GNU Radio 3.6.5.1 C++ API
pager_flex_sync.h
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1 /*
2  * Copyright 2006 Free Software Foundation, Inc.
3  *
4  * This file is part of GNU Radio
5  *
6  * GNU Radio is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 3, or (at your option)
9  * any later version.
10  *
11  * GNU Radio is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with GNU Radio; see the file COPYING. If not, write to
18  * the Free Software Foundation, Inc., 51 Franklin Street,
19  * Boston, MA 02110-1301, USA.
20  */
21 
22 #ifndef INCLUDED_PAGER_FLEX_SYNC_H
23 #define INCLUDED_PAGER_FLEX_SYNC_H
24 
25 #include <pager_api.h>
26 #include <gr_block.h>
27 
28 class pager_flex_sync;
30 typedef std::vector<gr_int64> gr_int64_vector;
31 
33 
34 /*!
35  * \brief flex sync description
36  * \ingroup pager_blk
37  */
39 {
40 private:
41  // Constructors
44 
45  // State machine transitions
46  void enter_idle();
47  void enter_syncing();
48  void enter_sync1();
49  void enter_sync2();
50  void enter_data();
51 
52  int index_avg(int start, int end);
53  bool test_sync(unsigned char sym);
54  void parse_fiw();
55  int output_symbol(unsigned char sym);
56 
57  // Simple state machine
58  enum state_t { ST_IDLE, ST_SYNCING, ST_SYNC1, ST_SYNC2, ST_DATA };
59  state_t d_state;
60 
61  int d_index; // Index into current baud
62  int d_start; // Start of good sync
63  int d_center; // Center of bit
64  int d_end; // End of good sync
65  int d_count; // Bit counter
66 
67  int d_mode; // Current packet mode
68  int d_baudrate; // Current decoding baud rate
69  int d_levels; // Current decoding levels
70  int d_spb; // Current samples per baud
71  bool d_hibit; // Alternating bit indicator for 3200 bps
72 
73  gr_int32 d_fiw; // Frame information word
74  int d_frame; // Current FLEX frame
75  int d_cycle; // Current FLEX cycle
76  int d_unknown1;
77  int d_unknown2;
78 
79  unsigned char d_bit_a;
80  unsigned char d_bit_b;
81  unsigned char d_bit_c;
82  unsigned char d_bit_d;
83 
84  unsigned char *d_phase_a;
85  unsigned char *d_phase_b;
86  unsigned char *d_phase_c;
87  unsigned char *d_phase_d;
88 
89  gr_int64_vector d_sync; // Trial synchronizers
90 
91 public:
92  void forecast(int noutput_items, gr_vector_int &inputs_required);
93 
94  int general_work(int noutput_items,
95  gr_vector_int &ninput_items,
96  gr_vector_const_void_star &input_items,
97  gr_vector_void_star &output_items);
98 };
99 
100 #endif /* INCLUDED_PAGER_FLEX_SYNC_H */