kopia lustrzana https://github.com/mik3y/usb-serial-for-android
582 wiersze
20 KiB
Java
582 wiersze
20 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.UsbConstants;
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import android.hardware.usb.UsbDevice;
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import android.hardware.usb.UsbDeviceConnection;
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import android.hardware.usb.UsbEndpoint;
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import android.hardware.usb.UsbRequest;
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import android.util.Log;
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import com.hoho.android.usbserial.util.HexDump;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.util.Collections;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* A {@link CommonUsbSerialPort} implementation for a variety of FTDI devices
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* <p>
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* This driver is based on <a
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* href="http://www.intra2net.com/en/developer/libftdi">libftdi</a>, and is
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* copyright and subject to the following terms:
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*
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* <pre>
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* Copyright (C) 2003 by Intra2net AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License
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* version 2.1 as published by the Free Software Foundation;
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*
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* opensource@intra2net.com
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* http://www.intra2net.com/en/developer/libftdi
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* </pre>
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*
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* </p>
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* <p>
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* Some FTDI devices have not been tested; see later listing of supported and
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* unsupported devices. Devices listed as "supported" support the following
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* features:
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* <ul>
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* <li>Read and write of serial data (see
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* {@link CommonUsbSerialPort#read(byte[], int)} and
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* {@link CommonUsbSerialPort#write(byte[], int)}.</li>
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* <li>Setting serial line parameters (see
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* {@link CommonUsbSerialPort#setParameters(int, int, int, int)}.</li>
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* </ul>
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* </p>
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* <p>
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* Supported and tested devices:
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* <ul>
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* <li>{@value DeviceType#TYPE_R}</li>
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* </ul>
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* </p>
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* <p>
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* Unsupported but possibly working devices (please contact the author with
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* feedback or patches):
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* <ul>
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* <li>{@value DeviceType#TYPE_2232C}</li>
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* <li>{@value DeviceType#TYPE_2232H}</li>
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* <li>{@value DeviceType#TYPE_4232H}</li>
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* <li>{@value DeviceType#TYPE_AM}</li>
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* <li>{@value DeviceType#TYPE_BM}</li>
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* </ul>
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* </p>
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*
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* @author mike wakerly (opensource@hoho.com)
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* @see <a href="https://github.com/mik3y/usb-serial-for-android">USB Serial
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* for Android project page</a>
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* @see <a href="http://www.ftdichip.com/">FTDI Homepage</a>
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* @see <a href="http://www.intra2net.com/en/developer/libftdi">libftdi</a>
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*/
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public class FtdiSerialDriver implements UsbSerialDriver {
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private final UsbDevice mDevice;
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private final UsbSerialPort mPort;
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/**
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* FTDI chip types.
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*/
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private static enum DeviceType {
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TYPE_BM, TYPE_AM, TYPE_2232C, TYPE_R, TYPE_2232H, TYPE_4232H;
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}
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public FtdiSerialDriver(UsbDevice device) {
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mDevice = device;
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mPort = new FtdiSerialPort(mDevice, 0);
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}
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@Override
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public UsbDevice getDevice() {
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return mDevice;
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}
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@Override
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public List<UsbSerialPort> getPorts() {
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return Collections.singletonList(mPort);
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}
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private class FtdiSerialPort extends CommonUsbSerialPort {
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public static final int USB_TYPE_STANDARD = 0x00 << 5;
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public static final int USB_TYPE_CLASS = 0x00 << 5;
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public static final int USB_TYPE_VENDOR = 0x00 << 5;
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public static final int USB_TYPE_RESERVED = 0x00 << 5;
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public static final int USB_RECIP_DEVICE = 0x00;
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public static final int USB_RECIP_INTERFACE = 0x01;
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public static final int USB_RECIP_ENDPOINT = 0x02;
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public static final int USB_RECIP_OTHER = 0x03;
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public static final int USB_ENDPOINT_IN = 0x80;
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public static final int USB_ENDPOINT_OUT = 0x00;
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public static final int USB_WRITE_TIMEOUT_MILLIS = 5000;
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public static final int USB_READ_TIMEOUT_MILLIS = 5000;
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// From ftdi.h
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/**
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* Reset the port.
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*/
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private static final int SIO_RESET_REQUEST = 0;
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/**
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* Set the modem control register.
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*/
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private static final int SIO_MODEM_CTRL_REQUEST = 1;
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/**
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* Set flow control register.
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*/
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private static final int SIO_SET_FLOW_CTRL_REQUEST = 2;
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/**
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* Set baud rate.
