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host/layer23: Initial import of the transceiver application 

Build is optional because it depends on some extra libraries

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2013-01-16 22:50:04 +01:00
parent 5b77970991
commit eeafd9fa5b
21 changed files with 2824 additions and 0 deletions
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8
src/host/layer23/configure.ac
View File

@ -21,6 +21,13 @@ AC_CHECK_LIB(gps, gps_waiting, LIBGPS_CFLAGS=" -D_HAVE_GPSD" LIBGPS_LIBS=" -lgps
AC_SUBST([LIBGPS_CFLAGS])
AC_SUBST([LIBGPS_LIBS])
dnl Optional transceiver
AC_ARG_ENABLE([transceiver], [AS_HELP_STRING([--enable-transceiver], [Build the transceiver application])],
[osmo_ac_build_transceiver="$enableval"])
if test "$osmo_ac_build_transceiver" = "yes" ; then
PKG_CHECK_MODULES(LIBOSMODSP, libosmodsp)
fi
AM_CONDITIONAL(BUILD_TRANSCEIVER, test "x$osmo_ac_build_transceiver" = "xyes")
dnl checks for header files
AC_HEADER_STDC
@ -32,6 +39,7 @@ AC_OUTPUT(
src/common/Makefile
src/misc/Makefile
src/mobile/Makefile
src/transceiver/Makefile
include/Makefile
include/osmocom/Makefile
include/osmocom/bb/Makefile

2
src/host/layer23/include/osmocom/bb/common/logging.h
View File

@ -22,6 +22,8 @@ enum {
DSUM,
DSIM,
DGPS,
DTRX,
DAPP,
};
extern const struct log_info log_info;

4
src/host/layer23/src/Makefile.am
View File

@ -1 +1,5 @@
SUBDIRS = common misc mobile
if BUILD_TRANSCEIVER
SUBDIRS += transceiver
endif

12
src/host/layer23/src/common/logging.c
View File

@ -127,6 +127,18 @@ static const struct log_info_cat default_categories[] = {
.color = "\033[1;35m",
.enabled = 1, .loglevel = LOGL_DEBUG,
},
[DTRX] = {
.name = "TRX",
.description = "TRX interface",
.color = "\033[1;36m",
.enabled = 1, .loglevel = LOGL_DEBUG,
},
[DAPP] = {
.name = "APP",
.description = "Application",
.color = "\033[1;35m",
.enabled = 1, .loglevel = LOGL_DEBUG,
},
};
const struct log_info log_info = {

661
src/host/layer23/src/transceiver/LICENSE Normal file
View File

@ -0,0 +1,661 @@
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an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<http://www.gnu.org/licenses/>.

6
src/host/layer23/src/transceiver/Makefile.am Normal file
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AM_CFLAGS = -Wall $(all_includes) -I$(top_srcdir)/include $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBSOSMODSP_CFLAGS)
LDADD = ../common/liblayer23.a $(LIBOSMOCORE_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOCODEC_LIBS) $(LIBOSMODSP_LIBS)
bin_PROGRAMS = transceiver
transceiver_SOURCES = main.c l1ctl_link.c l1ctl.c trx.c gmsk.c gsm_ab.c demod.c ../common/logging.c

58
src/host/layer23/src/transceiver/app.h Normal file
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/*
* app.h
*
* Application state / defines
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TRX_APP_H__
#define __TRX_APP_H__
#include <stdint.h>
#include "l1ctl_link.h"
struct log_target;
struct trx;
struct osmo_gmsk_state;
struct osmo_gmsk_trainseq;
struct app_state
{
/* Logging */
struct log_target *stderr_target;
/* L1CTL link */
struct l1ctl_link l1l;
/* TRX link to OpenBTS */
struct trx *trx;
/* Signal processing */
struct osmo_gmsk_state *gs;
struct osmo_gmsk_trainseq *train_ab;
/* Options */
uint16_t arfcn_sync;
};
#endif /* __TRX_APP_H__ */

43
src/host/layer23/src/transceiver/burst.h Normal file
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/*
* burst.h
*
* Burst format
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TRX_BURST_H__
#define __TRX_BURST_H__
#include <stdint.h>
#define BURST_FB 0
#define BURST_SB 1
#define BURST_DUMMY 2
#define BURST_NB 3
struct burst_data
{
uint8_t type; /* BURST_??? */
uint8_t data[15]; /* Only for NB */
} __attribute__((packed));
#endif /* __TRX_BURST_H__ */

90
src/host/layer23/src/transceiver/demod.c Normal file
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/*
* demod.c
*
* Demodulation routines for tranceiver
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero 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 <osmocom/dsp/cxvec.h>
#include <osmocom/dsp/cxvec_math.h>
#include <l1ctl_proto.h>
#include "app.h"
#include "gmsk.h"
#include "gsm_ab.h"
int
gsm_ab_ind_process(struct app_state *as,
struct l1ctl_bts_burst_ab_ind *bi,
sbit_t *data, float *toa_p)
{
struct osmo_cxvec *burst = NULL;
sbit_t *bits = NULL;
float complex chan;
float toa;
int i, rv;
/* Load burst */
burst = osmo_cxvec_alloc(88);
burst->len = 88;
for (i=0; i<88; i++) {
float f[2];
f[0] = ((float)((char)bi->iq[(i<<1) ])) / 128.0f;
f[1] = ((float)((char)bi->iq[(i<<1)+1])) / 128.0f;
burst->data[i] = f[0] + f[1] * I;
}
/* Normalize burst */
osmo_cxvec_sig_normalize(burst, 1, 0.0f, burst);
/* Detect potential RACH */
rv = gsm_ab_detect(as->gs, as->train_ab, burst, 2.0f, &chan, &toa);
if (rv)
goto err;
printf("TOA : %f\n", toa);
printf("chan : (%f %f) => %f\n", crealf(chan), cimagf(chan), cabsf(chan));
/* Demodulate */
bits = gsm_ab_demodulate(as->gs, burst, chan, toa);
if (!bits)
goto err;
/* Copy */
memset(data, 0x00, 148);
memcpy(data, bits, GSM_AB_BITS);
/* Print result */
for (i=0; i<GSM_AB_BITS; i++)
printf("%d", !!(bits[i] & 0x80));
printf("\n");
*toa_p = toa;
return 0;
err:
return -1;
}

38
src/host/layer23/src/transceiver/demod.h Normal file
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/*
* demod.h
*
* Demodulation routines for tranceiver
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TRX_DEMOD_H__
#define __TRX_DEMOD_H__
#include <osmocom/core/bits.h>
struct app_state;
struct l1ctl_bts_burst_ab_ind;
int gsm_ab_ind_process(struct app_state *as,
struct l1ctl_bts_burst_ab_ind *bi, sbit_t *data, float *toa_p);
#endif /* __TRX_DEMOD_H__ */

