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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; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 #include "cc.h"
  19 #include <string.h>
  20 #include <stdlib.h>
  21
  22 static void
  23 cc_parse_string(char *target, int len, char *source)
  24 {
  25         strncpy(target, source, len-1);
  26         target[len-1] = '\0';
  27 }
  28
  29 static void
  30 cc_parse_int(int *target, char *source)
  31 {
  32         *target = strtol(source, NULL, 0);
  33 }
  34
  35 static void
  36 cc_parse_hex(int *target, char *source)
  37 {
  38         *target = strtol(source, NULL, 16);
  39 }
  40
  41 static void
  42 cc_parse_pos(double *target, char *source)
  43 {
  44         int     deg;
  45         double  min;
  46         char    dir;
  47         double  r;
  48
  49         if (sscanf(source, "%d°%lf'%c", &deg, &min, &dir) != 3) {
  50                 *target = 0;
  51                 return;
  52         }
  53         r = deg + min / 60.0;
  54         if (dir == 'S' || dir == 'W')
  55                 r = -r;
  56         *target = r;
  57 }
  58
  59 #define PARSE_MAX_WORDS 512
  60
  61 int
  62 cc_telem_parse(const char *input_line, struct cc_telem *telem)
  63 {
  64         char *saveptr;
  65         char *raw_words[PARSE_MAX_WORDS];
  66         char **words;
  67         int version = 0;
  68         int nword;
  69         char line_buf[8192], *line;
  70         int     tracking_pos;
  71
  72         /* avoid smashing our input parameter */
  73         strncpy (line_buf, input_line, sizeof (line_buf)-1);
  74         line_buf[sizeof(line_buf) - 1] = '\0';
  75         line = line_buf;
  76         for (nword = 0; nword < PARSE_MAX_WORDS; nword++) {
  77                 raw_words[nword] = strtok_r(line, " \t\n", &saveptr);
  78                 line = NULL;
  79                 if (raw_words[nword] == NULL)
  80                         break;
  81         }
  82         if (nword < 36)
  83                 return FALSE;
  84         words = raw_words;
  85         if (strcmp(words[0], "VERSION") == 0) {
  86                 cc_parse_int(&version, words[1]);
  87                 words += 2;
  88                 nword -= 2;
  89         }
  90
  91         if (strcmp(words[0], "CALL") != 0)
  92                 return FALSE;
  93         cc_parse_string(telem->callsign, sizeof (telem->callsign), words[1]);
  94         cc_parse_int(&telem->serial, words[3]);
  95
  96         if (version >= 2) {
  97                 cc_parse_int(&telem->flight, words[5]);
  98                 words += 2;
  99                 nword -= 2;
 100         } else
 101                 telem->flight = 0;
 102
 103         cc_parse_int(&telem->rssi, words[5]);
 104         if (version <= 2) {
 105                 /* Older telemetry versions mis-computed the rssi value */
 106                 telem->rssi = (telem->rssi + 74) / 2 - 74;
 107         }
 108         cc_parse_string(telem->state, sizeof (telem->state), words[9]);
 109         cc_parse_int(&telem->tick, words[10]);
 110         cc_parse_int(&telem->accel, words[12]);
 111         cc_parse_int(&telem->pres, words[14]);
 112         cc_parse_int(&telem->temp, words[16]);
 113         cc_parse_int(&telem->batt, words[18]);
 114         cc_parse_int(&telem->drogue, words[20]);
 115         cc_parse_int(&telem->main, words[22]);
 116         cc_parse_int(&telem->flight_accel, words[24]);
 117         cc_parse_int(&telem->ground_accel, words[26]);
 118         cc_parse_int(&telem->flight_vel, words[28]);
 119         cc_parse_int(&telem->flight_pres, words[30]);
 120         cc_parse_int(&telem->ground_pres, words[32]);
 121         if (version >= 1) {
 122                 cc_parse_int(&telem->accel_plus_g, words[34]);
 123                 cc_parse_int(&telem->accel_minus_g, words[36]);
 124                 words += 4;
 125                 nword -= 4;
 126         } else {
 127                 telem->accel_plus_g = telem->ground_accel;
 128                 telem->accel_minus_g = telem->ground_accel + 530;
 129         }
 130         cc_parse_int(&telem->gps.nsat, words[34]);
 131         if (strcmp (words[36], "unlocked") == 0) {
 132                 telem->gps.gps_connected = 1;
