1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#!/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 ax25_deframer(gr.hier_block2):
"""
Hierarchical block to deframe AX.25.
The input is a float stream of soft symbols. The output are PDUs
with AX.25 frames.
The input should be NRZ-I encoded and optionally G3RUH scrambled.
Args:
g3ruh_scrambler: use G3RUH descrambling (boolean)
options: Options from argparse
"""
def __init__(self, g3ruh_scrambler, options=None):
gr.hier_block2.__init__(
self,
'ax25_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.nrzi = nrzi_decode()
if g3ruh_scrambler:
self.descrambler = digital.descrambler_bb(0x21, 0, 16)
self.deframer = hdlc_deframer(True, 10000)
self._blocks = [self, self.slicer, self.nrzi]
if g3ruh_scrambler:
self._blocks.append(self.descrambler)
self._blocks += [self.deframer]
self.connect(*self._blocks)
self.msg_connect((self.deframer, 'out'), (self, 'out'))
|
