// initializes the usb connection to the arduino
// returns the the status to be displayed on the GUI
public static String start(Context context) {
Log.i(TAG, "Starting ArduinoController");
// set up usb manager
if (usbManager == null) usbManager = (UsbManager) context.getSystemService(Context.USB_SERVICE);
// get all available usb drivers
Log.i(TAG, "Listing Drivers");
SystemClock.sleep(1000);
List<UsbSerialDriver> drivers = UsbSerialProber.getDefaultProber().findAllDrivers(usbManager);
if (drivers.isEmpty()) {
Log.i(TAG, "No drivers found!");
return "No drivers found!";
}
// look for a supported usb driver
Log.i(TAG, "Drivers found: " + drivers.toString());
arduinoPort = drivers.get(0).getPorts().get(0); // assume first one is the arduino
if (arduinoPort == null) {
Log.i(TAG, "Did not find arduino device.");
return "Arduino Not Found!";
}
// open the usb device
UsbDevice device = arduinoPort.getDriver().getDevice();
Log.i(TAG, "Connected to productID: " + device.getVendorId());
UsbDeviceConnection connection = usbManager.openDevice(device);
if (connection == null) {
Log.i(TAG, "Could not open device");
return "Opening device failed!";
}
// open usb connection and set parity and baud rate
try {
arduinoPort.open(connection);
// set to send over 8 bits
arduinoPort.setParameters(
9600, UsbSerialPort.DATABITS_8, UsbSerialPort.STOPBITS_1, UsbSerialPort.PARITY_NONE);
} catch (IOException e) {
String result = "Error opening device: " + e.getMessage();
Log.i(TAG, result);
try {
arduinoPort.close();
} catch (IOException e2) {
// Ignore
}
return result;
}
onDeviceStateChange(); // Restart the IO manager
return "Connected to: " + arduinoPort.getClass().getSimpleName();
}
public static void pause() {
if (arduinoPort != null) {
try {
arduinoPort.close();
} catch (IOException e) {
// Ignore.
}
arduinoPort = null;
}
}