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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.*;
  27 import java.util.*;
  28
  29 import libaltosJNI.*;
  30
  31 /*
  32  * This class reads from the serial port and places each received
  33  * line in a queue. Dealing with that queue is left up to other
  34  * threads.
  35  */
  36
  37 public class AltosSerial implements Runnable {
  38
  39         static List<String> devices_opened = Collections.synchronizedList(new LinkedList<String>());
  40
  41         AltosDevice device;
  42         SWIGTYPE_p_altos_file altos;
  43         LinkedList<LinkedBlockingQueue<AltosLine>> monitors;
  44         LinkedBlockingQueue<AltosLine> reply_queue;
  45         Thread input_thread;
  46         String line;
  47         byte[] line_bytes;
  48         int line_count;
  49         boolean monitor_mode;
  50         static boolean debug;
  51         boolean remote;
  52         LinkedList<String> pending_output = new LinkedList<String>();
  53
  54         static void set_debug(boolean new_debug) {
  55                 debug = new_debug;
  56         }
  57
  58         public void run () {
  59                 int c;
  60
  61                 try {
  62                         for (;;) {
  63                                 c = libaltos.altos_getchar(altos, 0);
  64                                 if (Thread.interrupted())
  65                                         break;
  66                                 if (c == libaltosConstants.LIBALTOS_ERROR) {
  67                                         for (int e = 0; e < monitors.size(); e++) {
  68                                                 LinkedBlockingQueue<AltosLine> q = monitors.get(e);
  69                                                 q.put(new AltosLine());
  70                                         }
  71                                         reply_queue.put (new AltosLine());
  72                                         break;
  73                                 }
  74                                 if (c == libaltosConstants.LIBALTOS_TIMEOUT)
  75                                         continue;
  76                                 if (c == '\r')
  77                                         continue;
  78                                 synchronized(this) {
  79                                         if (c == '\n') {
  80                                                 if (line_count != 0) {
  81                                                         try {
  82                                                                 line = new String(line_bytes, 0, line_count, "UTF-8");
  83                                                         } catch (UnsupportedEncodingException ue) {
  84                                                                 line = "";
  85                                                                 for (int i = 0; i < line_count; i++)
  86                                                                         line = line + line_bytes[i];
  87                                                         }
  88                                                         if (debug)
  89                                                                 System.out.printf("\t\t\t\t\t%s\n", line);
  90                                                         if (line.startsWith("VERSION") || line.startsWith("CRC")) {
  91                                                                 for (int e = 0; e < monitors.size(); e++) {
  92                                                                         LinkedBlockingQueue<AltosLine> q = monitors.get(e);
  93                                                                         q.put(new AltosLine (line));
  94                                                                 }
  95                                                         } else {
  96                                                                 reply_queue.put(new AltosLine (line));
  97                                                         }
  98                                                         line_count = 0;
  99                                                         line = "";
 100                                                 }
 101                                         } else {
 102                                                 if (line_bytes == null) {
 103                                                         line_bytes = new byte[256];
 104                                                 } else if (line_count == line_bytes.length) {
 105                                                         byte[] new_line_bytes = new byte[line_count * 2];
 106                                                         System.arraycopy(line_bytes, 0, new_line_bytes, 0, line_count);
 107                                                         line_bytes = new_line_bytes;
 108                                                 }
 109                                                 line_bytes[line_count] = (byte) c;
 110                                                 line_count++;
 111                                         }
 112                                 }
 113                         }
 114                 } catch (InterruptedException e) {
 115                 }
 116         }
 117
 118         public void flush_output() {
 119                 if (altos != null) {
 120                         for (String s : pending_output)
 121                                 System.out.print(s);
 122                         pending_output.clear();
 123                         libaltos.altos_flush(altos);
 124                 }
 125         }
 126
 127         public void flush_input() {
 128                 flush_output();
 129                 boolean got_some;
 130
 131                 int timeout = 100;
 132                 if (remote)
 133                         timeout = 300;
 134                 do {
 135                         try {
 136                                 Thread.sleep(timeout);
 137                         } catch (InterruptedException ie) {
 138                         }
 139                         got_some = !reply_queue.isEmpty();
