = new SpiConnectionSettings(0);
    spiSettings.ClockFrequency = 5000000;
    spiSettings.DataBitLength = 8; 
    spiSettings.Mode = SpiMode.Mode1; 
    STM32F103C6T6 = await SpiDevice.FromIdAsync(devices[0].Id,spiSettings); 
    GPIOConfig();
}

private void Gpio_ValueChanged(GpioPin sender,GpioPinValueChangedEventArgs args)
{
    if (args.Edge == GpioPinEdge.RisingEdge)
    {
        System.Diagnostics.Debug.WriteLine($"got");
    }
}

我无法理解为什么在使用“protected override void OnNavigatedFrom(NavigationEventArgs e)”方法时会出现这个错误，该方法在页面关闭时启动，它实现了“void StopScenario()”方法，它释放GPIO 和 SPI 资源。

任何想法如何解决这个问题？

解决方法

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