1 files changed, 100 insertions, 0 deletions
diff --git a/gr-pager/lib/pager_flex_sync.h b/gr-pager/lib/pager_flex_sync.h
new file mode 100644
index 000000000..b401bf532
--- /dev/null
+++ b/gr-pager/lib/pager_flex_sync.h
@@ -0,0 +1,100 @@
+/*
+ * 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 3, 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();
+
+/*!
+ * \brief flex sync description
+ * \ingroup pager_blk
+ */
+
+class pager_flex_sync : public gr_block
+{
+private:
+    // Constructors
+    friend pager_flex_sync_sptr pager_make_flex_sync();
+    pager_flex_sync();
+   
+    // 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_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 */