git.gag.com Git - fw/altos/blob - altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidLink.java

   1 /*
   2  * Copyright © 2015 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; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 package org.altusmetrum.AltosDroid;
  20
  21 import java.io.IOException;
  22 import java.io.InputStream;
  23 import java.io.OutputStream;
  24 import java.util.UUID;
  25
  26 import android.os.Handler;
  27
  28 import org.altusmetrum.altoslib_13.*;
  29
  30 public abstract class AltosDroidLink extends AltosLink {
  31
  32         Handler         handler;
  33
  34         Thread          input_thread   = null;
  35
  36         public double frequency() {
  37                 return frequency;
  38         }
  39
  40         public int telemetry_rate() {
  41                 return telemetry_rate;
  42         }
  43
  44         public void save_frequency() {
  45                 AltosPreferences.set_frequency(0, frequency);
  46         }
  47
  48         public void save_telemetry_rate() {
  49                 AltosPreferences.set_telemetry_rate(0, telemetry_rate);
  50         }
  51
  52         Object closed_lock = new Object();
  53         boolean closing = false;
  54         boolean closed = false;
  55
  56         public boolean closed() {
  57                 synchronized(closed_lock) {
  58                         return closing;
  59                 }
  60         }
  61
  62         void connected() throws InterruptedException {
  63                 input_thread = new Thread(this);
  64                 input_thread.start();
  65
  66                 // Configure the newly connected device for telemetry
  67                 print("~\nE 0\n");
  68                 set_monitor(false);
  69                 AltosDebug.debug("ConnectThread: connected");
  70
  71                 /* Let TelemetryService know we're connected
  72                  */
  73                 handler.obtainMessage(TelemetryService.MSG_CONNECTED, this).sendToTarget();
  74
  75                 /* Notify other waiting threads that we're connected now
  76                  */
  77                 notifyAll();
  78         }
  79
  80         public void closing() {
  81                 synchronized(closed_lock) {
  82                         AltosDebug.debug("Marked closing true");
  83                         closing = true;
  84                 }
  85         }
  86
  87         private boolean actually_closed() {
  88                 synchronized(closed_lock) {
  89                         return closed;
  90                 }
  91         }
  92
  93         abstract void close_device();
  94
  95         public void close() {
  96                 AltosDebug.debug("close(): begin");
  97
  98                 closing();
  99
 100                 flush_output();
 101
 102                 synchronized (closed_lock) {
 103                         AltosDebug.debug("Marked closed true");
 104                         closed = true;
 105                 }
 106
 107                 close_device();
 108
 109                 synchronized(this) {
 110
 111                         if (input_thread != null) {
 112                                 AltosDebug.debug("close(): stopping input_thread");
 113                                 try {
 114                                         AltosDebug.debug("close(): input_thread.interrupt().....");
 115                                         input_thread.interrupt();
 116                                         AltosDebug.debug("close(): input_thread.join().....");
 117                                         input_thread.join();
 118                                 } catch (Exception e) {}
 119                                 input_thread = null;
 120                         }
 121                         notifyAll();
 122                 }
 123         }
 124
 125         abstract int write(byte[] buffer, int len);
 126
 127         abstract int read(byte[] buffer, int len);
 128
 129         private static final int buffer_size = 64;
 130
 131         private byte[] in_buffer = new byte[buffer_size];
 132         private byte[] out_buffer = new byte[buffer_size];
 133         private int buffer_len = 0;
 134         private int buffer_off = 0;
 135         private int out_buffer_off = 0;
 136
 137         private byte[] debug_chars = new byte[buffer_size];
 138         private int debug_off;
 139
 140         private void debug_input(byte b) {
 141                 if (b == '\n') {
 142                         AltosDebug.debug("            " + new String(debug_chars, 0, debug_off));
 143                         debug_off = 0;
 144                 } else {
 145                         if (debug_off < buffer_size)
 146                                 debug_chars[debug_off++] = b;
 147                 }
 148         }
 149
 150         private void disconnected() {
 151                 if (closed()) {
 152                         AltosDebug.debug("disconnected after closed");
 153                         return;
 154                 }
 155
 156                 AltosDebug.debug("Sending disconnected message");
 157                 handler.obtainMessage(TelemetryService.MSG_DISCONNECTED, this).sendToTarget();
 158         }
 159
 160         public int getchar() {
 161
 162                 if (actually_closed())
 163                         return ERROR;
 164
 165                 while (buffer_off == buffer_len) {
 166                         buffer_len = read(in_buffer, buffer_size);
 167                         if (buffer_len < 0) {
 168                                 AltosDebug.debug("ERROR returned from getchar()");
 169                                 disconnected();
 170                                 return ERROR;
 171                         }
 172                         buffer_off = 0;
 173                 }
 174 //              if (AltosDebug.D)
 175 //                      debug_input(in_buffer[buffer_off]);
 176                 return in_buffer[buffer_off++];
 177         }
 178
 179         public void flush_output() {
 180                 super.flush_output();
 181
 182                 if (actually_closed()) {
 183                         out_buffer_off = 0;
 184                         return;
 185                 }
 186
 187                 while (out_buffer_off != 0) {
 188                         int     sent = write(out_buffer, out_buffer_off);
 189
 190                         if (sent <= 0) {
 191                                 AltosDebug.debug("flush_output() failed");
 192                                 out_buffer_off = 0;
 193                                 break;
 194                         }
 195
 196                         if (sent < out_buffer_off)
 197                                 System.arraycopy(out_buffer, 0, out_buffer, sent, out_buffer_off - sent);
 198
 199                         out_buffer_off -= sent;
 200                 }
 201         }
 202
 203         public void putchar(byte c) {
 204                 out_buffer[out_buffer_off++] = c;
 205                 if (out_buffer_off == buffer_size)
 206                         flush_output();
 207         }
 208
 209         public void print(String data) {
 210                 byte[] bytes = data.getBytes();
 211 //              AltosDebug.debug(data.replace('\n', '\\'));
 212                 for (byte b : bytes)
 213                         putchar(b);
 214         }
 215
 216         public AltosDroidLink(Handler handler) {
 217                 this.handler = handler;
 218         }
 219 }