GNU Radio v3.6.2-149-ga6d285d9 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2007,2012 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 00023 #ifndef INCLUDED_GR_GLFSR_SOURCE_B_H 00024 #define INCLUDED_GR_GLFSR_SOURCE_B_H 00025 00026 #include <digital_api.h> 00027 #include <gr_sync_block.h> 00028 00029 class gri_glfsr; 00030 00031 class digital_glfsr_source_b; 00032 typedef boost::shared_ptr<digital_glfsr_source_b> digital_glfsr_source_b_sptr; 00033 00034 DIGITAL_API digital_glfsr_source_b_sptr 00035 digital_make_glfsr_source_b(int degree, bool repeat=true, 00036 int mask=0, int seed=1); 00037 00038 /*! 00039 * \brief Galois LFSR pseudo-random source 00040 * \ingroup source_blk 00041 * 00042 * \param degree Degree of shift register must be in [1, 32]. If mask 00043 * is 0, the degree determines a default mask (see 00044 * digital_impl_glfsr.cc for the mapping). 00045 * \param repeat Set to repeat sequence. 00046 * \param mask Allows a user-defined bit mask for indexes of the shift 00047 * register to feed back. 00048 * \param seed Initial setting for values in shift register. 00049 */ 00050 class DIGITAL_API digital_glfsr_source_b : public gr_sync_block 00051 { 00052 private: 00053 friend DIGITAL_API digital_glfsr_source_b_sptr 00054 digital_make_glfsr_source_b(int degree, bool repeat, 00055 int mask, int seed); 00056 00057 gri_glfsr *d_glfsr; 00058 00059 bool d_repeat; 00060 unsigned int d_index; 00061 unsigned int d_length; 00062 00063 digital_glfsr_source_b(int degree, bool repeat, 00064 int mask, int seed); 00065 00066 public: 00067 00068 ~digital_glfsr_source_b(); 00069 00070 int work(int noutput_items, 00071 gr_vector_const_void_star &input_items, 00072 gr_vector_void_star &output_items); 00073 00074 unsigned int period() const { return d_length; } 00075 int mask() const; 00076 }; 00077 00078 #endif /* INCLUDED_GR_GLFSR_SOURCE_B_H */