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Diffstat (limited to 'gr-pager/src/pager_flex_sync.h')
| -rw-r--r-- | gr-pager/src/pager_flex_sync.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/gr-pager/src/pager_flex_sync.h b/gr-pager/src/pager_flex_sync.h new file mode 100644 index 000000000..813b7cf26 --- /dev/null +++ b/gr-pager/src/pager_flex_sync.h @@ -0,0 +1,101 @@ +/* + * Copyright 2006 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio 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 2, or (at your option) + * any later version. + * + * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + +#ifndef INCLUDED_PAGER_FLEX_SYNC_H +#define INCLUDED_PAGER_FLEX_SYNC_H + +#include <gr_block.h> + +class pager_flex_sync; +typedef boost::shared_ptr<pager_flex_sync> pager_flex_sync_sptr; +typedef std::vector<gr_int64> gr_int64_vector; + +pager_flex_sync_sptr pager_make_flex_sync(int rate); + +/*! + * \brief flex sync description + * \ingroup block + */ + +class pager_flex_sync : public gr_block +{ +private: + // Constructors + friend pager_flex_sync_sptr pager_make_flex_sync(int rate); + pager_flex_sync(int rate); + + // State machine transitions + void enter_idle(); + void enter_syncing(); + void enter_sync1(); + void enter_sync2(); + void enter_data(); + + int index_avg(int start, int end); + bool test_sync(unsigned char sym); + void parse_fiw(); + int output_symbol(unsigned char sym); + + // Simple state machine + enum state_t { ST_IDLE, ST_SYNCING, ST_SYNC1, ST_SYNC2, ST_DATA }; + state_t d_state; + + int d_rate; // Incoming sample rate + int d_index; // Index into current baud + int d_start; // Start of good sync + int d_center; // Center of bit + int d_end; // End of good sync + int d_count; // Bit counter + + int d_mode; // Current packet mode + int d_baudrate; // Current decoding baud rate + int d_levels; // Current decoding levels + int d_spb; // Current samples per baud + bool d_hibit; // Alternating bit indicator for 3200 bps + + gr_int32 d_fiw; // Frame information word + int d_frame; // Current FLEX frame + int d_cycle; // Current FLEX cycle + int d_unknown1; + int d_unknown2; + + unsigned char d_bit_a; + unsigned char d_bit_b; + unsigned char d_bit_c; + unsigned char d_bit_d; + + unsigned char *d_phase_a; + unsigned char *d_phase_b; + unsigned char *d_phase_c; + unsigned char *d_phase_d; + + gr_int64_vector d_sync; // Trial synchronizers + +public: + void forecast(int noutput_items, gr_vector_int &inputs_required); + + int general_work(int noutput_items, + gr_vector_int &ninput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items); +}; + +#endif /* INCLUDED_PAGER_FLEX_SYNC_H */ |