289
src/host/layer23/src/transceiver/gmsk.c Normal file
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/*
* gmsk.c
*
* GMSK modulation support
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <osmocom/dsp/cxvec.h>
#include <osmocom/dsp/cxvec_math.h>
#include "gmsk.h"
static struct osmo_cxvec *
osmo_gmsk_generate_pulse(int sym_len, int sps);
static int
osmo_gmsk_generate_rotation_tables(int len, int sps,
struct osmo_cxvec **rot_fwd,
struct osmo_cxvec **rot_rev);
/* ------------------------------------------------------------------------ */
/* GMSK State */
/* ------------------------------------------------------------------------ */
struct osmo_gmsk_state *
osmo_gmsk_init(int sps)
{
struct osmo_gmsk_state *gs;
/* Base */
gs = calloc(1, sizeof(struct osmo_gmsk_state));
if (!gs)
return NULL;
gs->sps = sps;
/* GMSK pulse */
gs->pulse = osmo_gmsk_generate_pulse(2, sps);
if (!gs->pulse)
goto error;
/* Rotation fwd/rev */
osmo_gmsk_generate_rotation_tables(160, sps, &gs->rot_fwd, &gs->rot_rev);
if (!gs->rot_fwd || !gs->rot_rev)
goto error;
return gs;
error:
osmo_gmsk_free(gs);
return NULL;
}
void
osmo_gmsk_free(struct osmo_gmsk_state *gs)
{
if (!gs)
return;
if (gs->pulse)
osmo_cxvec_free(gs->pulse);
if (gs->rot_fwd)
osmo_cxvec_free(gs->rot_fwd);
if (gs->rot_rev)
osmo_cxvec_free(gs->rot_rev);
free(gs);
}
/* ------------------------------------------------------------------------ */
/* GMSK Modulation */
/* ------------------------------------------------------------------------ */
/* Generate a GMSK pulse shape.
* - sym_len: length of ISI
* - sps: samples per symbol
*/
static struct osmo_cxvec *
osmo_gmsk_generate_pulse(int sym_len, int sps)
{
struct osmo_cxvec *pulse;
int n = sps * sym_len + 1; /* length */
int c = (n-1)/2; /* center idx */
int i;
float avg;
pulse = osmo_cxvec_alloc(n);
if (!pulse)
return NULL;
pulse->len = n;
pulse->flags |= CXVEC_FLG_REAL_ONLY;
avg = 0.0f;
for (i=0; i<n; i++) {
float arg = (float)(i-c) / (float)sps;
float arg2 = arg * arg;
float v;
v = 0.96 * expf( -1.1380 * arg2 - 0.527 * arg2 * arg2); /* GSM pulse approx */
avg += v * v;
pulse->data[i] = v;
}
avg = sqrtf(avg);
for (i=0; i<n; i++)
pulse->data[i] /= avg;
return pulse;
}
static int
osmo_gmsk_generate_rotation_tables(
int len, int sps,
struct osmo_cxvec **rot_fwd, struct osmo_cxvec **rot_rev)
{
struct osmo_cxvec *rf, *rr;
float phase;
int i;
rf = osmo_cxvec_alloc(160 * sps);
rr = osmo_cxvec_alloc(160 * sps);
if (!rf || !rr)
return -1;
phase = 0.0f;
for (i=0; i<160*sps; i++) {
rf->data[i] = cexp( I * phase);
rr->data[i] = cexp(- I * phase);
phase += (M_PIf / 2.0f) / (float)sps;
}
rf->len = 160 * sps;
rr->len = 160 * sps;
*rot_fwd = rf;
*rot_rev = rr;
return 0;
}
void
osmo_gmsk_rotate_fwd(const struct osmo_gmsk_state *gs, struct osmo_cxvec *v)
{
int i;
if (v->flags & CXVEC_FLG_REAL_ONLY) {
for (i=0; i<v->len; i++)
v->data[i] = gs->rot_fwd->data[i] * crealf(v->data[i]);
} else {
for (i=0; i<v->len; i++)
v->data[i] = gs->rot_fwd->data[i] * v->data[i];
}
v->flags &= ~CXVEC_FLG_REAL_ONLY;
}
void
osmo_gmsk_rotate_rev(const struct osmo_gmsk_state *gs, struct osmo_cxvec *v)
{
int i;
if (v->flags & CXVEC_FLG_REAL_ONLY) {
for (i=0; i<v->len; i++)
v->data[i] = gs->rot_rev->data[i] * crealf(v->data[i]);
} else {
for (i=0; i<v->len; i++)
v->data[i] = gs->rot_rev->data[i] * v->data[i];
}
v->flags &= ~CXVEC_FLG_REAL_ONLY;
}
struct osmo_cxvec *
osmo_gmsk_modulate_burst(const struct osmo_gmsk_state *gs,
const ubit_t *data, int data_len, int guard_len)
{
struct osmo_cxvec *mod_burst, *shaped_burst;
int burst_size = gs->sps * (data_len + guard_len);
int i;
/* Alloc mod_burst */
mod_burst = osmo_cxvec_alloc(burst_size);
if (!mod_burst)
return NULL;
/* Fill mod_burst */
mod_burst->len = burst_size;
mod_burst->flags |= CXVEC_FLG_REAL_ONLY;
for (i=0; i<burst_size; i++)
mod_burst->data[i] = 0.0f;
for (i=0; i<data_len; i++)
mod_burst->data[i*gs->sps] = data[i] ? 1.0f : -1.0f;
/* Rotate up by pi/2 */
osmo_gmsk_rotate_fwd(gs, mod_burst);
/* Filter with pulse shape */
shaped_burst = osmo_cxvec_convolve(gs->pulse, mod_burst, CONV_NO_DELAY, NULL);
/* Release mod_burst */
osmo_cxvec_free(mod_burst);
return shaped_burst;
}
/* ------------------------------------------------------------------------ */
/* GMSK training sequence */
/* ------------------------------------------------------------------------ */
struct osmo_gmsk_trainseq *
osmo_gmsk_trainseq_generate(struct osmo_gmsk_state *gs, const ubit_t *train, int len)
{
struct osmo_gmsk_trainseq *gts;
struct osmo_cxvec *autocorr = NULL;
gts = calloc(1, sizeof(struct osmo_gmsk_trainseq));
if (!gts)
return NULL;
gts->seq = osmo_gmsk_modulate_burst(gs, train, len, 0);
if (!gts->seq)
goto err;
printf("%d\n", gts->seq->len);
autocorr = osmo_cxvec_correlate(gts->seq, gts->seq, 1, NULL);
if (!autocorr)
goto err;
gts->toa = osmo_cxvec_peak_energy_find(autocorr, 5, PEAK_EARLY_LATE, &gts->gain);
printf("%d\n", autocorr->len);
gts->gain = autocorr->data[0];
osmo_cxvec_free(autocorr);
return gts;
err:
if (gts) {
if (gts->seq)
osmo_cxvec_free(gts->seq);
free(gts);
}
if (autocorr)
osmo_cxvec_free(autocorr);
return NULL;
}
void
osmo_gmsk_trainseq_free(struct osmo_gmsk_trainseq *gts)
{
if (gts) {
osmo_cxvec_free(gts->seq);
free(gts);
}
}

