From d77c9cf983530d12ca535da4231269c0967553e4 Mon Sep 17 00:00:00 2001 From: piotr Date: Thu, 17 Apr 2014 11:09:30 +0200 Subject: Added block filtering bursts containing full CCH messages --- lib/CMakeLists.txt | 1 + lib/get_ccch_bursts_impl.cc | 101 ++++++++++++++++++++++++++++++++++++++++++++ lib/get_ccch_bursts_impl.h | 42 ++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 lib/get_ccch_bursts_impl.cc create mode 100644 lib/get_ccch_bursts_impl.h (limited to 'lib') 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 . + * + * 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 +#include "get_ccch_bursts_impl.h" +#include + +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 +#include + +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 */ + -- cgit v1.2.3