1 files changed, 84 insertions, 0 deletions
diff --git a/gsm-receiver/src/lib/gsm_receiver_config.cc b/gsm-receiver/src/lib/gsm_receiver_config.cc
new file mode 100644
index 0000000..44344f7
--- /dev/null
+++ b/gsm-receiver/src/lib/gsm_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 <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);
+}