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   1 /*
   2  * Copyright © 2009 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 #include "cc.h"
  20 #include <string.h>
  21 #include <stdlib.h>
  22
  23 static void
  24 cc_parse_string(char *target, int len, char *source)
  25 {
  26         strncpy(target, source, len-1);
  27         target[len-1] = '\0';
  28 }
  29
  30 static void
  31 cc_parse_int(int *target, char *source)
  32 {
  33         *target = strtol(source, NULL, 0);
  34 }
  35
  36 static void
  37 cc_parse_hex(int *target, char *source)
  38 {
  39         *target = strtol(source, NULL, 16);
  40 }
  41
  42 static void
  43 cc_parse_pos(double *target, char *source)
  44 {
  45         int     deg;
  46         double  min;
  47         char    dir;
  48         double  r;
  49
  50         if (sscanf(source, "%d°%lf'%c", &deg, &min, &dir) != 3) {
  51                 *target = 0;
  52                 return;
  53         }
  54         r = deg + min / 60.0;
  55         if (dir == 'S' || dir == 'W')
  56                 r = -r;
  57         *target = r;
  58 }
  59
  60 #define PARSE_MAX_WORDS 512
  61
  62 int
  63 cc_telem_parse(const char *input_line, struct cc_telem *telem)
  64 {
  65         char *saveptr;
  66         char *raw_words[PARSE_MAX_WORDS];
  67         char **words;
  68         int version = 0;
  69         int nword;
  70         char line_buf[8192], *line;
  71         int     tracking_pos;
  72
  73         /* avoid smashing our input parameter */
  74         strncpy (line_buf, input_line, sizeof (line_buf)-1);
  75         line_buf[sizeof(line_buf) - 1] = '\0';
  76         line = line_buf;
  77         for (nword = 0; nword < PARSE_MAX_WORDS; nword++) {
  78                 raw_words[nword] = strtok_r(line, " \t\n", &saveptr);
  79                 line = NULL;
  80                 if (raw_words[nword] == NULL)
  81                         break;
  82         }
  83         if (nword < 36)
  84                 return FALSE;
  85         words = raw_words;
  86         if (strcmp(words[0], "VERSION") == 0) {
  87                 cc_parse_int(&version, words[1]);
  88                 words += 2;
  89                 nword -= 2;
  90         }
  91
  92         if (strcmp(words[0], "CALL") != 0)
  93                 return FALSE;
  94         cc_parse_string(telem->callsign, sizeof (telem->callsign), words[1]);
  95         cc_parse_int(&telem->serial, words[3]);
  96
  97         if (version >= 2) {
  98                 cc_parse_int(&telem->flight, words[5]);
  99                 words += 2;
 100                 nword -= 2;
 101         } else
 102                 telem->flight = 0;
 103
 104         cc_parse_int(&telem->rssi, words[5]);
 105         if (version <= 2) {
 106                 /* Older telemetry versions mis-computed the rssi value */
 107                 telem->rssi = (telem->rssi + 74) / 2 - 74;
 108         }
 109         cc_parse_string(telem->state, sizeof (telem->state), words[9]);
 110         cc_parse_int(&telem->tick, words[10]);
 111         cc_parse_int(&telem->accel, words[12]);
 112         cc_parse_int(&telem->pres, words[14]);
 113         cc_parse_int(&telem->temp, words[16]);
 114         cc_parse_int(&telem->batt, words[18]);
 115         cc_parse_int(&telem->drogue, words[20]);
 116         cc_parse_int(&telem->main, words[22]);
 117         cc_parse_int(&telem->flight_accel, words[24]);
 118         cc_parse_int(&telem->ground_accel, words[26]);
 119         cc_parse_int(&telem->flight_vel, words[28]);
 120         cc_parse_int(&telem->flight_pres, words[30]);
 121         cc_parse_int(&telem->ground_pres, words[32]);
 122         if (version >= 1) {
 123                 cc_parse_int(&telem->accel_plus_g, words[34]);
 124                 cc_parse_int(&telem->accel_minus_g, words[36]);
 125                 words += 4;
 126                 nword -= 4;
 127         } else {
 128                 telem->accel_plus_g = telem->ground_accel;
 129                 telem->accel_minus_g = telem->ground_accel + 530;
 130         }
 131         cc_parse_int(&telem->gps.nsat, words[34]);
 132         if (strcmp (words[36], "unlocked") == 0) {
 133                 telem->gps.gps_connected = 1;
