From e09ae11f04130d2666ffb5442cb8ce204e3ac3d8 Mon Sep 17 00:00:00 2001
From: Piotr Krysik <perper@o2.pl>
Date: Sat, 6 Jun 2009 23:10:21 +0200
Subject: next code cleanup, two functions introduced, should be removed before
 the end of this branch

---
 src/lib/gsm_receiver_config.cc | 63 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 62 insertions(+), 1 deletion(-)

(limited to 'src/lib/gsm_receiver_config.cc')

diff --git a/src/lib/gsm_receiver_config.cc b/src/lib/gsm_receiver_config.cc
index 1d4cf1d..1eaff7f 100644
--- a/src/lib/gsm_receiver_config.cc
+++ b/src/lib/gsm_receiver_config.cc
@@ -1,7 +1,10 @@
 //
 // C++ Implementation: gsm_receiver_config
 //
-// Description: 
+// 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
@@ -9,3 +12,61 @@
 // 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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