Maui安卓系统上USB串口通讯

增加usb设备权限设置
参考项目添加配置，库源码，安卓14以上需要注意。

搜索USB串口设备

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Android.App.Activity act = Platform.CurrentActivity;
Android.Hardware.Usb.UsbManager manager = (Android.Hardware.Usb.UsbManager)act.GetSystemService(Android.Content.Context.UsbService);
var table = Hoho.Android.UsbSerial.Driver.UsbSerialProber.DefaultProbeTable;
table.AddProduct(0x1b4f, 0x0008, typeof(Hoho.Android.UsbSerial.Driver.CdcAcmSerialDriver)); // IOIO OTG
table.AddProduct(0x09D8, 0x0420, typeof(Hoho.Android.UsbSerial.Driver.CdcAcmSerialDriver)); // Elatec TWN4

var prober = new Hoho.Android.UsbSerial.Driver.UsbSerialProber(table);
var list = prober.FindAllDrivers(manager);
_UsbDevices.Clear();
foreach (var item in list)
{
    _UsbDevices.Add(item);
}

列出设备串口
选择其中一个串口_UsbSerialPort

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_UsbSerialPorts.Clear();
foreach (var item in _UsbDevice.Ports)
{
    _UsbSerialPorts.Add(item);
}

打开串口

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Android.App.Activity act = Platform.CurrentActivity;
//var portInfo = act.Intent.GetParcelableExtra("PortInfo") as Hoho.Android.UsbSerial.Extensions.UsbSerialPortInfo;
//int vendorId = portInfo.VendorId;
//int deviceId = portInfo.DeviceId;
//int portNumber = portInfo.PortNumber;

Android.Hardware.Usb.UsbManager manager = (Android.Hardware.Usb.UsbManager)act.GetSystemService(Android.Content.Context.UsbService);

//var table = Hoho.Android.UsbSerial.Driver.UsbSerialProber.DefaultProbeTable;
//table.AddProduct(0x1b4f, 0x0008, typeof(Hoho.Android.UsbSerial.Driver.CdcAcmSerialDriver)); // IOIO OTG

//table.AddProduct(0x09D8, 0x0420, typeof(Hoho.Android.UsbSerial.Driver.CdcAcmSerialDriver)); // Elatec TWN4

//var prober = new Hoho.Android.UsbSerial.Driver.UsbSerialProber(table);
//var list = prober.FindAllDrivers(manager);
//var first = list.FirstOrDefault();
//Hoho.Android.UsbSerial.Driver.UsbSerialPort port = first.Ports[0];

//IDictionary<string, Android.Hardware.Usb.UsbDevice> devicesDictionary = manager.DeviceList;

//Android.Hardware.Usb.UsbDevice dvc = devicesDictionary.ElementAt(0).Value;
// 获取程序对串口的访问权限
var permissionGranted = await manager.RequestPermissionAsync(_UsbDevice.Device, act.ApplicationContext);
if (permissionGranted)
{
    if (serialInputOutputManager == null)
    {
        serialInputOutputManager = new Hoho.Android.UsbSerial.Extensions.SerialInputOutputManager(_UsbSerialPort)
        {
            BaudRate = 115200,
            DataBits = 8,
            StopBits = Hoho.Android.UsbSerial.Driver.StopBits.One,
            Parity = Hoho.Android.UsbSerial.Driver.Parity.None,
        };
        serialInputOutputManager.DataReceived += (sender, e) => {

        };

        serialInputOutputManager.ErrorReceived += (sender, e) => {

        };
    }

    try
    {
        if (!serialInputOutputManager.IsOpen)
        {
            serialInputOutputManager.Open(manager);
        }
    }
    catch (Exception ex)
    {
        return;
    }
}

写数据

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try
{
    byte[] sleepdata = new byte[] { 0xf0, 0x04, 0x10, 0xf1 };
    if (serialInputOutputManager.IsOpen)
    {
        _UsbSerialPort.Write(sleepdata, 200);
    }
}
catch (Exception ex)
{
    return;
}

关闭串口

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try
{
    if (serialInputOutputManager.IsOpen)
    {
        serialInputOutputManager.Close();
    }
}
catch (Exception ex)
{
    return;
}