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00022 #ifndef INCLUDED_GR_CHECK_LFSR_32K_S_H
00023 #define INCLUDED_GR_CHECK_LFSR_32K_S_H
00024 
00025 #include <gr_sync_block.h>
00026 #include <gri_lfsr_32k.h>
00027 
00028 
00029 class gr_check_lfsr_32k_s;
00030 typedef boost::shared_ptr<gr_check_lfsr_32k_s> gr_check_lfsr_32k_s_sptr;
00031 
00032 gr_check_lfsr_32k_s_sptr gr_make_check_lfsr_32k_s ();
00033 
00041 class gr_check_lfsr_32k_s : public gr_sync_block
00042 {
00043   friend gr_check_lfsr_32k_s_sptr gr_make_check_lfsr_32k_s ();
00044 
00045   enum state {
00046     SEARCHING,          
00047     MATCH0,
00048     MATCH1,
00049     MATCH2,
00050     LOCKED              
00051   };
00052 
00053   state                 d_state;
00054   unsigned int          d_history;              
00055   
00056   long                  d_total_errors;
00057   long                  d_total_shorts;
00058 
00059   static const int BUFSIZE = 2048;
00060   int                   d_index;
00061   unsigned short        d_buffer[BUFSIZE];
00062 
00063 
00064   gr_check_lfsr_32k_s ();
00065   
00066   void enter_SEARCHING ();
00067   void enter_MATCH0 ();
00068   void enter_MATCH1 ();
00069   void enter_MATCH2 ();
00070   void enter_LOCKED ();
00071 
00072   void right (){
00073     d_history = (d_history << 1) | 0x1;
00074   }
00075   
00076   void wrong (){
00077     d_history = (d_history << 1) | 0x0;
00078   }
00079 
00080   bool right_three_times () { return (d_history & 0x7) == 0x7; }
00081   bool wrong_three_times () { return (d_history & 0x7) == 0x0; }
00082 
00083   void log_error (unsigned short expected, unsigned short actual);
00084 
00085  public:
00086 
00087   int work (int noutput_items,
00088             gr_vector_const_void_star &input_items,
00089             gr_vector_void_star &output_items);
00090 };
00091 
00092 
00093 #endif