1 /* -*- c++ -*- */ 2 /* 3 * Copyright 2007,2012,2016 Free Software Foundation, Inc. 4 * 5 * This file is part of GNU Radio 6 * 7 * GNU Radio is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 3, or (at your option) 10 * any later version. 11 * 12 * GNU Radio is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with GNU Radio; see the file COPYING. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, 20 * Boston, MA 02110-1301, USA. 21 */ 22 23 #ifndef INCLUDED_DIGITAL_GLFSR_H 24 #define INCLUDED_DIGITAL_GLFSR_H 25 26 #include <gnuradio/digital/api.h> 27 #include <boost/cstdint.hpp> 28 29 namespace gr { 30 namespace digital { 31 32 /*! 33 * \brief Galois Linear Feedback Shift Register using specified polynomial mask 34 * \ingroup waveform_generators_blk 35 * 36 * \details 37 * Generates a maximal length pseudo-random sequence of length 2^degree-1 38 */ 39 class DIGITAL_API glfsr 40 { 41 private: 42 uint32_t d_shift_register; 43 uint32_t d_mask; 44 45 public: glfsr(uint32_t mask,uint32_t seed)46 glfsr(uint32_t mask, uint32_t seed) 47 { 48 d_shift_register = seed; 49 d_mask = mask; 50 } 51 ~glfsr(); 52 53 static uint32_t glfsr_mask(unsigned int degree); 54 55 uint8_t next_bit(); 56 mask()57 uint32_t mask() const { return d_mask; } 58 }; 59 60 } /* namespace digital */ 61 } /* namespace gr */ 62 63 #endif /* INCLUDED_DIGITAL_GLFSR_H */ 64