An implementation of Analog cellular networks like A-Netz, B-Netz, C-Netz, NMT, AMPS, TACS, JTACS, Radiocom 2000, IMTS, MPT1327, Eurosignal and more http://osmocom-analog.eversberg.eu/
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
osmocom-analog/src/dcf77/main.c

513 lines
12 KiB

/* DCF77 main
*
* (C) 2022 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <termios.h>
#include <sched.h>
#include <time.h>
#include "../libdebug/debug.h"
#include "../liboptions/options.h"
#include "../libsample/sample.h"
#include "../libsound/sound.h"
#include "dcf77.h"
int num_kanal = 1;
dcf77_t *dcf77 = NULL;
static void *soundif = NULL;
static const char *dsp_device = "";
static int dsp_samplerate = 192000;
static int dsp_buffer = 50;
static int rx = 0, tx = 0;
static time_t timestamp = -1;
static int double_amplitude = 0;
static int test_tone = 0;
static int dsp_interval = 1; /* ms */
static int rt_prio = 1;
static int fast_math = 0;
/* not static, in case we add libtimer some day, then compiler hits an error */
double get_time(void)
{
static struct timespec tv;
clock_gettime(CLOCK_REALTIME, &tv);
return (double)tv.tv_sec + (double)tv.tv_nsec / 1000000000.0;
}
static time_t parse_time(char **argv)
{
time_t t;
struct tm *tm;
int val;
t = get_time();
tm = localtime(&t);
if (!tm)
return -1;
val = atoi(argv[0]);
if (val < 1900)
return -1;
tm->tm_year = val - 1900;
val = atoi(argv[1]);
if (val < 1 || val > 12)
return -1;
tm->tm_mon = val - 1;
val = atoi(argv[2]);
if (val < 1 || val > 31)
return -1;
tm->tm_mday = val;
val = atoi(argv[3]);
if (val < 0 || val > 23)
return -1;
tm->tm_hour = val;
val = atoi(argv[4]);
if (val < 0 || val > 59)
return -1;
tm->tm_min = val;
val = atoi(argv[5]);
if (val < 0 || val > 59)
return -1;
tm->tm_sec = val;
tm->tm_isdst = -1;
return mktime(tm);
}
static time_t feierabend_time()
{
time_t t;
struct tm *tm;
t = get_time();
tm = localtime(&t);
if (!tm)
return -1;
tm->tm_hour = 17;
tm->tm_min = 0;
tm->tm_sec = 0;
tm->tm_isdst = -1;
return mktime(tm);
}
static void print_usage(const char *app)
{
printf("Usage: %s [-a hw:0,0] [<options>]\n", app);
}
void print_help(void)
{
/* - - */
printf(" -h --help\n");
printf(" This help\n");
printf(" --config [~/]<path to config file>\n");
printf(" Give a config file to use. If it starts with '~/', path is at home dir.\n");
printf(" Each line in config file is one option, '-' or '--' must not be given!\n");
debug_print_help();
printf(" -a --audio-device hw:<card>,<device>\n");
printf(" Sound card and device number (default = '%s')\n", dsp_device);
printf(" -s --samplerate <rate>\n");
printf(" Sample rate of sound device (default = '%d')\n", dsp_samplerate);
printf(" -b --buffer <ms>\n");
printf(" How many milliseconds are processed in advance (default = '%d')\n", dsp_buffer);
printf(" A buffer below 10 ms requires low interval like 0.1 ms.\n");
printf(" -T --tx\n");
printf(" Transmit time signal (default)\n");
printf(" -R --rx\n");
printf(" Receive time signal\n");
printf(" -F --fake\n");
printf(" Use given time stamp: <year> <month> <day> <hour> <min< <sec>.\n");
printf(" All values have to be numerical. The year must have 4 digits.\n");
printf(" --feierabend\n");
printf(" --end-of-working-day\n");
printf(" Use fake time stamp that equals 5 O'Clock PM.\n");
printf(" --geburtstag\n");
printf(" --birthday\n");
printf(" Use fake time stamp that equals birth of the author.\n");
printf(" -D --double-amplitude\n");
printf(" Transmit with double amplitude by using differential stereo output.\n");
