GNU Radio 3.4.0 C++ API
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00001 /* 00002 * Copyright 2006 Free Software Foundation, Inc. 00003 * 00004 * This file is part of GNU Radio 00005 * 00006 * GNU Radio is free software; you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation; either version 3, or (at your option) 00009 * any later version. 00010 * 00011 * GNU Radio is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with GNU Radio; see the file COPYING. If not, write to 00018 * the Free Software Foundation, Inc., 51 Franklin Street, 00019 * Boston, MA 02110-1301, USA. 00020 */ 00021 00022 #ifndef INCLUDED_PAGER_FLEX_SYNC_H 00023 #define INCLUDED_PAGER_FLEX_SYNC_H 00024 00025 #include <gr_block.h> 00026 00027 class pager_flex_sync; 00028 typedef boost::shared_ptr<pager_flex_sync> pager_flex_sync_sptr; 00029 typedef std::vector<gr_int64> gr_int64_vector; 00030 00031 pager_flex_sync_sptr pager_make_flex_sync(); 00032 00033 /*! 00034 * \brief flex sync description 00035 * \ingroup pager_blk 00036 */ 00037 00038 class pager_flex_sync : public gr_block 00039 { 00040 private: 00041 // Constructors 00042 friend pager_flex_sync_sptr pager_make_flex_sync(); 00043 pager_flex_sync(); 00044 00045 // State machine transitions 00046 void enter_idle(); 00047 void enter_syncing(); 00048 void enter_sync1(); 00049 void enter_sync2(); 00050 void enter_data(); 00051 00052 int index_avg(int start, int end); 00053 bool test_sync(unsigned char sym); 00054 void parse_fiw(); 00055 int output_symbol(unsigned char sym); 00056 00057 // Simple state machine 00058 enum state_t { ST_IDLE, ST_SYNCING, ST_SYNC1, ST_SYNC2, ST_DATA }; 00059 state_t d_state; 00060 00061 int d_index; // Index into current baud 00062 int d_start; // Start of good sync 00063 int d_center; // Center of bit 00064 int d_end; // End of good sync 00065 int d_count; // Bit counter 00066 00067 int d_mode; // Current packet mode 00068 int d_baudrate; // Current decoding baud rate 00069 int d_levels; // Current decoding levels 00070 int d_spb; // Current samples per baud 00071 bool d_hibit; // Alternating bit indicator for 3200 bps 00072 00073 gr_int32 d_fiw; // Frame information word 00074 int d_frame; // Current FLEX frame 00075 int d_cycle; // Current FLEX cycle 00076 int d_unknown1; 00077 int d_unknown2; 00078 00079 unsigned char d_bit_a; 00080 unsigned char d_bit_b; 00081 unsigned char d_bit_c; 00082 unsigned char d_bit_d; 00083 00084 unsigned char *d_phase_a; 00085 unsigned char *d_phase_b; 00086 unsigned char *d_phase_c; 00087 unsigned char *d_phase_d; 00088 00089 gr_int64_vector d_sync; // Trial synchronizers 00090 00091 public: 00092 void forecast(int noutput_items, gr_vector_int &inputs_required); 00093 00094 int general_work(int noutput_items, 00095 gr_vector_int &ninput_items, 00096 gr_vector_const_void_star &input_items, 00097 gr_vector_void_star &output_items); 00098 }; 00099 00100 #endif /* INCLUDED_PAGER_FLEX_SYNC_H */