在Android上获取Freestyle Libre Data认为OTG电缆

问题描述

我正在尝试通过OTG获取Freestyle Libre-方丈（血糖仪）的数据。

此设备是HID设备。它有2个接口：

{"interfaceNumber":0,"direction":"in","maximumPacketSize":64,"pollingInterval":1,"type":"interrupt"}
{"interfaceNumber":1,"type":"interrupt"}

您可以将这两个接口的方向设置为“输入”，每个接口的端点为“中断”（ UsbConstants.USB_ENDPOINT_XFER_INT ）

我试图改写“ Missile Launcher”的代码

下面是我的代码：

公共类MainActivity扩展了Activity {

private static final String TAG = "MainActivity";

private UsbManager mUsbManager;
private UsbDevice mDevice;
private UsbDeviceConnection mConnection;
private UsbEndpoint mReadEndpoint;
private UsbEndpoint mWriteEndpoint;


private static final int COMMAND_STATUS = 0x04;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    mUsbManager = (UsbManager)getSystemService(Context.USB_SERVICE);
}

@Override
public void onPause() {
    super.onPause();
}

@Override
public void onResume() {
    super.onResume();

    Intent intent = getIntent();
    Log.d(TAG,"intent: " + intent);
    String action = intent.getAction();

    UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
    if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
        setDevice(device);
    } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
        if (mDevice != null && mDevice.equals(device)) {
            setDevice(null);
        }
    }
}

@Override
public void onDestroy() {
    super.onDestroy();
}

private void setDevice(UsbDevice device) {
    Log.d(TAG,"setDevice " + device);
    if (device.getInterfaceCount()  <= 0) {
        Log.e(TAG,"Could not find interface" + device.getInterfaceCount());
        return;
    }
    UsbInterface intf = device.getInterface(0);
    // device should have one endpoint
    if (intf.getEndpointCount()  <= 0) {
        Log.e(TAG,"Could not find endpoint");
        return;
    }
    // endpoint should be of type interrupt
    UsbEndpoint ep = intf.getEndpoint(0);
    if (ep.getType() != UsbConstants.USB_ENDPOINT_XFER_INT) {
        Log.e(TAG,"endpoint is not interrupt type");
        return;
    }
    mDevice = device;
    mReadEndpoint = ep;
    if (device != null) {
        UsbDeviceConnection connection = mUsbManager.openDevice(device);
        if (connection != null && connection.claimInterface(intf,true)) {
            Log.d(TAG,"open SUCCESS");
            mConnection = connection;
            Thread thread = new Thread(){ public void run() {
                ByteBuffer buffer = ByteBuffer.allocate(64);
                UsbRequest request = new UsbRequest();
                request.initialize(mConnection,mReadEndpoint);
                byte status = -1;
                while (true) {
                    // queue a request on the interrupt endpoint
                    request.queue(buffer,64);
                    // send poll status command
                    sendCommand(COMMAND_STATUS);
                    // wait for status event
                    if (mConnection.requestWait() == request) {
                      //  Log.d(TAG,"transfer going on");
                      //  Log.d(TAG,"byte s " + new String(buffer.array()));

                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                        }
                    } else {


                        Log.d(TAG,"transfer is finished");
                        break;
                    }
                }
                Log.d(TAG,"buffer size " + buffer.array().length);

                Log.d(TAG," final byte s " + new String(buffer.array()));
            }};
            thread.start();

        } else {
            Log.d(TAG,"open FAIL");
            mConnection = null;
        }
    }
}

private void sendCommand(int control) {
    synchronized (this) {

        if (control != COMMAND_STATUS) {
            Log.d(TAG,"Command " + control);
        }
        if (mConnection != null) {

            byte[] message = new byte[64];
            message[0] = 0x04;
            // message[0] = (byte)control;
            // Send command via a control request on endpoint zero
          int test = mConnection.controlTransfer(0x21,0x9,0x200,message,message.length,0);
            Log.d(TAG,"test control  " + test);
            if (test > 0 ) {
                int testb = mConnection.controlTransfer(0x81,150);
                    if (testb > 0) {
                        for (int i = 0; i< message.length; i++){
                            Log.d("message","i:" + i + " = " + message[i]);
                        }
                    } else {
                        Log.d(TAG,"test bulk  " + testb);

                    }
            } else {
                Log.d(TAG,"test control  " + test);

            }


        }
    }
}

}

我的清单：

<?xml version="1.0" encoding="utf-8"?>

<uses-feature android:name="android.hardware.usb.host" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

        <intent-filter>
            <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
        </intent-filter>

        <Meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
            android:resource="@xml/device_filter" />
    </activity>
</application>

数据传输永远不会结束（传输完成后应该中断循环）。

获取缓冲区的结果：MainActivity: byte s 0��

所以我的问题是：最终能够从该设备读取数据时我缺少什么？我做错了什么？

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）

android android byte java java usb usb usb-otg