82
src/host/layer23/src/transceiver/gmsk.h Normal file
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/*
* gmsk.h
*
* GMSK modulation support
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __OSMO_GMSK_H__
#define __OSMO_GMSK_H__
#include <complex.h>
#include <osmocom/core/bits.h>
struct osmo_cxvec;
/* GMSK precomputed state for a given sps */
struct osmo_gmsk_state
{
int sps;
struct osmo_cxvec *pulse;
struct osmo_cxvec *rot_fwd;
struct osmo_cxvec *rot_rev;
};
/* State init & cleanup */
struct osmo_gmsk_state *
osmo_gmsk_init(int sps);
void
osmo_gmsk_free(struct osmo_gmsk_state *gs);
/* Modulation */
void
osmo_gmsk_rotate_fwd(const struct osmo_gmsk_state *gs, struct osmo_cxvec *v);
void
osmo_gmsk_rotate_rev(const struct osmo_gmsk_state *gs, struct osmo_cxvec *v);
struct osmo_cxvec *
osmo_gmsk_modulate_burst(const struct osmo_gmsk_state *gs,
const ubit_t *data, int data_len, int guard_len);
/* Training sequences */
struct osmo_gmsk_trainseq {
struct osmo_cxvec *seq;
float complex gain;
float toa;
};
struct osmo_gmsk_trainseq *
osmo_gmsk_trainseq_generate(struct osmo_gmsk_state *gs, const ubit_t *train, int len);
void
osmo_gmsk_trainseq_free(struct osmo_gmsk_trainseq *gts);
#endif /* __OSMO_GMSK_H__ */

105
src/host/layer23/src/transceiver/gsm_ab.c Normal file
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/*
* gsm_ab.c
*
* GSM access burst SDR support
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <osmocom/core/bits.h>
#include <osmocom/dsp/cxvec.h>
#include <osmocom/dsp/cxvec_math.h>
#include "gmsk.h"
#include "gsm_ab.h"
const ubit_t gsm_ab_train[] = {
0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1,
1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 1, 1, 1, 1, 0, 0, 0,
};
int
gsm_ab_detect(const struct osmo_gmsk_state *gs,
const struct osmo_gmsk_trainseq *rach,
const struct osmo_cxvec *burst, float thresh,
float complex *peak, float *toa)
{
struct osmo_cxvec *cb = NULL;
int found = 0;
cb = osmo_cxvec_correlate(rach->seq, burst, 1, NULL);
if (!cb)
return -ENOMEM;
*toa = osmo_cxvec_peak_energy_find(cb, 5, PEAK_WEIGH_WIN_CENTER, peak);
if (*toa < 0.0 || *toa >= cb->len)
goto done;
*toa = *toa - rach->toa - 8*gs->sps;
*peak = *peak / rach->gain;
found = 1;
done:
osmo_cxvec_free(cb);
if (!found) {
*toa = 0.0f;
*peak = 1.0f;
}
return !found;
}
sbit_t *
gsm_ab_demodulate(struct osmo_gmsk_state *gs,
struct osmo_cxvec *burst, float complex channel, float toa)
{
sbit_t *rv;
int i;
/* Return vector */
rv = malloc(GSM_AB_BITS * sizeof(sbit_t));
if (!rv)
return NULL;
/* Demod */
osmo_cxvec_scale(burst, (1.0f / channel), burst);
osmo_cxvec_delay(burst, -toa, burst);
osmo_gmsk_rotate_rev(gs, burst);
/* Mapping / Slicing */
for (i=0; i<GSM_AB_BITS; i++) {
int v = (int)(-127.0f * crealf(burst->data[i*gs->sps]));
if (v > 127)
v = 127;
else if (v < -127)
v = -127;
rv[i] = v;
}
return rv;
}

55
src/host/layer23/src/transceiver/gsm_ab.h Normal file
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/*
* gsm_ab.h
*
* GSM access burst SDR support
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __OSMO_GSM_AB_H__
#define __OSMO_GSM_AB_H__
#include <complex.h>
#include <osmocom/core/bits.h>
struct osmo_gmsk_state;
struct osmo_gmsk_trainseq;
struct osmo_cxvec;
#define GSM_AB_TRAIN_LEN 41
#define GSM_AB_BITS 88 /* 8 + 41 + 36 + 3 */
extern const ubit_t gsm_ab_train[];
int
gsm_ab_detect(const struct osmo_gmsk_state *gs,
const struct osmo_gmsk_trainseq *rach,
const struct osmo_cxvec *burst, float thresh,
float complex *peak, float *toa);
sbit_t *
gsm_ab_demodulate(struct osmo_gmsk_state *gs,
struct osmo_cxvec *burst,
float complex channel, float toa);
#endif /* __OSMO_GSM_AB_H__ */

