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   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 android.os.Handler;
  22
  23 import org.altusmetrum.altoslib_14.*;
  24
  25 public abstract class AltosDroidLink extends AltosLink {
  26
  27         Handler         handler;
  28
  29         Thread          input_thread   = null;
  30
  31         public double frequency() {
  32                 return frequency;
  33         }
  34
  35         public int telemetry_rate() {
  36                 return telemetry_rate;
  37         }
  38
  39         public void save_frequency() {
  40                 AltosPreferences.set_frequency(0, frequency);
  41         }
  42
  43         public void save_telemetry_rate() {
  44                 AltosPreferences.set_telemetry_rate(0, telemetry_rate);
  45         }
  46
  47         Object closed_lock = new Object();
  48         boolean closing = false;
  49         boolean closed = false;
  50
  51         public boolean closed() {
  52                 synchronized(closed_lock) {
  53                         return closing;
  54                 }
  55         }
  56
  57         void connected() throws InterruptedException {
  58                 input_thread = new Thread(this);
  59                 input_thread.start();
  60
  61                 // Configure the newly connected device for telemetry
  62                 print("~\nE 0\n");
  63                 set_monitor(false);
  64                 AltosDebug.debug("ConnectThread: connected");
  65
  66                 /* Let TelemetryService know we're connected
  67                  */
  68                 handler.obtainMessage(TelemetryService.MSG_CONNECTED, this).sendToTarget();
  69
  70                 /* Notify other waiting threads that we're connected now
  71                  */
  72                 notifyAll();
  73         }
  74
  75         public void closing() {
  76                 synchronized(closed_lock) {
  77                         AltosDebug.debug("Marked closing true");
  78                         closing = true;
  79                 }
  80         }
  81
  82         private boolean actually_closed() {
  83                 synchronized(closed_lock) {
  84                         return closed;
  85                 }
  86         }
  87
  88         abstract void close_device();
  89
  90         public void close() {
  91                 AltosDebug.debug("close(): begin");
  92
  93                 closing();
  94
  95                 flush_output();
  96
  97                 synchronized (closed_lock) {
  98                         AltosDebug.debug("Marked closed true");
  99                         closed = true;
 100                 }
 101
 102                 close_device();
 103
 104                 synchronized(this) {
 105
 106                         if (input_thread != null) {
 107                                 AltosDebug.debug("close(): stopping input_thread");
 108                                 try {
 109                                         AltosDebug.debug("close(): input_thread.interrupt().....");
 110                                         input_thread.interrupt();
 111                                         AltosDebug.debug("close(): input_thread.join().....");
 112                                         input_thread.join();
 113                                 } catch (Exception e) {}
 114                                 input_thread = null;
 115                         }
 116                         notifyAll();
 117                 }
 118         }
 119
 120         abstract int write(byte[] buffer, int len);
 121
 122         abstract int read(byte[] buffer, int len);
 123
 124         private static final int buffer_size = 64;
 125
 126         private byte[] in_buffer = new byte[buffer_size];
 127         private byte[] out_buffer = new byte[buffer_size];
 128         private int buffer_len = 0;
 129         private int buffer_off = 0;
 130         private int out_buffer_off = 0;
 131
 132         private byte[] debug_chars = new byte[buffer_size];
 133         private int debug_off;
 134
 135         private void debug_input(byte b) {
 136                 if (b == '\n') {
 137                         AltosDebug.debug("            " + new String(debug_chars, 0, debug_off));
 138                         debug_off = 0;
 139                 } else {
 140                         if (debug_off < buffer_size)
 141                                 debug_chars[debug_off++] = b;
 142                 }
 143         }
 144
 145         private void disconnected() {
 146                 if (closed()) {
 147                         AltosDebug.debug("disconnected after closed");
 148                         return;
 149                 }
 150
 151                 AltosDebug.debug("Sending disconnected message");
 152                 handler.obtainMessage(TelemetryService.MSG_DISCONNECTED, this).sendToTarget();
 153         }
 154
 155         public int getchar() {
 156
 157                 if (actually_closed())
 158                         return ERROR;
 159
 160                 while (buffer_off == buffer_len) {
 161                         buffer_len = read(in_buffer, buffer_size);
 162                         if (buffer_len < 0) {
 163                                 AltosDebug.debug("ERROR returned from getchar()");
 164                                 disconnected();
 165                                 return ERROR;
 166                         }
 167                         buffer_off = 0;
 168                 }
 169 //              if (AltosDebug.D)
 170 //                      debug_input(in_buffer[buffer_off]);
 171                 return in_buffer[buffer_off++];
 172         }
 173
 174         public void flush_output() {
 175                 super.flush_output();
 176
 177                 if (actually_closed()) {
 178                         out_buffer_off = 0;
 179                         return;
 180                 }
 181
 182                 while (out_buffer_off != 0) {
 183                         int     sent = write(out_buffer, out_buffer_off);
 184
 185                         if (sent <= 0) {
 186                                 AltosDebug.debug("flush_output() failed");
 187                                 out_buffer_off = 0;
 188                                 break;
 189                         }
 190
 191                         if (sent < out_buffer_off)
 192                                 System.arraycopy(out_buffer, 0, out_buffer, sent, out_buffer_off - sent);
 193
 194                         out_buffer_off -= sent;
 195                 }
 196         }
 197
 198         public void putchar(byte c) {
 199                 out_buffer[out_buffer_off++] = c;
 200                 if (out_buffer_off == buffer_size)
 201                         flush_output();
 202         }
 203
 204         public void print(String data) {
 205                 byte[] bytes = data.getBytes();
 206 //              AltosDebug.debug(data.replace('\n', '\\'));
 207                 for (byte b : bytes)
 208                         putchar(b);
 209         }
 210
 211         public AltosDroidLink(Handler handler) {
 212                 this.handler = handler;
 213         }
 214 }