MTS/IMTS: (Improved) Mobile Telephone Service
Implementation of the 0G Mobile Phone Network of US and Canada MTS or IMTS mode is selectable, als well as 5 or 7 digit mode.
This commit is contained in:
Andreas Eversberg
289
src/imts/main.c
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289
src/imts/main.c
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/* MTS/IMTS main
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*
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* (C) 2019 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <math.h>
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#include "../libsample/sample.h"
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#include "../libmobile/main_mobile.h"
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#include "../libdebug/debug.h"
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#include "../libtimer/timer.h"
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#include "../libmobile/call.h"
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#include "../liboptions/options.h"
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#include "../amps/tones.h"
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#include "../amps/outoforder.h"
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#include "../amps/noanswer.h"
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#include "../amps/invalidnumber.h"
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#include "../amps/congestion.h"
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#include "imts.h"
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#include "dsp.h"
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/* settings */
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static double squelch_db = -INFINITY;
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static int ptt = 0;
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static int station_length = 0; /* defined by mode */
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static double fast_seize = 0.0;
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static enum mode mode = MODE_IMTS;
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static char operator[32] = "010";
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static double detector_test_length_1 = 0.0;
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static double detector_test_length_2 = 0.0;
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static double detector_test_length_3 = 0.0;
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void print_help(const char *arg0)
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{
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main_mobile_print_help(arg0, "-b 5 ");
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/* - - */
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printf(" -S --squelch <dB> | auto\n");
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printf(" Use given RF level to detect loss of signal. When the signal gets lost\n");
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printf(" and stays below this level, the connection is released.\n");
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printf(" Use 'auto' to do automatic noise floor calibration to detect loss.\n");
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printf(" Only works with SDR! (disabled by default)\n");
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printf(" -P --push-to-talk\n");
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printf(" Allow push-to-talk operation for IMTS mode. (MTS always uses it.)\n");
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printf(" This adds extra delay to received audio, to eliminate noise when the\n");
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printf(" transmitter of the phone is turned off. Also this disables release on\n");
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printf(" loss of RF signal. (Squelch is required for this to operate.)\n");
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printf(" -5 --five\n");
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printf(" -7 --seven\n");
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printf(" Force station ID length (default is 7 for IMTS, 5 for MTS)\n");
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printf(" -F --fast-seize <delay in ms>\n");
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printf(" To compensate audio processing latency, give delay when to respond,\n");
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printf(" after detection of Guard tone from mobile phone.\n");
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printf(" Run software in loopback mode '-l 2' to measure round trip delay.\n");
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printf(" Substract delay from 350 ms. If the phone has different Guard tone\n");
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printf(" length, substract from that value.\n");
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printf(" -D --detector-test <idle length> <seize lenght> <silence length>\n");
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printf(" Transmit detector test signal, to adjust decoder inside mobile phone.\n");
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printf(" Give length of idle / seize and silence in seconds. Listen to it with\n");
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printf(" a radio receiver. To exclude an element, set its length to '0'.\n");
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printf(" Example: '-D 0.5 0.5 0' plays alternating idle/seize tone.\n");
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printf("\nMTS mode options\n");
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printf(" -M --mts\n");
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printf(" Run base station in MTS mode, rather than in IMTS mode.\n");
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printf(" -O --operator <number>\n");
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printf(" Give number to dial when mobile station initiated a call in MTS mode.\n");
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printf(" Because there is no dial on the mobile phone, operator assistance is\n");
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printf(" required to complete the call.\n");
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printf(" By default, the operator '%s' is dialed.\n", operator);
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printf(" -D --detector-test <600 Hz length> <1500 Hz lenght> <silence length>\n");
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printf(" Transmit detector test signal, to adjust decoder inside MTS phone.\n");
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printf(" Give length of 600/1500 Hz and silence in seconds. Listen to it with\n");
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printf(" a radio receiver. To exclude an element, set its length to '0'.\n");
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printf(" Example: '-D 0.5 0.5 0' plays alternating 600/1500 Hz tone.\n");
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printf("\nstation-id: Give %d digits of station-id, you don't need to enter it after\n", station_length);
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printf(" every start of this program.\n");
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main_mobile_print_hotkeys();
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}
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static void add_options(void)
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{
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main_mobile_add_options();
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option_add('S', "squelch", 1);
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option_add('P', "push-to-talk", 0);
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option_add('5', "five", 0);
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option_add('7', "seven", 0);
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option_add('F', "fast-seize", 1);
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option_add('D', "decoder-test", 3);
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option_add('M', "mts", 0);
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option_add('O', "operator", 1);
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}
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static int handle_options(int short_option, int argi, char **argv)
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{
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switch (short_option) {
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case 'S':
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if (!strcasecmp(argv[argi], "auto"))
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squelch_db = 0.0;
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else
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squelch_db = atof(argv[argi]);
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break;
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case 'P':
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ptt = 1;
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break;
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case '5':
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station_length = 5;
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break;
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case '7':
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station_length = 7;
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break;
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case 'F':
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fast_seize = atof(argv[argi]) / 1000.0;
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if (fast_seize < 0.0)
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fast_seize = 0.0;
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break;
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case 'D':
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detector_test_length_1 = atof(argv[argi++]);
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detector_test_length_2 = atof(argv[argi++]);
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detector_test_length_3 = atof(argv[argi++]);
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break;
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case 'M':
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mode = MODE_MTS;
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ptt = 1;
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break;
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case 'O':
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strncpy(operator, argv[argi], sizeof(operator) - 1);
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operator[sizeof(operator) - 1] = '\0';
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break;
