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# -*- coding: utf-8 -*-
#
# AWL simulator - instructions
#
# Copyright 2012-2014 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.core.instructions.main import * #@nocy
from awlsim.core.operators import *
#from awlsim.core.instructions.main cimport * #@cy
import math
class AwlInsn_LN(AwlInsn): #+cdef
def __init__(self, cpu, rawInsn):
AwlInsn.__init__(self, cpu, AwlInsn.TYPE_LN, rawInsn)
self.assertOpCount(0)
def run(self):
#@cy cdef S7StatusWord s
accu1 = self.cpu.accu1.getPyFloat()
try:
if accu1 == 0.0:
raise ValueError
accu1 = math.log(accu1)
except ValueError:
self.cpu.accu1.setDWord(pNaNDWord)
accu1 = nNaNFloat
else:
self.cpu.accu1.setPyFloat(accu1)
self.cpu.statusWord.setForFloatingPoint(accu1)
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