diff options
Diffstat (limited to 'gnuradio-core/src/lib/general')
| -rw-r--r-- | gnuradio-core/src/lib/general/Makefile.am | 3 | ||||
| -rw-r--r-- | gnuradio-core/src/lib/general/general.i | 2 | ||||
| -rw-r--r-- | gnuradio-core/src/lib/general/gr_additive_scrambler_bb.cc | 65 | ||||
| -rw-r--r-- | gnuradio-core/src/lib/general/gr_additive_scrambler_bb.h | 67 | ||||
| -rw-r--r-- | gnuradio-core/src/lib/general/gr_additive_scrambler_bb.i | 31 | ||||
| -rw-r--r-- | gnuradio-core/src/lib/general/gri_lfsr.h | 12 |
6 files changed, 178 insertions, 2 deletions
diff --git a/gnuradio-core/src/lib/general/Makefile.am b/gnuradio-core/src/lib/general/Makefile.am index ecef7d6e3..b5f5c346b 100644 --- a/gnuradio-core/src/lib/general/Makefile.am +++ b/gnuradio-core/src/lib/general/Makefile.am @@ -34,6 +34,7 @@ EXTRA_DIST = \ gr_constants.cc.in libgeneral_la_SOURCES = \ + gr_additive_scrambler_bb.cc \ gr_agc_cc.cc \ gr_agc_ff.cc \ gr_agc2_cc.cc \ @@ -188,6 +189,7 @@ libgeneral_qa_la_SOURCES = \ qa_gri_lfsr.cc grinclude_HEADERS = \ + gr_additive_scrambler_bb.h \ gr_agc_cc.h \ gr_agc_ff.h \ gr_agc2_cc.h \ @@ -360,6 +362,7 @@ noinst_HEADERS = \ if PYTHON swiginclude_HEADERS = \ general.i \ + gr_additive_scrambler_bb.i \ gr_agc_cc.i \ gr_agc_ff.i \ gr_agc2_cc.i \ diff --git a/gnuradio-core/src/lib/general/general.i b/gnuradio-core/src/lib/general/general.i index 2c26b59cd..6929f1e6e 100644 --- a/gnuradio-core/src/lib/general/general.i +++ b/gnuradio-core/src/lib/general/general.i @@ -141,6 +141,7 @@ #include <gr_wvps_ff.h> #include <gr_copy.h> #include <gr_fll_band_edge_cc.h> +#include <gr_additive_scrambler_bb.h> %} %include "gr_nop.i" @@ -262,3 +263,4 @@ %include "gr_wvps_ff.i" %include "gr_copy.i" %include "gr_fll_band_edge_cc.i" +%include "gr_additive_scrambler_bb.i" diff --git a/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.cc b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.cc new file mode 100644 index 000000000..91e02c2d3 --- /dev/null +++ b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.cc @@ -0,0 +1,65 @@ +/* -*- c++ -*- */ +/* + * Copyright 2008,2010 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gr_additive_scrambler_bb.h> +#include <gr_io_signature.h> + +gr_additive_scrambler_bb_sptr +gr_make_additive_scrambler_bb(int mask, int seed, int len, int count) +{ + return gr_additive_scrambler_bb_sptr(new gr_additive_scrambler_bb(mask, seed, len, count)); +} + +gr_additive_scrambler_bb::gr_additive_scrambler_bb(int mask, int seed, int len, int count) + : gr_sync_block("additive_scrambler_bb", + gr_make_io_signature (1, 1, sizeof (unsigned char)), + gr_make_io_signature (1, 1, sizeof (unsigned char))), + d_lfsr(mask, seed, len), + d_count(count), + d_bits(0) +{ +} + +int +gr_additive_scrambler_bb::work(int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items) +{ + const unsigned char *in = (const unsigned char *) input_items[0]; + unsigned char *out = (unsigned char *) output_items[0]; + + for (int i = 0; i < noutput_items; i++) { + out[i] = in[i]^d_lfsr.next_bit(); + if (d_count > 0) { + if (++d_bits == d_count) { + d_lfsr.reset(); + d_bits = 0; + } + } + } + + return noutput_items; +} diff --git a/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.h b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.h new file mode 100644 index 000000000..6c9493050 --- /dev/null +++ b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.h @@ -0,0 +1,67 @@ +/* -*- c++ -*- */ +/* + * Copyright 2008,2010 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ +#ifndef INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H +#define INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H + +#include <gr_sync_block.h> +#include "gri_lfsr.h" + +class gr_additive_scrambler_bb; +typedef boost::shared_ptr<gr_additive_scrambler_bb> gr_additive_scrambler_bb_sptr; + +gr_additive_scrambler_bb_sptr gr_make_additive_scrambler_bb(int mask, int seed, int len, int count=0); + +/*! + * Scramble an input stream using an LFSR. This block works on the LSB only + * of the input data stream, i.e., on an "unpacked binary" stream, and + * produces the same format on its output. + * + * \param mask Polynomial mask for LFSR + * \param seed Initial shift register contents + * \param len Shift register length + * \param count Number of bits after which shift register is reset, 0=never + * + * The scrambler works by XORing the incoming bit stream by the output of + * the LFSR. Optionally, after 'count' bits have been processed, the shift + * register is reset to the seed value. This allows processing fixed length + * vectors of samples. + * + * \ingroup coding_blk + */ + +class gr_additive_scrambler_bb : public gr_sync_block +{ + friend gr_additive_scrambler_bb_sptr gr_make_additive_scrambler_bb(int mask, int seed, int len, int count); + + gri_lfsr d_lfsr; + int d_count; + int d_bits; + + gr_additive_scrambler_bb(int mask, int seed, int len, int count); + +public: + int work(int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items); +}; + +#endif /* INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H */ diff --git a/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.i b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.i new file mode 100644 index 000000000..0ca9c1cd7 --- /dev/null +++ b/gnuradio-core/src/lib/general/gr_additive_scrambler_bb.i @@ -0,0 +1,31 @@ +/* -*- c++ -*- */ +/* + * Copyright 2008,2010 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + +GR_SWIG_BLOCK_MAGIC(gr,additive_scrambler_bb); + +gr_additive_scrambler_bb_sptr gr_make_additive_scrambler_bb(int mask, int seed, int len, int count=0); + +class gr_additive_scrambler_bb : public gr_sync_block +{ +private: + gr_additive_scrambler_bb(int mask, int seed, int len, int count); +}; diff --git a/gnuradio-core/src/lib/general/gri_lfsr.h b/gnuradio-core/src/lib/general/gri_lfsr.h index 715da78a9..f691e36ec 100644 --- a/gnuradio-core/src/lib/general/gri_lfsr.h +++ b/gnuradio-core/src/lib/general/gri_lfsr.h @@ -1,6 +1,6 @@ /* -*- c++ -*- */ /* - * Copyright 2008 Free Software Foundation, Inc. + * Copyright 2008,2010 Free Software Foundation, Inc. * * This file is part of GNU Radio * @@ -86,6 +86,7 @@ class gri_lfsr private: uint32_t d_shift_register; uint32_t d_mask; + uint32_t d_seed; uint32_t d_shift_register_length; // less than 32 static uint32_t @@ -99,7 +100,10 @@ class gri_lfsr public: gri_lfsr(uint32_t mask, uint32_t seed, uint32_t reg_len) - : d_shift_register(seed), d_mask(mask), d_shift_register_length(reg_len) + : d_shift_register(seed), + d_mask(mask), + d_seed(seed), + d_shift_register_length(reg_len) { if (reg_len > 31) throw std::invalid_argument("reg_len must be <= 31"); @@ -126,6 +130,10 @@ class gri_lfsr return output; } + /*! + * Reset shift register to initial seed value + */ + void reset() { d_shift_register = d_seed; } /*! * Rotate the register through x number of bits |