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src/host/layer23/src/transceiver/l1ctl.c Normal file
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/*
* l1ctl.c
*
* Minimal L1CTL
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <osmocom/core/select.h>
#include <osmocom/core/talloc.h>
#include <osmocom/bb/common/logging.h>
#include <errno.h>
#include <arpa/inet.h>
#include <osmocom/gsm/gsm_utils.h>
#include <l1ctl_proto.h>
#include "app.h"
#include "burst.h"
#include "demod.h"
#include "trx.h"
/* ------------------------------------------------------------------------ */
/* L1CTL exported API */
/* ------------------------------------------------------------------------ */
static struct msgb *
_l1ctl_alloc(uint8_t msg_type)
{
struct l1ctl_hdr *l1h;
struct msgb *msg = msgb_alloc_headroom(256, 4, "osmo_l1");
if (!msg) {
LOGP(DL1C, LOGL_ERROR, "Failed to allocate memory.\n");
return NULL;
}
msg->l1h = msgb_put(msg, sizeof(*l1h));
l1h = (struct l1ctl_hdr *) msg->l1h;
l1h->msg_type = msg_type;
return msg;
}
int
l1ctl_tx_reset_req(struct l1ctl_link *l1l, uint8_t type)
{
struct msgb *msg;
struct l1ctl_reset *res;
msg = _l1ctl_alloc(L1CTL_RESET_REQ);
if (!msg)
return -1;
LOGP(DL1C, LOGL_INFO, "Tx Reset Req (%u)\n", type);
res = (struct l1ctl_reset *) msgb_put(msg, sizeof(*res));
res->type = type;
return l1l_send(l1l, msg);
}
int
l1ctl_tx_fbsb_req(struct l1ctl_link *l1l,
uint16_t arfcn, uint8_t flags, uint16_t timeout,
uint8_t sync_info_idx, uint8_t ccch_mode)
{
struct msgb *msg;
struct l1ctl_fbsb_req *req;
LOGP(DL1C, LOGL_INFO, "Sync Req\n");
msg = _l1ctl_alloc(L1CTL_FBSB_REQ);
if (!msg)
return -1;
req = (struct l1ctl_fbsb_req *) msgb_put(msg, sizeof(*req));
req->band_arfcn = htons(arfcn);
req->timeout = htons(timeout);
/* Threshold when to consider FB_MODE1: 4kHz - 1kHz */
req->freq_err_thresh1 = htons(11000 - 1000);
/* Threshold when to consider SCH: 1kHz - 200Hz */
req->freq_err_thresh2 = htons(1000 - 200);
/* not used yet! */
req->num_freqerr_avg = 3;
req->flags = flags;
req->sync_info_idx = sync_info_idx;
req->ccch_mode = ccch_mode;
return l1l_send(l1l, msg);
}
int
l1ctl_tx_bts_mode(struct l1ctl_link *l1l,
uint8_t enabled, uint8_t bsic, uint16_t band_arfcn)
{
struct msgb *msg;
struct l1ctl_bts_mode *be;
msg = _l1ctl_alloc(L1CTL_BTS_MODE);
if (!msg)
return -1;
LOGP(DL1C, LOGL_INFO, "BTS Mode (enabled=%u, bsic=%u, arfcn=%u)\n",
enabled, bsic, band_arfcn);
be = (struct l1ctl_bts_mode *) msgb_put(msg, sizeof(*be));
be->enabled = enabled;
be->bsic = bsic;
be->band_arfcn = htons(band_arfcn);
return l1l_send(l1l, msg);
}
int
l1ctl_tx_bts_burst_req(struct l1ctl_link *l1l,
uint32_t fn, uint8_t tn, struct burst_data *burst)
{
struct msgb *msg;
struct l1ctl_bts_burst_req *br;
msg = _l1ctl_alloc(L1CTL_BTS_BURST_REQ);
if (!msg)
return -1;
LOGP(DL1C, LOGL_INFO, "BTS Tx Burst (%d:%d)\n", fn, tn);
br = (struct l1ctl_bts_burst_req *) msgb_put(msg, sizeof(*br));
br->fn = htonl(fn);
br->tn = tn;
br->type = burst->type;
if (burst->type == BURST_NB)
memcpy(msgb_put(msg, 15), burst->data, 15);
return l1l_send(l1l, msg);
}
/* ------------------------------------------------------------------------ */
/* L1CTL Receive handling */
/* ------------------------------------------------------------------------ */
static int
_l1ctl_rx_bts_burst_nb_ind(struct app_state *as, struct msgb *msg)
{
struct l1ctl_bts_burst_nb_ind *bi;
uint32_t fn;
int rc, i;
sbit_t data[148];
float toa;
bi = (struct l1ctl_bts_burst_nb_ind *) msg->l1h;
if (msgb_l1len(msg) < sizeof(*bi)) {
LOGP(DL1C, LOGL_ERROR, "MSG too short Burst NB Ind: %u\n",
msgb_l2len(msg));
rc = -EINVAL;
goto exit;
}
fn = ntohl(bi->fn);
LOGP(DL1C, LOGL_INFO, "Normal Burst Indication (fn=%d)\n", fn);
memset(data, 0x00, 148);
osmo_pbit2ubit_ext((ubit_t*)data, 3, bi->data, 0, 57, 0);
osmo_pbit2ubit_ext((ubit_t*)data, 88, bi->data, 57, 57, 0);
data[60] = data[87] = 1;
for (i=0; i<148; i++)
data[i] = data[i] ? -127 : 127;
trx_data_ind(as->trx, fn, 0, data, 0.0f);
exit:
msgb_free(msg);
return rc;
}
static int
_l1ctl_rx_bts_burst_ab_ind(struct app_state *as, struct msgb *msg)
{
struct l1ctl_bts_burst_ab_ind *bi;
uint32_t fn;
int rc;
sbit_t data[148];
float toa;
bi = (struct l1ctl_bts_burst_ab_ind *) msg->l1h;
if (msgb_l1len(msg) < sizeof(*bi)) {
LOGP(DL1C, LOGL_ERROR, "MSG too short Burst AB Ind: %u\n",
msgb_l2len(msg));
rc = -EINVAL;
goto exit;
}
fn = ntohl(bi->fn);
LOGP(DL1C, LOGL_INFO, "Access Burst Indication (fn=%d)\n", fn);
gsm_ab_ind_process(as, bi, data, &toa);
trx_data_ind(as->trx, fn, 0, data, toa);
exit:
msgb_free(msg);
return rc;
}
static int
_l1ctl_rx_data_ind(struct app_state *as, struct msgb *msg)
{
struct l1ctl_info_dl *dl;
struct l1ctl_data_ind *di;
int rc;
dl = (struct l1ctl_info_dl *) msg->l1h;
msg->l2h = dl->payload;
di = (struct l1ctl_data_ind *) msg->l2h;
if (msgb_l1len(msg) < sizeof(*dl)) {
LOGP(DL1C, LOGL_ERROR, "Short Layer2 message: %u\n",
msgb_l2len(msg));
rc = -EINVAL;
goto exit;
}
if (msgb_l2len(msg) < sizeof(*di)) {
LOGP(DL1C, LOGL_ERROR, "MSG too short Data Ind: %u\n",
msgb_l3len(msg));
rc = -EINVAL;
goto exit;
}
#if 0
if (dl->fire_crc > 2) {
LOGP(DAPP, LOGL_INFO, "Invalid BCCH message, retry sync ...\n");
rc = l1ctl_tx_fbsb_req(&as->l1l, as->arfcn_sync, L1CTL_FBSB_F_FB01SB, 100, 0, CCCH_MODE_NONE);
} else {
LOGP(DAPP, LOGL_INFO, "Valid BCCH message, sync ok -> switch to BTS mode\n");
rc = 0;
}
#endif
rc = trx_clk_ind(as->trx, ntohl(dl->frame_nr));
exit:
msgb_free(msg);
return rc;
}
static int
_l1ctl_rx_fbsb_conf(struct app_state *as, struct msgb *msg)
{
struct l1ctl_info_dl *dl;
struct l1ctl_fbsb_conf *sc;
int rc;
dl = (struct l1ctl_info_dl *) msg->l1h;
msg->l2h = dl->payload;
sc = (struct l1ctl_fbsb_conf *) msg->l2h;
if (msgb_l1len(msg) < sizeof(*dl)) {
LOGP(DL1C, LOGL_ERROR, "Short Layer2 message: %u\n",
msgb_l2len(msg));
rc = -EINVAL;
goto exit;
}
if (msgb_l2len(msg) < sizeof(*sc)) {
LOGP(DL1C, LOGL_ERROR, "MSG too short FBSB Conf: %u\n",
msgb_l3len(msg));
rc = -EINVAL;
goto exit;
}
if (sc->result != 0) {
LOGP(DAPP, LOGL_INFO, "Sync failed, retrying ... \n");
rc = l1ctl_tx_fbsb_req(&as->l1l, as->arfcn_sync, L1CTL_FBSB_F_FB01SB, 100, 0, CCCH_MODE_NONE);
} else {
LOGP(DAPP, LOGL_INFO, "Sync acquired, wait for BCCH ...\n");
}
rc = 0;
exit:
msgb_free(msg);
return rc;
}
int
l1ctl_recv(void *data, struct msgb *msg)
{
struct app_state *as = data;
struct l1ctl_hdr *l1h;
int rc = 0;
/* move the l1 header pointer to point _BEHIND_ l1ctl_hdr,
as the l1ctl header is of no interest to subsequent code */
l1h = (struct l1ctl_hdr *) msg->l1h;
msg->l1h = l1h->data;
/* Act */
switch (l1h->msg_type) {
case L1CTL_BTS_BURST_AB_IND:
rc = _l1ctl_rx_bts_burst_ab_ind(as, msg);
break;
case L1CTL_BTS_BURST_NB_IND:
rc = _l1ctl_rx_bts_burst_nb_ind(as, msg);
break;
case L1CTL_DATA_IND:
rc = _l1ctl_rx_data_ind(as, msg);
break;
case L1CTL_FBSB_CONF:
rc = _l1ctl_rx_fbsb_conf(as, msg);
break;
case L1CTL_RESET_IND:
case L1CTL_RESET_CONF:
LOGP(DAPP, LOGL_INFO, "Reset received: Starting sync.\n");
l1ctl_tx_fbsb_req(&as->l1l, as->arfcn_sync, L1CTL_FBSB_F_FB01SB, 100, 0, CCCH_MODE_NONE);
msgb_free(msg);
break;
default:
LOGP(DL1C, LOGL_ERROR, "Unknown MSG: %u\n", l1h->msg_type);
msgb_free(msg);
break;
}
return rc;
}

