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Diffstat (limited to 'lib/receiver_config.cc')
-rw-r--r-- | lib/receiver_config.cc | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/lib/receiver_config.cc b/lib/receiver_config.cc new file mode 100644 index 0000000..c7c996e --- /dev/null +++ b/lib/receiver_config.cc @@ -0,0 +1,84 @@ +/* -*- c++ -*- */ +/* + * @file + * @author Piotr Krysik <pkrysik@stud.elka.pw.edu.pl> + * @section LICENSE + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + * + * @section DESCRIPTION + * This file contains classes which define gsm_receiver configuration + * and the burst_counter which is used to store internal state of the receiver + * when it's synchronized + */ +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <receiver_config.h> + +burst_counter & burst_counter::operator++(int) +{ + d_timeslot_nr++; + if (d_timeslot_nr == TS_PER_FRAME) { + d_timeslot_nr = 0; + + if ((d_t2 == 25) && (d_t3 == 50)) { + d_t1 = (d_t1 + 1) % (1 << 11); + } + + d_t2 = (d_t2 + 1) % 26; + d_t3 = (d_t3 + 1) % 51; + } + + //update offset - this is integer for d_OSR which is multiple of four + d_offset_fractional += GUARD_FRACTIONAL * d_OSR; + d_offset_integer = floor(d_offset_fractional); + d_offset_fractional = d_offset_fractional - d_offset_integer; + return (*this); +} + +void burst_counter::set(uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr) +{ + d_t1 = t1; + d_t2 = t2; + d_t3 = t3; + d_timeslot_nr = timeslot_nr; + double first_sample_position = (get_frame_nr() * 8 + timeslot_nr) * TS_BITS; + d_offset_fractional = first_sample_position - floor(first_sample_position); + d_offset_integer = 0; +} + +burst_type channel_configuration::get_burst_type(burst_counter burst_nr) +{ + uint32_t timeslot_nr = burst_nr.get_timeslot_nr(); + multiframe_type m_type = d_timeslots_descriptions[timeslot_nr].get_type(); + uint32_t nr; + + switch (m_type) { + case multiframe_26: + nr = burst_nr.get_t2(); + break; + case multiframe_51: + nr = burst_nr.get_t3(); + break; + default: + nr = 0; + break; + } + + return d_timeslots_descriptions[timeslot_nr].get_burst_type(nr); +} |