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# -*- coding: utf-8 -*-
#
# AWL simulator - Dummy hardware interface
#
# Copyright 2013-2014 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.hardware import *
from awlsim.core.operators import AwlOperator
from awlsim.core.datatypes import AwlOffset
class HardwareInterface(AbstractHardwareInterface):
name = "dummy"
def __init__(self, sim, parameters={}):
AbstractHardwareInterface.__init__(self,
sim = sim,
parameters = parameters)
def doStartup(self):
pass # Do nothing
def doShutdown(self):
pass # Do nothing
def readInputs(self):
pass # Do nothing
def writeOutputs(self):
pass # Do nothing
def directReadInput(self, accessWidth, accessOffset):
if accessOffset < self.inputAddressBase:
return None
# Just read the current value from the CPU and return it.
return self.sim.cpu.fetch(AwlOperator(AwlOperator.MEM_E,
accessWidth,
AwlOffset(accessOffset)))
def directWriteOutput(self, accessWidth, accessOffset, data):
if accessOffset < self.outputAddressBase:
return False
# Just pretend we wrote it somewhere.
return True
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