Implementation of "Radiocom 2000", the analog French mobile network

pull/1/head
Andreas Eversberg 6 years ago
parent 8ce3ff455d
commit ffd3b848e1
  1. 1
      .gitignore
  2. 8
      README
  3. 1
      configure.ac
  4. 1
      docs/index.html
  5. 39
      docs/radiocom2000.html
  6. 2
      src/Makefile.am
  7. 1
      src/common/debug.c
  8. 21
      src/common/debug.h
  9. 21
      src/r2000/Makefile.am
  10. 618
      src/r2000/dsp.c
  11. 6
      src/r2000/dsp.h
  12. 573
      src/r2000/frame.c
  13. 33
      src/r2000/frame.h
  14. 84
      src/r2000/image.c
  15. 3
      src/r2000/image.h
  16. 397
      src/r2000/main.c
  17. 1589
      src/r2000/r2000.c
  18. 135
      src/r2000/r2000.h
  19. 68
      src/r2000/tones.c
  20. 3
      src/r2000/tones.h

1
.gitignore vendored

@ -28,6 +28,7 @@ src/nmt/nmt
src/amps/libamps.a
src/amps/amps
src/tacs/tacs
src/r2000/radiocom2000
sim/cnetz_sim
src/test/test_filter
src/test/test_compandor

@ -6,9 +6,10 @@ and from mobile phone. Currently supported networks:
* A-Netz
* B-Netz (ATF-1)
* C-Netz
* NMT 450 (Nordic Mobile Telephone)
* NMT 450 / 900 (Nordic Mobile Telephone)
* AMPS (Advanced Mobile Phone System)
* TACS (Total Access Communication System)
* Radiocom 2000 (French network)
USE AT YOUR OWN RISK!
@ -46,5 +47,8 @@ Association."
Eric from Smart Card World and Karsten Niehusen from cardomatic.de for
providing memory cards to be programmed for older C-Netz phone.
Dieter Spaar prividing TACS recordings to verify and debug TACS support.
Dieter Spaar providing TACS recordings to verify and debug TACS support.
Hans Wigger providing Radiocom 2000 recordings to reverse-enigeer the signalling
system.

@ -48,6 +48,7 @@ AC_OUTPUT(
src/nmt/Makefile
src/amps/Makefile
src/tacs/Makefile
src/r2000/Makefile
src/test/Makefile
src/Makefile
sim/Makefile

@ -77,6 +77,7 @@ Implemented networks:
<li><a href="nmt.html">NMT - Nordic Mobile Telephone</a> (Scandinavia)</li>
<li><a href="amps.html">AMPS - Advanced Mobile Phone Service</a> (USA)</li>
<li><a href="tacs.html">TACS - Total Access Communication System</a> (UK/Italy)</li>
<li><a href="radiocom2000.html">Radiocom 2000</a> (France)</li>
</ul>
</center>

@ -0,0 +1,39 @@
<html>
<head>
<link href="style.css" rel="stylesheet" type="text/css" />
<title>osmocom-analog</title>
</head>
<body>
<center><table><tr><td>
<h2><center>Radiocom 2000</center></h2>
<center><img src="radiocom2000.jpg"/></center>
<center><h1>*this doc is under construction*</h1></center>
<ul>
<li><a href="#history">History</a>
<li><a href="#howitworks">How it works</a>
<li><a href="#basestation">Setup of a base station</a>
</ul>
<p class="toppic">
<a name="history"></a>
History
</p>
<p class="toppic">
<a name="howitworks"></a>
How it works
</p>
<p class="toppic">
<a name="basestation"></a>
Setup of a base station
</p>
<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
</td></tr></table></center>
</body>
</html>

@ -1,3 +1,3 @@
AUTOMAKE_OPTIONS = foreign
SUBDIRS = common anetz bnetz cnetz nmt amps tacs test
SUBDIRS = common anetz bnetz cnetz nmt amps tacs r2000 test

@ -49,6 +49,7 @@ struct debug_cat {
{ "cnetz", "\033[1;34m" },
{ "nmt", "\033[1;34m" },
{ "amps", "\033[1;34m" },
{ "r2000", "\033[1;34m" },
{ "frame", "\033[0;36m" },
{ "call", "\033[1;37m" },
{ "mncc", "\033[1;32m" },

@ -12,16 +12,17 @@
#define DCNETZ 5
#define DNMT 6
#define DAMPS 7
#define DFRAME 8
#define DCALL 9
#define DMNCC 10
#define DDB 11
#define DTRANS 12
#define DDMS 13
#define DSMS 14
#define DSDR 15
#define DUHD 16
#define DSOAPY 17
#define DR2000 8
#define DFRAME 9
#define DCALL 10
#define DMNCC 11
#define DDB 12
#define DTRANS 13
#define DDMS 14
#define DSMS 15
#define DSDR 16
#define DUHD 17
#define DSOAPY 18
#define PDEBUG(cat, level, fmt, arg...) _printdebug(__FILE__, __FUNCTION__, __LINE__, cat, level, -1, fmt, ## arg)
#define PDEBUG_CHAN(cat, level, fmt, arg...) _printdebug(__FILE__, __FUNCTION__, __LINE__, cat, level, CHAN, fmt, ## arg)

@ -0,0 +1,21 @@
#AUTOMAKE_OPTIONS = subdir-objects
AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
bin_PROGRAMS = \
radiocom2000
radiocom2000_SOURCES = \
r2000.c \
dsp.c \
frame.c \
tones.c \
image.c \
main.c
radiocom2000_LDADD = \
$(COMMON_LA) \
$(top_builddir)/src/common/libcommon.a \
$(ALSA_LIBS) \
$(UHD_LIBS) \
$(SOAPY_LIBS) \
-lm

@ -0,0 +1,618 @@
/* Radiocom 2000 audio processing
*
* (C) 2017 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/>.