49
src/host/layer23/src/transceiver/l1ctl.h Normal file
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@ -0,0 +1,49 @@
/*
* l1ctl.h
*
* Minimal L1CTL
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TRX_L1CTL_H__
#define __TRX_L1CTL_H__
#include <stdint.h>
#include <l1ctl_proto.h>
struct burst_data;
struct l1ctl_link;
struct msgb;
int l1ctl_tx_reset_req(struct l1ctl_link *l1l, uint8_t type);
int l1ctl_tx_fbsb_req(struct l1ctl_link *l1l,
uint16_t arfcn, uint8_t flags, uint16_t timeout,
uint8_t sync_info_idx, uint8_t ccch_mode);
int l1ctl_tx_bts_mode(struct l1ctl_link *l1l,
uint8_t enabled, uint8_t bsic, uint16_t band_arfcn);
int l1ctl_tx_bts_burst_req(struct l1ctl_link *l1l,
uint32_t fn, uint8_t tn, struct burst_data *burst);
int l1ctl_recv(void *data, struct msgb *msg);
#endif /* __TRX_L1CTL_H__ */

187
src/host/layer23/src/transceiver/l1ctl_link.c Normal file
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@ -0,0 +1,187 @@
/*
* l1ctl_link.c
*
* L1CTL link handling
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <osmocom/core/write_queue.h>
#include <osmocom/bb/common/logging.h>
#include "l1ctl_link.h"
#define L1CTL_LENGTH 256
#define L1CTL_HEADROOM 32
static int
_l1l_read(struct osmo_fd *fd)
{
struct l1ctl_link *l1l = fd->data;
struct msgb *msg;
uint16_t len;
int rc;
msg = msgb_alloc_headroom(L1CTL_LENGTH+L1CTL_HEADROOM, L1CTL_HEADROOM, "L1CTL");
if (!msg) {
LOGP(DL1C, LOGL_ERROR, "Failed to allocate msg.\n");
return -ENOMEM;
}
rc = read(fd->fd, &len, sizeof(len));
if (rc < sizeof(len)) {
LOGP(DL1C, LOGL_ERROR, "l1ctl socket failed\n");
msgb_free(msg);
if (rc >= 0)
rc = -EIO;
l1l_close(l1l);
return rc;
}
len = ntohs(len);
if (len > L1CTL_LENGTH) {
LOGP(DL1C, LOGL_ERROR, "Length is too big: %u\n", len);
msgb_free(msg);
return -EINVAL;
}
msg->l1h = msgb_put(msg, len);
rc = read(fd->fd, msg->l1h, msgb_l1len(msg));
if (rc != msgb_l1len(msg)) {
LOGP(DL1C, LOGL_ERROR, "Can not read data: len=%d rc=%d "
"errno=%d\n", len, rc, errno);
msgb_free(msg);
return rc;
}
return l1l->cb(l1l->cb_data, msg);
}
static int
_l1l_write(struct osmo_fd *fd, struct msgb *msg)
{
int rc;
if (fd->fd <= 0)
return -EINVAL;
rc = write(fd->fd, msg->data, msg->len);
if (rc != msg->len) {
LOGP(DL1C, LOGL_ERROR, "Failed to write data: rc: %d\n", rc);
return rc;
}
return 0;
}
int
l1l_open(struct l1ctl_link *l1l,
const char *path, l1ctl_cb_t cb, void *cb_data)
{
int rc, fd;
struct sockaddr_un local;
l1l->cb = cb;
l1l->cb_data = cb_data;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to create unix domain socket.\n");
return fd;
}
l1l->wq.bfd.fd = fd;
local.sun_family = AF_UNIX;
strncpy(local.sun_path, path, sizeof(local.sun_path));
local.sun_path[sizeof(local.sun_path) - 1] = '\0';
rc = connect(fd, (struct sockaddr *) &local, sizeof(local));
if (rc < 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to connect to '%s': %s\n",
local.sun_path, strerror(errno));
close(fd);
return rc;
}
osmo_wqueue_init(&l1l->wq, 100);
l1l->wq.bfd.data = l1l;
l1l->wq.bfd.when = BSC_FD_READ;
l1l->wq.read_cb = _l1l_read;
l1l->wq.write_cb = _l1l_write;
rc = osmo_fd_register(&l1l->wq.bfd);
if (rc != 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to register fd.\n");
close(fd);
return rc;
}
return 0;
}
int
l1l_close(struct l1ctl_link *l1l)
{
if (l1l->wq.bfd.fd <= 0)
return -EINVAL;
osmo_fd_unregister(&l1l->wq.bfd);
close(l1l->wq.bfd.fd);
l1l->wq.bfd.fd = -1;
osmo_wqueue_clear(&l1l->wq);
return 0;
}
int
l1l_send(struct l1ctl_link *l1l, struct msgb *msg)
{
uint16_t *len;
DEBUGP(DL1C, "Sending: '%s'\n", osmo_hexdump(msg->data, msg->len));
if (msg->l1h != msg->data)
LOGP(DL1C, LOGL_NOTICE, "Message L1 header != Message Data\n");
/* prepend 16bit length before sending */
len = (uint16_t *) msgb_push(msg, sizeof(*len));
*len = htons(msg->len - sizeof(*len));
if (osmo_wqueue_enqueue(&l1l->wq, msg) != 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to enqueue msg.\n");
msgb_free(msg);
return -EIO;
}
return 0;
}