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*/
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private static final int SIO_SET_BAUD_RATE_REQUEST = 3;
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/**
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* Set the data characteristics of the port.
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*/
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private static final int SIO_SET_DATA_REQUEST = 4;
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private static final int SIO_RESET_SIO = 0;
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private static final int SIO_RESET_PURGE_RX = 1;
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private static final int SIO_RESET_PURGE_TX = 2;
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public static final int FTDI_DEVICE_OUT_REQTYPE =
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UsbConstants.USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT;
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public static final int FTDI_DEVICE_IN_REQTYPE =
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UsbConstants.USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN;
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/**
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* Length of the modem status header, transmitted with every read.
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*/
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private static final int MODEM_STATUS_HEADER_LENGTH = 2;
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private final String TAG = FtdiSerialDriver.class.getSimpleName();
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private DeviceType mType;
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private int mInterface = 0; /* INTERFACE_ANY */
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private int mMaxPacketSize = 64; // TODO(mikey): detect
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/**
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* Due to http://b.android.com/28023 , we cannot use UsbRequest async reads
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* since it gives no indication of number of bytes read. Set this to
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* {@code true} on platforms where it is fixed.
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*/
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private static final boolean ENABLE_ASYNC_READS = false;
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public FtdiSerialPort(UsbDevice device, int portNumber) {
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super(device, portNumber);
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}
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@Override
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public UsbSerialDriver getDriver() {
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return FtdiSerialDriver.this;
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}
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/**
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* Filter FTDI status bytes from buffer
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* @param src The source buffer (which contains status bytes)
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* @param dest The destination buffer to write the status bytes into (can be src)
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* @param totalBytesRead Number of bytes read to src
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* @param maxPacketSize The USB endpoint max packet size
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* @return The number of payload bytes
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*/
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private final int filterStatusBytes(byte[] src, byte[] dest, int totalBytesRead, int maxPacketSize) {
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final int packetsCount = totalBytesRead / maxPacketSize + 1;
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for (int packetIdx = 0; packetIdx < packetsCount; ++packetIdx) {
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final int count = (packetIdx == (packetsCount - 1))
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? (totalBytesRead % maxPacketSize) - MODEM_STATUS_HEADER_LENGTH
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: maxPacketSize - MODEM_STATUS_HEADER_LENGTH;
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if (count > 0) {
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System.arraycopy(src,
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packetIdx * maxPacketSize + MODEM_STATUS_HEADER_LENGTH,
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dest,
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packetIdx * (maxPacketSize - MODEM_STATUS_HEADER_LENGTH),
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count);
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}
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}
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return totalBytesRead - (packetsCount * 2);
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}
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public void reset() throws IOException {
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int result = mConnection.controlTransfer(FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
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SIO_RESET_SIO, 0 /* index */, null, 0, USB_WRITE_TIMEOUT_MILLIS);
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if (result != 0) {
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throw new IOException("Reset failed: result=" + result);
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}
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// TODO(mikey): autodetect.
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mType = DeviceType.TYPE_R;
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}
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@Override
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public void open(UsbDeviceConnection connection) throws IOException {
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if (mConnection != null) {
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throw new IOException("Already open");
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}
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mConnection = connection;
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boolean opened = false;
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try {
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for (int i = 0; i < mDevice.getInterfaceCount(); i++) {
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if (connection.claimInterface(mDevice.getInterface(i), true)) {
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Log.d(TAG, "claimInterface " + i + " SUCCESS");
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} else {
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throw new IOException("Error claiming interface " + i);
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}
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}
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reset();
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opened = true;
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} finally {
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if (!opened) {
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close();
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mConnection = null;
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}
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}
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}
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@Override
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public void close() throws IOException {
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if (mConnection == null) {
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throw new IOException("Already closed");
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}
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try {
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mConnection.close();
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} finally {
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mConnection = null;
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}
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}
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@Override
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public int read(byte[] dest, int timeoutMillis) throws IOException {
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final UsbEndpoint endpoint = mDevice.getInterface(0).getEndpoint(0);
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if (ENABLE_ASYNC_READS) {
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final int readAmt;
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synchronized (mReadBufferLock) {
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// mReadBuffer is only used for maximum read size.