*/
#define CHAN r2000->sender.kanal
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include "../common/sample.h"
#include "../common/debug.h"
#include "../common/timer.h"
#include "r2000.h"
#include "dsp.h"
#define PI M_PI
/* Notes on TX_PEAK_FSK level:
*
* Applies similar to NMT, read it there!
*
* I assume that the deviation at 1800 Hz (Bit 0) is +-1700 Hz.
*
* Notes on TX_PEAK_SUPER level:
*
* No emphasis applies (done afterwards), so it is 300 Hz deviation.
*/
/* signaling */
#define MAX_DEVIATION 2500.0
#define MAX_MODULATION 2550.0
#define DBM0_DEVIATION 1500.0 /* deviation of dBm0 at 1 kHz */
#define COMPANDOR_0DB 1.0 /* A level of 0dBm (1.0) shall be unaccected */
#define TX_PEAK_FSK (1700.0 / 1800.0 * 1000.0 / DBM0_DEVIATION) /* with emphasis */
#define TX_PEAK_SUPER (300.0 / DBM0_DEVIATION) /* no emphasis */
#define BIT_RATE 1200.0
#define SUPER_RATE 50.0
#define FILTER_STEP 0.002 /* step every 2 ms */
#define MAX_DISPLAY 1.4 /* something above dBm0 */
/* two signaling tones */
static double super_bits[2] = {
136.0,
164.0,
};
/* table for fast sine generation */
static sample_t super_sine[65536];
/* global init for FFSK */
void dsp_init(void)
{
int i;
ffsk_global_init(TX_PEAK_FSK);
PDEBUG(DDSP, DEBUG_DEBUG, "Generating sine table.\n");
for (i = 0; i < 65536; i++) {
super_sine[i] = sin((double)i / 65536.0 * 2.0 * PI) * TX_PEAK_SUPER;
}
}
static void fsk_receive_bit(void *inst, int bit, double quality, double level);
/* Init FSK of transceiver */
int dsp_init_sender(r2000_t *r2000)
{
sample_t *spl;
double fsk_samples_per_bit;
int i;
/* attack (3ms) and recovery time (13.5ms) according to NMT specs */
init_compandor(&r2000->cstate, 8000, 3.0, 13.5, COMPANDOR_0DB);
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Init DSP for Transceiver.\n");
/* set modulation parameters */
sender_set_fm(&r2000->sender, MAX_DEVIATION, MAX_MODULATION, DBM0_DEVIATION, MAX_DISPLAY);
PDEBUG(DDSP, DEBUG_DEBUG, "Using FSK level of %.3f\n", TX_PEAK_FSK);
/* init ffsk */
if (ffsk_init(&r2000->ffsk, r2000, fsk_receive_bit, r2000->sender.kanal, r2000->sender.samplerate) < 0) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "FFSK init failed!\n");
return -EINVAL;
}
if (r2000->sender.loopback)
r2000->rx_max = 176;
else
r2000->rx_max = 144;
/* allocate transmit buffer for a complete frame, add 10 to be safe */
fsk_samples_per_bit = (double)r2000->sender.samplerate / BIT_RATE;
r2000->frame_size = 208.0 * fsk_samples_per_bit + 10;
spl = calloc(r2000->frame_size, sizeof(*spl));
if (!spl) {
PDEBUG(DDSP, DEBUG_ERROR, "No memory!\n");
return -ENOMEM;
}
r2000->frame_spl = spl;
/* strange: better quality with window size of two bits */
r2000->super_samples_per_window = (double)r2000->sender.samplerate / SUPER_RATE * 2.0;
r2000->super_filter_step = (double)r2000->sender.samplerate * FILTER_STEP;
r2000->super_size = 20.0 * r2000->super_samples_per_window + 10;
PDEBUG(DDSP, DEBUG_DEBUG, "Using %d samples per filter step for supervisory signal.\n", r2000->super_filter_step);
spl = calloc(r2000->super_size, sizeof(*spl));
if (!spl) {
PDEBUG(DDSP, DEBUG_ERROR, "No memory!\n");
return -ENOMEM;
}
r2000->super_spl = spl;
spl = calloc(1, r2000->super_samples_per_window * sizeof(*spl));
if (!spl) {
PDEBUG(DDSP, DEBUG_ERROR, "No memory!\n");
return -ENOMEM;
}
r2000->super_filter_spl = spl;
r2000->super_filter_bit = -1;
/* count supervisory symbols */
for (i = 0; i < 2; i++) {
audio_goertzel_init(&r2000->super_goertzel[i], super_bits[i], r2000->sender.samplerate);
r2000->super_phaseshift65536[i] = 65536.0 / ((double)r2000->sender.samplerate / super_bits[i]);
PDEBUG(DDSP, DEBUG_DEBUG, "phaseshift[%d] = %.4f\n", i, r2000->super_phaseshift65536[i]);
}
r2000->super_bittime = SUPER_RATE / (double)r2000->sender.samplerate;
return 0;
}
/* Cleanup transceiver instance. */
void dsp_cleanup_sender(r2000_t *r2000)
{
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Cleanup DSP for Transceiver.\n");
ffsk_cleanup(&r2000->ffsk);
if (r2000->frame_spl) {
free(r2000->frame_spl);
r2000->frame_spl = NULL;
}
if (r2000->super_spl) {
free(r2000->super_spl);
r2000->super_spl = NULL;
}
if (r2000->super_filter_spl) {