 140                         synchronized(this) {
 141                                 if (!"VERSION".startsWith(line) &&
 142                                     !line.startsWith("VERSION"))
 143                                         line = "";
 144                                 reply_queue.clear();
 145                         }
 146                 } while (got_some);
 147         }
 148
 149         public String get_reply() throws InterruptedException {
 150                 flush_output();
 151                 AltosLine line = reply_queue.take();
 152                 return line.line;
 153         }
 154
 155         public String get_reply(int timeout) throws InterruptedException {
 156                 flush_output();
 157                 AltosLine line = reply_queue.poll(timeout, TimeUnit.MILLISECONDS);
 158                 if (line == null)
 159                         return null;
 160                 return line.line;
 161         }
 162
 163         public void add_monitor(LinkedBlockingQueue<AltosLine> q) {
 164                 set_monitor(true);
 165                 monitors.add(q);
 166         }
 167
 168         public void remove_monitor(LinkedBlockingQueue<AltosLine> q) {
 169                 monitors.remove(q);
 170                 if (monitors.isEmpty())
 171                         set_monitor(false);
 172         }
 173
 174         public void close() {
 175                 if (altos != null) {
 176                         libaltos.altos_close(altos);
 177                 }
 178                 if (input_thread != null) {
 179                         try {
 180                                 input_thread.interrupt();
 181                                 input_thread.join();
 182                         } catch (InterruptedException e) {
 183                         }
 184                         input_thread = null;
 185                 }
 186                 if (altos != null) {
 187                         libaltos.altos_free(altos);
 188                         altos = null;
 189                 }
 190                 synchronized (devices_opened) {
 191                         devices_opened.remove(device.getPath());
 192                 }
 193                 if (debug)
 194                         System.out.printf("Closing %s\n", device.getPath());
 195         }
 196
 197         private void putc(char c) {
 198                 if (altos != null)
 199                         libaltos.altos_putchar(altos, c);
 200         }
 201
 202         public void print(String data) {
 203                 if (debug)
 204                         pending_output.add(data);
 205                 for (int i = 0; i < data.length(); i++)
 206                         putc(data.charAt(i));
 207         }
 208
 209         public void printf(String format, Object ... arguments) {
 210                 print(String.format(format, arguments));
 211         }
 212
 213         private void open() throws FileNotFoundException, AltosSerialInUseException {
 214                 synchronized (devices_opened) {
 215                         if (devices_opened.contains(device.getPath()))
 216                                 throw new AltosSerialInUseException(device);
 217                         devices_opened.add(device.getPath());
 218                 }
 219                 altos = libaltos.altos_open(device);
 220                 if (altos == null) {
 221                         close();
 222                         throw new FileNotFoundException(device.toShortString());
 223                 }
 224                 if (debug)
 225                         System.out.printf("Open %s\n", device.getPath());
 226                 input_thread = new Thread(this);
 227                 input_thread.start();
 228                 print("~\nE 0\n");
 229                 set_monitor(false);
 230                 flush_output();
 231         }
 232
 233         public void set_radio() {
 234                 set_channel(AltosPreferences.channel(device.getSerial()));
 235                 set_callsign(AltosPreferences.callsign());
 236         }
 237
 238         public void set_channel(int channel) {
 239                 if (altos != null) {
 240                         if (monitor_mode)
 241                                 printf("m 0\nc r %d\nm 1\n", channel);
 242                         else
 243                                 printf("c r %d\n", channel);
 244                         flush_output();
 245                 }
 246         }
 247
 248         void set_monitor(boolean monitor) {
 249                 monitor_mode = monitor;
 250                 if (altos != null) {
 251                         if (monitor)
 252                                 printf("m 1\n");
 253                         else
 254                                 printf("m 0\n");
 255                         flush_output();
 256                 }
 257         }
 258
 259         public void set_callsign(String callsign) {
 260                 if (altos != null) {
 261                         printf ("c c %s\n", callsign);
 262                         flush_output();
 263                 }
 264         }
 265
 266         public void start_remote() {
 267                 if (debug)
 268                         System.out.printf("start remote\n");
 269                 set_radio();
 270                 printf("p\nE 0\n");
 271                 flush_input();
 272                 remote = true;
 273         }
 274
 275         public void stop_remote() {
 276                 if (debug)
 277                         System.out.printf("stop remote\n");
 278                 flush_input();
 279                 printf ("~");
 280                 flush_output();
 281                 remote = false;
 282         }
 283
 284         public AltosSerial(AltosDevice in_device) throws FileNotFoundException, AltosSerialInUseException {
 285                 device = in_device;
 286                 line = "";
 287                 monitor_mode = false;
 288                 monitors = new LinkedList<LinkedBlockingQueue<AltosLine>> ();
 289                 reply_queue = new LinkedBlockingQueue<AltosLine> ();
 290                 open();
 291         }
 292 }