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# -*- coding: utf-8 -*-
#
# AWL simulator - status word
# Copyright 2012 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2.
#
from util import *
class S7StatusWord(object):
"STEP 7 status word"
name2nr = {
"/ER" : 0,
"VKE" : 1,
"STA" : 2,
"OR" : 3,
"OS" : 4,
"OV" : 5,
"A0" : 6,
"A1" : 7,
"BIE" : 8,
}
nr2name = { }
for name, type in name2nr.items():
nr2name[type] = name
NR_BITS = 9
@classmethod
def getBitnrByName(cls, name):
try:
return cls.name2nr[name]
except KeyError as e:
raise AwlSimError("Invalid status word bit "
"name: " + str(name))
def __init__(self):
self.reset()
def getByBitNumber(self, bitNumber):
try:
return (self.NER, self.VKE, self.STA, self.OR,
self.OS, self.OV, self.A0, self.A1,
self.BIE)[bitNumber]
except IndexError as e:
raise AwlSimError("Status word bit fetch '%d' "
"out of range" % bitNumber)
def getWord(self):
pass#TODO
def reset(self):
self.NER = 0 # /ER => Erstabfrage
self.VKE = 0 # VKE => Verknuepfungsergebnis
self.STA = 0 # STA => Statusbit
self.OR = 0 # OR => Oderbit
self.OS = 0 # OS => Ueberlauf speichernd
self.OV = 0 # OV => Ueberlauf
self.A0 = 0 # A0 => Ergebnisanzeige 0
self.A1 = 0 # A1 => Ergebnisanzeige 1
self.BIE = 0 # BIE => Binaerergebnis
def setForFloatingPoint(self, dword):
noSign, s = dword & 0x7FFFFFFF, self
if noSign == 0: # zero
s.A1, s.A0, s.OV = 0, 0, 0
elif noSign < 0x00800000: # denorm
s.A1, s.A0, s.OV, s.OS = 0, 0, 1, 1
elif noSign >= 0x7F800000:
if noSign == 0x7F800000: # inf
if dword & 0x80000000:
s.A1, s.A0, s.OV, s.OS = 0, 1, 1, 1
else:
s.A1, s.A0, s.OV, s.OS = 1, 0, 1, 1
else: # nan
s.A1, s.A0, s.OV, s.OS = 1, 1, 1, 1
elif dword & 0x80000000:
s.A1, s.A0, s.OV = 0, 1, 0
else:
s.A1, s.A0, s.OV = 1, 0, 0
def __repr__(self):
ret = []
for i in range(self.NR_BITS - 1, -1, -1):
ret.append("%s=%d" % (
self.nr2name[i],
self.getByBitNumber(i)
))
return ', '.join(ret)
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