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# -*- coding: utf-8 -*-
#
# AWL data types helper functions
#
# Copyright 2013-2018 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 *
from awlsim.common.util import *
from awlsim.common.exceptions import *
import struct #@nocy
__all__ = [
"swapEndianWord",
"swapEndianDWord",
"byteToSignedPyInt",
"wordToSignedPyInt",
"dwordToSignedPyInt",
"qwordToSignedPyInt",
"pyFloatToDWord",
"dwordToPyFloat",
"floatConst",
"isNaN",
"isInf",
"isPosNegZero",
"isDenormalPyFloat",
"pyFloatEqual",
"floatEqual",
"roundUp",
"intDivRoundUp",
"getMSB",
"isInteger",
"isString",
]
__floatStruct = struct.Struct(str('>f')) #@nocy
__wordStruct = struct.Struct(str('>H')) #@nocy
__leWordStruct = struct.Struct(str('<H')) #@nocy
__dwordStruct = struct.Struct(str('>I')) #@nocy
__leDWordStruct = struct.Struct(str('<I')) #@nocy
# Swap the endianness of an S7 word.
# The Cython variant of this function is defined in .pxd.in
def swapEndianWord(word, #@nocy
__be=__wordStruct, #@nocy
__le=__leWordStruct): #@nocy
return __le.unpack(__be.pack(word))[0] #@nocy
# Swap the endianness of an S7 dword.
# The Cython variant of this function is defined in .pxd.in
def swapEndianDWord(dword, #@nocy
__be=__dwordStruct, #@nocy
__le=__leDWordStruct): #@nocy
return __le.unpack(__be.pack(dword))[0] #@nocy
# Convert a S7 byte to a signed Python int.
# This applies the two's complement, if the byte is negative
# so that the resulting Python int will have the correct sign.
# The Cython variant of this function is defined in .pxd.in
def byteToSignedPyInt(byte): #@nocy
if byte & 0x80: #@nocy
return -((~byte + 1) & 0xFF) #@nocy
return byte & 0xFF #@nocy
# Convert a S7 word to a signed Python int.
# This applies the two's complement, if the word is negative
# so that the resulting Python int will have the correct sign.
# The Cython variant of this function is defined in .pxd.in
def wordToSignedPyInt(word): #@nocy
if word & 0x8000: #@nocy
return -((~word + 1) & 0xFFFF) #@nocy
return word & 0xFFFF #@nocy
# 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.
# The Cython variant of this function is defined in .pxd.in
def dwordToSignedPyInt(dword): #@nocy
if dword & 0x80000000: #@nocy
return -((~dword + 1) & 0xFFFFFFFF) #@nocy
return dword & 0xFFFFFFFF #@nocy
# Convert a quad-word (64 bit) to a signed Python int.
# This applies the two's complement, if the qword is negative
# so that the resulting Python int will have the correct sign.
# The Cython variant of this function is defined in .pxd.in
def qwordToSignedPyInt(qword): #@nocy
if qword & 0x8000000000000000: #@nocy
return -((~qword + 1) & 0xFFFFFFFFFFFFFFFF) #@nocy
return qword & 0xFFFFFFFFFFFFFFFF #@nocy
# Convert a Python float to an S7 dword.
def pyFloatToDWord(pyfl, #@nocy
__f=__floatStruct, #@nocy
__d=__dwordStruct): #@nocy
#cdef uint32_t pyFloatToDWord(double pyfl): #@cy
# cdef _floatCastUnion u #@cy
# cdef uint32_t dword #@cy
try: #@nocy
dword = __d.unpack(__f.pack(pyfl))[0] #@nocy
except OverflowError: #@nocy
if pyfl < 0.0: #@nocy
dword = floatConst.minNormNegFloat32DWord #@nocy
else: #@nocy
dword = floatConst.maxNormPosFloat32DWord #@nocy
# u.fvalue = <float>pyfl; #@cy
# dword = u.value32 #@cy
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.
# The Cython variant of this function is defined in .pxd.in
def dwordToPyFloat(dword, #@nocy
__f=__floatStruct, #@nocy
__d=__dwordStruct): #@nocy
return __f.unpack(__d.pack(dword))[0] #@nocy
class FloatConst(object): #+cdef
__slots__ = (
"minNormPosFloat32DWord",
"minNormPosFloat32",
"minNormNegFloat32DWord",
"minNormNegFloat32",
"maxNormNegFloat32DWord",
"maxNormNegFloat32",
"maxNormPosFloat32DWord",
"maxNormPosFloat32",
"posInfDWord",
"posInfFloat",
"negInfDWord",
"negInfFloat",
"pNaNDWord",
"nNaNDWord",
"nNaNFloat",
"negZeroDWord",
"epsilonFloat",
)
def __init__(self):