free(r2000->super_filter_spl);
r2000->super_filter_spl = NULL;
}
}
/* Check for SYNC bits, then collect data bits */
static void fsk_receive_bit(void *inst, int bit, double quality, double level)
{
r2000_t *r2000 = (r2000_t *)inst;
// uint64_t frames_elapsed;
int i;
/* normalize FSK level */
level /= TX_PEAK_FSK;
r2000->rx_bits_count++;
// printf("bit=%d quality=%.4f\n", bit, quality);
if (!r2000->rx_in_sync) {
r2000->rx_sync = (r2000->rx_sync << 1) | bit;
/* level and quality */
r2000->rx_level[r2000->rx_count & 0xff] = level;
r2000->rx_quality[r2000->rx_count & 0xff] = quality;
r2000->rx_count++;
/* check if pattern 1010111100010010 matches */
if (r2000->rx_sync != 0xaf12)
return;
/* average level and quality */
level = quality = 0;
for (i = 0; i < 16; i++) {
level += r2000->rx_level[(r2000->rx_count - 1 - i) & 0xff];
quality += r2000->rx_quality[(r2000->rx_count - 1 - i) & 0xff];
}
level /= 16.0; quality /= 16.0;
// printf("sync (level = %.2f, quality = %.2f\n", level, quality);
/* do not accept garbage */
if (quality < 0.65)
return;
/* sync time */
r2000->rx_bits_count_last = r2000->rx_bits_count_current;
r2000->rx_bits_count_current = r2000->rx_bits_count - 32.0;
/* rest sync register */
r2000->rx_sync = 0;
r2000->rx_in_sync = 1;
r2000->rx_count = 0;
return;
}
/* read bits */
r2000->rx_frame[r2000->rx_count] = bit + '0';
r2000->rx_level[r2000->rx_count] = level;
r2000->rx_quality[r2000->rx_count] = quality;
if (++r2000->rx_count != r2000->rx_max)
return;
/* end of frame */
r2000->rx_frame[r2000->rx_max] = '\0';
r2000->rx_in_sync = 0;
/* average level and quality */
level = quality = 0;
for (i = 0; i < r2000->rx_max; i++) {
level += r2000->rx_level[i];
quality += r2000->rx_quality[i];
}
level /= (double)r2000->rx_max; quality /= (double)r2000->rx_max;
/* send frame to upper layer */
r2000_receive_frame(r2000, r2000->rx_frame, quality, level);
}
static void super_receive_bit(r2000_t *r2000, int bit, double level, double quality)
{
int i;
/* normalize supervisory level */
level /= TX_PEAK_SUPER;
/* store bit */
r2000->super_rx_word = (r2000->super_rx_word << 1) | bit;
r2000->super_rx_level[r2000->super_rx_index] = level;
r2000->super_rx_quality[r2000->super_rx_index] = quality;
r2000->super_rx_index = (r2000->super_rx_index + 1) % 20;
// printf("%d -> %05x\n", bit, r2000->super_rx_word & 0xfffff);
/* check for sync 0100000000 01xxxxxxx1 */
if ((r2000->super_rx_word & 0xfff01) != 0x40101)
return;
/* average level and quality */
level = quality = 0;
for (i = 0; i < 20; i++) {
level += r2000->super_rx_level[i];
quality += r2000->super_rx_quality[i];
}
level /= 20.0; quality /= 20.0;
/* send received supervisory digit to call control */
r2000_receive_super(r2000, (r2000->super_rx_word >> 1) & 0x7f, quality, level);
}
//#define DEBUG_FILTER
//#define DEBUG_QUALITY
/* demodulate supervisory signal
* filter one chunk, that is 2ms long (1/10th of a bit) */
static inline void super_decode_step(r2000_t *r2000, int pos)
{
double level, result[2], softbit, quality;
int max;
sample_t *spl;
int bit;
max = r2000->super_samples_per_window;
spl = r2000->super_filter_spl;
level = audio_level(spl, max);
audio_goertzel(r2000->super_goertzel, spl, max, pos, result, 2);
/* calculate soft bit from both frequencies */
softbit = (result[1] / level - result[0] / level + 1.0) / 2.0;
// /* scale it, since both filters overlap by some percent */
//#define MIN_QUALITY 0.08
// softbit = (softbit - MIN_QUALITY) / (0.850 - MIN_QUALITY - MIN_QUALITY);
if (softbit > 1)
softbit = 1;
if (softbit < 0)
softbit = 0;
#ifdef DEBUG_FILTER
printf("|%s", debug_amplitude(result[0]/level));
printf("|%s| low=%.3f high=%.3f level=%d\n", debug_amplitude(result[1]/level), result[0]/level, result[1]/level, (int)level);
#endif
if (softbit > 0.5)
bit = 1;
else
bit = 0;
// quality = result[bit] / level;
if (softbit > 0.5)
quality = softbit * 2.0 - 1.0;
else
quality = 1.0 - softbit * 2.0;
/* scale quality, because filters overlap */
quality /= 0.80;
if (r2000->super_filter_bit != bit) {
#ifdef DEBUG_FILTER
puts("bit change");
#endif
r2000->super_filter_bit = bit;
#if 0
/* If we have a bit change, move sample counter towards one half bit duration.
