git.gag.com Git - fw/altos/blob - altoslib/AltosEepromFireTwo.java

   1 /*
   2  * Copyright © 2017 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.altoslib_11;
  20
  21 import java.io.*;
  22 import java.util.*;
  23 import java.text.*;
  24
  25 public class AltosEepromFireTwo extends AltosEeprom {
  26         public static final int record_length = 32;
  27
  28         public int record_length() { return record_length; }
  29
  30         /* AO_LOG_FLIGHT elements */
  31         public int flight() { return data16(0); }
  32         public int idle_pres() { return data16(2); }
  33         public int idle_thrust() { return data16(4); }
  34
  35         /* AO_LOG_STATE elements */
  36         public int state() { return data16(0); }
  37         public int reason() { return data16(2); }
  38
  39         /* AO_LOG_SENSOR elements */
  40         public int pres() { return data16(0); }
  41         public int thrust() { return data16(2); }
  42         public int temp(int i) { return data16(4+i*2); }
  43
  44         public AltosEepromFireTwo (AltosEepromChunk chunk, int start) throws ParseException {
  45                 parse_chunk(chunk, start);
  46         }
  47
  48         private static final double r_above = 5600.0;
  49         private static final double r_below = 10000.0;
  50         private static final double v_adc = 3.3;
  51
  52         private static double firetwo_adc(int raw) {
  53                 return raw / 4095.0;
  54         }
  55
  56         public static double adc_to_pa(int adc) {
  57
  58                 /* raw adc to processor voltage, then back through the
  59                  * voltage divider to the sensor voltage
  60                  */
  61
  62                 double  v = firetwo_adc(adc) * v_adc * (r_above + r_below) / r_below;
  63
  64                 /* Bound to ranges provided in sensor */
  65                 if (v < 0.5) v = 0.5;
  66                 if (v > 4.5) v = 4.5;
  67
  68                 double  psi = (v - 0.5) / 4.0 * 1600.0;
  69                 return AltosConvert.psi_to_pa(psi);
  70         }
  71
  72         public static double adc_to_n(int adc) {
  73                 double v = firetwo_adc(adc);
  74
  75                 /* this is a total guess */
  76                 return AltosConvert.lb_to_n(v * 298 * 9.807);
  77         }
  78
  79         public void update_state(AltosState state) {
  80                 super.update_state(state);
  81
  82                 switch (cmd) {
  83                 case AltosLib.AO_LOG_FLIGHT:
  84                         state.set_flight(flight());
  85                         state.set_ground_pressure(adc_to_pa(idle_pres()));
  86                         state.set_accel_g(0, -1);
  87                         break;
  88                 case AltosLib.AO_LOG_STATE:
  89                         state.set_state(state());
  90                         break;
  91                 case AltosLib.AO_LOG_SENSOR:
  92                         state.set_pressure(adc_to_pa(pres()));
  93                         state.set_accel(firetwo_adc(thrust()) * 100);
  94                         break;
  95                 }
  96         }
  97
  98         public AltosEepromFireTwo (String line) {
  99                 parse_string(line);
 100         }
 101
 102         static public LinkedList<AltosEeprom> read(FileInputStream input) {
 103                 LinkedList<AltosEeprom> firetwos = new LinkedList<AltosEeprom>();
 104
 105                 for (;;) {
 106                         try {
 107                                 String line = AltosLib.gets(input);
 108                                 if (line == null)
 109                                         break;
 110                                 try {
 111                                         AltosEepromFireTwo firetwo = new AltosEepromFireTwo(line);
 112
 113                                         if (firetwo.cmd != AltosLib.AO_LOG_INVALID)
 114                                                 firetwos.add(firetwo);
 115                                 } catch (Exception e) {
 116                                         System.out.printf ("exception\n");
 117                                 }
 118                         } catch (IOException ie) {
 119                                 break;
 120                         }
 121                 }
 122
 123                 return firetwos;
 124         }
 125 }