Implementation of C-Netz (German mobile telephone system)
This commit is contained in:
Andreas Eversberg
250
src/cnetz/main.c
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250
src/cnetz/main.c
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/* C-Netz main
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*
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* (C) 2016 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 <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <sched.h>
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#include "../common/main.h"
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#include "../common/debug.h"
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#include "../common/timer.h"
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#include "../common/call.h"
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#include "../common/mncc_sock.h"
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#include "../common/freiton.h"
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#include "../common/besetztton.h"
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#include "cnetz.h"
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#include "sysinfo.h"
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#include "dsp.h"
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#include "telegramm.h"
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#include "image.h"
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#include "ansage.h"
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/* settings */
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int measure_speed = 0;
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double clock_speed[2] = { 0.0, 0.0 };
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int set_clock_speed = 0;
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double deviation = 0.5, noise = 0.0;
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int ms_power = 3; /* 0..3 */
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int auth = 0;
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void print_help(const char *arg0)
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{
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print_help_common(arg0, "");
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/* - - */
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printf(" -M --measure-speed\n");
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printf(" Measures clock speed. See documentation!\n");
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printf(" -S --clock-speed <rx ppm>,<tx ppm>\n");
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printf(" Correct speed of sound card's clock. Use '-M' to measure speed for\n");
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printf(" some hours after temperature has settled. The use these results to\n");
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printf(" correct signal processing speed. After adjustment, the clock must match\n");
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printf(" +- 1ppm or better. See documentation on how to measure correct value.\n");
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printf(" -F --flip-polarity\n");
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printf(" Adjust, so the transmitter increases frequency, when positive levels\n");
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printf(" are sent to sound device\n");
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printf(" -N --noise 0.0 .. 1.0 (default = %.1f)\n", noise);
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printf(" Between frames on OgK, send noise at given level. Use 0.0 for Silence.\n");
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printf(" -P --ms-power <power level>\n");
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printf(" Give power level of the mobile station 0..3. (default = '%d')\n", ms_power);
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printf(" 0 = 50-125 mW; 1 = 0.5-1 W; 2 = 4-8 W; 3 = 10-20 W\n");
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printf(" -A --authentication\n");
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printf(" Enable authentication on the base station. Since we cannot\n");
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printf(" authenticate, because we don't know the secret key and the algorithm,\n");
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printf(" we just accept any card. With this we get the vendor IDs of the phone.\n");
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}
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static int handle_options(int argc, char **argv)
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{
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int skip_args = 0;
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const char *p;
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static struct option long_options_special[] = {
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{"measure-speed", 0, 0, 'M'},
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{"clock-speed", 1, 0, 'S'},
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{"flip-polarity", 0, 0, 'F'},
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{"noise", 1, 0, 'N'},
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{"ms-power", 1, 0, 'P'},
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{"authentication", 0, 0, 'A'},
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{0, 0, 0, 0}
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};
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set_options_common("MS:FN:P:A", long_options_special);
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while (1) {
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int option_index = 0, c;
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c = getopt_long(argc, argv, optstring, long_options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 'M':
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measure_speed = 1;
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skip_args++;
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break;
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case 'S':
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p = strchr(optarg, ',');
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if (!p) {
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fprintf(stderr, "Illegal clock speed, use two values, seperated by comma and no spaces!\n");
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exit(0);
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}
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clock_speed[0] = strtold(optarg, NULL);
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clock_speed[1] = strtold(p + 1, NULL);
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set_clock_speed = 1;
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skip_args += 2;
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break;
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case 'F':
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deviation = -deviation;
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skip_args += 1;
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break;
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case 'N':
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noise = strtold(optarg, NULL);
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skip_args += 2;
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break;
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case 'P':
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ms_power = atoi(optarg);
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if (ms_power > 3)
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ms_power = 3;
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if (ms_power < 0)
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ms_power = 0;
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skip_args += 2;
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break;
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case 'A':
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auth = 1;
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skip_args += 1;
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break;
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default:
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opt_switch_common(c, argv[0], &skip_args);
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}
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}
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free(long_options);
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return skip_args;
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}
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int main(int argc, char *argv[])
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{
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int rc;
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int skip_args;
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const char *station_id = "";
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int mandatory = 0;
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/* init common tones */
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init_freiton();
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init_besetzton();
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init_ansage();
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skip_args = handle_options(argc, argv);
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argc -= skip_args;
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argv += skip_args;
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if (argc > 1) {
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}
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if (!kanal) {
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printf("No channel (\"Kanal\") is specified, I suggest channel %d.\n\n", CNETZ_OGK_KANAL);
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mandatory = 1;
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}
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if (!set_clock_speed && !measure_speed) {
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printf("No clock speed given. You need to measure clock using '-M' and later correct clock using '-S <rx ppm>,<tx ppm>'. See documentation for help!\n\n");
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mandatory = 1;
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}
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if (mandatory) {
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print_help(argv[0]);
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return 0;
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}
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if (!loopback)
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print_image();
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/* init functions */
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if (use_mncc_sock) {
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rc = mncc_init("/tmp/bsc_mncc");
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if (rc < 0) {
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fprintf(stderr, "Failed to setup MNCC socket. Quitting!\n");
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return -1;
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}
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}
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scrambler_init();
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init_sysinfo();
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dsp_init();
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init_telegramm();
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init_coding();
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cnetz_init();
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rc = call_init(station_id, call_sounddev, samplerate, latency, 7, loopback);
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if (rc < 0) {
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fprintf(stderr, "Failed to create call control instance. Quitting!\n");
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goto fail;
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}
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/* create transceiver instance */
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rc = cnetz_create(sounddev, samplerate, do_pre_emphasis, do_de_emphasis, write_wave, read_wave, kanal, auth, ms_power, measure_speed, clock_speed, deviation, noise, loopback);
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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 ready, please tune transmitter to %.3f MHz and receiver to %.3f MHz.\n", cnetz_kanal2freq(CNETZ_OGK_KANAL, 0), cnetz_kanal2freq(CNETZ_OGK_KANAL, 1));
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if (kanal != CNETZ_OGK_KANAL)
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printf("When switching to speech channel %d, be sure that transmitter switches to %.3f MHz and receiver to %.3f MHz. (using pilot signal)\n", kanal, cnetz_kanal2freq(kanal, 0), cnetz_kanal2freq(kanal, 1));
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signal(SIGINT,sighandler);
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signal(SIGHUP,sighandler);
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signal(SIGTERM,sighandler);
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signal(SIGPIPE,sighandler);
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if (rt_prio > 0) {
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struct sched_param schedp;
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int rc;
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memset(&schedp, 0, sizeof(schedp));
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schedp.sched_priority = rt_prio;
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rc = sched_setscheduler(0, SCHED_RR, &schedp);
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if (rc)
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fprintf(stderr, "Error setting SCHED_RR with prio %d\n", rt_prio);
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}
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main_loop(&quit, latency);
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if (rt_prio > 0) {
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struct sched_param schedp;
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memset(&schedp, 0, sizeof(schedp));
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schedp.sched_priority = 0;
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sched_setscheduler(0, SCHED_OTHER, &schedp);
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}
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fail:
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/* cleanup functions */
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call_cleanup();
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if (use_mncc_sock)
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mncc_exit();
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/* destroy transceiver instance */
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while (sender_head)
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cnetz_destroy(sender_head);
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return 0;
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}
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