* We may have noise, so the bit change may be wrong or not at the correct place.
* This can cause bit slips.
* Therefore we change the sample counter only slightly, so bit slips may not
* happen so quickly.
*/
if (r2000->super_filter_sample < 5)
r2000->super_filter_sample++;
if (r2000->super_filter_sample > 5)
r2000->super_filter_sample--;
#else
/* directly center the sample position, because we don't have any sync sequence */
r2000->super_filter_sample = 5;
#endif
} else if (--r2000->super_filter_sample == 0) {
/* if sample counter bit reaches 0, we reset sample counter to one bit duration */
#ifdef DEBUG_QUALITY
printf("|%s| quality=%.2f ", debug_amplitude(softbit), quality);
printf("|%s|\n", debug_amplitude(quality);
#endif
/* adjust level, so we get peak of sine curve */
super_receive_bit(r2000, bit, level / 0.63662, quality);
r2000->super_filter_sample = 10;
}
}
/* get audio chunk out of received stream */
void super_receive(r2000_t *r2000, sample_t *samples, int length)
{
sample_t *spl;
int max, pos, step;
int i;
/* write received samples to decode buffer */
max = r2000->super_samples_per_window;
pos = r2000->super_filter_pos;
step = r2000->super_filter_step;
spl = r2000->super_filter_spl;
for (i = 0; i < length; i++) {
spl[pos++] = samples[i];
if (pos == max)
pos = 0;
/* if filter step has been reched */
if (!(pos % step)) {
super_decode_step(r2000, pos);
}
}
r2000->super_filter_pos = pos;
}
/* Process received audio stream from radio unit. */
void sender_receive(sender_t *sender, sample_t *samples, int length)
{
r2000_t *r2000 = (r2000_t *) sender;
sample_t *spl;
int pos;
int i;
/* do dc filter */
if (r2000->de_emphasis)
dc_filter(&r2000->estate, samples, length);
/* supervisory signal */
if (r2000->dsp_mode == DSP_MODE_AUDIO_TX
|| r2000->dsp_mode == DSP_MODE_AUDIO_TX_RX
|| r2000->sender.loopback)
super_receive(r2000, samples, length);
/* do de-emphasis */
if (r2000->de_emphasis)
de_emphasis(&r2000->estate, samples, length);
/* fsk signal */
ffsk_receive(&r2000->ffsk, samples, length);
/* we must have audio mode for both ways and a call */
if (r2000->dsp_mode == DSP_MODE_AUDIO_TX_RX
&& r2000->callref) {
int count;
count = samplerate_downsample(&r2000->sender.srstate, samples, length);
#if 0
/* compandor only in direction REL->MS */
if (r2000->compandor)
expand_audio(&r2000->cstate, samples, count);
#endif
spl = r2000->sender.rxbuf;
pos = r2000->sender.rxbuf_pos;
for (i = 0; i < count; i++) {
spl[pos++] = samples[i];
if (pos == 160) {
call_tx_audio(r2000->callref, spl, 160);
pos = 0;
}
}
r2000->sender.rxbuf_pos = pos;
} else
r2000->sender.rxbuf_pos = 0;
}
static int fsk_frame(r2000_t *r2000, sample_t *samples, int length)
{
const char *frame;
sample_t *spl;
int i;
int count, max;
next_frame:
if (!r2000->frame_length) {
/* request frame */
frame = r2000_get_frame(r2000);
if (!frame) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Stop sending frames.\n");
return length;
}
/* render frame */
r2000->frame_length = ffsk_render_frame(&r2000->ffsk, frame, 208, r2000->frame_spl);
r2000->frame_pos = 0;
if (r2000->frame_length > r2000->frame_size) {
PDEBUG_CHAN(DDSP, DEBUG_ERROR, "Frame exceeds buffer, please fix!\n");
abort();
}
}
/* send audio from frame */
max = r2000->frame_length;
count = max - r2000->frame_pos;
if (count > length)
count = length;
spl = r2000->frame_spl + r2000->frame_pos;
for (i = 0; i < count; i++) {
*samples++ = *spl++;
}
length -= count;
r2000->frame_pos += count;
/* check for end of telegramm */
if (r2000->frame_pos == max) {
r2000->frame_length = 0;
/* we need more ? */
if (length)
goto next_frame;
}
return length;
}
static int super_render_frame(r2000_t *r2000, uint32_t word, sample_t *sample)
{
double phaseshift, phase, bittime, bitpos;
int count = 0, i;
phase = r2000->super_phase65536;
bittime = r2000->super_bittime;
bitpos = r2000->super_bitpos;
for (i = 0; i < 20; i++) {
phaseshift = r2000->super_phaseshift65536[(word >> 19) & 1];
do {
*sample++ = super_sine[(uint16_t)phase];
count++;
phase += phaseshift;
if (phase >= 65536.0)
phase -= 65536.0;
bitpos += bittime;
} while (bitpos < 1.0);
bitpos -= 1.0;
word <<= 1;
}
r2000->super_phase65536 = phase;
bitpos = r2000->super_bitpos;
/* return number of samples created for frame */
