From 55d1c4d7038045c63f29056adfa0dae220c49439 Mon Sep 17 00:00:00 2001 From: Sylvain Munaut Date: Wed, 16 Jan 2013 22:50:04 +0100 Subject: host/layer23: Initial import of the transceiver application Build is optional because it depends on some extra libraries Signed-off-by: Sylvain Munaut --- src/host/layer23/configure.ac | 8 + .../layer23/include/osmocom/bb/common/logging.h | 2 + src/host/layer23/src/Makefile.am | 4 + src/host/layer23/src/common/logging.c | 12 + src/host/layer23/src/transceiver/LICENSE | 661 +++++++++++++++++++++ src/host/layer23/src/transceiver/Makefile.am | 6 + src/host/layer23/src/transceiver/app.h | 58 ++ src/host/layer23/src/transceiver/burst.h | 43 ++ src/host/layer23/src/transceiver/demod.c | 90 +++ src/host/layer23/src/transceiver/demod.h | 38 ++ src/host/layer23/src/transceiver/gmsk.c | 289 +++++++++ src/host/layer23/src/transceiver/gmsk.h | 82 +++ src/host/layer23/src/transceiver/gsm_ab.c | 105 ++++ src/host/layer23/src/transceiver/gsm_ab.h | 55 ++ src/host/layer23/src/transceiver/l1ctl.c | 363 +++++++++++ src/host/layer23/src/transceiver/l1ctl.h | 49 ++ src/host/layer23/src/transceiver/l1ctl_link.c | 187 ++++++ src/host/layer23/src/transceiver/l1ctl_link.h | 50 ++ src/host/layer23/src/transceiver/main.c | 101 ++++ src/host/layer23/src/transceiver/trx.c | 557 +++++++++++++++++ src/host/layer23/src/transceiver/trx.h | 64 ++ 21 files changed, 2824 insertions(+) create mode 100644 src/host/layer23/src/transceiver/LICENSE create mode 100644 src/host/layer23/src/transceiver/Makefile.am create mode 100644 src/host/layer23/src/transceiver/app.h create mode 100644 src/host/layer23/src/transceiver/burst.h create mode 100644 src/host/layer23/src/transceiver/demod.c create mode 100644 src/host/layer23/src/transceiver/demod.h create mode 100644 src/host/layer23/src/transceiver/gmsk.c create mode 100644 src/host/layer23/src/transceiver/gmsk.h create mode 100644 src/host/layer23/src/transceiver/gsm_ab.c create mode 100644 src/host/layer23/src/transceiver/gsm_ab.h create mode 100644 src/host/layer23/src/transceiver/l1ctl.c create mode 100644 src/host/layer23/src/transceiver/l1ctl.h create mode 100644 src/host/layer23/src/transceiver/l1ctl_link.c create mode 100644 src/host/layer23/src/transceiver/l1ctl_link.h create mode 100644 src/host/layer23/src/transceiver/main.c create mode 100644 src/host/layer23/src/transceiver/trx.c create mode 100644 src/host/layer23/src/transceiver/trx.h diff --git a/src/host/layer23/configure.ac b/src/host/layer23/configure.ac index 9335e66e..1ff1bb70 100644 --- a/src/host/layer23/configure.ac +++ b/src/host/layer23/configure.ac @@ -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 diff --git a/src/host/layer23/include/osmocom/bb/common/logging.h b/src/host/layer23/include/osmocom/bb/common/logging.h index 3efa57a5..2ea83b1e 100644 --- a/src/host/layer23/include/osmocom/bb/common/logging.h +++ b/src/host/layer23/include/osmocom/bb/common/logging.h @@ -22,6 +22,8 @@ enum { DSUM, DSIM, DGPS, + DTRX, + DAPP, }; extern const struct log_info log_info; diff --git a/src/host/layer23/src/Makefile.am b/src/host/layer23/src/Makefile.am index 58a5f7fb..c46548c3 100644 --- a/src/host/layer23/src/Makefile.am +++ b/src/host/layer23/src/Makefile.am @@ -1 +1,5 @@ SUBDIRS = common misc mobile + +if BUILD_TRANSCEIVER +SUBDIRS += transceiver +endif diff --git a/src/host/layer23/src/common/logging.c b/src/host/layer23/src/common/logging.c index d8fd076b..109dc384 100644 --- a/src/host/layer23/src/common/logging.c +++ b/src/host/layer23/src/common/logging.c @@ -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, + }, }; 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +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. + + + Copyright (C) + + 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 . + +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 +. diff --git a/src/host/layer23/src/transceiver/Makefile.am b/src/host/layer23/src/transceiver/Makefile.am new file mode 100644 index 00000000..e40101da --- /dev/null +++ b/src/host/layer23/src/transceiver/Makefile.am @@ -0,0 +1,6 @@ +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 diff --git a/src/host/layer23/src/transceiver/app.h b/src/host/layer23/src/transceiver/app.h new file mode 100644 index 00000000..ba72f266 --- /dev/null +++ b/src/host/layer23/src/transceiver/app.h @@ -0,0 +1,58 @@ +/* + * app.h + * + * Application state / defines + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#ifndef __TRX_APP_H__ +#define __TRX_APP_H__ + + +#include + +#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__ */ diff --git a/src/host/layer23/src/transceiver/burst.h b/src/host/layer23/src/transceiver/burst.h new file mode 100644 index 00000000..47ce1ab3 --- /dev/null +++ b/src/host/layer23/src/transceiver/burst.h @@ -0,0 +1,43 @@ +/* + * burst.h + * + * Burst format + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#ifndef __TRX_BURST_H__ +#define __TRX_BURST_H__ + + +#include + + +#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__ */ diff --git a/src/host/layer23/src/transceiver/demod.c b/src/host/layer23/src/transceiver/demod.c new file mode 100644 index 00000000..45b0570a --- /dev/null +++ b/src/host/layer23/src/transceiver/demod.c @@ -0,0 +1,90 @@ +/* + * demod.c + * + * Demodulation routines for tranceiver + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#include +#include +#include + +#include +#include + +#include + +#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 + * + * 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 . + */ + +#ifndef __TRX_DEMOD_H__ +#define __TRX_DEMOD_H__ + + +#include + +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__ */ diff --git a/src/host/layer23/src/transceiver/gmsk.c b/src/host/layer23/src/transceiver/gmsk.c new file mode 100644 index 00000000..d21819fc --- /dev/null +++ b/src/host/layer23/src/transceiver/gmsk.c @@ -0,0 +1,289 @@ +/* + * gmsk.c + * + * GMSK modulation support + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#include +#include + +#include +#include + +#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; idata[i] = v; + } + + avg = sqrtf(avg); + + for (i=0; idata[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; ilen; i++) + v->data[i] = gs->rot_fwd->data[i] * crealf(v->data[i]); + } else { + for (i=0; ilen; 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; ilen; i++) + v->data[i] = gs->rot_rev->data[i] * crealf(v->data[i]); + } else { + for (i=0; ilen; 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; idata[i] = 0.0f; + + for (i=0; idata[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, >s->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); + } +} diff --git a/src/host/layer23/src/transceiver/gmsk.h b/src/host/layer23/src/transceiver/gmsk.h new file mode 100644 index 00000000..b9ca4e49 --- /dev/null +++ b/src/host/layer23/src/transceiver/gmsk.h @@ -0,0 +1,82 @@ +/* + * gmsk.h + * + * GMSK modulation support + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#ifndef __OSMO_GMSK_H__ +#define __OSMO_GMSK_H__ + + +#include + +#include + +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__ */ diff --git a/src/host/layer23/src/transceiver/gsm_ab.c b/src/host/layer23/src/transceiver/gsm_ab.c new file mode 100644 index 00000000..903a5c3f --- /dev/null +++ b/src/host/layer23/src/transceiver/gsm_ab.c @@ -0,0 +1,105 @@ +/* + * gsm_ab.c + * + * GSM access burst SDR support + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#include +#include +#include + +#include + +#include +#include + +#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; idata[i*gs->sps])); + if (v > 127) + v = 127; + else if (v < -127) + v = -127; + rv[i] = v; + } + + return rv; +} diff --git a/src/host/layer23/src/transceiver/gsm_ab.h b/src/host/layer23/src/transceiver/gsm_ab.h new file mode 100644 index 00000000..dc6eb7de --- /dev/null +++ b/src/host/layer23/src/transceiver/gsm_ab.h @@ -0,0 +1,55 @@ +/* + * gsm_ab.h + * + * GSM access burst SDR support + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#ifndef __OSMO_GSM_AB_H__ +#define __OSMO_GSM_AB_H__ + + +#include + +#include + +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__ */ diff --git a/src/host/layer23/src/transceiver/l1ctl.c b/src/host/layer23/src/transceiver/l1ctl.c new file mode 100644 index 00000000..e4cda24d --- /dev/null +++ b/src/host/layer23/src/transceiver/l1ctl.c @@ -0,0 +1,363 @@ +/* + * l1ctl.c + * + * Minimal L1CTL + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#include +#include + +#include +#include + +#include + +#include +#include + +#include + +#include + +#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; +} diff --git a/src/host/layer23/src/transceiver/l1ctl.h b/src/host/layer23/src/transceiver/l1ctl.h new file mode 100644 index 00000000..da7769d2 --- /dev/null +++ b/src/host/layer23/src/transceiver/l1ctl.h @@ -0,0 +1,49 @@ +/* + * l1ctl.h + * + * Minimal L1CTL + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#ifndef __TRX_L1CTL_H__ +#define __TRX_L1CTL_H__ + + +#include + +#include + +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__ */ diff --git a/src/host/layer23/src/transceiver/l1ctl_link.c b/src/host/layer23/src/transceiver/l1ctl_link.c new file mode 100644 index 00000000..5ec83e42 --- /dev/null +++ b/src/host/layer23/src/transceiver/l1ctl_link.c @@ -0,0 +1,187 @@ +/* + * l1ctl_link.c + * + * L1CTL link handling + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#include +#include +#include + +#include +#include +#include + +#include + +#include + +#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; +} diff --git a/src/host/layer23/src/transceiver/l1ctl_link.h b/src/host/layer23/src/transceiver/l1ctl_link.h new file mode 100644 index 00000000..e53bd829 --- /dev/null +++ b/src/host/layer23/src/transceiver/l1ctl_link.h @@ -0,0 +1,50 @@ +/* + * l1ctl_link.h + * + * L1CTL link handling + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#ifndef __TRX_L1CTL_LINK_H__ +#define __TRX_L1CTL_LINK_H__ + + +#include + + +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__ */ diff --git a/src/host/layer23/src/transceiver/main.c b/src/host/layer23/src/transceiver/main.c new file mode 100644 index 00000000..3b7281dd --- /dev/null +++ b/src/host/layer23/src/transceiver/main.c @@ -0,0 +1,101 @@ +/* + * main.c + * + * Tranceiver main program + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#include +#include + +#include +#include + +#include + +#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; +} diff --git a/src/host/layer23/src/transceiver/trx.c b/src/host/layer23/src/transceiver/trx.c new file mode 100644 index 00000000..9149b7ca --- /dev/null +++ b/src/host/layer23/src/transceiver/trx.c @@ -0,0 +1,557 @@ +/* + * trx.c + * + * OpenBTS TRX interface handling + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + +#include +#include +#include +#include +#include + +#include + +#include + +#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; +} diff --git a/src/host/layer23/src/transceiver/trx.h b/src/host/layer23/src/transceiver/trx.h new file mode 100644 index 00000000..0571cab2 --- /dev/null +++ b/src/host/layer23/src/transceiver/trx.h @@ -0,0 +1,64 @@ +/* + * trx.h + * + * OpenBTS TRX interface handling + * + * Copyright (C) 2013 Sylvain Munaut + * + * 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 . + */ + +#ifndef __TRX_TRX_H__ +#define __TRX_TRX_H__ + + +#include + +#include +#include +#include + + +#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__ */ -- cgit v1.2.3