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   1 /*
   2  * Copyright © 2011 Keith Packard <keithp@keithp.com>
   3  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  18  */
  19
  20
  21 package org.altusmetrum.AltosDroid;
  22
  23 import java.text.*;
  24 import java.io.*;
  25 import java.util.*;
  26 import java.util.concurrent.*;
  27 import android.os.Handler;
  28
  29 import org.altusmetrum.altoslib_13.*;
  30
  31
  32 public class TelemetryReader extends Thread {
  33
  34         int         crc_errors;
  35
  36         Handler     handler;
  37
  38         AltosLink   link;
  39
  40         LinkedBlockingQueue<AltosLine> telemQueue;
  41
  42         public AltosTelemetry read() throws ParseException, AltosCRCException, InterruptedException, IOException {
  43                 AltosLine l = telemQueue.take();
  44                 if (l.line == null)
  45                         throw new IOException("IO error");
  46                 AltosTelemetry telem = AltosTelemetryLegacy.parse(l.line);
  47                 return telem;
  48         }
  49
  50         public void close() {
  51                 link.remove_monitor(telemQueue);
  52                 link = null;
  53                 telemQueue.clear();
  54                 telemQueue = null;
  55         }
  56
  57         public void run() {
  58                 try {
  59                         AltosDebug.debug("starting loop");
  60                         while (telemQueue != null) {
  61                                 try {
  62                                         AltosTelemetry  telem = read();
  63                                         telem.set_frequency(link.frequency);
  64                                         handler.obtainMessage(TelemetryService.MSG_TELEMETRY, telem).sendToTarget();
  65                                 } catch (ParseException pp) {
  66                                         AltosDebug.error("Parse error: %d \"%s\"", pp.getErrorOffset(), pp.getMessage());
  67                                 } catch (AltosCRCException ce) {
  68                                         ++crc_errors;
  69                                         handler.obtainMessage(TelemetryService.MSG_CRC_ERROR, new Integer(crc_errors)).sendToTarget();
  70                                 }
  71                         }
  72                 } catch (InterruptedException ee) {
  73                 } catch (IOException ie) {
  74                         AltosDebug.error("IO exception in telemetry reader");
  75                         handler.obtainMessage(TelemetryService.MSG_DISCONNECTED, link).sendToTarget();
  76                 } finally {
  77                         close();
  78                 }
  79         }
  80
  81         public TelemetryReader (AltosLink in_link, Handler in_handler) {
  82                 AltosDebug.debug("connected TelemetryReader create started");
  83                 link    = in_link;
  84                 handler = in_handler;
  85
  86                 telemQueue = new LinkedBlockingQueue<AltosLine>();
  87                 link.add_monitor(telemQueue);
  88                 link.set_telemetry(AltosLib.ao_telemetry_standard);
  89
  90                 AltosDebug.debug("connected TelemetryReader created");
  91         }
  92 }