blob: 2b8a47cb76414759f903584bb2b6a002c6053caa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
#!/usr/bin/env python
#
# Copyright 2020 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
def lfsr_args(seed, *exp):
"""
Produce arguments to create scrambler objects from exponent polynomial expressions.
seed: start-value of register
*exp: exponents of desired polynomial.
Example:
>>> l = digital.lfsr(*lfrs_args(0b11001,7,1,0))
Creates an lfsr object with seed 0b11001, mask 0b1000011, K=6
"""
from functools import reduce
return reduce(int.__xor__, map(lambda x:2**x, exp)), seed, max(exp)-1
|