return count;
}
static int super_frame(r2000_t *r2000, sample_t *samples, int length)
{
sample_t *spl;
int i;
int count, max;
next_frame:
if (!r2000->super_length) {
/* render supervisory rame */
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "render word 0x%05x\n", r2000->super_tx_word);
r2000->super_length = super_render_frame(r2000, r2000->super_tx_word, r2000->super_spl);
r2000->super_pos = 0;
if (r2000->super_length > r2000->super_size) {
PDEBUG_CHAN(DDSP, DEBUG_ERROR, "Frame exceeds buffer, please fix!\n");
abort();
}
}
/* send audio from frame */
max = r2000->super_length;
count = max - r2000->super_pos;
if (count > length)
count = length;
spl = r2000->super_spl + r2000->super_pos;
for (i = 0; i < count; i++) {
*samples++ += *spl++;
}
length -= count;
r2000->super_pos += count;
/* check for end of telegramm */
if (r2000->super_pos == max) {
r2000->super_length = 0;
/* we need more ? */
if (length)
goto next_frame;
}
return length;
}
/* Provide stream of audio toward radio unit */
void sender_send(sender_t *sender, sample_t *samples, int length)
{
r2000_t *r2000 = (r2000_t *) sender;
int len;
again:
switch (r2000->dsp_mode) {
case DSP_MODE_OFF:
memset(samples, 0, sizeof(*samples) * length);
break;
case DSP_MODE_AUDIO_TX:
case DSP_MODE_AUDIO_TX_RX:
jitter_load(&r2000->sender.dejitter, samples, length);
/* do pre-emphasis */
if (r2000->pre_emphasis)
pre_emphasis(&r2000->estate, samples, length);
super_frame(r2000, samples, length);
break;
case DSP_MODE_FRAME:
/* Encode frame into audio stream. If frames have
* stopped, process again for rest of stream. */
len = fsk_frame(r2000, samples, length);
/* do pre-emphasis */
if (r2000->pre_emphasis)
pre_emphasis(&r2000->estate, samples, length - len);
if (len) {
samples += length - len;
length = len;
goto again;
}
break;
}
}
const char *r2000_dsp_mode_name(enum dsp_mode mode)
{
static char invalid[16];
switch (mode) {
case DSP_MODE_OFF:
return "OFF";
case DSP_MODE_AUDIO_TX:
return "AUDIO-TX";
case DSP_MODE_AUDIO_TX_RX:
return "AUDIO-TX-RX";
case DSP_MODE_FRAME:
return "FRAME";
}
sprintf(invalid, "invalid(%d)", mode);
return invalid;
}
void r2000_set_dsp_mode(r2000_t *r2000, enum dsp_mode mode, int super)
{
/* reset telegramm */
if (mode == DSP_MODE_FRAME && r2000->dsp_mode != mode) {
r2000->frame_length = 0;
}
if ((mode == DSP_MODE_AUDIO_TX || mode == DSP_MODE_AUDIO_TX_RX)
&& (r2000->dsp_mode != DSP_MODE_AUDIO_TX && r2000->dsp_mode != DSP_MODE_AUDIO_TX_RX)) {
r2000->super_length = 0;
}
if (super >= 0) {
/* encode supervisory word 0100000000 01xxxxxxx1 */
r2000->super_tx_word = 0x40101 | ((super & 0x7f) << 1);
/* clear pending data in rx word */
r2000->super_rx_word = 0x00000;
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "DSP mode %s -> %s (super = 0x%05x)\n", r2000_dsp_mode_name(r2000->dsp_mode), r2000_dsp_mode_name(mode), r2000->super_tx_word);
} else if (r2000->dsp_mode != mode)
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "DSP mode %s -> %s\n", r2000_dsp_mode_name(r2000->dsp_mode), r2000_dsp_mode_name(mode));
r2000->dsp_mode = mode;
}
#warning fixme: high pass filter on tx side to prevent desturbance of supervisory signal

@ -0,0 +1,6 @@
void dsp_init(void);
int dsp_init_sender(r2000_t *r2000);
void dsp_cleanup_sender(r2000_t *r2000);
void r2000_set_dsp_mode(r2000_t *r2000, enum dsp_mode mode, int super);

<
@ -0,0 +1,573 @@
/* Radiocom 2000 frame transcoding
*
* (C) 2017 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 <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <inttypes.h>
#include "../common/hagelbarger.h"
#include "../common/debug.h"
#include "frame.h"
static const char *param_hex(uint64_t value)
{
static char result[32];
sprintf(result, "0x%" PRIx64, value);
return result;
}
static const char *param_voie_rel(uint64_t value)
{
return (value) ? "Control Channel" : "Traffic Channel";
}
static const char *param_voie_sm(uint64_t value)
{
return (value) ? "Traffic Channel" : "Control Channel";
}
const char *param_agi(uint64_t value)
{
switch (value) {
case 0:
return "Prohibited control channel (no mobile allowed)";
case 1:
return "New registration prohibited (registered mobiles allowed)";
case 2:
return "Registration is reserved to test mobiles";
case 3:
