mirror of https://gerrit.osmocom.org/libosmocore
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/* GSM utility functions, e.g. coding and decoding */
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/*
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* (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de>
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* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef GSM_UTILS_H
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#define GSM_UTILS_H
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#include <stdint.h>
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struct gsm_time {
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uint32_t fn; /* FN count */
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uint16_t t1; /* FN div (26*51) */
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uint8_t t2; /* FN modulo 26 */
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uint8_t t3; /* FN modulo 51 */
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uint8_t tc;
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};
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enum gsm_band {
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GSM_BAND_850 = 1,
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GSM_BAND_900 = 2,
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GSM_BAND_1800 = 4,
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GSM_BAND_1900 = 8,
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GSM_BAND_450 = 0x10,
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GSM_BAND_480 = 0x20,
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GSM_BAND_750 = 0x40,
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GSM_BAND_810 = 0x80,
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};
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char *gsm_band_name(enum gsm_band band);
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enum gsm_band gsm_band_parse(const char *mhz);
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int gsm_7bit_decode(char *decoded, const uint8_t *user_data, uint8_t length);
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int gsm_7bit_encode(uint8_t *result, const char *data);
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int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm);
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int ms_pwr_dbm(enum gsm_band band, uint8_t lvl);
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/* According to TS 08.05 Chapter 8.1.4 */
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int rxlev2dbm(uint8_t rxlev);
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uint8_t dbm2rxlev(int dbm);
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/* According to GSM 04.08 Chapter 10.5.2.29 */
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static inline int rach_max_trans_val2raw(int val) { return (val >> 1) & 3; }
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static inline int rach_max_trans_raw2val(int raw) {
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const int tbl[4] = { 1, 2, 4, 7 };
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return tbl[raw & 3];
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}
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#define ARFCN_PCS 0x8000
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#define ARFCN_UPLINK 0x4000
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enum gsm_band gsm_arfcn2band(uint16_t arfcn);
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/* Convert an ARFCN to the frequency in MHz * 10 */
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uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink);
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/* Convert from frame number to GSM time */
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void gsm_fn2gsmtime(struct gsm_time *time, uint32_t fn);
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/* Convert from GSM time to frame number */
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uint32_t gsm_gsmtime2fn(struct gsm_time *time);
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void generate_backtrace();
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#endif
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