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   1 /*
   2  * Copyright © 2010 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 /*
  19  * Deal with TeleDongle on a serial port
  20  */
  21
  22 package altosui;
  23
  24 import java.lang.*;
  25 import java.io.*;
  26 import java.util.concurrent.LinkedBlockingQueue;
  27 import java.util.LinkedList;
  28 import java.util.Iterator;
  29 import gnu.io.*;
  30 import altosui.AltosSerialMonitor;
  31
  32 /*
  33  * This class reads from the serial port and places each received
  34  * line in a queue. Dealing with that queue is left up to other
  35  * threads.
  36  */
  37 class AltosSerialReader implements Runnable {
  38         InputStream     serial_in;
  39         LinkedList<LinkedBlockingQueue<String>> monitors;
  40         LinkedBlockingQueue<String> reply_queue;
  41         Thread input_thread;
  42         String line;
  43
  44         public void run () {
  45                 int c;
  46
  47                 try {
  48                         for (;;) {
  49                                 c = serial_in.read();
  50                                 if (Thread.interrupted())
  51                                         break;
  52                                 if (c == -1)
  53                                         continue;
  54                                 if (c == '\r')
  55                                         continue;
  56                                 synchronized(this) {
  57                                         if (c == '\n') {
  58                                                 if (line != "") {
  59                                                         if (line.startsWith("VERSION")) {
  60                                                                 for (int e = 0; e < monitors.size(); e++) {
  61                                                                         LinkedBlockingQueue<String> q = monitors.get(e);
  62                                                                         q.put(line);
  63                                                                 }
  64                                                         } else
  65                                                                 reply_queue.put(line);
  66                                                         line = "";
  67                                                 }
  68                                         } else {
  69                                                 line = line + (char) c;
  70                                         }
  71                                 }
  72                         }
  73                 } catch (IOException e) {
  74                 } catch (InterruptedException e) {
  75                 }
  76         }
  77
  78         public String get_reply() throws InterruptedException {
  79                 return reply_queue.take();
  80         }
  81
  82         public void add_monitor(LinkedBlockingQueue<String> q) {
  83                 monitors.add(q);
  84         }
  85
  86         public void remove_monitor(LinkedBlockingQueue<String> q) {
  87                 monitors.remove(q);
  88         }
  89
  90         public void flush () {
  91                 synchronized(this) {
  92                         if (!"VERSION".startsWith(line) && !line.startsWith("VERSION"))
  93                                 line = "";
  94                         reply_queue.clear();
  95                 }
  96         }
  97
  98         public boolean opened() {
  99                 return serial_in != null;
 100         }
 101
 102         public void close() {
 103                 if (serial_in != null) {
 104                         try {
 105                                 serial_in.close();
 106                         } catch (IOException e) {
 107                         }
 108                         serial_in = null;
 109                 }
 110                 if (input_thread != null) {
 111                         try {
 112                                 input_thread.interrupt();
 113                                 input_thread.join();
 114                         } catch (InterruptedException e) {
 115                         }
 116                         input_thread = null;
 117                 }
 118         }
 119
 120         public void open(File name) throws FileNotFoundException {
 121                 close();
 122                 serial_in = new FileInputStream(name);
 123                 input_thread = new Thread(this);
 124                 input_thread.start();
 125         }
 126         public void open(CommPort c) throws IOException {
 127                 close();
 128                 try {
 129                 c.enableReceiveTimeout(1000);   /* icky. the read method cannot be interrupted */
 130                 } catch (UnsupportedCommOperationException ee) {
 131                 }
 132                 serial_in = c.getInputStream();
 133                 input_thread = new Thread(this);
 134                 input_thread.start();
 135         }
 136         public AltosSerialReader () {
 137                 serial_in = null;
 138                 input_thread = null;
 139                 line = "";
 140                 monitors = new LinkedList<LinkedBlockingQueue<String>> ();
 141                 reply_queue = new LinkedBlockingQueue<String> ();
 142         }
 143
 144 }
 145
 146 public class AltosSerial {
 147         OutputStream serial_out = null;
 148         AltosSerialReader reader = null;
 149
 150         CommPort comm_port = null;
 151
 152         public void close() {
 153                 try {
 154                         serial_out.close();
 155                 } catch (IOException ee) {
 156                 }
 157                 reader.close();
 158                 if (comm_port != null) {
 159                         comm_port.close();
 160                 }
 161         }
 162
 163         public void open(File serial_name) throws FileNotFoundException {
 164                 reader.open(serial_name);
 165                 serial_out = new FileOutputStream(serial_name);
 166         }
 167
 168         public void open(CommPort c) throws IOException {
 169                 reader.open(c);
 170                 serial_out = c.getOutputStream();
 171         }
 172
 173         public void connect(String port_name) throws IOException, NoSuchPortException, PortInUseException {
 174                 comm_port = new RXTXPort(port_name);
 175                 open(comm_port);
 176         }
 177
 178         void init() {
 179                 reader = new AltosSerialReader();
 180         }
 181
 182         public void add_monitor(LinkedBlockingQueue<String> q) {
 183                 reader.add_monitor(q);
 184         }
 185
 186         public void remove_monitor(LinkedBlockingQueue<String> q) {
 187                 reader.remove_monitor(q);
 188         }
 189
 190         public AltosSerial() {
 191                 init();
 192         }
 193
 194         public AltosSerial(File serial_name) throws FileNotFoundException {
 195                 init();
 196                 open(serial_name);
 197         }
 198
 199         public AltosSerial(CommPort comm_port) throws IOException {
 200                 init();
 201                 open(comm_port);
 202         }
 203 }