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//
// C++ Implementation: gsm_receiver_config
//
// 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
//
//
// Author: Piotr Krysik <perper@o2.pl>, (C) 2009
//
// Copyright: See COPYING file that comes with this distribution
//
//
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gsm_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);
}
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