2 * Copyright 2006 Free Software Foundation, Inc.
4 * This file is part of GNU Radio
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 2, or (at your option)
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.
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.
22 #ifndef INCLUDED_PAGER_FLEX_DEFRAMER_H
23 #define INCLUDED_PAGER_FLEX_DEFRAMER_H
27 class pager_flex_deframer;
28 typedef boost::shared_ptr<pager_flex_deframer> pager_flex_deframer_sptr;
29 typedef std::vector<gr_int64> gr_int64_vector;
31 pager_flex_deframer_sptr pgr_make_flex_deframer(int rate);
34 * \brief flex deframer description
38 class pager_flex_deframer : public gr_block
42 friend pager_flex_deframer_sptr pager_make_flex_deframer(int rate);
43 pager_flex_deframer(int rate);
45 // State machine transitions
53 int index_avg(int start, int end);
54 bool test_sync(unsigned char sym);
55 void accumulate_frames(unsigned char sym);
56 void output_codeword(gr_int32 *out);
58 // Simple state machine
59 enum state_t { ST_IDLE, ST_SYNCING, ST_SYNC1, ST_SYNC2, ST_DATA, ST_OUTPUT };
62 int d_rate; // Incoming sample rate
63 int d_index; // Index into current baud
64 int d_start; // Start of good sync
65 int d_center; // Center of bit
66 int d_end; // End of good sync
67 int d_count; // Bit counter
69 int d_mode; // Current packet mode
70 int d_baudrate; // Current decoding baud rate
71 int d_levels; // Current decoding levels
72 int d_spb; // Current samples per baud
73 bool d_hibit; // Current bit is high bit when 3200 baud
75 gr_int64_vector d_sync; // Trial synchronizers
77 int d_cdi; // 0-7 code word index for deinterleave
78 int d_cdw; // 0-87 code word index for frame
79 int d_blk; // 0-10 block index
81 int d_output_phase; // Indexes d_frames[][] during output
82 int d_output_index; // indexes d_frames[][] during output
84 gr_int32 d_frames[4][88]; // Frame accumulators for each phase
87 void forecast(int noutput_items, gr_vector_int &inputs_required);
89 int general_work(int noutput_items,
90 gr_vector_int &ninput_items,
91 gr_vector_const_void_star &input_items,
92 gr_vector_void_star &output_items);
95 #endif /* INCLUDED_PAGER_FLEX_DEFRAMER_H */