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POUSB Host initialization (controlTransfer) for PIC24 Microcontroller
 

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    <p>I am working on an application that utilizes the <strong>USB Host capabilities of Android to communicate with a micro controller based device (PIC24FJ64GB002)</strong>. The device has Microchip's USB stack on it and has been confirmed to work through testing with windows. I am now trying to establish communication with the device through the Android application. So far I have been able to detect the device (through an intent filter in the manifest file), open device and claim the control interface (interface 0). I know that I need to perform some initialization/setup of the device but I am not sure how to do this. For instance, I know that for the Arduino USB-to-Serial it is...</p> <pre><code>conn.controlTransfer(0x21, 34, 0, 0, null, 0, 0); conn.controlTransfer(0x21, 32, 0, 0, new byte[] { (byte) 0x80, 0x25, 0x00, 0x00, 0x00, 0x00, 0x08 }, 7, 0); </code></pre> <p>and for the FTDI based Arduinos it is...</p> <pre><code>conn.controlTransfer(0x40, 0, 0, 0, null, 0, 0);// reset conn.controlTransfer(0x40, 0, 1, 0, null, 0, 0);// clear Rx conn.controlTransfer(0x40, 0, 2, 0, null, 0, 0);// clear Tx conn.controlTransfer(0x40, 0x03, 0x4138, 0, null, 0, 0); </code></pre> <p>But I do not know how to set up the Microchip USB Stack on the PIC24. The code that I have so far is shown below... Thanks</p> <p><strong>MainActivity.java</strong></p> <pre><code>public class MainActivity extends Activity { private static final int VID = 0x04D8; private static final int PID = 0x000A; public static int temperature; public static int humidity; public static int lpg; public static int alcohol; ListView listView; //USB UsbDevice USBDevice_s; UsbDeviceConnection USBDeviceConnection_s; UsbEndpoint USBEndpoint_s; UsbInterface USBInterface_s; UsbManager USBManager_s; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Model.LoadModel(); listView = (ListView) findViewById(R.id.listView); String[] ids = new String[Model.Items.size()]; for (int i= 0; i &lt; ids.length; i++) { ids[i] = Integer.toString(i+1); } ItemAdapter adapter = new ItemAdapter(this,R.layout.row, ids); listView.setAdapter(adapter); //Begin USB process after layout has been configured... USBManager_s = (UsbManager) getSystemService(Context.USB_SERVICE); HashMap&lt;String, UsbDevice&gt; deviceList = USBManager_s.getDeviceList(); Iterator&lt;UsbDevice&gt; deviceIterator = deviceList.values().iterator(); while(deviceIterator.hasNext()) { USBDevice_s = deviceIterator.next(); } Intent Intent_s = getIntent(); String action = Intent_s.getAction(); USBDevice_s = (UsbDevice) Intent_s.getParcelableExtra(UsbManager.EXTRA_DEVICE); //If device is attached if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) { USBInterface_s = USBDevice_s.getInterface(0); USBEndpoint_s = USBInterface_s.getEndpoint(0); USBDeviceConnection_s = USBManager_s.openDevice(USBDevice_s); USBDeviceConnection_s.claimInterface(USBInterface_s, true); Toast.makeText(this,"Value of device :" +USBDevice_s.getDeviceName(), Toast.LENGTH_LONG).show(); if (USBDeviceConnection_s != null &amp;&amp; USBDeviceConnection_s.claimInterface(USBInterface_s, true)) { Toast.makeText(this,"Device Open, Interface Claimed", Toast.LENGTH_LONG).show(); } if (USBDeviceConnection_s != null) { //Perform setup/initialization..... } } //If device is detached else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) { USBDevice_s = (UsbDevice) Intent_s.getParcelableExtra(UsbManager.EXTRA_DEVICE); if (USBDevice_s != null) { USBDeviceConnection_s = USBManager_s.openDevice(USBDevice_s); USBDeviceConnection_s.releaseInterface(USBInterface_s); USBDeviceConnection_s.close(); Toast.makeText(this,"Device Removed, Interface Released", Toast.LENGTH_LONG).show(); } return; } //Update Layout temperature = 1; humidity = 63; lpg = 5000; alcohol = 500; Model.LoadModel(); ItemAdapter adapter2 = new ItemAdapter(this,R.layout.row, ids); listView.setAdapter(adapter2); adapter.notifyDataSetChanged(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_settings: //Toast.makeText(this, "Exiting", Toast.LENGTH_SHORT) // .show(); //finish(); break; default: break; } return true; } } </code></pre> <p><strong>Manifest File</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.byrdonatwigge.sense" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-feature android:name="android.hardware.usb.host" /&gt; &lt;uses-sdk android:minSdkVersion="12" android:targetSdkVersion="18" /&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name="com.byrdonatwigge.sense.MainActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;intent-filter&gt; &lt;action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" /&gt; &lt;action android:name="android.hardware.usb.action.USB_DEVICE_DETACHED" /&gt; &lt;/intent-filter&gt; &lt;meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device_filter" /&gt; &lt;meta-data android:name="android.hardware.usb.action.USB_DEVICE_DETACHED" android:resource="@xml/device_filter" /&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p><strong>device_filter.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;usb-device vendor-id="1240" product-id="10" /&gt; &lt;/resources&gt; </code></pre>
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