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default:
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return main_mobile_handle_options(short_option, argi, argv);
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}
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return 1;
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}
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int main(int argc, char *argv[])
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{
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int rc, argi;
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const char *station_id = "";
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int i;
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/* init common tones */
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init_tones();
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init_outoforder();
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init_noanswer();
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init_invalidnumber();
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init_congestion();
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main_mobile_init();
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/* handle options / config file */
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add_options();
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rc = options_config_file("~/.osmocom/analog/imts.conf", handle_options);
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if (rc < 0)
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return 0;
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argi = options_command_line(argc, argv, handle_options);
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if (argi <= 0)
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return argi;
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if (!station_length) {
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if (mode == MODE_IMTS)
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station_length = 7;
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else
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station_length = 5;
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}
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if (argi < argc) {
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station_id = argv[argi];
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if ((int)strlen(station_id) != station_length) {
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printf("Given station ID '%s' does not have %d digits\n", station_id, station_length);
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return 0;
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}
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}
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if (!num_kanal) {
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printf("No channel (\"Kanal\") is specified, Use '-k list' to get a list of all channels.\n\n");
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print_help(argv[0]);
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return 0;
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}
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if (!strcasecmp(kanal[0], "list")) {
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imts_list_channels();
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goto fail;
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}
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if (use_sdr) {
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/* set audiodev */
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for (i = 0; i < num_kanal; i++)
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audiodev[i] = "sdr";
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num_audiodev = num_kanal;
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}
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if (num_kanal == 1 && num_audiodev == 0)
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num_audiodev = 1; /* use default */
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if (num_kanal != num_audiodev) {
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fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
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exit(0);
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}
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/* SDR always requires emphasis */
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if (use_sdr) {
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do_pre_emphasis = 1;
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do_de_emphasis = 1;
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}
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if (!do_pre_emphasis || !do_de_emphasis) {
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fprintf(stderr, "*******************************************************************************\n");
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fprintf(stderr, "I suggest to let me do pre- and de-emphasis (options -p -d)!\n");
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fprintf(stderr, "Use a transmitter/receiver without emphasis and let me do that!\n");
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fprintf(stderr, "Because FSK signaling does not use emphasis, I like to control emphasis by\n");
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fprintf(stderr, "myself for best results.\n");
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fprintf(stderr, "*******************************************************************************\n");
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}
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if (mode == MODE_IMTS && !fast_seize && latency > 5 && loopback == 0) {
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fprintf(stderr, "*******************************************************************************\n");
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fprintf(stderr, "It is required to have a low latency in order to respond to phone's seizure\n");
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fprintf(stderr, "fast enough! Please reduce buffer size to 5 ms via option: '-b 5'\n");
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fprintf(stderr, "If this causes buffer underruns, use the 'Fast Seize' mode, see help.\n");
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fprintf(stderr, "*******************************************************************************\n");
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exit(0);
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}
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if (mode == MODE_MTS && !use_sdr && loopback == 0) {
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fprintf(stderr, "*******************************************************************************\n");
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fprintf(stderr, "MTS mode requires use of SDR, because base station is controlled by Squelch.\n");
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fprintf(stderr, "*******************************************************************************\n");
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exit(0);
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}
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if (mode == MODE_MTS && isinf(squelch_db) < 0 && loopback == 0) {
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fprintf(stderr, "*******************************************************************************\n");
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fprintf(stderr, "MTS mode requires use of Squelch. Please set Squelch level, see help.\n");
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fprintf(stderr, "*******************************************************************************\n");
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exit(0);
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}
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if (ptt && isinf(squelch_db) < 0 && loopback == 0) {
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fprintf(stderr, "*******************************************************************************\n");
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fprintf(stderr, "Cannot use push-to-talk feature without Squelch option.\n");
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fprintf(stderr, "*******************************************************************************\n");
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exit(0);
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}
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/* no squelch in loopback mode */
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if (loopback)
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squelch_db = -INFINITY;
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/* inits */
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fm_init(fast_math);
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dsp_init();
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imts_init();
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/* create transceiver instance */
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for (i = 0; i < num_kanal; i++) {
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rc = imts_create(kanal[i], audiodev[i], use_sdr, samplerate, rx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, ptt, station_length, fast_seize, mode, operator, detector_test_length_1, detector_test_length_2, detector_test_length_3);
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if (rc < 0) {
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fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
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goto fail;
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}
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printf("Base station on channel %s ready, please tune transmitter to %.3f MHz and receiver to %.3f MHz. (%.3f MHz offset)\n", kanal[i], imts_channel2freq(kanal[i], 0) / 1e6, imts_channel2freq(kanal[i], 1) / 1e6, imts_channel2freq(kanal[i], 2) / 1e6);
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}
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main_mobile(&quit, latency, interval, NULL, station_id, station_length);
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fail:
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/* destroy transceiver instance */
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while (sender_head)
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imts_destroy(sender_head);
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/* exits */
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fm_exit();
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return 0;
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}
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