gr_constants.cc.in
libgeneral_la_SOURCES = \
+ gr_additive_scrambler_bb.cc \
gr_agc_cc.cc \
gr_agc_ff.cc \
gr_agc2_cc.cc \
qa_gri_lfsr.cc
grinclude_HEADERS = \
+ gr_additive_scrambler_bb.h \
gr_agc_cc.h \
gr_agc_ff.h \
gr_agc2_cc.h \
if PYTHON
swiginclude_HEADERS = \
general.i \
+ gr_additive_scrambler_bb.i \
gr_agc_cc.i \
gr_agc_ff.i \
gr_agc2_cc.i \
#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"
%include "gr_wvps_ff.i"
%include "gr_copy.i"
%include "gr_fll_band_edge_cc.i"
+%include "gr_additive_scrambler_bb.i"
--- /dev/null
+/* -*- 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;
+}
--- /dev/null
+/* -*- 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 */
--- /dev/null
+/* -*- 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);
+};
/* -*- c++ -*- */
/*
- * Copyright 2008 Free Software Foundation, Inc.
+ * Copyright 2008,2010 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
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
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");
return output;
}
+ /*!
+ * Reset shift register to initial seed value
+ */
+ void reset() { d_shift_register = d_seed; }
/*!
* Rotate the register through x number of bits
self.tb.run()
self.assertEqual(tuple(src_data[:-8]), dst.data()[8:]) # skip garbage during synchronization
+ def test_additive_scrambler(self):
+ src_data = (1,)*1000
+ src = gr.vector_source_b(src_data, False)
+ scrambler = gr.additive_scrambler_bb(0x8a, 0x7f, 7)
+ descrambler = gr.additive_scrambler_bb(0x8a, 0x7f, 7)
+ dst = gr.vector_sink_b()
+ self.tb.connect(src, scrambler, descrambler, dst)
+ self.tb.run()
+ self.assertEqual(src_data, dst.data())
+
+ def test_additive_scrambler_reset(self):
+ src_data = (1,)*1000
+ src = gr.vector_source_b(src_data, False)
+ scrambler = gr.additive_scrambler_bb(0x8a, 0x7f, 7, 100)
+ descrambler = gr.additive_scrambler_bb(0x8a, 0x7f, 7, 100)
+ dst = gr.vector_sink_b()
+ self.tb.connect(src, scrambler, descrambler, dst)
+ self.tb.run()
+ self.assertEqual(src_data, dst.data())
+
if __name__ == '__main__':
gr_unittest.main ()
const_source_x.xml \
gr_add_const_vxx.xml \
gr_add_xx.xml \
+ gr_additive_scrambler_bb.xml \
gr_agc2_xx.xml \
gr_agc_xx.xml \
gr_and_xx.xml \
<name>Line Coding</name>
<block>gr_scrambler_bb</block>
<block>gr_descrambler_bb</block>
+ <block>gr_additive_scrambler_bb</block>
</cat>
<cat>
<name>Vocoders</name>
--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+## Additive Scrambler
+###################################################
+ -->
+<block>
+ <name>Additive Scrambler</name>
+ <key>gr_additive_scrambler_bb</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.additive_scrambler_bb($mask, $seed, $len, $count)</make>
+ <param>
+ <name>Mask</name>
+ <key>mask</key>
+ <value>0x8A</value>
+ <type>hex</type>
+ </param>
+ <param>
+ <name>Seed</name>
+ <key>seed</key>
+ <value>0x7F</value>
+ <type>hex</type>
+ </param>
+ <param>
+ <name>Length</name>
+ <key>len</key>
+ <value>7</value>
+ <type>int</type>
+ </param>
+ <param>
+ <name>Count</name>
+ <key>count</key>
+ <value>0</value>
+ <type>int</type>
+ </param>
+ <sink>
+ <name>in</name>
+ <type>byte</type>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>byte</type>
+ </source>
+</block>
projects / debian / gnuradio / commitdiff