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# -*- coding: utf-8 -*-
#
# AWL simulator - counters
# Copyright 2012-2013 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2.
#
from util import *
class Counter(object):
def __init__(self, cpu, index):
self.cpu = cpu
self.index = index
self.prevVKE_FR = 0
self.prevVKE_S = 0
self.prevVKE_ZV = 0
self.prevVKE_ZR = 0
self.counter = 0
def get(self):
return 1 if self.counter else 0
def getValueBin(self):
return self.counter
def getValueBCD(self):
bcd = self.counter % 10
bcd |= ((self.counter // 10) % 10) << 4
bcd |= ((self.counter // 100) % 10) << 8
return bcd
def set(self, VKE):
if (~self.prevVKE_S & VKE) & 1:
counterBCD = self.cpu.accu1.get()
a, b, c = (counterBCD & 0xF),\
((counterBCD >> 4) & 0xF),\
((counterBCD >> 8) & 0xF)
if counterBCD > 0x999 or a > 9 or b > 9 or c > 9:
raise AwlSimError("Invalid BCD value")
self.counter = a + (b * 10) + (c * 100)
self.prevVKE_S = VKE
def reset(self):
self.counter = 0
def run_FR(self, VKE):
if (~self.prevVKE_FR & VKE) & 1:
self.prevVKE_S = 0
self.prevVKE_ZV = 0
self.prevVKE_ZR = 0
self.prevVKE_FR = VKE
def run_ZV(self, VKE):
if (~self.prevVKE_ZV & VKE) & 1:
if self.counter < 999:
self.counter += 1
self.prevVKE_ZV = VKE
def run_ZR(self, VKE):
if (~self.prevVKE_ZR & VKE) & 1:
if self.counter > 0:
self.counter -= 1
self.prevVKE_ZR = VKE
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