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#
# Utility functions
# Copyright (c) 2020 Michael Büsch <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.
#
import micropython
from math import exp, log
__all__ = [
"lim",
"intp_lin",
"intp_log",
"pa2hpa",
"hpa2pa",
"pa2mbar",
"mbar2pa",
]
# Value clamping.
@micropython.native
def lim(val, minval, maxval):
return max(min(val, maxval), minval)
# Linear interpolation.
@micropython.native
def intp_lin(x, x0, y0, x1, y1):
dx = x1 - x0
if dx:
dy = y1 - y0
return y0 + (((x - x0) * dy) / dx)
return x0
# Logarithmic interpolation.
@micropython.native
def intp_log(x, x0, y0, x1, y1):
dx = x1 - x0
if dx:
return y0 * exp(((x - x0) * (log(y1) - log(y0))) / dx)
return x0
def pa2hpa(pascal):
"""Convert Pascal to Hectopascal.
"""
return pascal * 1e-2
def hpa2pa(hpa):
"""Convert Hectopascal to Pascal.
"""
return hpa * 1e2
pa2mbar = pa2hpa
mbar2pa = hpa2pa
# vim: ts=4 sw=4 expandtab
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