50
src/host/layer23/src/transceiver/l1ctl_link.h Normal file
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@ -0,0 +1,50 @@
/*
* l1ctl_link.h
*
* L1CTL link handling
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TRX_L1CTL_LINK_H__
#define __TRX_L1CTL_LINK_H__
#include <osmocom/core/write_queue.h>
typedef int (*l1ctl_cb_t)(void *data, struct msgb *msgb);
struct l1ctl_link
{
struct osmo_wqueue wq;
l1ctl_cb_t cb;
void *cb_data;
};
int l1l_open(struct l1ctl_link *l1l,
const char *path, l1ctl_cb_t cb, void *cb_data);
int l1l_close(struct l1ctl_link *l1l);
int l1l_send(struct l1ctl_link *l1l, struct msgb *msg);
#endif /* __TRX_L1CTL_LINK_H__ */

101
src/host/layer23/src/transceiver/main.c Normal file
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@ -0,0 +1,101 @@
/*
* main.c
*
* Tranceiver main program
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <osmocom/core/select.h>
#include <osmocom/core/talloc.h>
#include <osmocom/bb/common/logging.h>
#include "app.h"
#include "l1ctl.h"
#include "l1ctl_link.h"
#include "trx.h"
#include "gmsk.h"
#include "gsm_ab.h"
void *l23_ctx = NULL;
int main(int argc, char *argv[])
{
struct app_state _as, *as = &_as;
int rv;
/* Options */
if (argc != 2) {
fprintf(stderr, "Usage: %s arfcn_sync\n", argv[0]);
return -1;
}
/* App state init */
memset(as, 0x00, sizeof(struct app_state));
as->arfcn_sync = atoi(argv[1]);
printf("%d\n", as->arfcn_sync);
/* Init talloc */
l23_ctx = talloc_named_const(NULL, 1, "l23 app context");
/* Init logging */
log_init(&log_info, l23_ctx);
as->stderr_target = log_target_create_stderr();
log_add_target(as->stderr_target);
log_set_all_filter(as->stderr_target, 1);
/* Init signal processing */
/* Init GMSK tables */
as->gs = osmo_gmsk_init(1);
if (!as->gs)
exit(-1);
/* Init AB corr seq */
as->train_ab = osmo_gmsk_trainseq_generate(as->gs, gsm_ab_train, GSM_AB_TRAIN_LEN);
if (!as->train_ab)
exit(-1);
/* TRX interface with OpenBTS */
as->trx = trx_alloc("127.0.0.1", 5700, &as->l1l);
if (!as->trx)
exit(-1);
/* Establish l1ctl link */
rv = l1l_open(&as->l1l, "/tmp/osmocom_l2", l1ctl_recv, as);
if (rv)
exit(-1);
/* Reset phone */
l1ctl_tx_reset_req(&as->l1l, L1CTL_RES_T_FULL);
/* Main loop */
while (1) {
osmo_select_main(0);
}
return 0;
}

