GNU Radio 3.5.3.2 C++ API
|
00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2004 Free Software Foundation, Inc. 00004 * 00005 * This file is part of GNU Radio 00006 * 00007 * GNU Radio is free software; you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published by 00009 * the Free Software Foundation; either version 3, or (at your option) 00010 * any later version. 00011 * 00012 * GNU Radio is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU General Public License 00018 * along with GNU Radio; see the file COPYING. If not, write to 00019 * the Free Software Foundation, Inc., 51 Franklin Street, 00020 * Boston, MA 02110-1301, USA. 00021 */ 00022 #ifndef INCLUDED_GR_CHECK_LFSR_32K_S_H 00023 #define INCLUDED_GR_CHECK_LFSR_32K_S_H 00024 00025 #include <gr_core_api.h> 00026 #include <gr_sync_block.h> 00027 #include <gri_lfsr_32k.h> 00028 00029 00030 class gr_check_lfsr_32k_s; 00031 typedef boost::shared_ptr<gr_check_lfsr_32k_s> gr_check_lfsr_32k_s_sptr; 00032 00033 GR_CORE_API gr_check_lfsr_32k_s_sptr gr_make_check_lfsr_32k_s (); 00034 00035 /*! 00036 * \brief sink that checks if its input stream consists of a lfsr_32k sequence. 00037 * \ingroup sink_blk 00038 * 00039 * This sink is typically used along with gr_lfsr_32k_source_s to test 00040 * the USRP using its digital loopback mode. 00041 */ 00042 class GR_CORE_API gr_check_lfsr_32k_s : public gr_sync_block 00043 { 00044 friend GR_CORE_API gr_check_lfsr_32k_s_sptr gr_make_check_lfsr_32k_s (); 00045 00046 enum state { 00047 SEARCHING, // searching for synchronization 00048 MATCH0, 00049 MATCH1, 00050 MATCH2, 00051 LOCKED // is locked 00052 }; 00053 00054 state d_state; 00055 unsigned int d_history; // bitmask of decisions 00056 00057 long d_ntotal; // total number of shorts 00058 long d_nright; // # of correct shorts 00059 long d_runlength; // # of correct shorts in a row 00060 00061 static const int BUFSIZE = 2048 - 1; // ensure pattern isn't packet aligned 00062 int d_index; 00063 unsigned short d_buffer[BUFSIZE]; 00064 00065 00066 gr_check_lfsr_32k_s (); 00067 00068 void enter_SEARCHING (); 00069 void enter_MATCH0 (); 00070 void enter_MATCH1 (); 00071 void enter_MATCH2 (); 00072 void enter_LOCKED (); 00073 00074 void right (){ 00075 d_history = (d_history << 1) | 0x1; 00076 d_nright++; 00077 d_runlength++; 00078 } 00079 00080 void wrong (){ 00081 d_history = (d_history << 1) | 0x0; 00082 d_runlength = 0; 00083 } 00084 00085 bool right_three_times () { return (d_history & 0x7) == 0x7; } 00086 bool wrong_three_times () { return (d_history & 0x7) == 0x0; } 00087 00088 void log_error (unsigned short expected, unsigned short actual); 00089 00090 public: 00091 00092 int work (int noutput_items, 00093 gr_vector_const_void_star &input_items, 00094 gr_vector_void_star &output_items); 00095 00096 long ntotal () const { return d_ntotal; } 00097 long nright () const { return d_nright; } 00098 long runlength () const { return d_runlength; } 00099 00100 }; 00101 00102 00103 #endif /* INCLUDED_GR_CHECK_LFSR_32K_S_H */