Android Advent Calender 2012

Activity_onDestroy.java

@Override
protected void onDestroy() {
	super.onDestroy();
	
	if (deviceDetachedReceiver != null) {
		unregisterReceiver(deviceDetachedReceiver);
	}
}

Actvity_onCreate.java

@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	
	deviceDetachedReceiver = new UsbDeviceDetachedReceiver(this);
	
	IntentFilter filter = new IntentFilter();
	filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
	registerReceiver(deviceDetachedReceiver, filter);
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="jp.kshoji.driver.hid"
    android:versionCode="1"
    android:versionName="1.0.0" >

    <uses-feature android:name="android.hardware.usb.host" /> 
    <uses-sdk android:minSdkVersion="12" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".activity.DriverSampleActivity"
            android:label="@string/app_name"
            android:launchMode="singleTask" >
            <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>
</manifest>

DataTransfer_input_thread.java

private class WaiterThread extends Thread {
	private byte[] readBuffer = new byte[64];
	public boolean stopFlag;
	private Handler receiveHandler;

	public WaiterThread(Handler handler) {
		stopFlag = false;
		this.receiveHandler = handler;
	}

	@Override
	public void run() {
		while (true) {
			synchronized (this) {
				if (stopFlag) {
					return;
				}
			}
			if (inputEndpoint == null) {
				continue;
			}
			
			int length = deviceConnection.bulkTransfer(inputEndpoint, readBuffer, readBuffer.length, 0);
			if (length > 0) {
				byte[] read = new byte[length];
				System.arraycopy(readBuffer, 0, read, 0, length);
				
				Message message = new Message();
				message.obj = read;
				receiveHandler.sendMessage(message);
			}
		}
	}
}

DataTransfer_output.java

@Override
public void onDataTransfer(byte[] bytes) {
	final int maxPacketSize = outputEndpoint.getMaxPacketSize();

	for (int i = 0; i < bytes.length; i += maxPacketSize) {
		byte[] writeBuffer = new byte[maxPacketSize];
		int length = (bytes.length - i) < writeBuffer.length ? bytes.length - i : writeBuffer.length;
		System.arraycopy(bytes, i, writeBuffer, 0, length);
		deviceConnection.bulkTransfer(outputEndpoint, writeBuffer, writeBuffer.length, 0);
	}
}

device_filter.xml

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

<resources>
    <!-- Interface class: USB HID -->
    <usb-device class="3" subclass="0" protocol="0" />
</resources>

mbed_main.cpp

#include "mbed.h"
#include "USBHID.h"

// device
USBHID hid;

// read
HID_REPORT recv;
BusOut leds(LED1, LED2, LED3, LED4);

// write
HID_REPORT send;
AnalogIn input(p15);

int main(void) {
    int lastData = 0;
    int currentData;
    
    send.length = 64;
    while (1) {
        // read
        hid.readNB(&recv);
        if (recv.length > 0) {
            leds = recv.data[0];
        }
        
        currentData = input.read_u16();
        if (currentData != lastData) {
            lastData = currentData;

            // write            
            send.data[0] = (currentData >> 8) & 0xff;
            send.data[1] = currentData & 0xff;
            hid.send(&send);
        }
    }
}

UsbDeviceDetachedReceiver.java

public class UsbDeviceDetachedReceiver extends BroadcastReceiver {
	private OnDeviceDetachedListener onDeviceDetachedListener;

	public UsbDeviceDetachedReceiver(OnDeviceDetachedListener onDeviceDetachedListener) {
		this.onDeviceDetachedListener = onDeviceDetachedListener;
	}

	@Override
	public void onReceive(Context context, Intent intent) {
		String action = intent.getAction();
		if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
			UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
			if (device != null) {
				if (onDeviceDetachedListener != null) {
					onDeviceDetachedListener.onDeviceDetached(device);
				}
			}
		}
	}
}