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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
  30 import libaltosJNI.*;
  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
  38 public class AltosSerial implements Runnable {
  39
  40         SWIGTYPE_p_altos_file altos;
  41         LinkedList<LinkedBlockingQueue<AltosLine>> monitors;
  42         LinkedBlockingQueue<AltosLine> reply_queue;
  43         Thread input_thread;
  44         String line;
  45         byte[] line_bytes;
  46         int line_count;
  47         boolean monitor_mode;
  48
  49         public void run () {
  50                 int c;
  51
  52                 try {
  53                         for (;;) {
  54                                 c = libaltos.altos_getchar(altos, 0);
  55                                 if (Thread.interrupted())
  56                                         break;
  57                                 if (c == libaltosConstants.LIBALTOS_ERROR) {
  58                                         for (int e = 0; e < monitors.size(); e++) {
  59                                                 LinkedBlockingQueue<AltosLine> q = monitors.get(e);
  60                                                 q.put(new AltosLine());
  61                                         }
  62                                         reply_queue.put (new AltosLine());
  63                                         break;
  64                                 }
  65                                 if (c == libaltosConstants.LIBALTOS_TIMEOUT)
  66                                         continue;
  67                                 if (c == '\r')
  68                                         continue;
  69                                 synchronized(this) {
  70                                         if (c == '\n') {
  71                                                 if (line_count != 0) {
  72                                                         try {
  73                                                                 line = new String(line_bytes, 0, line_count, "UTF-8");
  74                                                         } catch (UnsupportedEncodingException ue) {
  75                                                                 line = "";
  76                                                                 for (int i = 0; i < line_count; i++)
  77                                                                         line = line + line_bytes[i];
  78                                                         }
  79                                                         if (line.startsWith("VERSION") || line.startsWith("CRC")) {
  80                                                                 for (int e = 0; e < monitors.size(); e++) {
  81                                                                         LinkedBlockingQueue<AltosLine> q = monitors.get(e);
  82                                                                         q.put(new AltosLine (line));
  83                                                                 }
  84                                                         } else {
  85 //                                                              System.out.printf("GOT: %s\n", line);
  86                                                                 reply_queue.put(new AltosLine (line));
  87                                                         }
  88                                                         line_count = 0;
  89                                                         line = "";
  90                                                 }
  91                                         } else {
  92                                                 if (line_bytes == null) {
  93                                                         line_bytes = new byte[256];
  94                                                 } else if (line_count == line_bytes.length) {
  95                                                         byte[] new_line_bytes = new byte[line_count * 2];
  96                                                         System.arraycopy(line_bytes, 0, new_line_bytes, 0, line_count);
  97                                                         line_bytes = new_line_bytes;
  98                                                 }
  99                                                 line_bytes[line_count] = (byte) c;
 100                                                 line_count++;
 101                                         }
 102                                 }
 103                         }
 104                 } catch (InterruptedException e) {
 105                 }
 106         }
 107
 108         public void flush_output() {
 109                 if (altos != null)
 110                         libaltos.altos_flush(altos);
 111         }
 112
 113         public void flush_input() {
 114                 flush_output();
 115                 try {
 116                         Thread.sleep(200);
 117                 } catch (InterruptedException ie) {
 118                 }
 119                 synchronized(this) {
 120                         if (!"VERSION".startsWith(line) &&
 121                             !line.startsWith("VERSION"))
 122                                 line = "";
 123                         reply_queue.clear();
 124                 }
 125         }
 126
 127         public String get_reply() throws InterruptedException {
 128                 flush_output();
 129                 AltosLine line = reply_queue.take();
 130                 return line.line;
 131         }
 132
 133         public void add_monitor(LinkedBlockingQueue<AltosLine> q) {
 134                 set_monitor(true);
 135                 monitors.add(q);
 136         }
 137
 138         public void remove_monitor(LinkedBlockingQueue<AltosLine> q) {
 139                 monitors.remove(q);
 140                 if (monitors.isEmpty())
 141                         set_monitor(false);
 142         }
 143
 144         public boolean opened() {
 145                 return altos != null;
 146         }
 147
 148         public void close() {
 149                 if (altos != null) {
 150                         libaltos.altos_close(altos);
 151                 }
 152                 if (input_thread != null) {
 153                         try {
 154                                 input_thread.interrupt();
 155                                 input_thread.join();
 156                         } catch (InterruptedException e) {
 157                         }
 158                         input_thread = null;
 159                 }
 160                 if (altos != null) {
 161                         libaltos.altos_free(altos);
 162                         altos = null;
 163                 }
 164         }
 165
 166         public void putc(char c) {
 167                 if (altos != null)
 168                         libaltos.altos_putchar(altos, c);
 169         }
 170
 171         public void print(String data) {
 172 //              System.out.printf("\"%s\" ", data);
 173                 for (int i = 0; i < data.length(); i++)
 174                         putc(data.charAt(i));
 175         }
 176
 177         public void printf(String format, Object ... arguments) {
 178                 print(String.format(format, arguments));
 179         }
 180
 181         public void open(altos_device device) throws FileNotFoundException {
 182                 close();
 183                 altos = libaltos.altos_open(device);
 184                 if (altos == null)
 185                         throw new FileNotFoundException(device.getPath());
 186                 input_thread = new Thread(this);
 187                 input_thread.start();
 188                 print("~\nE 0\n");
 189                 flush_output();
 190                 set_monitor(monitor_mode);
 191                 set_channel(AltosPreferences.channel(device.getSerial()));
 192                 set_callsign(AltosPreferences.callsign());
 193         }
 194
 195         public void set_channel(int channel) {
 196                 if (altos != null) {
 197                         if (monitor_mode)
 198                                 printf("m 0\nc r %d\nm 1\n", channel);
 199                         else
 200                                 printf("c r %d\n", channel);
 201                         flush_output();
 202                 }
 203         }
 204
 205         void set_monitor(boolean monitor) {
 206                 monitor_mode = monitor;
 207                 if (altos != null) {
 208                         if (monitor)
 209                                 printf("m 1\n");
 210                         else
 211                                 printf("m 0\n");
 212                         flush_output();
 213                 }
 214         }
 215
 216         public void set_callsign(String callsign) {
 217                 if (altos != null) {
 218                         printf ("c c %s\n", callsign);
 219                         flush_output();
 220                 }
 221         }
 222
 223         public AltosSerial() {
 224                 altos = null;
 225                 input_thread = null;
 226                 line = "";
 227                 monitor_mode = false;
 228                 monitors = new LinkedList<LinkedBlockingQueue<AltosLine>> ();
 229                 reply_queue = new LinkedBlockingQueue<AltosLine> ();
 230         }
 231 }