kopia lustrzana https://github.com/mik3y/usb-serial-for-android
159 wiersze
4.8 KiB
Java
159 wiersze
4.8 KiB
Java
/* Copyright 2011-2013 Google Inc.
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* Copyright 2013 mike wakerly <opensource@hoho.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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* Project home page: https://github.com/mik3y/usb-serial-for-android
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*/
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package com.hoho.android.usbserial.driver;
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import android.hardware.usb.UsbDevice;
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import android.hardware.usb.UsbDeviceConnection;
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import java.io.IOException;
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/**
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* A base class shared by several driver implementations.
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*
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* @author mike wakerly (opensource@hoho.com)
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*/
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abstract class CommonUsbSerialPort implements UsbSerialPort {
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public static final int DEFAULT_READ_BUFFER_SIZE = 16 * 1024;
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public static final int DEFAULT_WRITE_BUFFER_SIZE = 16 * 1024;
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protected final UsbDevice mDevice;
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protected final int mPortNumber;
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// non-null when open()
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protected UsbDeviceConnection mConnection = null;
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protected final Object mReadBufferLock = new Object();
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protected final Object mWriteBufferLock = new Object();
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/** Internal read buffer. Guarded by {@link #mReadBufferLock}. */
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protected byte[] mReadBuffer;
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/** Internal write buffer. Guarded by {@link #mWriteBufferLock}. */
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protected byte[] mWriteBuffer;
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public CommonUsbSerialPort(UsbDevice device, int portNumber) {
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mDevice = device;
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mPortNumber = portNumber;
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mReadBuffer = new byte[DEFAULT_READ_BUFFER_SIZE];
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mWriteBuffer = new byte[DEFAULT_WRITE_BUFFER_SIZE];
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}
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@Override
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public String toString() {
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return String.format("<%s device_name=%s device_id=%s port_number=%s>",
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getClass().getSimpleName(), mDevice.getDeviceName(),
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mDevice.getDeviceId(), mPortNumber);
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}
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/**
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* Returns the currently-bound USB device.
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*
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* @return the device
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*/
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public final UsbDevice getDevice() {
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return mDevice;
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}
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@Override
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public int getPortNumber() {
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return mPortNumber;
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}
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/**
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* Sets the size of the internal buffer used to exchange data with the USB
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* stack for read operations. Most users should not need to change this.
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*
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* @param bufferSize the size in bytes
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*/
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public final void setReadBufferSize(int bufferSize) {
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synchronized (mReadBufferLock) {
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if (bufferSize == mReadBuffer.length) {
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return;
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}
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mReadBuffer = new byte[bufferSize];
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}
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}
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/**
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* Sets the size of the internal buffer used to exchange data with the USB
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* stack for write operations. Most users should not need to change this.
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*
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* @param bufferSize the size in bytes
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*/
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public final void setWriteBufferSize(int bufferSize) {
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synchronized (mWriteBufferLock) {
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if (bufferSize == mWriteBuffer.length) {
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return;
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}
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mWriteBuffer = new byte[bufferSize];
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}
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}
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@Override
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public abstract void open(UsbDeviceConnection connection) throws IOException;
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@Override
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public abstract void close() throws IOException;
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@Override
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public abstract int read(final byte[] dest, final int timeoutMillis) throws IOException;
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@Override
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public abstract int write(final byte[] src, final int timeoutMillis) throws IOException;
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@Override
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public abstract void setParameters(
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int baudRate, int dataBits, int stopBits, int parity) throws IOException;
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@Override
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public abstract boolean getCD() throws IOException;
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@Override
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public abstract boolean getCTS() throws IOException;
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@Override
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public abstract boolean getDSR() throws IOException;
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@Override
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public abstract boolean getDTR() throws IOException;
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@Override
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public abstract void setDTR(boolean value) throws IOException;
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@Override
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public abstract boolean getRI() throws IOException;
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@Override
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public abstract boolean getRTS() throws IOException;
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@Override
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public abstract void setRTS(boolean value) throws IOException;
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@Override
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public boolean purgeHwBuffers(boolean flushReadBuffers, boolean flushWriteBuffers) throws IOException {
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return !flushReadBuffers && !flushWriteBuffers;
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}
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}
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