printf(" --test-tone\n");
printf(" Transmit a test tone (10%% level, 1000 Hz) with the carrier.\n");
printf(" -r --realtime <prio>\n");
printf(" Set prio: 0 to disable, 99 for maximum (default = %d)\n", rt_prio);
printf(" --fast-math\n");
printf(" Use fast math approximation for slow CPU / ARM based systems.\n");
printf("\n");
printf("Press 'w' key to toggle display of RX wave form.\n");
printf("Press 'm' key to toggle display of measurement values.\n");
}
#define OPT_F1 1001
#define OPT_F2 1002
#define OPT_G1 1003
#define OPT_G2 1004
#define OPT_TEST_TONE 1005
#define OPT_FAST_MATH 1006
static void add_options(void)
{
option_add('h', "help", 0);
option_add('v', "verbose", 1);
option_add('a', "audio-device", 1);
option_add('s', "samplerate", 1);
option_add('b', "buffer", 1);
option_add('T', "tx", 0);
option_add('R', "rx", 0);
option_add('F', "fake", 6);
option_add(OPT_F1, "feierabend", 0);
option_add(OPT_F2, "end-of-working-day", 0);
option_add(OPT_G1, "geburtstag", 0);
option_add(OPT_G2, "birthday", 0);
option_add(OPT_TEST_TONE, "test-tone", 0);
option_add('D', "double-amplitude", 0);
option_add('r', "realtime", 1);
option_add(OPT_FAST_MATH, "fast-math", 0);
}
static int handle_options(int short_option, int argi, char **argv)
{
int rc;
switch (short_option) {
case 'h':
print_usage(argv[0]);
print_help();
return 0;
case 'v':
if (!strcasecmp(argv[argi], "list")) {
debug_list_cat();
return 0;
}
rc = parse_debug_opt(argv[argi]);
if (rc < 0) {
fprintf(stderr, "Failed to parse debug option, please use -h for help.\n");
return rc;
}
break;
case 'a':
dsp_device = options_strdup(argv[argi]);
break;
case 's':
dsp_samplerate = atoi(argv[argi]);
break;
case 'b':
dsp_buffer = atoi(argv[argi]);
break;
case 'T':
tx = 1;
break;
case 'R':
rx = 1;
break;
case 'F':
timestamp = parse_time(argv + argi);
printf("%ld\n",timestamp);
if (timestamp < 0) {
fprintf(stderr, "Given time stamp is invalid, please use -h for help.\n");
return -EINVAL;
}
break;
case OPT_F1:
case OPT_F2:
timestamp = feierabend_time() - 70;
break;
case OPT_G1:
case OPT_G2:
timestamp = 115099200 - 70;
break;
case OPT_TEST_TONE:
test_tone = 1;
break;
case 'D':
double_amplitude = 1;
break;
case 'r':
rt_prio = atoi(argv[argi]);
break;
case OPT_FAST_MATH:
fast_math = 1;
break;
default:
return -EINVAL;
}
return 1;
}
static int quit = 0;
static void sighandler(int sigset)
{
if (sigset == SIGHUP || sigset == SIGPIPE)
return;
fprintf(stderr, "\nSignal %d received.\n", sigset);
quit = 1;
}
static int get_char()
{
struct timeval tv = {0, 0};
fd_set fds;
char c = 0;
int __attribute__((__unused__)) rc;
FD_ZERO(&fds);
FD_SET(0, &fds);
select(0+1, &fds, NULL, NULL, &tv);
if (FD_ISSET(0, &fds)) {
rc = read(0, &c, 1);
return c;
} else
return -1;
}
int soundif_open(const char *audiodev, int samplerate, int buffer_size)
{
if (!audiodev || !audiodev[0]) {
PDEBUG(DDSP, DEBUG_ERROR, "No audio device given!\n");
return -EINVAL;
}
/* open audiodev */
soundif = sound_open(audiodev, NULL, NULL, NULL, (double_amplitude) ? 2 : 1, 0.0, samplerate, buffer_size, 1.0, 1.0, 0.0, 2.0);
if (!soundif) {
PDEBUG(DDSP, DEBUG_ERROR, "Failed to open sound device!\n");
return -EIO;
}
return 0;
}
void soundif_start(void)
{
sound_start(soundif);
PDEBUG(DDSP, DEBUG_DEBUG, "Starting audio stream!\n");
}
void soundif_close(void)
{
/* close audiodev */
if (soundif) {
sound_close(soundif);
soundif = NULL;
}
}
void soundif_work(int buffer_size)
{
int count;
sample_t buff1[buffer_size], buff2[buffer_size], *samples[2] = { buff1, buff2 };
double rf_level_db[2];
