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#!/usr/bin/env python
#
# Copyright 2008,2010,2012,2013 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.
#
from gnuradio import gr, gr_unittest, digital, blocks
import pmt
# See gr-digital/lib/additive_scrambler_bb_impl.cc for reference.
def additive_scramble_lfsr(mask, seed, reglen, bpb, data):
l = digital.lfsr(mask, seed, reglen)
out = []
for d in data:
scramble_word = 0
for i in range(0,bpb):
scramble_word ^= l.next_bit() << i
out.append(d ^ scramble_word)
return tuple(out)
class test_scrambler(gr_unittest.TestCase):
def setUp(self):
self.tb = gr.top_block()
def tearDown(self):
self.tb = None
def test_scrambler_descrambler(self):
src_data = (1,)*1000
src = blocks.vector_source_b(src_data, False)
scrambler = digital.scrambler_bb(0x8a, 0x7F, 7) # CCSDS 7-bit scrambler
descrambler = digital.descrambler_bb(0x8a, 0x7F, 7)
dst = blocks.vector_sink_b()
self.tb.connect(src, scrambler, descrambler, dst)
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 = blocks.vector_source_b(src_data, False)
scrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7)
descrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7)
dst = blocks.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 = blocks.vector_source_b(src_data, False)
scrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100)
descrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100)
dst = blocks.vector_sink_b()
self.tb.connect(src, scrambler, descrambler, dst)
self.tb.run()
self.assertEqual(src_data, dst.data())
def test_additive_scrambler_reset_3bpb(self):
src_data = (5,)*2000
src = blocks.vector_source_b(src_data, False)
scrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100, 3)
descrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100, 3)
dst = blocks.vector_sink_b()
dst2 = blocks.vector_sink_b()
self.tb.connect(src, scrambler, descrambler, dst)
self.tb.connect(scrambler, dst2)
self.tb.run()
if not (src_data == dst.data()):
self.fail('Not equal.')
self.assertEqual(src_data, src_data)
def test_additive_scrambler_tags(self):
src_data = (1,)*1000
src = blocks.vector_source_b(src_data, False)
scrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100)
descrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100)
reset_tag_key = 'reset_lfsr'
reset_tag1 = gr.tag_t()
reset_tag1.key = pmt.string_to_symbol(reset_tag_key)
reset_tag1.offset = 17
reset_tag2 = gr.tag_t()
reset_tag2.key = pmt.string_to_symbol(reset_tag_key)
reset_tag2.offset = 110
reset_tag3 = gr.tag_t()
reset_tag3.key = pmt.string_to_symbol(reset_tag_key)
reset_tag3.offset = 523
src = blocks.vector_source_b(src_data, False, 1, (reset_tag1, reset_tag2, reset_tag3))
scrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100, 1, reset_tag_key)
descrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 100, 1, reset_tag_key)
dst = blocks.vector_sink_b()
self.tb.connect(src, scrambler, descrambler, dst)
self.tb.run()
self.assertEqual(src_data, dst.data())
def test_additive_scrambler_tags_oneway(self):
src_data = range(0, 10)
reset_tag_key = 'reset_lfsr'
reset_tag1 = gr.tag_t()
reset_tag1.key = pmt.string_to_symbol(reset_tag_key)
reset_tag1.offset = 0
reset_tag2 = gr.tag_t()
reset_tag2.key = pmt.string_to_symbol(reset_tag_key)
reset_tag2.offset = 10
reset_tag3 = gr.tag_t()
reset_tag3.key = pmt.string_to_symbol(reset_tag_key)
reset_tag3.offset = 20
src = blocks.vector_source_b([s * 3 for s in src_data], False, 1, (reset_tag1, reset_tag2, reset_tag3))
scrambler = digital.additive_scrambler_bb(0x8a, 0x7f, 7, 0, 8, reset_tag_key)
dst = blocks.vector_sink_b()
self.tb.connect(src, scrambler, dst)
self.tb.run()
expected_data = additive_scramble_lfsr(0x8a, 0x7f, 7, 8, src_data)
self.assertEqual(expected_data * 3, dst.data())
if __name__ == '__main__':
gr_unittest.run(test_scrambler, "test_scrambler.xml")
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