557
src/host/layer23/src/transceiver/trx.c Normal file
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@ -0,0 +1,557 @@
/*
* trx.c
*
* OpenBTS TRX interface handling
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <osmocom/core/bits.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/bb/common/logging.h>
#include "l1ctl.h"
#include "l1ctl_link.h"
#include "trx.h"
#include "burst.h"
static int _trx_clk_read_cb(struct osmo_fd *ofd, unsigned int what);
static int _trx_ctrl_read_cb(struct osmo_fd *ofd, unsigned int what);
static int _trx_data_read_cb(struct osmo_fd *ofd, unsigned int what);
/* ------------------------------------------------------------------------ */
/* Init */
/* ------------------------------------------------------------------------ */
int
_trx_udp_init(struct trx *trx,
struct osmo_fd *ofd, const char *addr, uint16_t port,
int (*cb)(struct osmo_fd *fd, unsigned int what))
{
struct sockaddr_storage _sas;
struct sockaddr *sa = (struct sockaddr *)&_sas;
socklen_t sa_len;
int rv;
/* Init */
ofd->fd = -1;
ofd->cb = cb;
ofd->data = trx;
/* Listen / Binds */
rv = osmo_sock_init_ofd(
ofd,
AF_UNSPEC, SOCK_DGRAM, 0, addr, port,
OSMO_SOCK_F_BIND);
if (rv < 0)
goto err;
/* Connect */
sa_len = sizeof(struct sockaddr_storage);
rv = getsockname(ofd->fd, sa, &sa_len);
if (rv)
goto err;
if (sa->sa_family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
sin->sin_port = htons(ntohs(sin->sin_port) + 100);
} else if (sa->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
sin6->sin6_port = htons(ntohs(sin6->sin6_port) + 100);
} else {
rv = -EINVAL;
goto err;
}
rv = connect(ofd->fd, sa, sa_len);
if (rv)
goto err;
return 0;
err:
if (ofd->fd >= 0) {
osmo_fd_unregister(ofd);
close(ofd->fd);
}
return rv;
}
struct trx *
trx_alloc(const char *addr, uint16_t base_port, struct l1ctl_link *l1l)
{
struct trx *trx;
int rv;
/* Alloc */
trx = talloc_zero(NULL, struct trx);
if (!trx)
return NULL;
/* Init */
trx->arfcn = ARFCN_INVAL;
trx->bsic = BSIC_INVAL;
/* L1 link */
trx->l1l = l1l;
/* Clock */
rv = _trx_udp_init(trx, &trx->ofd_clk, addr, base_port, _trx_clk_read_cb);
if (rv)
goto err;
/* Control */
rv = _trx_udp_init(trx, &trx->ofd_ctrl, addr, base_port+1, _trx_ctrl_read_cb);
if (rv)
goto err;
/* Data */
rv = _trx_udp_init(trx, &trx->ofd_data, addr, base_port+2, _trx_data_read_cb);
if (rv)
goto err;
return trx;
err:
return NULL;
}
void
trx_free(struct trx *trx)
{
/* FIXME close and remove ofd */
talloc_free(trx);
}
/* ------------------------------------------------------------------------ */
/* Clk interface */
/* ------------------------------------------------------------------------ */
static int
_trx_clk_read_cb(struct osmo_fd *ofd, unsigned int what)
{
char buf[1500];
int l;
l = recv(ofd->fd, buf, sizeof(buf), 0);
if (l <= 0)
return l;
LOGP(DTRX, LOGL_ERROR, "[!] Unexpected data on the CLK interface, discarding\n");
return l;
}
int
trx_clk_ind(struct trx *trx, uint32_t fn)
{
char buf[64];
LOGP(DTRX, LOGL_DEBUG, "TRX CLK Indication %d\n", fn);
snprintf(buf, sizeof(buf), "IND CLOCK %d", fn + 2); /* FIXME Dynamic adjust ? */
send(trx->ofd_clk.fd, buf, strlen(buf)+1, 0);
return 0;
}
/* ------------------------------------------------------------------------ */
/* Control interface */
/* ------------------------------------------------------------------------ */
#define TRX_CMD_BUF_LEN 128
static int
_trx_ctrl_send_resp(struct trx *trx, const char *cmd, const char *fmt, ...)
{
va_list ap;
char buf[TRX_CMD_BUF_LEN];
int l;
l = snprintf(buf, sizeof(buf)-1, "RSP %s ", cmd);
va_start(ap, fmt);
l += vsnprintf(buf+l, sizeof(buf)-l-1, fmt, ap);
va_end(ap);
buf[l] = '\0';
LOGP(DTRX, LOGL_DEBUG, "TRX Control send: |%s|\n", buf);
send(trx->ofd_ctrl.fd, buf, strlen(buf)+1, 0);
return 0;
}
static int
_trx_ctrl_cmd_poweroff(struct trx *trx, const char *cmd, const char *args)
{
l1ctl_tx_bts_mode(trx->l1l, 0, 0, 0);
return _trx_ctrl_send_resp(trx, cmd, "%d", 0);
}
static int
_trx_ctrl_cmd_poweron(struct trx *trx, const char *cmd, const char *args)
{
int rv;
if (trx->bsic == BSIC_INVAL || trx->arfcn == ARFCN_INVAL) {
LOGP(DTRX, LOGL_ERROR,
"TRX received POWERON when not fully configured\n");
rv = -EINVAL;
} else {
rv = l1ctl_tx_bts_mode(trx->l1l, 1, trx->bsic, trx->arfcn);
}
return _trx_ctrl_send_resp(trx, cmd, "%d", rv);
}
static int
_trx_ctrl_cmd_settsc(struct trx *trx, const char *cmd, const char *args)
{
LOGP(DTRX, LOGL_ERROR,
"TRX received SETTSC command ! "
"OpenBTS should be configured to send SETBSIC command !\n");
return _trx_ctrl_send_resp(trx, cmd, "%d", -1);
}
static int
_trx_ctrl_cmd_setbsic(struct trx *trx, const char *cmd, const char *args)
{
int bsic = atoi(args);
if (bsic >= 64) {
LOGP(DTRX, LOGL_ERROR, "Invalid BSIC received\n");
return _trx_ctrl_send_resp(trx, cmd, "%d", -1);
}
trx->bsic = bsic;
return _trx_ctrl_send_resp(trx, cmd, "%d", 0);
}
static int
_trx_ctrl_cmd_setrxgain(struct trx *trx, const char *cmd, const char *args)
{
int db = atoi(args);
return _trx_ctrl_send_resp(trx, cmd, "%d %d", 0, db);
}
static int
_trx_ctrl_cmd_setpower(struct trx *trx, const char *cmd, const char *args)
{
int db = atoi(args);
return _trx_ctrl_send_resp(trx, cmd, "%d %d", 0, db);
}
static int
_trx_ctrl_cmd_setmaxdly(struct trx *trx, const char *cmd, const char *args)
{
int dly = atoi(args);
return _trx_ctrl_send_resp(trx, cmd, "%d %d", 0, dly);
}
static int
_trx_ctrl_cmd_setslot(struct trx *trx, const char *cmd, const char *args)
{
int n, tn, type;
n = sscanf(args, "%d %d", &tn, &type);
if ((n != 2) || (tn < 0) || (tn > 7) || (type < 0) || (type > 8))
return _trx_ctrl_send_resp(trx, cmd, "%d %d %d", -1, tn, type);
return _trx_ctrl_send_resp(trx, cmd, "%d %d", 0, type);
}
static int
_trx_ctrl_cmd_rxtune(struct trx *trx, const char *cmd, const char *args)
{
int freq_khz = atoi(args);
uint16_t arfcn;
int rv = 0;
arfcn = gsm_freq102arfcn(freq_khz / 100, 1);
arfcn &= ~ARFCN_UPLINK;
if ( arfcn == ARFCN_INVAL ||
(trx->arfcn != ARFCN_INVAL && trx->arfcn != arfcn)) {
LOGP(DTRX, LOGL_ERROR, "RXTUNE called with invalid/inconsistent frequency\n");
