• Android Framework
• How to set a GPIO
• How to read from a GPIO
• How to read from a ValueSupplier via the framework
  • How to log a ValueSupplier via the framework
  • License
  • Acknowledgments

Android Framework

This is an open source framework to ease the use of this android system services and ease the logging of the data returned by the services.

How to set a GPIO

int i = 10;
com.grimgal.android.framework.GPIO gpio =
      com.grimgal.android.framework.GPIO.create(i);
{
	gpio.setOut();
}
if (gpio.isOut()) {
	gpio.setValue(false); // Sets the GPIO to logical false
	// Do something in-between
	gpio.setValue(true);  // Sets the GPIO to logical true
}
else {
	// Error handling
}

How to read from a GPIO

int i = 10;
com.grimgal.android.framework.GPIO gpio =
      com.grimgal.android.framework.GPIO.create(i);
{
	gpio.setIn();
}
if (gpio.isIn()) {
	boolean value = gpio.getValue();
	// Do something with the value
}
else {
	// Error handling
}

How to read from a ValueSupplier via the framework

IValueSupplierManager valueSupplierManager =
      IValueSupplierManager.
      Stub.
      asInterface(
      	ServiceManager.
      	getService("VALUE_SUPPLIER_MANAGER")
      );
byte[] bytes = valueSupplierManager.
               value("$SUP_NAME"); // e.g. ODROID_XU3_FAN_USAGE
ByteBuffer wrapped = ByteBuffer.wrap(bytes)
float value = wrapped.getFloat(); // Beware, not all suppliers return a float.
                                  // Some return a double, int, long, char etc.

How to log a ValueSupplier via the framework

String log_directory = "my/log/directory/"; // Beware, write access isn't requestet 
                                            // by the frameworks and needs to be requestet 
                                            // by the app!
String prefix = "my_log_for_suppliert_X";
String supplier = "X";
try {
	com.grimgal.android.framework.Framework.init(log_directory, prefix);
	IValueSupplierManager ivsm = IValueSupplierManager.Stub.asInterface(ServiceManager.getService("VALUE_SUPPLIER_MANAGER"));
	if (ivsm == null) {
		com.grimgal.android.framework.Log.e("supplier","ivsm was null");
	}
	int found_index = -1;
	String[] suppliers = ivsm.list();
	com.grimgal.android.framework.Log.v("AppLauncher","Found " +suppliers.length+" Suppliers");
	for(int k =0 ; k < suppliers.length ; k++) {
		com.grimgal.android.framework.Log.v("supplier",suppliers[k]);
		if (suppliers[k].equals(supplier)) {
			found_index = k;
		}
	}
	if (found_index == -1) {
		// Error handling
	}
	// Log the value supplied by the value suppliert k each 100ms (10Hz)
	com.grimgal.android.framework.ValueLog.run(
		suppliers[found_index],                      // Supplier name
		100,                                         // Period
		java.util.concurrent.TimeUnit.MILLISECONDS   // Unit of the period
	);
}
catch (IOException e) {
	// Error handling
}
catch (RemoteException e2) {
	// Error handling
}
catch (Exception e3) {
	// Error handling
}

License

This project is licensed under Apache 2.0 - see the LICENSE file for details.

Acknowledgments

• TU Dortmund Embedded System Software Group which made this release possible