return "Registration for nominal mobiles (home network)";
case 4:
return "Registration is reserved to special mobiles";
case 5:
case 6:
case 7:
return "Registration permissible for all mobile station";
}
return "<invalid>";
}
const char *param_aga(uint64_t value)
{
switch (value) {
case 0:
return "Outgoing calls prohibited";
case 1:
return "Reserved (Outgoing calls prohibited)";
case 2:
return "Outgoing call reserved for privileged mobiles";
case 3:
return "Outgoing calls permissible";
}
return "<invalid>";
}
const char *param_power(uint64_t value)
{
switch (value) {
case 0:
return "Low";
case 1:
return "High";
}
return "<invalid>";
}
const char *param_crins(uint64_t value)
{
switch (value) {
case 0:
return "Finished or just registering";
case 1:
return "Localization impossible (queue full)";
case 2:
return "Mobile station temporarily disabled";
case 3:
return "Mobile station definitely disabled (WILL BRICK THE PHONE!)";
case 4:
return "Blocked localization (BS out of order)";
case 5:
case 6:
return "Reserved";
case 7:
return "Calling subscriber unknown";
}
return "<invalid>";
}
const char *param_invitation(uint64_t value)
{
switch (value) {
case 3:
return "to Answer";
case 10:
return "to Dial";
}
return "<unknown>";
}
static const char *param_digit(uint64_t value)
{
static char result[32];
switch (value) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
sprintf(result, "'%c'", (int)value + '0');
return result;
case 10:
return "'*'";
case 11:
return "'#'";
case 12:
return "'A'";
case 13:
return "'B'";
case 14:
return "'C'";
case 15:
return "'D'";
}
return "<invalid>";
}
static struct r2000_element {
char element;
const char *name;
const char *(*decoder_rel)(uint64_t value); /* REL sends to SM */
const char *(*decoder_sm)(uint64_t value); /* SM sends to REL */
} r2000_element[] = {
{ 'V', "Channel Type", param_voie_rel, param_voie_sm },
{ 'C', "Channel", NULL, NULL },
{ 'R', "Relais", NULL, NULL },
{ 'M', "Message", NULL, NULL },
{ 'D', "Deport", NULL, NULL },
{ 'I', "AGI", param_agi, param_agi },
// { 'A', "AGA", param_aga, param_aga },
{ 'P', "power", param_power, param_power },
{ 'T', "taxe", NULL, NULL },
{ 't', "SM Type", param_hex, param_hex },
{ 'r', "SM Relais", NULL, NULL },
{ 'f', "SM Flotte", NULL, NULL },
{ 'm', "SM ID", NULL, NULL },
{ 'd', "Called ID", NULL, NULL },
{ 'c', "CRINS", param_crins, param_crins },
{ 'a', "Assign Channel", NULL, NULL },
{ 's', "Sequence Number", param_hex, param_hex },
{ 'i', "Invitation", param_invitation,param_invitation },
{ 'n', "NCONV", NULL, NULL },
{ '0', "1st Digit", param_digit, param_digit },
{ '1', "2nd Digit", param_digit, param_digit },
{ '2', "3rd Digit", param_digit, param_digit },
{ '3', "4th Digit", param_digit, param_digit },
{ '4', "5th Digit", param_digit, param_digit },
{ '5', "6th Digit", param_digit, param_digit },
{ '6', "7th Digit", param_digit, param_digit },
{ '7', "8th Digit", param_digit, param_digit },
{ '8', "9th Digit", param_digit, param_digit },
{ '9', "10th Digit", param_digit, param_digit },
{ '?', "Unknown", param_hex, param_hex },
{ 0, NULL, NULL, NULL }
};
static void print_element(char element, uint64_t value, int dir, int debug)
{
const char *(*decoder)(uint64_t value);
int i;
for (i = 0; r2000_element[i].element; i++) {
if (r2000_element[i].element == element)
break;
}
decoder = (dir == REL_TO_SM) ? r2000_element[i].decoder_rel : r2000_element[i].decoder_sm;
if (!r2000_element[i].element)
PDEBUG(DFRAME, debug, "Element '%c' %" PRIu64 " [Unknown]\n", element, value);
else if (!decoder)
PDEBUG(DFRAME, debug, "Element '%c' %" PRIu64 " [%s]\n", element, value, r2000_element[i].name);
else
PDEBUG(DFRAME, debug, "Element '%c' %" PRIu64 "=%s [%s]\n", element, value, decoder(value), r2000_element[i].name);
}
static void store_element(frame_t *frame, char element, uint64_t value)
{
switch(element) {
case 'V':
frame->voie = value;
break;
case 'C':
frame->channel = value;
break;
case 'R':
frame->relais = value;
break;
case 'M':
frame->message = value;
break;
case 'D':
frame->deport = value;
break;
case 'I':
frame->agi = value;
break;
case 'P':
frame->sm_power = value;
break;
case 'T':
frame->taxe = value;
break;
case 't':
frame->sm_type = value;
break;
case 'r':
frame->sm_relais = value;
break;
case 'f':
