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# -*- coding: utf-8 -*-
#
# AWL simulator - counters
#
# 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.util import *
class Counter(object):
"""Classic AWL counter."""
__slots__ = (
"cpu",
"index",
"prevVKE_FR",
"prevVKE_S",
"prevVKE_ZV",
"prevVKE_ZR",
"counter",
)
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
# Get the counter state (Q)
def get(self):
return 1 if self.counter else 0
# Get the binary counter value (DUAL)
def getValueBin(self):
return self.counter
# Get the BCD counter value (DEZ)
def getValueBCD(self):
bcd = self.counter % 10
bcd |= ((self.counter // 10) % 10) << 4
bcd |= ((self.counter // 100) % 10) << 8
return bcd
# Set the counter to a BCD value
def setValueBCD(self, bcd):
a, b, c = (bcd & 0xF),\
((bcd >> 4) & 0xF),\
((bcd >> 8) & 0xF)
if bcd > 0x999 or a > 9 or b > 9 or c > 9:
raise AwlSimError("Invalid BCD value")
self.counter = a + (b * 10) + (c * 100)
# Set (S) the counter to a value (accu1)
def set(self, VKE):
if ~self.prevVKE_S & VKE:
self.setValueBCD(self.cpu.accu1.get())
self.prevVKE_S = VKE
# Reset (R) the counter
def reset(self):
self.counter = 0
# Run the FR instruction
def run_FR(self, VKE):
if ~self.prevVKE_FR & VKE:
self.prevVKE_S = 0
self.prevVKE_ZV = 0
self.prevVKE_ZR = 0
self.prevVKE_FR = VKE
# Run the ZV instruction
def run_ZV(self, VKE):
if ~self.prevVKE_ZV & VKE:
if self.counter < 999:
self.counter += 1
self.prevVKE_ZV = VKE
# Run the ZR instruction
def run_ZR(self, VKE):
if ~self.prevVKE_ZR & VKE:
if self.counter > 0:
self.counter -= 1
self.prevVKE_ZR = VKE
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