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jBiDiB jbidibc USB POM Install the libusb drivers for using the libusb access. Under Windows OS you must install the Zadig driver as described here: https://github.com/libusb/libusb/wiki/Windows. Zadic can be downloaded from: http://zadig.akeo.ie/ In the Zadig UI you must check Options > List all devices and the select the 'USB-EPP /I2C... CH341A' device. Then select the target driver with the spinners (I used libusb-win32 (v1.2.6.0)) and click the 'Install driver' button.

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package org.bidib.jbidibc.usbhid;

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class UsbEndpoint {

    private final int mAddress;

    private final int mAttributes;

    private final int mMaxPacketSize;

    private final int mInterval;

    /**
     * UsbEndpoint should only be instantiated by UsbService implementation
     */
    public UsbEndpoint(int address, int attributes, int maxPacketSize, int interval) {
        mAddress = address;
        mAttributes = attributes;
        mMaxPacketSize = maxPacketSize;
        mInterval = interval;
    }

    /**
     * Returns the endpoint's address field. The address is a bitfield containing both the endpoint number as well as
     * the data direction of the endpoint. the endpoint number and direction can also be accessed via
     * {@link #getEndpointNumber} and {@link #getDirection}.
     *
     * @return the endpoint's address
     */
    public int getAddress() {
        return mAddress;
    }

    /**
     * Extracts the endpoint's endpoint number from its address
     *
     * @return the endpoint's endpoint number
     */
    public int getEndpointNumber() {
        return mAddress & UsbConstants.USB_ENDPOINT_NUMBER_MASK;
    }

    /**
     * Returns the endpoint's direction. Returns {@link UsbConstants#USB_DIR_OUT} if the direction is host to device,
     * and {@link UsbConstants#USB_DIR_IN} if the direction is device to host.
     * 
     * @see UsbConstants#USB_DIR_IN
     * @see UsbConstants#USB_DIR_OUT
     *
     * @return the endpoint's direction
     */
    public int getDirection() {
        return mAddress & UsbConstants.USB_ENDPOINT_DIR_MASK;
    }

    /**
     * Returns the endpoint's attributes field.
     *
     * @return the endpoint's attributes
     */
    public int getAttributes() {
        return mAttributes;
    }

    /**
     * Returns the endpoint's type. Possible results are:
     * 
     * {@link UsbConstants#USB_ENDPOINT_XFER_CONTROL} (endpoint zero)
     * 
{@link UsbConstants#USB_ENDPOINT_XFER_ISOC} (isochronous endpoint)
     * 
{@link UsbConstants#USB_ENDPOINT_XFER_BULK} (bulk endpoint)
     * 
{@link UsbConstants#USB_ENDPOINT_XFER_INT} (interrupt endpoint)
     * 
     *
     * @return the endpoint's type
     */
    public int getType() {
        return mAttributes & UsbConstants.USB_ENDPOINT_XFERTYPE_MASK;
    }

    /**
     * Returns the endpoint's maximum packet size.
     *
     * @return the endpoint's maximum packet size
     */
    public int getMaxPacketSize() {
        return mMaxPacketSize;
    }

    /**
     * Returns the endpoint's interval field.
     *
     * @return the endpoint's interval
     */
    public int getInterval() {
        return mInterval;
    }

    @Override
    public String toString() {
        return "UsbEndpoint[mAddress=" + mAddress + ",mAttributes=" + mAttributes + ",mMaxPacketSize=" + mMaxPacketSize
            + ",mInterval=" + mInterval + "]";
    }
}