 134                 telem->gps.gps_locked = 0;
 135                 telem->gps.gps_time.year = telem->gps.gps_time.month = telem->gps.gps_time.day = 0;
 136                 telem->gps.gps_time.hour = telem->gps.gps_time.minute = telem->gps.gps_time.second = 0;
 137                 telem->gps.lat = telem->gps.lon = 0;
 138                 telem->gps.alt = 0;
 139                 tracking_pos = 37;
 140         } else if (nword >= 40) {
 141                 telem->gps.gps_locked = 1;
 142                 telem->gps.gps_connected = 1;
 143                 if (version >= 2) {
 144                         sscanf(words[36], "%d-%d-%d",
 145                                &telem->gps.gps_time.year,
 146                                &telem->gps.gps_time.month,
 147                                &telem->gps.gps_time.day);
 148                         words += 1;
 149                         nword -= 1;
 150                 } else {
 151                         telem->gps.gps_time.year = telem->gps.gps_time.month = telem->gps.gps_time.day = 0;
 152                 }
 153                 sscanf(words[36], "%d:%d:%d", &telem->gps.gps_time.hour, &telem->gps.gps_time.minute, &telem->gps.gps_time.second);
 154                 cc_parse_pos(&telem->gps.lat, words[37]);
 155                 cc_parse_pos(&telem->gps.lon, words[38]);
 156                 sscanf(words[39], "%dm", &telem->gps.alt);
 157                 tracking_pos = 46;
 158         } else {
 159                 telem->gps.gps_connected = 0;
 160                 telem->gps.gps_locked = 0;
 161                 telem->gps.gps_time.year = telem->gps.gps_time.month = telem->gps.gps_time.day = 0;
 162                 telem->gps.gps_time.hour = telem->gps.gps_time.minute = telem->gps.gps_time.second = 0;
 163                 telem->gps.lat = telem->gps.lon = 0;
 164                 telem->gps.alt = 0;
 165                 tracking_pos = -1;
 166         }
 167         if (nword >= 46) {
 168                 telem->gps.gps_extended = 1;
 169                 sscanf(words[40], "%lfm/s", &telem->gps.ground_speed);
 170                 sscanf(words[41], "%d", &telem->gps.course);
 171                 sscanf(words[42], "%lfm/s", &telem->gps.climb_rate);
 172                 sscanf(words[43], "%lf", &telem->gps.hdop);
 173                 sscanf(words[44], "%d", &telem->gps.h_error);
 174                 sscanf(words[45], "%d", &telem->gps.v_error);
 175         } else {
 176                 telem->gps.gps_extended = 0;
 177                 telem->gps.ground_speed = 0;
 178                 telem->gps.course = 0;
 179                 telem->gps.climb_rate = 0;
 180                 telem->gps.hdop = 0;
 181                 telem->gps.h_error = 0;
 182                 telem->gps.v_error = 0;
 183         }
 184         if (tracking_pos >= 0 && nword >= tracking_pos + 2 && strcmp(words[tracking_pos], "SAT") == 0) {
 185                 int     c, n, pos;
 186                 int     per_sat;
 187                 int     state;
 188
 189                 if (version >= 2)
 190                         per_sat = 2;
 191                 else
 192                         per_sat = 3;
 193                 cc_parse_int(&n, words[tracking_pos + 1]);
 194                 pos = tracking_pos + 2;
 195                 if (nword >= pos + n * per_sat) {
 196                         telem->gps_tracking.channels = n;
 197                         for (c = 0; c < n; c++) {
 198                                 cc_parse_int(&telem->gps_tracking.sats[c].svid,
 199                                                  words[pos + 0]);
 200                                 if (version < 2)
 201                                         cc_parse_hex(&state, words[pos + 1]);
 202                                 cc_parse_int(&telem->gps_tracking.sats[c].c_n0,
 203                                                  words[pos + per_sat - 1]);
 204                                 pos += per_sat;
 205                         }
 206                 } else {
 207                         telem->gps_tracking.channels = 0;
 208                 }
 209         } else {
 210                 telem->gps_tracking.channels = 0;
 211         }
 212         return TRUE;
 213 }