GNU Radio 3.4.2 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2005,2006,2011 Free Software Foundation, Inc. 00004 * 00005 * This file is part of GNU Radio 00006 * 00007 * GNU Radio is free software; you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published by 00009 * the Free Software Foundation; either version 3, or (at your option) 00010 * any later version. 00011 * 00012 * GNU Radio is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU General Public License 00018 * along with GNU Radio; see the file COPYING. If not, write to 00019 * the Free Software Foundation, Inc., 51 Franklin Street, 00020 * Boston, MA 02110-1301, USA. 00021 */ 00022 00023 #ifndef INCLUDED_gr_correlate_access_code_tag_bb_H 00024 #define INCLUDED_gr_correlate_access_code_tag_bb_H 00025 00026 #include <gr_sync_block.h> 00027 #include <string> 00028 00029 class gr_correlate_access_code_tag_bb; 00030 typedef boost::shared_ptr<gr_correlate_access_code_tag_bb> gr_correlate_access_code_tag_bb_sptr; 00031 00032 /*! 00033 * \param access_code is represented with 1 byte per bit, e.g., "010101010111000100" 00034 * \param threshold maximum number of bits that may be wrong 00035 * \param tag_name key of the tag inserted into the tag stream 00036 */ 00037 gr_correlate_access_code_tag_bb_sptr 00038 gr_make_correlate_access_code_tag_bb (const std::string &access_code, int threshold, 00039 const std::string &tag_name); 00040 00041 /*! 00042 * \brief Examine input for specified access code, one bit at a time. 00043 * \ingroup sync_blk 00044 * 00045 * input: stream of bits, 1 bit per input byte (data in LSB) 00046 * output: unaltered stream of bits (plus tags) 00047 * 00048 * This block annotates the input stream with tags. The tags have key 00049 * name [tag_name], specified in the constructor. Used for searching 00050 * an input data stream for preambles, etc. 00051 */ 00052 class gr_correlate_access_code_tag_bb : public gr_sync_block 00053 { 00054 friend gr_correlate_access_code_tag_bb_sptr 00055 gr_make_correlate_access_code_tag_bb (const std::string &access_code, int threshold, 00056 const std::string &tag_name); 00057 private: 00058 unsigned long long d_access_code; // access code to locate start of packet 00059 // access code is left justified in the word 00060 unsigned long long d_data_reg; // used to look for access_code 00061 unsigned long long d_mask; // masks access_code bits (top N bits are set where 00062 // N is the number of bits in the access code) 00063 unsigned int d_threshold; // how many bits may be wrong in sync vector 00064 unsigned int d_len; //the length of the access code 00065 00066 pmt::pmt_t d_key, d_me; //d_key is the tag name, d_me is the block name + unique ID 00067 00068 protected: 00069 gr_correlate_access_code_tag_bb(const std::string &access_code, int threshold, 00070 const std::string &tag_name); 00071 00072 public: 00073 ~gr_correlate_access_code_tag_bb(); 00074 00075 int work(int noutput_items, 00076 gr_vector_const_void_star &input_items, 00077 gr_vector_void_star &output_items); 00078 00079 00080 /*! 00081 * \param access_code is represented with 1 byte per bit, e.g., "010101010111000100" 00082 */ 00083 bool set_access_code (const std::string &access_code); 00084 }; 00085 00086 #endif /* INCLUDED_gr_correlate_access_code_tag_bb_H */