frame->sm_flotte = value;
break;
case 'm':
frame->sm_mor = value;
break;
case 'd':
frame->sm_mop_demandee = value;
break;
case 'c':
frame->crins = value;
break;
case 'a':
frame->chan_assign = value;
break;
case 's':
frame->sequence = value;
break;
case 'i':
frame->invitation = value;
break;
case 'n':
frame->nconv = value;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
frame->digit[element - '0'] = value;
break;
}
}
static uint64_t fetch_element(frame_t *frame, char element)
{
switch(element) {
case 'V':
return frame->voie;
case 'C':
return frame->channel;
case 'R':
return frame->relais;
case 'M':
return frame->message;
case 'D':
return frame->deport;
case 'I':
return frame->agi;
case 'P':
return frame->sm_power;
case 'T':
return frame->taxe;
case 't':
return frame->sm_type;
case 'r':
return frame->sm_relais;
case 'f':
return frame->sm_flotte;
case 'm':
return frame->sm_mor;
case 'd':
return frame->sm_mop_demandee;
case 'c':
return frame->crins;
case 'a':
return frame->chan_assign;
case 's':
return frame->sequence;
case 'i':
return frame->invitation;
case 'n':
return frame->nconv;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return frame->digit[element - '0'];
}
return 0;
}
static struct r2000_frame {
int dir;
uint8_t message;
const char *def;
const char *name;
} r2000_frame_def[] = {
/* V Channel-Relais---Msg--t--HomeRel--MobieID--------- Supervisory----- */
/* messages REL->SM */
{ REL_TO_SM, 0, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm-----ccc----DDDIII++---PT---", "INSCRIPTION ACK" }, /* inscription ack */
{ REL_TO_SM, 2, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm------------DDDIII++---PT---", "PLEASE WAIT" }, /* waiting on CC */
{ REL_TO_SM, 1, "V-CCCCCCCCRRRRRRRRRMMMMM----------------------------------------DDDIII++---PT---", "IDLE" }, /* broadcast */
{ REL_TO_SM, 3, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmmaaaaaaaa----DDDIII++---PT---", "ASSIGN INCOMING"}, /* assign incoming call */
{ REL_TO_SM, 4, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrfffffffffmmmmmmmaaaaaaaa----DDDIII++---PT---", "ASSIGN GROUP"}, /* assign groupp call */
{ REL_TO_SM, 5, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmmaaaaaaaa----DDDIII++---PT---", "ASSIGN OUTGOING"}, /* assign outgoing call */
{ REL_TO_SM, 9, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm------------DDDIII++---PT---", "RELEASE ON CC" }, /* release call on CC */
{ REL_TO_SM, 16, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm----------------------------", "IDENTITY REQ"}, /* request identity */
{ REL_TO_SM, 17, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm-----nnniiii----------------", "INVITATION"}, /* invitation */
{ REL_TO_SM, 24, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm----------------------------", "RELEASE ON TC"}, /* release call */
{ REL_TO_SM, 26, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm----------------------------", "SUSPEND REQ"}, /* suspend after dialing */
/* messages SM->REL */
{ SM_TO_REL, 0, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm--------ssss", "INSCRIPTION REQ" }, /* inscription */
{ SM_TO_REL, 1, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm--------ssss", "CALL REQ (PRIVATE)" }, /* request call */
{ SM_TO_REL, 1, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrfffffffffmmmmmmmddddddddssss", "CALL REQ (GROUP)" }, /* request call */
{ SM_TO_REL, 3, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm--------ssss", "CALL REQ (PUBLIC)" }, /* request call */
{ SM_TO_REL, 6, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm------------", "RELEASE ON CC" }, /* release on CC */
{ SM_TO_REL, 16, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm--------ssss", "IDENTITY ACK" }, /* identity response */
{ SM_TO_REL, 17, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm------------", "ANSWER" }, /* answer */
{ SM_TO_REL, 19, "V-CCCCCCCCRRRRRRRRRMMMMM1111000033332222555544447777666699998888", "DIAL 1..10" }, /* first 10 digits */
{ SM_TO_REL, 20, "V-CCCCCCCCRRRRRRRRRMMMMM1111000033332222555544447777666699998888", "DIAL 11..20" }, /* second 10 digits */
{ SM_TO_REL, 24, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm------------", "RELEASE ON TC" }, /* release call on TC */
