无法使用Raspberry Pi 3在Windows IoT上打开UART端口 [英] Unable to open UART port on Windows IoT with Raspberry Pi 3

问题描述

在Raspberry Pi 3上运行的Windows IoT核心版10上用C#打开SerialDevice后，串行端口中的值为空.

I have null in the serial port after I open the SerialDevice in C# on Windows IoT Core 10 running on Raspberry Pi 3.

这是代码:

string aqs = SerialDevice.GetDeviceSelector();
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(aqs);
List<DeviceInformation> list = devices.ToList();
DeviceInformation di = list.First();
serialPort = await SerialDevice.FromIdAsync(di.Id);

serialPort是null.

di.Id等于:Id "\\\\?\\ACPI#BCM2836#0#{86e0d1e0-8089-11d0-9ce4-08003e301f73}" string

list.Count等于1

这是/api/devicemanager/devices GET请求中与UART相关的两条记录:

Here are two records from /api/devicemanager/devices GET request related to UART:

{
  "Class": "Ports",
  "Description": "BCM283x Mini UART Serial Device",
  "ID": "ACPI\\BCM2836\\0",
  "Manufacturer": "Microsoft",
  "ParentID": "ACPI_HAL\\PNP0C08\\0",
  "ProblemCode": 0,
  "StatusCode": 25182218
},
{
  "Class": "System",
  "Description": "ARM PL011 UART Device Driver",
  "ID": "ACPI\\BCM2837\\4",
  "Manufacturer": "Microsoft",
  "ParentID": "ACPI_HAL\\PNP0C08\\0",
  "ProblemCode": 0,
  "StatusCode": 25165834
},

我都试图使Rx和Tx短路并且不使其短路，这是行不通的...

I tried both to short circuit Rx and Tx and to not shortly circuit it, it doesn't works...

更新

如果我分割了给定的ID，则有Invalid data异常.

If I split the given ID, I have Invalid data exception.

string aqs = SerialDevice.GetDeviceSelector();
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(aqs);
List<DeviceInformation> list = devices.ToList();
DeviceInformation di = list.First();

string id = "{86e0d1e0-8089-11d0-9ce4-08003e301f73}";
try { serialPort = await SerialDevice.FromIdAsync(id); } catch(Exception e) { Debug.WriteLine(e.Message); }
id = "\\\\?\\ACPI#BCM2836#0#";
try { serialPort = await SerialDevice.FromIdAsync(id); } catch(Exception e) { Debug.WriteLine(e.Message); }
id = di.Id;
try { serialPort = await SerialDevice.FromIdAsync(id); } catch(Exception e) { Debug.WriteLine(e.Message); }
if (serialPort == null) { Debug.WriteLine("No device"); return; }

输出:

抛出异常:mscorlib.ni.dll中的'System.Exception'. 数据无效. (来自HRESULT的异常:0x8007000D)
数据无效. (来自HRESULT的异常:0x8007000D)
没有设备

Exception thrown: 'System.Exception' in mscorlib.ni.dll
The data is invalid. (Exception from HRESULT: 0x8007000D)
The data is invalid. (Exception from HRESULT: 0x8007000D)
No device

推荐答案

正如 Grim 所说，解决方案在这里: SerialDevice.FromIdAsync()产生一个空串行端口

As Grim said, the solution is here: SerialDevice.FromIdAsync() yields a null serial port

有必要添加:

<DeviceCapability Name="serialcommunication">
  <Device Id="any">
    <Function Type="name:serialPort" />
  </Device>
</DeviceCapability>

在Package.appxmanifest文件的<Capabilities>标记中.

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