# The smallest normalized positive 32-bit float.
self.minNormPosFloat32DWord = 0x00000001
self.minNormPosFloat32 = dwordToPyFloat(self.minNormPosFloat32DWord)
# The smallest normalized negative 32-bit float.
self.minNormNegFloat32DWord = 0xFF7FFFFF
self.minNormNegFloat32 = dwordToPyFloat(self.minNormNegFloat32DWord)
# The biggest normalized negative 32-bit float.
self.maxNormNegFloat32DWord = 0x80000001
self.maxNormNegFloat32 = dwordToPyFloat(self.maxNormNegFloat32DWord)
# The biggest normalized positive 32-bit float.
self.maxNormPosFloat32DWord = 0x7F7FFFFF
self.maxNormPosFloat32 = dwordToPyFloat(self.maxNormPosFloat32DWord)
# Positive infinity
self.posInfDWord = 0x7F800000
self.posInfFloat = dwordToPyFloat(self.posInfDWord)
# Negative infinity
self.negInfDWord = 0xFF800000
self.negInfFloat = dwordToPyFloat(self.negInfDWord)
# Positive NaN
self.pNaNDWord = 0x7FFFFFFF
# Negative NaN
self.nNaNDWord = 0xFFFFFFFF
self.nNaNFloat = dwordToPyFloat(self.nNaNDWord)
# Negative zero
self.negZeroDWord = 0x80000000
# Compare threshold
self.epsilonFloat = 0.0000001
floatConst = FloatConst() #+cdef-FloatConst
# Check if dword is positive or negative NaN
# The Cython variant of this function is defined in .pxd.in
def isNaN(dword): #@nocy
return (dword & 0x7FFFFFFF) > 0x7F800000 #@nocy
# Check if dword is positive or negative infinity.
# The Cython variant of this function is defined in .pxd.in
def isInf(dword): #@nocy
return (dword & 0x7FFFFFFF) == 0x7F800000 #@nocy
# Check if dword is positive or negative zero in IEEE float encoding.
# The Cython variant of this function is defined in .pxd.in
def isPosNegZero(dword): #@nocy
return (dword & 0x7FFFFFFF) == 0 #@nocy
# Check if a Python float is in the denormalized range.
# The Cython variant of this function is defined in .pxd.in
def isDenormalPyFloat(pyfl, #@nocy
__min=floatConst.minNormPosFloat32, #@nocy
__max=floatConst.maxNormNegFloat32): #@nocy
return ((pyfl > 0.0 and pyfl < __min) or #@nocy
(pyfl < 0.0 and pyfl > __max)) #@nocy
# Check if two Python floats are equal.
def pyFloatEqual(pyfl0, pyfl1): #@nocy
return abs(pyfl0 - pyfl1) < floatConst.epsilonFloat #@nocy
# Check if two Python floats or S7 dword are equal.
def floatEqual(fl0, fl1): #@nocy
#cdef _Bool floatEqual(object fl0, object fl1): #@cy
if not isinstance(fl0, float):
fl0 = dwordToPyFloat(fl0)
if not isinstance(fl1, float):
fl1 = dwordToPyFloat(fl1)
return pyFloatEqual(fl0, fl1)
# Round up integer 'n' to a multiple of integer 's'
# The Cython variant of this function is defined in .pxd.in
def roundUp(n, s): #@nocy
return ((n + s - 1) // s) * s #@nocy
# Divide integer 'n' by 'd' and round up to the next integer
# The Cython variant of this function is defined in .pxd.in
def intDivRoundUp(n, d): #@nocy
return (n + d - 1) // d #@nocy
# Get the most significant bit set in a 32 bit integer
# and return an integer with only that bit set.
# If the value is bigger than 0xFFFFFFFF the behavior is undefined.
def getMSB(value): #@nocy
#cdef uint32_t getMSB(uint32_t value): #@cy
value |= value >> 1
value |= value >> 2
value |= value >> 4
value |= value >> 8
value |= value >> 16
return value ^ (value >> 1)
def __isInteger_python2(value): #@nocy #@nocov
return isinstance(value, (int, long)) #@nocy
def __isInteger_python3(value): #@nocy #@nocov
return isinstance(value, int) #@nocy
isInteger = py23(__isInteger_python2, #@nocy
__isInteger_python3) #@nocy
def __isString_python2(value): #@nocy #@nocov
return isinstance(value, (unicode, str)) #@nocy
def __isString_python3(value): #@nocy #@nocov
return isinstance(value, str) #@nocy
isString = py23(__isString_python2, #@nocy
__isString_python3) #@nocy
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