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readAmt = Math.min(dest.length, mReadBuffer.length);
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}
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final UsbRequest request = new UsbRequest();
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request.initialize(mConnection, endpoint);
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final ByteBuffer buf = ByteBuffer.wrap(dest);
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if (!request.queue(buf, readAmt)) {
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throw new IOException("Error queueing request.");
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}
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final UsbRequest response = mConnection.requestWait();
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if (response == null) {
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throw new IOException("Null response");
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}
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final int payloadBytesRead = buf.position() - MODEM_STATUS_HEADER_LENGTH;
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if (payloadBytesRead > 0) {
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Log.d(TAG, HexDump.dumpHexString(dest, 0, Math.min(32, dest.length)));
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return payloadBytesRead;
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} else {
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return 0;
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}
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} else {
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final int totalBytesRead;
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synchronized (mReadBufferLock) {
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final int readAmt = Math.min(dest.length, mReadBuffer.length);
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totalBytesRead = mConnection.bulkTransfer(endpoint, mReadBuffer,
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readAmt, timeoutMillis);
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if (totalBytesRead < MODEM_STATUS_HEADER_LENGTH) {
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throw new IOException("Expected at least " + MODEM_STATUS_HEADER_LENGTH + " bytes");
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}
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return filterStatusBytes(mReadBuffer, dest, totalBytesRead, endpoint.getMaxPacketSize());
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}
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}
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}
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@Override
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public int write(byte[] src, int timeoutMillis) throws IOException {
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final UsbEndpoint endpoint = mDevice.getInterface(0).getEndpoint(1);
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int offset = 0;
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while (offset < src.length) {
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final int writeLength;
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final int amtWritten;
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synchronized (mWriteBufferLock) {
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final byte[] writeBuffer;
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writeLength = Math.min(src.length - offset, mWriteBuffer.length);
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if (offset == 0) {
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writeBuffer = src;
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} else {
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// bulkTransfer does not support offsets, make a copy.
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System.arraycopy(src, offset, mWriteBuffer, 0, writeLength);
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writeBuffer = mWriteBuffer;
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}
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amtWritten = mConnection.bulkTransfer(endpoint, writeBuffer, writeLength,
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timeoutMillis);
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}
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if (amtWritten <= 0) {
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throw new IOException("Error writing " + writeLength
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+ " bytes at offset " + offset + " length=" + src.length);
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}
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Log.d(TAG, "Wrote amtWritten=" + amtWritten + " attempted=" + writeLength);
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offset += amtWritten;
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}
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return offset;
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}
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private int setBaudRate(int baudRate) throws IOException {
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long[] vals = convertBaudrate(baudRate);
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long actualBaudrate = vals[0];
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long index = vals[1];
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long value = vals[2];
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int result = mConnection.controlTransfer(FTDI_DEVICE_OUT_REQTYPE,
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SIO_SET_BAUD_RATE_REQUEST, (int) value, (int) index,
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null, 0, USB_WRITE_TIMEOUT_MILLIS);
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if (result != 0) {
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throw new IOException("Setting baudrate failed: result=" + result);
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}
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return (int) actualBaudrate;
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}
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@Override
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public void setParameters(int baudRate, int dataBits, int stopBits, int parity)
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throws IOException {
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setBaudRate(baudRate);
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int config = dataBits;
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switch (parity) {
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case PARITY_NONE:
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config |= (0x00 << 8);
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break;
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case PARITY_ODD:
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config |= (0x01 << 8);
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break;
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case PARITY_EVEN:
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config |= (0x02 << 8);
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break;
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case PARITY_MARK:
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config |= (0x03 << 8);
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break;
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case PARITY_SPACE:
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config |= (0x04 << 8);
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break;
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default:
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throw new IllegalArgumentException("Unknown parity value: " + parity);
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}
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switch (stopBits) {
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case STOPBITS_1:
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config |= (0x00 << 11);
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break;
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case STOPBITS_1_5:
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config |= (0x01 << 11);
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break;
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case STOPBITS_2:
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config |= (0x02 << 11);
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break;
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default:
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throw new IllegalArgumentException("Unknown stopBits value: " + stopBits);
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}
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int result = mConnection.controlTransfer(FTDI_DEVICE_OUT_REQTYPE,
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SIO_SET_DATA_REQUEST, config, 0 /* index */,
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null, 0, USB_WRITE_TIMEOUT_MILLIS);
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if (result != 0) {
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throw new IOException("Setting parameters failed: result=" + result);
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}
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}
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private long[] convertBaudrate(int baudrate) {
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// TODO(mikey): Braindead transcription of libfti method. Clean up,
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// using more idiomatic Java where possible.
