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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2019 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
from gnuradio import gr, digital
from ... import nrzi_decode, hdlc_deframer
class ua01_deframer(gr.hier_block2):
"""
Hierarchical block to deframe UA01 non-conformant AX.25.
The input is a float stream of soft symbols. The output are PDUs
with UA01 frames.
The input should be doubly NRZ-I encoded and G3RUH scrambled.
Args:
options: Options from argparse
"""
def __init__(self, options=None):
gr.hier_block2.__init__(
self,
'ua01_deframer',
gr.io_signature(1, 1, gr.sizeof_float),
gr.io_signature(0, 0, 0))
self.message_port_register_hier_out('out')
self.slicer = digital.binary_slicer_fb()
self.nrzi0 = nrzi_decode()
self.nrzi1 = nrzi_decode()
self.descrambler = digital.descrambler_bb(0x21, 0, 16)
self.deframer = hdlc_deframer(True, 10000)
self.connect(self, self.slicer, self.nrzi0, self.nrzi1,
self.descrambler, self.deframer)
self.msg_connect((self.deframer, 'out'), (self, 'out'))
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