UsbSerial

Usb serial controller for Android. A more complete description

Devices Supported

CP210X devices Default: 9600,8,1,None,flow off

CDC devices Default 115200,8,1,None,flow off

FTDI devices Default: 9600,8,1,None,flow off

PL2303 devices Default 9600,8,1,None,flow off

CH34x devices Default 9600,8,1,None,flow off

How to use it?

Instantiate a new object of the UsbSerialDevice class

UsbDevice device;
UsbDeviceConnection usbConnection;
...
UsbSerialDevice serial = UsbSerialDevice.createUsbSerialDevice(device, usbConnection); 

Open the device and set it up as desired

serial.open();
serial.setBaudRate(115200);
serial.setDataBits(UsbSerialInterface.DATA_BITS_8);
serial.setParity(UsbSerialInterface.PARITY_ODD);

There is no need to be polling if you want to perform a bulk transaction to a IN endpoint. Define a simply callback

private UsbSerialInterface.UsbReadCallback mCallback = new UsbSerialInterface.UsbReadCallback() {

		@Override
		public void onReceivedData(byte[] arg0) 
		{
			// Code here :)
		}
		
};

And pass a reference of it

serial.read(mCallback);

Write something

serial.write("DATA".getBytes()); // Async-like operation now! :)

Close the device:

serial.close();

In Android usb api, when a usb device has been close it must be reopened

UsbDevice device;
...
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
manager.openDevice(UsbDevice device)

TO-DO

• RTS/CTS and DSR/DTR functions needed to raise hardware flow control signals