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int divisor = 24000000 / baudrate;
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int bestDivisor = 0;
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int bestBaud = 0;
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int bestBaudDiff = 0;
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int fracCode[] = {
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0, 3, 2, 4, 1, 5, 6, 7
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};
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for (int i = 0; i < 2; i++) {
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int tryDivisor = divisor + i;
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int baudEstimate;
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int baudDiff;
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if (tryDivisor <= 8) {
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// Round up to minimum supported divisor
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tryDivisor = 8;
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} else if (mType != DeviceType.TYPE_AM && tryDivisor < 12) {
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// BM doesn't support divisors 9 through 11 inclusive
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tryDivisor = 12;
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} else if (divisor < 16) {
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// AM doesn't support divisors 9 through 15 inclusive
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tryDivisor = 16;
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} else {
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if (mType == DeviceType.TYPE_AM) {
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// TODO
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} else {
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if (tryDivisor > 0x1FFFF) {
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// Round down to maximum supported divisor value (for
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// BM)
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tryDivisor = 0x1FFFF;
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}
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}
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}
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// Get estimated baud rate (to nearest integer)
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baudEstimate = (24000000 + (tryDivisor / 2)) / tryDivisor;
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// Get absolute difference from requested baud rate
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if (baudEstimate < baudrate) {
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baudDiff = baudrate - baudEstimate;
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} else {
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baudDiff = baudEstimate - baudrate;
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}
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if (i == 0 || baudDiff < bestBaudDiff) {
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// Closest to requested baud rate so far
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bestDivisor = tryDivisor;
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bestBaud = baudEstimate;
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bestBaudDiff = baudDiff;
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if (baudDiff == 0) {
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// Spot on! No point trying
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break;
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}
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}
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}
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// Encode the best divisor value
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long encodedDivisor = (bestDivisor >> 3) | (fracCode[bestDivisor & 7] << 14);
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// Deal with special cases for encoded value
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if (encodedDivisor == 1) {
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encodedDivisor = 0; // 3000000 baud
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} else if (encodedDivisor == 0x4001) {
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encodedDivisor = 1; // 2000000 baud (BM only)
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}
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// Split into "value" and "index" values
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long value = encodedDivisor & 0xFFFF;
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long index;
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if (mType == DeviceType.TYPE_2232C || mType == DeviceType.TYPE_2232H
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|| mType == DeviceType.TYPE_4232H) {
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index = (encodedDivisor >> 8) & 0xffff;
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index &= 0xFF00;
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index |= 0 /* TODO mIndex */;
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} else {
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index = (encodedDivisor >> 16) & 0xffff;
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}
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// Return the nearest baud rate
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return new long[] {
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bestBaud, index, value
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};
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}
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@Override
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public boolean getCD() throws IOException {
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return false;
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}
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@Override
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public boolean getCTS() throws IOException {
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return false;
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}
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@Override
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public boolean getDSR() throws IOException {
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return false;
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}
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@Override
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public boolean getDTR() throws IOException {
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return false;
|
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}
|
|
|
|
@Override
|
|
public void setDTR(boolean value) throws IOException {
|
|
}
|
|
|
|
@Override
|
|
public boolean getRI() throws IOException {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean getRTS() throws IOException {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public void setRTS(boolean value) throws IOException {
|
|
}
|
|
|
|
@Override
|
|
public boolean purgeHwBuffers(boolean purgeReadBuffers, boolean purgeWriteBuffers) throws IOException {
|
|
if (purgeReadBuffers) {
|
|
int result = mConnection.controlTransfer(FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
|
|
SIO_RESET_PURGE_RX, 0 /* index */, null, 0, USB_WRITE_TIMEOUT_MILLIS);
|
|
if (result != 0) {
|
|
throw new IOException("Flushing RX failed: result=" + result);
|
|
}
|
|
}
|
|
|
|
if (purgeWriteBuffers) {
|
|
int result = mConnection.controlTransfer(FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
|
|
SIO_RESET_PURGE_TX, 0 /* index */, null, 0, USB_WRITE_TIMEOUT_MILLIS);
|
|
if (result != 0) {
|
|
throw new IOException("Flushing RX failed: result=" + result);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public static Map<Integer, int[]> getSupportedDevices() {
|
|
final Map<Integer, int[]> supportedDevices = new LinkedHashMap<Integer, int[]>();
|
|
supportedDevices.put(Integer.valueOf(UsbId.VENDOR_FTDI),
|
|
new int[] {
|
|
UsbId.FTDI_FT232R,
|
|
UsbId.FTDI_FT231X,
|
|
});
|
|
return supportedDevices;
|
|
}
|
|
|
|
}
|