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authorpiotr <Piotr Krysik pkrysik@elka.pw.edu.pl>2014-04-17 11:09:30 +0200
committerpiotr <Piotr Krysik pkrysik@elka.pw.edu.pl>2014-04-17 11:09:30 +0200
commitd77c9cf983530d12ca535da4231269c0967553e4 (patch)
treedabddddd873731461d8451f3eae29098fab3d229 /lib
parentbf2d9a477bbd1362e23d7c17a42984466c54fc60 (diff)
Added block filtering bursts containing full CCH messages
Diffstat (limited to 'lib')
-rw-r--r--lib/CMakeLists.txt1
-rw-r--r--lib/get_ccch_bursts_impl.cc101
-rw-r--r--lib/get_ccch_bursts_impl.h42
3 files changed, 144 insertions, 0 deletions
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 8899310..38539da 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -31,6 +31,7 @@ list(APPEND gsm_sources
viterbi_detector.cc
sch.c
bursts_printer_impl.cc
+ get_ccch_bursts_impl.cc
)
add_library(gnuradio-gsm SHARED ${gsm_sources})
diff --git a/lib/get_ccch_bursts_impl.cc b/lib/get_ccch_bursts_impl.cc
new file mode 100644
index 0000000..249c271
--- /dev/null
+++ b/lib/get_ccch_bursts_impl.cc
@@ -0,0 +1,101 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 <perper@o2.pl>.
+ *
+ * This 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.
+ *
+ * This software 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 this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "get_ccch_bursts_impl.h"
+#include <gsmtap.h>
+
+namespace gr {
+ namespace gsm {
+
+ void get_ccch_bursts_impl::filter_ccch(pmt::pmt_t msg)
+ {
+ pmt::pmt_t header_blob = pmt::car(msg);
+ pmt::pmt_t content = pmt::cdr(msg);
+ gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_blob);
+ uint32_t frame_nr = header->frame_number;
+ pmt::pmt_t msgs[4];
+ uint32_t frame_numbers[4];
+
+ if(header->timeslot==0){
+ std::cout << (header->frame_number % 51) << std::endl;
+ if((header->frame_number % 51)>=2 & (header->frame_number % 51)<=5){
+ uint32_t ii = header->frame_number-2;
+ frame_numbers[ii]=header->frame_number;
+ msgs[ii] = msg;
+// std::cout << "Hura, pierwszy if" << std::endl;
+ }
+
+ if((header->frame_number % 51)==5){
+ //check for a situation where some BCCH bursts were lost
+ //in this situation frame numbers won't be consecutive
+ bool frames_are_consecutive = true;
+ for(int jj=1;jj<4;jj++){
+ if((frame_numbers[jj]-frame_numbers[jj-1])!=1){
+ frames_are_consecutive = false;
+ }
+ }
+ std::cout << "Hura, durgi if" << std::endl;
+ if(frames_are_consecutive){
+ //send bursts to the output
+ std::cout << "Hura, trzeci if" << std::endl;
+
+ for(int jj=1;jj<4;jj++){
+// message_port_pub(pmt::mp("bursts_out"), msgs[jj]);
+ }
+ }
+ }
+ }
+ }
+
+ get_ccch_bursts::sptr
+ get_ccch_bursts::make()
+ {
+ return gnuradio::get_initial_sptr
+ (new get_ccch_bursts_impl());
+ }
+
+ /*
+ * The private constructor
+ */
+ get_ccch_bursts_impl::get_ccch_bursts_impl()
+ : gr::block("get_ccch_bursts",
+ gr::io_signature::make(0, 0, 0),
+ gr::io_signature::make(0, 0, 0))
+ {
+ message_port_register_in(pmt::mp("bursts_in"));
+ set_msg_handler(pmt::mp("bursts_in"), boost::bind(&get_ccch_bursts_impl::filter_ccch, this, _1));
+ message_port_register_out(pmt::mp("bursts_out"));
+ }
+
+ /*
+ * Our virtual destructor.
+ */
+ get_ccch_bursts_impl::~get_ccch_bursts_impl()
+ {
+ }
+
+ } /* namespace gsm */
+} /* namespace gr */
+
diff --git a/lib/get_ccch_bursts_impl.h b/lib/get_ccch_bursts_impl.h
new file mode 100644
index 0000000..992b181
--- /dev/null
+++ b/lib/get_ccch_bursts_impl.h
@@ -0,0 +1,42 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 <+YOU OR YOUR COMPANY+>.
+ *
+ * This 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.
+ *
+ * This software 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 this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GSM_GET_CCCH_BURSTS_IMPL_H
+#define INCLUDED_GSM_GET_CCCH_BURSTS_IMPL_H
+
+#include <gsm/get_ccch_bursts.h>
+#include <receiver_config.h>
+
+namespace gr {
+ namespace gsm {
+
+ class get_ccch_bursts_impl : public get_ccch_bursts
+ {
+ public:
+ get_ccch_bursts_impl();
+ ~get_ccch_bursts_impl();
+ void filter_ccch(pmt::pmt_t msg);
+ };
+
+ } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_GET_CCCH_BURSTS_IMPL_H */
+