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# -*- coding: utf-8 -*-
#
# AWL data types helper functions
#
# Copyright 2013-2016 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.compat import *
from awlsim.common.util import *
import struct
__floatStruct = struct.Struct(str('>f'))
__wordStruct = struct.Struct(str('>H'))
__leWordStruct = struct.Struct(str('<H'))
__dwordStruct = struct.Struct(str('>I'))
__leDWordStruct = struct.Struct(str('<I'))
# Swap the endianness of an S7 word.
def swapEndianWord(word,
__be=__wordStruct,
__le=__leWordStruct):
return __le.unpack(__be.pack(word))[0]
assert(swapEndianWord(0x1234) == 0x3412)
assert(swapEndianWord(swapEndianWord(0x1234)) == 0x1234)
# Swap the endianness of an S7 dword.
def swapEndianDWord(dword,
__be=__dwordStruct,
__le=__leDWordStruct):
return __le.unpack(__be.pack(dword))[0]
assert(swapEndianDWord(0x12345678) == 0x78563412)
assert(swapEndianDWord(swapEndianDWord(0x12345678)) == 0x12345678)
# Convert a S7 byte to a signed Python int.
# This applies the two's complement, if the dword is negative
# so that the resulting Python int will have the correct sign.
def byteToSignedPyInt(byte):
if byte & 0x80:
return -((~byte + 1) & 0xFF)
return byte & 0xFF
# Convert a S7 word to a signed Python int.
# This applies the two's complement, if the dword is negative
# so that the resulting Python int will have the correct sign.
def wordToSignedPyInt(word):
if word & 0x8000:
return -((~word + 1) & 0xFFFF)
return word & 0xFFFF
# Convert a S7 dword to a signed Python int.
# This applies the two's complement, if the dword is negative
# so that the resulting Python int will have the correct sign.
def dwordToSignedPyInt(dword):
if dword & 0x80000000:
return -((~dword + 1) & 0xFFFFFFFF)
return dword & 0xFFFFFFFF
# Convert a Python float to an S7 dword.
def pyFloatToDWord(pyfl,
__f=__floatStruct,
__d=__dwordStruct):
dword = __d.unpack(__f.pack(pyfl))[0]
if isDenormalPyFloat(pyfl):
# Denormal floats are equal to zero on the S7 CPU.
# OV and OS flags are set in the StatusWord handler.
dword = 0x00000000
elif (dword & 0x7FFFFFFF) > 0x7F800000:
# NaNs are always all-ones on the S7 CPU.
dword = 0xFFFFFFFF
return dword
# Convert an S7 dword to a Python float.
def dwordToPyFloat(dword,
__f=__floatStruct,
__d=__dwordStruct):
return __f.unpack(__d.pack(dword))[0]
# The smallest normalized positive 32-bit float.
minNormPosFloat32DWord = 0x00000001
minNormPosFloat32 = dwordToPyFloat(minNormPosFloat32DWord)
# The smallest normalized negative 32-bit float.
minNormNegFloat32DWord = 0xFF7FFFFF
minNormNegFloat32 = dwordToPyFloat(minNormNegFloat32DWord)
# The biggest normalized negative 32-bit float.
maxNormNegFloat32DWord = 0x80000001
maxNormNegFloat32 = dwordToPyFloat(maxNormNegFloat32DWord)
# The biggest normalized positive 32-bit float.
maxNormPosFloat32DWord = 0x7F7FFFFF
maxNormPosFloat32 = dwordToPyFloat(maxNormPosFloat32DWord)
# Positive infinity
posInfDWord = 0x7F800000
posInfFloat = dwordToPyFloat(posInfDWord)
# Negative infinity
negInfDWord = 0xFF800000
negInfFloat = dwordToPyFloat(negInfDWord)
# Positive NaN
pNaNDWord = 0x7FFFFFFF
# Negative NaN
nNaNDWord = 0xFFFFFFFF
nNaNFloat = dwordToPyFloat(nNaNDWord)
# Check if dword is positive or negative NaN
def isNaN(dword):
return (dword & 0x7FFFFFFF) > 0x7F800000
# Check if a Python float is in the denormalized range.
def isDenormalPyFloat(pyfl,
__min=minNormPosFloat32,
__max=maxNormNegFloat32):
return (pyfl > 0.0 and pyfl < __min) or\
(pyfl < 0.0 and pyfl > __max)
# Check if two Python floats are equal.
def pyFloatEqual(pyfl0, pyfl1):
return abs(pyfl0 - pyfl1) < 0.000001
# Check if two Python floats or S7 dword are equal.
def floatEqual(fl0, fl1):
if not isinstance(fl0, float):
fl0 = dwordToPyFloat(fl0)
if not isinstance(fl1, float):
fl1 = dwordToPyFloat(fl1)
return pyFloatEqual(fl0, fl1)
# Constant value sanity checks.
assert(pyFloatToDWord(minNormPosFloat32) == minNormPosFloat32DWord)
assert(pyFloatToDWord(minNormNegFloat32) == minNormNegFloat32DWord)
assert(pyFloatToDWord(maxNormNegFloat32) == maxNormNegFloat32DWord)
assert(pyFloatToDWord(maxNormPosFloat32) == maxNormPosFloat32DWord)
assert(pyFloatToDWord(posInfFloat) == posInfDWord)
assert(pyFloatToDWord(negInfFloat) == negInfDWord)
assert(pyFloatToDWord(nNaNFloat) == nNaNDWord)
# Round up integer 'n' to a multiple of integer 's'
def roundUp(n, s):
return ((n + s - 1) // s) * s
# Divide integer 'n' by 'd' and round up to the next integer
def intDivRoundUp(n, d):
return (n + d - 1) // d
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