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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.concurrent.*;
  26 import android.os.Handler;
  27
  28 import org.altusmetrum.altoslib_14.*;
  29
  30
  31 public class TelemetryReader extends Thread {
  32
  33         int         crc_errors;
  34
  35         Handler     handler;
  36
  37         AltosLink   link;
  38
  39         LinkedBlockingQueue<AltosLine> telemQueue;
  40
  41         public AltosTelemetry read() throws ParseException, AltosCRCException, InterruptedException, IOException {
  42                 AltosLine l = telemQueue.take();
  43                 if (l.line == null)
  44                         throw new IOException("IO error");
  45                 AltosTelemetry telem = AltosTelemetryLegacy.parse(l.line);
  46                 return telem;
  47         }
  48
  49         public void close() {
  50                 link.remove_monitor(telemQueue);
  51                 link = null;
  52                 telemQueue.clear();
  53                 telemQueue = null;
  54         }
  55
  56         public void run() {
  57                 try {
  58                         AltosDebug.debug("starting loop");
  59                         while (telemQueue != null) {
  60                                 try {
  61                                         AltosTelemetry  telem = read();
  62                                         telem.set_frequency(link.frequency);
  63                                         handler.obtainMessage(TelemetryService.MSG_TELEMETRY, telem).sendToTarget();
  64                                 } catch (ParseException pp) {
  65                                         AltosDebug.error("Parse error: %d \"%s\"", pp.getErrorOffset(), pp.getMessage());
  66                                 } catch (AltosCRCException ce) {
  67                                         ++crc_errors;
  68                                         handler.obtainMessage(TelemetryService.MSG_CRC_ERROR, new Integer(crc_errors)).sendToTarget();
  69                                 }
  70                         }
  71                 } catch (InterruptedException ee) {
  72                 } catch (IOException ie) {
  73                         AltosDebug.error("IO exception in telemetry reader");
  74                         handler.obtainMessage(TelemetryService.MSG_DISCONNECTED, link).sendToTarget();
  75                 } finally {
  76                         close();
  77                 }
  78         }
  79
  80         public TelemetryReader (AltosLink in_link, Handler in_handler) {
  81                 AltosDebug.debug("connected TelemetryReader create started");
  82                 link    = in_link;
  83                 handler = in_handler;
  84
  85                 telemQueue = new LinkedBlockingQueue<AltosLine>();
  86                 link.add_monitor(telemQueue);
  87                 link.set_telemetry(AltosLib.ao_telemetry_standard);
  88
  89                 AltosDebug.debug("connected TelemetryReader created");
  90         }
  91 }