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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