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-rwxr-xr-xgr-digital/python/qa_glfsr_source.py95
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diff --git a/gr-digital/python/qa_glfsr_source.py b/gr-digital/python/qa_glfsr_source.py
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--- a/gr-digital/python/qa_glfsr_source.py
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-#!/usr/bin/env python
-#
-# Copyright 2007,2010,2012 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
-import digital_swig as digital
-
-class test_glfsr_source(gr_unittest.TestCase):
-
- def setUp (self):
- self.tb = gr.top_block ()
-
- def tearDown (self):
- self.tb = None
-
- def test_000_make_b(self):
- src = digital.glfsr_source_b(16)
- self.assertEquals(src.mask(), 0x8016)
- self.assertEquals(src.period(), 2**16-1)
-
- def test_001_degree_b(self):
- self.assertRaises(RuntimeError,
- lambda: gr.glfsr_source_b(0))
- self.assertRaises(RuntimeError,
- lambda: gr.glfsr_source_b(33))
-
- def test_002_correlation_b(self):
- for degree in range(1,11): # Higher degrees take too long to correlate
- src = digital.glfsr_source_b(degree, False)
- b2f = digital.chunks_to_symbols_bf((-1.0,1.0), 1)
- dst = gr.vector_sink_f()
- del self.tb # Discard existing top block
- self.tb = gr.top_block()
- self.tb.connect(src, b2f, dst)
- self.tb.run()
- self.tb.disconnect_all()
- actual_result = dst.data()
- R = auto_correlate(actual_result)
- self.assertEqual(R[0], float(len(R))) # Auto-correlation peak at origin
- for i in range(len(R)-1):
- self.assertEqual(R[i+1], -1.0) # Auto-correlation minimum everywhere else
-
- def test_003_make_f(self):
- src = digital.glfsr_source_f(16)
- self.assertEquals(src.mask(), 0x8016)
- self.assertEquals(src.period(), 2**16-1)
-
- def test_004_degree_f(self):
- self.assertRaises(RuntimeError,
- lambda: gr.glfsr_source_f(0))
- self.assertRaises(RuntimeError,
- lambda: gr.glfsr_source_f(33))
- def test_005_correlation_f(self):
- for degree in range(1,11): # Higher degrees take too long to correlate
- src = digital.glfsr_source_f(degree, False)
- dst = gr.vector_sink_f()
- del self.tb # Discard existing top block
- self.tb = gr.top_block()
- self.tb.connect(src, dst)
- self.tb.run()
-
- actual_result = dst.data()
- R = auto_correlate(actual_result)
- self.assertEqual(R[0], float(len(R))) # Auto-correlation peak at origin
- for i in range(len(R)-1):
- self.assertEqual(R[i+1], -1.0) # Auto-correlation minimum everywhere else
-
-def auto_correlate(data):
- l = len(data)
- R = [0,]*l
- for lag in range(l):
- for i in range(l):
- R[lag] += data[i]*data[i-lag]
- return R
-
-if __name__ == '__main__':
- gr_unittest.run(test_glfsr_source, "test_glfsr_source.xml")