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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# -*- coding: utf-8 -*-
#
# Moving average
#
# Copyright 2018-2020 Michael Buesch <m@bues.ch>
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
__all__ = [
"MovingAvg",
]
import micropython
class MovingAvg(object):
__slots__ = (
"__size",
"__items",
"__nrItems",
"__beginPtr",
"__endPtr",
"__avgSum",
)
def __init__(self, size):
assert size > 0
self.__size = size
self.__items = [0.0] * self.__size
self.__nrItems = 0
self.__beginPtr = 0
self.__endPtr = 0
self.__avgSum = 0
@micropython.native
def calculate(self, value):
size = self.__size
nrItems = self.__nrItems
if nrItems >= size:
# Get and remove the first element from the list.
beginPtr = self.__beginPtr
first = self.__items[beginPtr]
beginPtr += 1
if beginPtr >= size:
beginPtr = 0
self.__beginPtr = beginPtr
# Append the new value to the list.
endPtr = self.__endPtr
self.__items[endPtr] = value
endPtr += 1
if endPtr >= size:
endPtr = 0
self.__endPtr = endPtr
avgSum = self.__avgSum
if nrItems >= size:
# Subtract the removed value from the sum
# and add the new value.
avgSum -= first
avgSum += value
else:
# The list is not fully populated, yet.
avgSum += value
self.__nrItems = nrItems = nrItems + 1
self.__avgSum = avgSum
return avgSum / nrItems
__call__ = calculate
# vim: ts=4 sw=4 expandtab
|