goto done;
}
if (trx->arfcn == ARFCN_INVAL) {
LOGP(DTRX, LOGL_NOTICE, "Setting C0 ARFCN to %d (%s)\n",
arfcn & ~ARFCN_FLAG_MASK, gsm_band_name(gsm_arfcn2band(arfcn)));
trx->arfcn = arfcn;
}
done:
return _trx_ctrl_send_resp(trx, cmd, "%d %d", rv, freq_khz);
}
static int
_trx_ctrl_cmd_txtune(struct trx *trx, const char *cmd, const char *args)
{
int freq_khz = atoi(args);
uint16_t arfcn;
int rv = 0;
arfcn = gsm_freq102arfcn(freq_khz / 100, 0);
if ( arfcn == ARFCN_INVAL ||
(trx->arfcn != ARFCN_INVAL && trx->arfcn != arfcn)) {
LOGP(DTRX, LOGL_ERROR, "TXTUNE called with invalid/inconsistent frequency\n");
goto done;
}
if (trx->arfcn == ARFCN_INVAL) {
LOGP(DTRX, LOGL_NOTICE, "Setting C0 ARFCN to %d (%s)\n",
arfcn & ~ARFCN_FLAG_MASK, gsm_band_name(gsm_arfcn2band(arfcn)));
trx->arfcn = arfcn;
}
done:
return _trx_ctrl_send_resp(trx, cmd, "%d %d", rv, freq_khz);
}
struct trx_cmd_handler {
const char *cmd;
int (*handler)(struct trx *trx, const char *cmd, const char *args);
};
static const struct trx_cmd_handler trx_handlers[] = {
{ "POWEROFF", _trx_ctrl_cmd_poweroff },
{ "POWERON", _trx_ctrl_cmd_poweron },
{ "SETTSC", _trx_ctrl_cmd_settsc },
{ "SETBSIC", _trx_ctrl_cmd_setbsic },
{ "SETPOWER", _trx_ctrl_cmd_setpower },
{ "SETRXGAIN", _trx_ctrl_cmd_setrxgain },
{ "SETMAXDLY", _trx_ctrl_cmd_setmaxdly },
{ "SETSLOT", _trx_ctrl_cmd_setslot },
{ "RXTUNE", _trx_ctrl_cmd_rxtune },
{ "TXTUNE", _trx_ctrl_cmd_txtune },
{ NULL, NULL }
};
static int
_trx_ctrl_read_cb(struct osmo_fd *ofd, unsigned int what)
{
struct trx *trx = ofd->data;
const struct trx_cmd_handler *ch;
char buf[TRX_CMD_BUF_LEN];
char *cmd, *args;
ssize_t l;
int rv;
/* Get message */
l = recv(ofd->fd, buf, sizeof(buf)-1, 0);
if (l <= 0) {
/* FIXME handle exception ... */
return l;
}
/* Check 'CMD ' */
if (strncmp(buf, "CMD ", 4))
goto inval;
/* Check length */
buf[l] = '\0'; /* Safety */
if (strlen(buf) != (l-1))
goto inval;
/* Split command name and arguments */
cmd = &buf[4];
args = strchr(cmd, ' ');
if (!args)
args = &buf[l];
else
*args++ = '\0';
LOGP(DTRX, LOGL_DEBUG, "TRX Control recv: |%s|%s|\n", cmd, args);
/* Find handler */
for (ch=trx_handlers; ch->cmd; ch++) {
if (!strcmp(ch->cmd, cmd)) {
rv = ch->handler(trx, cmd, args);
if (rv)
LOGP(DTRX, LOGL_ERROR, "[!] Processing failure for command '%s'\n", cmd);
break;
}
}
if (!ch->cmd) {
LOGP(DTRX, LOGL_ERROR, "[!] No handlers found for command '%s'. Empty response\n", cmd);
_trx_ctrl_send_resp(trx, cmd, "%d", -1);
}
/* Done ! */
return l;
inval:
LOGP(DTRX, LOGL_ERROR, "[!] Invalid command '%s' on CTRL interface, discarding\n", buf);
return l;
}
/* ------------------------------------------------------------------------ */
/* Data interface */
/* ------------------------------------------------------------------------ */
#define TRX_DATA_BUF_LEN 256
static const ubit_t dummy_burst[] = {
0,0,0,
1,1,1,1,1,0,1,1,0,1,1,1,0,1,1,0,0,0,0,0,1,0,1,0,0,1,0,0,1,1,1,0,
0,0,0,0,1,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,1,1,1,0,0,
0,1,0,1,1,1,0,0,0,1,0,1,1,1,0,0,0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,0,
0,0,1,1,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,0,1,0,0,1,1,1,1,1,0,0,0,1,
0,0,1,0,1,1,1,1,1,0,1,0,1,0,
0,0,0,
};
static int
_trx_data_read_cb(struct osmo_fd *ofd, unsigned int what)
{
struct trx *trx = ofd->data;
uint8_t buf[TRX_DATA_BUF_LEN];
uint32_t fn;
int l, tn, pwr_att;
ubit_t *data;
struct burst_data _burst, *burst = &_burst;
/* Get message */
l = recv(ofd->fd, buf, sizeof(buf)-1, 0);
if (l <= 0) {
/* FIXME handle exception ... */
return l;
}
/* Validate */
if (l != 1+4+1+148)
goto inval;
/* Parse */
tn = buf[0];
fn = (buf[1] << 24) | (buf[2] << 16) | (buf[3] << 8) | buf[4];
pwr_att = buf[5];
data = buf+6;
/* Ignore FCCH and SCH completely, they're handled internally */
if (((fn % 51) % 10) < 2)
goto skip;
/* Detect dummy bursts */
if (!memcmp(data, dummy_burst, sizeof(dummy_burst))) {
LOGP(DTRX, LOGL_DEBUG, "TRX Data %u:%d:%d:DUMMY\n",
fn, tn, pwr_att);
goto skip;
}
/* Pack */
burst->type = BURST_NB;
burst->data[14] = 0x00;
osmo_ubit2pbit_ext(burst->data, 0, data, 3, 58, 0);
osmo_ubit2pbit_ext(burst->data, 58, data, 87, 58, 0);
/* Send to L1 */
if (tn == 0)
l1ctl_tx_bts_burst_req(trx->l1l, fn, tn, burst);
/* Debug */
if (tn == 0)
LOGP(DTRX, LOGL_DEBUG, "TRX Data %u:%d:%d:%s\n",
fn, tn, pwr_att, osmo_hexdump_nospc(burst->data, 15));
/* Done ! */
skip:
return l;
inval:
LOGP(DTRX, LOGL_ERROR, "[!] Invalid data burst on DATA interface, discarding\n");
return l;
}
int
trx_data_ind(struct trx *trx, uint32_t fn, uint8_t tn, sbit_t *data, float toa)
{
char buf[158];
short toa_int = (short)(toa * 256.0f);
int i;
LOGP(DTRX, LOGL_DEBUG, "TRX Data Indication (fn=%d, tn=%d, toa=%.2f)\n", fn, tn, toa);
buf[0] = tn;
buf[1] = (fn >> 24) & 0xff;
buf[2] = (fn >> 16) & 0xff;
buf[3] = (fn >> 8) & 0xff;
buf[4] = (fn >> 0) & 0xff;
/* RSSI */
buf[5] = 0x80;
/* TOA */
buf[6] = (toa_int >> 8) & 0xff;
buf[7] = (toa_int >> 0) & 0xff;
/* Data bits */
for (i=0; i<148; i++)
buf[8+i] = (unsigned char)(127 - ((int)data[i]));
/* End char ? */
buf[9+148] = 0x00;
/* Send result */
send(trx->ofd_data.fd, buf, 158, 0);
return 0;
}

64
src/host/layer23/src/transceiver/trx.h Normal file
View File

@ -0,0 +1,64 @@
/*
* trx.h
*
* OpenBTS TRX interface handling
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TRX_TRX_H__
#define __TRX_TRX_H__
#include <stdint.h>
#include <osmocom/core/bits.h>
#include <osmocom/core/select.h>
#include <osmocom/core/timer.h>
#define ARFCN_INVAL 0xffff
#define BSIC_INVAL 0xff
struct l1ctl_link;
struct trx {
/* UDP sockets */
struct osmo_fd ofd_clk;
struct osmo_fd ofd_ctrl;
struct osmo_fd ofd_data;
/* Link to L1CTL */
struct l1ctl_link *l1l;
/* TRX configuration */
uint16_t arfcn;
uint8_t bsic;
};
struct trx *trx_alloc(const char *addr, uint16_t base_port,
struct l1ctl_link *l1l);
void trx_free(struct trx *trx);
int trx_clk_ind(struct trx *trx, uint32_t fn);
int trx_data_ind(struct trx *trx, uint32_t fn, uint8_t tn, sbit_t *data, float toa);
#endif /* __TRX_TRX_H__ */