int rc;
int i;
/* encode and write */
count = sound_get_tosend(soundif, buffer_size);
if (count < 0) {
PDEBUG(DDSP, DEBUG_ERROR, "Failed to get number of samples in buffer (rc = %d)!\n", count);
return;
}
if (count) {
dcf77_encode(dcf77, samples[0], count);
if (double_amplitude) {
for (i = 0; i < count; i++)
samples[1][i] = -samples[0][i];
}
rc = sound_write(soundif, samples, NULL, count, NULL, NULL, (double_amplitude) ? 2 : 1);
if (rc < 0) {
PDEBUG(DDSP, DEBUG_ERROR, "Failed to write TX data to audio device (rc = %d)\n", rc);
return;
}
}
/* read */
count = sound_read(soundif, samples, buffer_size, 1, rf_level_db);
if (count < 0) {
PDEBUG(DDSP, DEBUG_ERROR, "Failed to read from audio device (rc = %d)!\n", count);
return;
}
/* decode */
dcf77_decode(dcf77, samples[0], count);
}
int main(int argc, char *argv[])
{
int rc, argi;
int buffer_size;
struct termios term, term_orig;
double begin_time, now, sleep;
char c;
/* handle options / config file */
add_options();
rc = options_config_file(argc, argv, "~/.osmocom/dcf77/dcf77.conf", handle_options);
if (rc < 0)
return 0;
argi = options_command_line(argc, argv, handle_options);
if (argi <= 0)
return argi;
if (dsp_samplerate < 192000) {
fprintf(stderr, "The sample rate must be at least 192000 to TX or RX 77.5 kHz. Quitting!\n");
goto error;
}
/* default to TX, if --tx and --rx was not set */
if (!tx && !rx)
tx = 1;
/* inits */
dcf77_init(fast_math);
/* size of dsp buffer in samples */
buffer_size = dsp_samplerate * dsp_buffer / 1000;
rc = soundif_open(dsp_device, dsp_samplerate, buffer_size);
if (rc < 0) {
printf("Failed to open sound for DCF77, use '-h' for help.\n");
goto error;
}
dcf77 = dcf77_create(dsp_samplerate, tx, rx, test_tone);
if (!dcf77) {
fprintf(stderr, "Failed to create \"DCF77\" instance. Quitting!\n");
goto error;
}
printf("\n");
printf("DCF77 ready.\n");
/* prepare terminal */
tcgetattr(0, &term_orig);
term = term_orig;
term.c_lflag &= ~(ISIG|ICANON|ECHO);
term.c_cc[VMIN]=1;
term.c_cc[VTIME]=2;
tcsetattr(0, TCSANOW, &term);
/* set real time prio */
if (rt_prio) {
struct sched_param schedp;
memset(&schedp, 0, sizeof(schedp));
schedp.sched_priority = rt_prio;
rc = sched_setscheduler(0, SCHED_RR, &schedp);
if (rc)
fprintf(stderr, "Error setting SCHED_RR with prio %d\n", rt_prio);
}
signal(SIGINT, sighandler);
signal(SIGHUP, sighandler);
signal(SIGTERM, sighandler);
signal(SIGPIPE, sighandler);
soundif_start();
if (tx)
dcf77_tx_start(dcf77, timestamp);
while (!quit) {
int w;
begin_time = get_time();
soundif_work(buffer_size);
do {
w = 0;
} while (w);
c = get_char();
switch (c) {
case 3:
printf("CTRL+c received, quitting!\n");
quit = 1;
break;
case 'w':
/* toggle wave display */
display_measurements_on(0);
display_wave_on(-1);
break;
case 'm':
/* toggle measurements display */
display_wave_on(0);
display_measurements_on(-1);
break;
default:
break;
}
display_measurements(dsp_interval / 1000.0);
now = get_time();
/* sleep interval */
sleep = ((double)dsp_interval / 1000.0) - (now - begin_time);
if (sleep > 0)
usleep(sleep * 1000000.0);
}
signal(SIGINT, SIG_DFL);
signal(SIGTSTP, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
/* reset real time prio */
if (rt_prio > 0) {
struct sched_param schedp;
memset(&schedp, 0, sizeof(schedp));
schedp.sched_priority = 0;
sched_setscheduler(0, SCHED_OTHER, &schedp);
}
/* reset terminal */
tcsetattr(0, TCSANOW, &term_orig);
error:
/* destroy UK0 instances */
if (dcf77)
dcf77_destroy(dcf77);
soundif_close();
dcf77_exit();
options_free();
return 0;
}