| piotr | 437f546 | 2014-02-04 17:57:25 +0100 | [diff] [blame^] | 1 | /* -*- c++ -*- */ |
| 2 | /* |
| 3 | * @file |
| 4 | * @author Piotr Krysik <pkrysik@stud.elka.pw.edu.pl> |
| 5 | * @section LICENSE |
| 6 | * |
| 7 | * GNU Radio is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 3, or (at your option) |
| 10 | * any later version. |
| 11 | * |
| 12 | * GNU Radio is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with GNU Radio; see the file COPYING. If not, write to |
| 19 | * the Free Software Foundation, Inc., 51 Franklin Street, |
| 20 | * Boston, MA 02110-1301, USA. |
| 21 | * |
| 22 | * @section DESCRIPTION |
| 23 | * This file contains classes which define gsm_receiver configuration |
| 24 | * and the burst_counter which is used to store internal state of the receiver |
| 25 | * when it's synchronized |
| 26 | */ |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include "config.h" |
| 29 | #endif |
| 30 | |
| 31 | #include <receiver_config.h> |
| 32 | |
| 33 | burst_counter & burst_counter::operator++(int) |
| 34 | { |
| 35 | d_timeslot_nr++; |
| 36 | if (d_timeslot_nr == TS_PER_FRAME) { |
| 37 | d_timeslot_nr = 0; |
| 38 | |
| 39 | if ((d_t2 == 25) && (d_t3 == 50)) { |
| 40 | d_t1 = (d_t1 + 1) % (1 << 11); |
| 41 | } |
| 42 | |
| 43 | d_t2 = (d_t2 + 1) % 26; |
| 44 | d_t3 = (d_t3 + 1) % 51; |
| 45 | } |
| 46 | |
| 47 | //update offset - this is integer for d_OSR which is multiple of four |
| 48 | d_offset_fractional += GUARD_FRACTIONAL * d_OSR; |
| 49 | d_offset_integer = floor(d_offset_fractional); |
| 50 | d_offset_fractional = d_offset_fractional - d_offset_integer; |
| 51 | return (*this); |
| 52 | } |
| 53 | |
| 54 | void burst_counter::set(uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr) |
| 55 | { |
| 56 | d_t1 = t1; |
| 57 | d_t2 = t2; |
| 58 | d_t3 = t3; |
| 59 | d_timeslot_nr = timeslot_nr; |
| 60 | double first_sample_position = (get_frame_nr() * 8 + timeslot_nr) * TS_BITS; |
| 61 | d_offset_fractional = first_sample_position - floor(first_sample_position); |
| 62 | d_offset_integer = 0; |
| 63 | } |
| 64 | |
| 65 | burst_type channel_configuration::get_burst_type(burst_counter burst_nr) |
| 66 | { |
| 67 | uint32_t timeslot_nr = burst_nr.get_timeslot_nr(); |
| 68 | multiframe_type m_type = d_timeslots_descriptions[timeslot_nr].get_type(); |
| 69 | uint32_t nr; |
| 70 | |
| 71 | switch (m_type) { |
| 72 | case multiframe_26: |
| 73 | nr = burst_nr.get_t2(); |
| 74 | break; |
| 75 | case multiframe_51: |
| 76 | nr = burst_nr.get_t3(); |
| 77 | break; |
| 78 | default: |
| 79 | nr = 0; |
| 80 | break; |
| 81 | } |
| 82 | |
| 83 | return d_timeslots_descriptions[timeslot_nr].get_burst_type(nr); |
| 84 | } |