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POAndroid Usb Host Receive Data
 

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    <p>I try to reading data from my evalboard. It is Stellaris EKK-LM4F232 Evalutaion Kit. It has five buttons. I push a button on board and send data to my android device. For example, i push one times, and board send to 1, and second times send to 2.... I receive the first value (it mean 1) from android device when i push the button first time. But when i push the button again, i can't receive any other values like 2 ,3 ,4 ,... . Here is my code for reading. It read continuously when it is start. Can you help me?</p> <pre><code>public void startDataRecieve() { new Thread(new Runnable() { @Override public void run() { UsbEndpoint endpoint = null; for (int i = 0; i &lt; intf.getEndpointCount(); i++) { if (intf.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN) { endpoint = intf.getEndpoint(i); break; } } UsbRequest request = new UsbRequest(); // create an URB boolean initilzed = request.initialize(connection, endpoint); if (!initilzed) { Log.e("USB CONNECTION FAILED", "Request initialization failed for reading"); return; } while (true) { int bufferMaxLength = endpoint.getMaxPacketSize(); ByteBuffer buffer = ByteBuffer.allocate(bufferMaxLength); if (request.queue(buffer, bufferMaxLength) == true) { if (connection.requestWait() == request) { String result = new String(buffer.array()); Log.i("GELEN DATA : ", result); listener.readData(result); } } } } }).start(); } </code></pre> <p>If you can't understand very well the same question is here asked by one <a href="https://stackoverflow.com/questions/14016943/android-bulktransfer-return-1-when-read-data-but-there-is-really-some-data-in-t">Android bulkTransfer return -1 when read data but there is really some data in the buffer</a></p> <p>After the discusstion with @Mike Ortiz I put all my code in here. When I click the buttonSend android device send "START" command to device then reading start. When i send to android device to first value i can get it but after first value i don't get any value from usb device. I am sure the usb device sends the values. </p> <pre><code>public class MainActivity extends Activity implements Runnable { private static final String TAG = "MAIN ACTIVITY TEST "; private Button buttonConnect; private Button butonSend; private Button buttonDisconnect; private TextView textViewResult; private UsbDevice device; private Thread readThread; private UsbManager usbManager; private UsbDeviceConnection connection; private UsbInterface usbInterface; private UsbEndpoint usbEndpointIn; private UsbEndpoint usbEndpointOut; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); PendingIntent mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0); IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION); registerReceiver(usbReceiver, filter); usbManager = (UsbManager) getSystemService(Context.USB_SERVICE); HashMap&lt;String, UsbDevice&gt; deviceList = usbManager.getDeviceList(); Iterator&lt;UsbDevice&gt; deviceIterator = deviceList.values().iterator(); while (deviceIterator.hasNext()) { UsbDevice device = deviceIterator.next(); if (device.getVendorId() == 7358 &amp;&amp; device.getProductId() == 3) { this.device = device; usbManager.requestPermission(device, mPermissionIntent); break; } } butonSend.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { usbInterface = device.getInterface(0); connection = usbManager.openDevice(device); connection.claimInterface(usbInterface, false); for (int i = 0; i &lt; usbInterface.getEndpointCount(); i++) { UsbEndpoint end = usbInterface.getEndpoint(i); if (end.getDirection() == UsbConstants.USB_DIR_IN) { usbEndpointIn = end; } else { usbEndpointOut = end; } } //SEND START COMMAND TO THE USB DEVICE; int result = connection.bulkTransfer(usbEndpointOut, "START".getBytes(), "START".getBytes().length, 1000); Log.e("SEND RESULT", result + ""); //START READING in run method readThread = new Thread(MainActivity.this); readThread.start(); } }); buttonDisconnect.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mRunning = false; //readThread.stop(); connection.releaseInterface(usbInterface); connection.close(); Log.e(TAG, "Connection CLosed."); } }); } private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION"; private final BroadcastReceiver usbReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (ACTION_USB_PERMISSION.equals(action)) { synchronized (this) { UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE); if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { if (device != null) { Toast.makeText(MainActivity.this, "Cihaza izin verildi", Toast.LENGTH_LONG).show(); } } else { Toast.makeText(MainActivity.this, "Cihaza izin verilmedi.", Toast.LENGTH_LONG).show(); Log.d(TAG, "permission denied for device " + device); } } } } }; private boolean mRunning; private void initView() { butonSend = (Button) findViewById(R.id.buttonSend); buttonConnect = (Button) findViewById(R.id.buttonConnect); textViewResult = (TextView) findViewById(R.id.textViewResult); buttonDisconnect = (Button) findViewById(R.id.buttonDisconnect); } @Override public void run() { mRunning = true; //READ VALUE UNTIL DISCONNECT while (mRunning) { byte[] bytes = new byte[usbEndpointIn.getMaxPacketSize()]; int result = connection.bulkTransfer(usbEndpointIn, bytes, bytes.length, 1000); if(result &gt; 0) Log.e("RESULT : " + result, " VALUE : " + new String(bytes)); } Log.d("Thread", "STOPPPED"); } </code></pre> <p>}</p>
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