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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         altos_device 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
  51         public void run () {
  52                 int c;
  53
  54                 try {
  55                         for (;;) {
  56                                 c = libaltos.altos_getchar(altos, 0);
  57                                 if (Thread.interrupted())
  58                                         break;
  59                                 if (c == libaltosConstants.LIBALTOS_ERROR) {
  60                                         for (int e = 0; e < monitors.size(); e++) {
  61                                                 LinkedBlockingQueue<AltosLine> q = monitors.get(e);
  62                                                 q.put(new AltosLine());
  63                                         }
  64                                         reply_queue.put (new AltosLine());
  65                                         break;
  66                                 }
  67                                 if (c == libaltosConstants.LIBALTOS_TIMEOUT)
  68                                         continue;
  69                                 if (c == '\r')
  70                                         continue;
  71                                 synchronized(this) {
  72                                         if (c == '\n') {
  73                                                 if (line_count != 0) {
  74                                                         try {
  75                                                                 line = new String(line_bytes, 0, line_count, "UTF-8");
  76                                                         } catch (UnsupportedEncodingException ue) {
  77                                                                 line = "";
  78                                                                 for (int i = 0; i < line_count; i++)
  79                                                                         line = line + line_bytes[i];
  80                                                         }
  81                                                         if (line.startsWith("VERSION") || line.startsWith("CRC")) {
  82                                                                 for (int e = 0; e < monitors.size(); e++) {
  83                                                                         LinkedBlockingQueue<AltosLine> q = monitors.get(e);
  84                                                                         q.put(new AltosLine (line));
  85                                                                 }
  86                                                         } else {
  87 //                                                              System.out.printf("GOT: %s\n", line);
  88                                                                 reply_queue.put(new AltosLine (line));
  89                                                         }
  90                                                         line_count = 0;
  91                                                         line = "";
  92                                                 }
  93                                         } else {
  94                                                 if (line_bytes == null) {
  95                                                         line_bytes = new byte[256];
  96                                                 } else if (line_count == line_bytes.length) {
  97                                                         byte[] new_line_bytes = new byte[line_count * 2];
  98                                                         System.arraycopy(line_bytes, 0, new_line_bytes, 0, line_count);
  99                                                         line_bytes = new_line_bytes;
 100                                                 }
 101                                                 line_bytes[line_count] = (byte) c;
 102                                                 line_count++;
 103                                         }
 104                                 }
 105                         }
 106                 } catch (InterruptedException e) {
 107                 }
 108         }
 109
 110         public void flush_output() {
 111                 if (altos != null)
 112                         libaltos.altos_flush(altos);
 113         }
 114
 115         public void flush_input() {
 116                 flush_output();
 117                 try {
 118                         Thread.sleep(200);
 119                 } catch (InterruptedException ie) {
 120                 }
 121                 synchronized(this) {
 122                         if (!"VERSION".startsWith(line) &&
 123                             !line.startsWith("VERSION"))
 124                                 line = "";
 125                         reply_queue.clear();
 126                 }
 127         }
 128
 129         public String get_reply() throws InterruptedException {
 130                 flush_output();
 131                 AltosLine line = reply_queue.take();
 132                 return line.line;
 133         }
 134
 135         public void add_monitor(LinkedBlockingQueue<AltosLine> q) {
 136                 set_monitor(true);
 137                 monitors.add(q);
 138         }
 139
 140         public void remove_monitor(LinkedBlockingQueue<AltosLine> q) {
 141                 monitors.remove(q);
 142                 if (monitors.isEmpty())
 143                         set_monitor(false);
 144         }
 145
 146         public void close() {
 147                 if (altos != null) {
 148                         libaltos.altos_close(altos);
 149                 }
 150                 if (input_thread != null) {
 151                         try {
 152                                 input_thread.interrupt();
 153                                 input_thread.join();
 154                         } catch (InterruptedException e) {
 155                         }
 156                         input_thread = null;
 157                 }
 158                 if (altos != null) {
 159                         libaltos.altos_free(altos);
 160                         altos = null;
 161                 }
 162                 synchronized (devices_opened) {
 163                         devices_opened.remove(device.getPath());
 164                 }
 165         }
 166
 167         public void putc(char c) {
 168                 if (altos != null)
 169                         libaltos.altos_putchar(altos, c);
 170         }
 171
 172         public void print(String data) {
 173 //              System.out.printf("\"%s\" ", data);
 174                 for (int i = 0; i < data.length(); i++)
 175                         putc(data.charAt(i));
 176         }
 177
 178         public void printf(String format, Object ... arguments) {
 179                 print(String.format(format, arguments));
 180         }
 181
 182         private void open() throws FileNotFoundException, AltosSerialInUseException {
 183                 synchronized (devices_opened) {
 184                         if (devices_opened.contains(device.getPath()))
 185                                 throw new AltosSerialInUseException(device);
 186                         devices_opened.add(device.getPath());
 187                 }
 188                 close();
 189                 altos = libaltos.altos_open(device);
 190                 if (altos == null)
 191                         throw new FileNotFoundException(device.getPath());
 192                 input_thread = new Thread(this);
 193                 input_thread.start();
 194                 print("~\nE 0\n");
 195                 flush_output();
 196                 set_monitor(monitor_mode);
 197                 set_channel(AltosPreferences.channel(device.getSerial()));
 198                 set_callsign(AltosPreferences.callsign());
 199         }
 200
 201         public void set_channel(int channel) {
 202                 if (altos != null) {
 203                         if (monitor_mode)
 204                                 printf("m 0\nc r %d\nm 1\n", channel);
 205                         else
 206                                 printf("c r %d\n", channel);
 207                         flush_output();
 208                 }
 209         }
 210
 211         void set_monitor(boolean monitor) {
 212                 monitor_mode = monitor;
 213                 if (altos != null) {
 214                         if (monitor)
 215                                 printf("m 1\n");
 216                         else
 217                                 printf("m 0\n");
 218                         flush_output();
 219                 }
 220         }
 221
 222         public void set_callsign(String callsign) {
 223                 if (altos != null) {
 224                         printf ("c c %s\n", callsign);
 225                         flush_output();
 226                 }
 227         }
 228
 229         public AltosSerial(altos_device in_device) throws FileNotFoundException, AltosSerialInUseException {
 230                 device = in_device;
 231                 line = "";
 232                 monitor_mode = false;
 233                 monitors = new LinkedList<LinkedBlockingQueue<AltosLine>> ();
 234                 reply_queue = new LinkedBlockingQueue<AltosLine> ();
 235                 open();
 236         }
 237 }