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#!/usr/bin/env python
#
# Copyright 2020-2021 Daniel Estevez <daniel@destevez.net>
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
from gnuradio import gr, gr_unittest, digital, blocks
import numpy as np
class test_nrzi(gr_unittest.TestCase):
def setUp(self):
test_size = 256
self.data = np.random.randint(0, 2, test_size, dtype='uint8')
self.source = blocks.vector_source_b(self.data, False, 1, [])
self.sink = blocks.vector_sink_b(1, 0)
self.tb = gr.top_block()
def tearDown(self):
self.tb = None
del(self.data)
del(self.source)
del(self.sink)
def test_encode(self):
"""Performs NRZI encode and checks the result"""
encoder = digital.diff_encoder_bb(2, digital.DIFF_NRZI)
self.tb.connect(self.source, encoder, self.sink)
self.tb.start()
self.tb.wait()
expected = np.cumsum((1 ^ self.data) & 1) & 1
np.testing.assert_equal(
self.sink.data(), expected,
'NRZI encode output does not match expected result')
def test_decode(self):
"""Performs NRZI decode and checks the result"""
decoder = digital.diff_decoder_bb(2, digital.DIFF_NRZI)
self.tb.connect(self.source, decoder, self.sink)
self.tb.start()
self.tb.wait()
expected = self.data[1:] ^ self.data[:-1] ^ 1
np.testing.assert_equal(
self.sink.data()[1:], expected,
'NRZI decode output does not match expected result')
def test_encode_decode(self):
"""Performs NRZI encode and decode and checks the result"""
encoder = digital.diff_encoder_bb(2, digital.DIFF_NRZI)
decoder = digital.diff_decoder_bb(2, digital.DIFF_NRZI)
self.tb.connect(self.source, encoder, decoder, self.sink)
self.tb.start()
self.tb.wait()
np.testing.assert_equal(
self.sink.data(), self.data,
'NRZI encoded and decoded output does not match input')
if __name__ == '__main__':
gr_unittest.run(test_nrzi)
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