 133                 telem->gps.gps_locked = 0;
 134                 telem->gps.gps_time.year = telem->gps.gps_time.month = telem->gps.gps_time.day = 0;
 135                 telem->gps.gps_time.hour = telem->gps.gps_time.minute = telem->gps.gps_time.second = 0;
 136                 telem->gps.lat = telem->gps.lon = 0;
 137                 telem->gps.alt = 0;
 138                 tracking_pos = 37;
 139         } else if (nword >= 40) {
 140                 telem->gps.gps_locked = 1;
 141                 telem->gps.gps_connected = 1;
 142                 if (version >= 2) {
 143                         sscanf(words[36], "%d-%d-%d",
 144                                &telem->gps.gps_time.year,
 145                                &telem->gps.gps_time.month,
 146                                &telem->gps.gps_time.day);
 147                         words += 1;
 148                         nword -= 1;
 149                 } else {
 150                         telem->gps.gps_time.year = telem->gps.gps_time.month = telem->gps.gps_time.day = 0;
 151                 }
 152                 sscanf(words[36], "%d:%d:%d", &telem->gps.gps_time.hour, &telem->gps.gps_time.minute, &telem->gps.gps_time.second);
 153                 cc_parse_pos(&telem->gps.lat, words[37]);
 154                 cc_parse_pos(&telem->gps.lon, words[38]);
 155                 sscanf(words[39], "%dm", &telem->gps.alt);
 156                 tracking_pos = 46;
 157         } else {
 158                 telem->gps.gps_connected = 0;
 159                 telem->gps.gps_locked = 0;
 160                 telem->gps.gps_time.year = telem->gps.gps_time.month = telem->gps.gps_time.day = 0;
 161                 telem->gps.gps_time.hour = telem->gps.gps_time.minute = telem->gps.gps_time.second = 0;
 162                 telem->gps.lat = telem->gps.lon = 0;
 163                 telem->gps.alt = 0;
 164                 tracking_pos = -1;
 165         }
 166         if (nword >= 46) {
 167                 telem->gps.gps_extended = 1;
 168                 sscanf(words[40], "%lfm/s", &telem->gps.ground_speed);
 169                 sscanf(words[41], "%d", &telem->gps.course);
 170                 sscanf(words[42], "%lfm/s", &telem->gps.climb_rate);
 171                 sscanf(words[43], "%lf", &telem->gps.hdop);
 172                 sscanf(words[44], "%d", &telem->gps.h_error);
 173                 sscanf(words[45], "%d", &telem->gps.v_error);
 174         } else {
 175                 telem->gps.gps_extended = 0;
 176                 telem->gps.ground_speed = 0;
 177                 telem->gps.course = 0;
 178                 telem->gps.climb_rate = 0;
 179                 telem->gps.hdop = 0;
 180                 telem->gps.h_error = 0;
 181                 telem->gps.v_error = 0;
 182         }
 183         if (tracking_pos >= 0 && nword >= tracking_pos + 2 && strcmp(words[tracking_pos], "SAT") == 0) {
 184                 int     c, n, pos;
 185                 int     per_sat;
 186                 int     state;
 187
 188                 if (version >= 2)
 189                         per_sat = 2;
 190                 else
 191                         per_sat = 3;
 192                 cc_parse_int(&n, words[tracking_pos + 1]);
 193                 pos = tracking_pos + 2;
 194                 if (nword >= pos + n * per_sat) {
 195                         telem->gps_tracking.channels = n;
 196                         for (c = 0; c < n; c++) {
 197                                 cc_parse_int(&telem->gps_tracking.sats[c].svid,
 198                                                  words[pos + 0]);
 199                                 if (version < 2)
 200                                         cc_parse_hex(&state, words[pos + 1]);
 201                                 cc_parse_int(&telem->gps_tracking.sats[c].c_n0,
 202                                                  words[pos + per_sat - 1]);
 203                                 pos += per_sat;
 204                         }
 205                 } else {
 206                         telem->gps_tracking.channels = 0;
 207                 }
 208         } else {
 209                 telem->gps_tracking.channels = 0;
 210         }
 211         return TRUE;
 212 }