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# -*- coding: utf-8 -*-
#
# AWL simulator - Low pass filter
#
# Copyright 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.
#
from __future__ import division, absolute_import, print_function, unicode_literals
#from awlsim.common.cython_support cimport * #@cy
from awlsim.common.compat import *
#cimport cython #@cy
from math import isfinite #@nocy
#from libc.math cimport isfinite #@cy
class LPFilter(object): #+cdef
"""Low pass filter.
"""
__slots__ = (
"__div",
"__state",
"__initial",
)
def __init__(self, div, state=0.0):
self.__div = float(div)
if self.__div <= 0.0:
self.__div = 1.0
self.__initial = float(state)
self.reset()
def reset(self): #@nocy
#@cy cdef void reset(self):
self.__state = self.__initial
def run(self, value): #@nocy
#@cy @cython.cdivision(True)
#@cy cdef double run(self, double value):
#@cy cdef double div
#@cy cdef double state
#@cy cdef double newState
div = self.__div
state = self.__state
newState = (state - (state / div)) + value
if not isfinite(newState):
newState = state
self.__state = newState
return newState / div
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