{ SM_TO_REL, 26, "V-CCCCCCCCRRRRRRRRRMMMMMtttrrrrrrrrrmmmmmmmmmmmmmmmm------------", "SUSPEND ACK" }, /* release after dialing */
{ 0, 0, NULL, NULL }
};
static const char *get_frame_def(uint8_t message, int dir)
{
int i;
for (i = 0; r2000_frame_def[i].def; i++) {
if (r2000_frame_def[i].message == message && r2000_frame_def[i].dir == dir)
return r2000_frame_def[i].def;
}
return NULL;
}
const char *r2000_dir_name(int dir)
{
return (dir == REL_TO_SM) ? "REL->SM" : "SM->REL";
}
const char *r2000_frame_name(int message, int dir)
{
static char result[32];
int i;
for (i = 0; r2000_frame_def[i].def; i++) {
if (r2000_frame_def[i].message == message && r2000_frame_def[i].dir == dir) {
sprintf(result, "%s (%d)", r2000_frame_def[i].name, message);
return result;
}
}
sprintf(result, "UNKNOWN (%d)", message);
return result;
}
static void display_bits(const char *def, const uint8_t *message, int num, int debug)
{
char dispbits[num + 1];
int i;
if (debuglevel > debug)
return;
/* display bits */
if (def)
PDEBUG(DFRAME, debug, "%s\n", def);
for (i = 0; i < num; i++) {
dispbits[i] = ((message[i / 8] >> (7 - (i & 7))) & 1) + '0';
}
dispbits[i] = '\0';
PDEBUG(DFRAME, debug, "%s\n", dispbits);
}
static int dissassemble_frame(frame_t *frame, const uint8_t *message, int num)
{
int i;
const char *def;
uint64_t value;
int dir = (num == 80) ? REL_TO_SM : SM_TO_REL;
memset(frame, 0, sizeof(*frame));
frame->message = message[2] & 0x1f;
def = get_frame_def(frame->message, dir);
if (!def) {
PDEBUG(DFRAME, DEBUG_NOTICE, "Received unknown message type %d (maybe radio noise)\n", frame->message);
display_bits(NULL, message, num, DEBUG_NOTICE);
return -EINVAL;
}
PDEBUG(DFRAME, DEBUG_DEBUG, "Decoding frame %s %s\n", r2000_dir_name(dir), r2000_frame_name(frame->message, dir));
/* dissassemble elements elements */
value = 0;
for (i = 0; i < num; i++) {
value = (value << 1) | ((message[i / 8] >> (7 - (i & 7))) & 1);
if (def[i + 1] != def[i]) {
if (def[i] != '-') {
print_element(def[i], value, dir, DEBUG_DEBUG);
store_element(frame, def[i], value);
}
value = 0;
}
}
display_bits(def, message, num, DEBUG_DEBUG);
return 0;
}
static int assemble_frame(frame_t *frame, uint8_t *message, int num, int debug)
{
int i;
const char *def;
uint64_t value = 0; // make GCC happy
char element;
int dir = (num == 80) ? REL_TO_SM : SM_TO_REL;
def = get_frame_def(frame->message, dir);
if (!def) {
PDEBUG(DFRAME, DEBUG_ERROR, "Cannot assemble unknown message type %d, please define/fix!\n", frame->message);
abort();
}
memset(message, 0, (num + 7) / 8);
if (debug)
PDEBUG(DFRAME, DEBUG_DEBUG, "Ccoding frame %s %s\n", r2000_dir_name(dir), r2000_frame_name(frame->message, dir));
/* assemble elements elements */
element = 0;
for (i = num - 1; i >= 0; i--) {
if (element != def[i]) {
element = def[i];
switch (def[i]) {
case '-':
value = 0;
break;
case '+':
value = 0xffffffffffffffff;
break;
default:
value = fetch_element(frame, element);
}
}
message[i / 8] |= (value & 1) << (7 - (i & 7));
value >>= 1;
}
if (debug) {
for (i = 0; i < num; i++) {
if (def[i + 1] != def[i] && def[i] != '-' && def[i] != '+') {
value = fetch_element(frame, def[i]);
print_element(def[i], value, dir, DEBUG_DEBUG);
}
}
display_bits(def, message, num, DEBUG_DEBUG);
}
return 0;
}
/* encode frame to bits
*/
const char *encode_frame(frame_t *frame, int debug)
{
uint8_t message[11], code[23];
static char bits[32 + 176 + 1];
int i;
assemble_frame(frame, message, 80, debug);
/* hagelbarger code */
hagelbarger_encode(message, code, 88);
memcpy(bits, "10101010101010101010111100010010", 32);
for (i = 0; i < 176; i++)
bits[i + 32] = ((code[i / 8] >> (7 - (i & 7))) & 1) + '0';
bits[208] = '\0';
return bits;
}
//#define GEGENPROBE
/* decode bits to frame */
int decode_frame(frame_t *frame, const char *bits)
{
uint8_t message[11], code[23];
int i, num = strlen(bits);
#ifdef GEGENPROBE
printf("bits as received=%s\n", bits);
#endif
/* hagelbarger code */
memset(code, 0x00, sizeof(code));
for (i = 0; i < num; i++)
code[i / 8] |= (bits[i] & 1) << (7 - (i & 7));
hagelbarger_decode(code, message, num / 2 - 6);
#if 0
for (i = 0; i < num / 2; i++) {
printf("%d", (message[i / 8] >> (7 - (i & 7))) & 1);
if ((i & 7) == 7)
printf(" = 0x%02x\n", message[i / 8]);
}
#endif