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# -*- coding: utf-8 -*-
#
# AWL simulator
#
# Copyright 2012-2013 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 awlsim.cpu import *
from awlsim.util import *
from awlsim.version import *
from awlsim.hardware import *
import importlib
class AwlSim(object):
def __init__(self):
self.__registeredHardware = []
self.cpu = S7CPU(self)
self.cpu.setPeripheralReadCallback(self.__peripheralReadCallback)
self.cpu.setPeripheralWriteCallback(self.__peripheralWriteCallback)
def __handleSimException(self, e):
if not e.getCpu():
# The CPU reference is not set, yet.
# Set it to the current CPU.
e.setCpu(self.cpu)
raise e
def shutdown(self):
for hw in self.__registeredHardware:
hw.shutdown()
def load(self, parseTree):
try:
self.cpu.load(parseTree)
for hw in self.__registeredHardware:
hw.startup()
self.cpu.startup()
except AwlSimError as e:
self.__handleSimException(e)
def getCPU(self):
return self.cpu
def runCycle(self):
try:
for hw in self.__registeredHardware:
hw.readInputs()
self.cpu.runCycle()
for hw in self.__registeredHardware:
hw.writeOutputs()
except AwlSimError as e:
self.__handleSimException(e)
def registerHardware(self, hwClassInst):
"""Register a new hardware interface."""
self.__registeredHardware.append(hwClassInst)
def registerHardwareClass(self, hwClass, parameters={}):
"""Register a new hardware interface class.
'parameters' is a dict of hardware specific parameters.
Returns the instance of the hardware class."""
hwClassInst = hwClass(sim = self,
parameters = parameters)
self.registerHardware(hwClassInst)
return hwClassInst
@classmethod
def loadHardwareModule(cls, name):
"""Load a hardware interface module.
'name' is the name of the module to load (without 'awlsimhw_' prefix).
Returns the HardwareInterface class."""
# Construct the python module name
moduleName = "awlsimhw_%s" % name
# Try to import the module
try:
mod = importlib.import_module(moduleName)
except ImportError as e:
raise AwlSimError("Failed to import hardware interface "
"module '%s' (import name '%s'): %s" %\
(name, moduleName, str(e)))
# Fetch and instantiate the interface object
hwClassName = "HardwareInterface"
hwClass = getattr(mod, hwClassName, None)
if not hwClass:
raise AwlSimError("Hardware module '%s' (import name '%s') "
"does not have a '%s' class." %\
(name, moduleName, hwClassName))
return hwClass
def __peripheralReadCallback(self, userData, width, offset):
# The CPU issued a direct peripheral read access.
# Poke all registered hardware modules, but only return the value
# from the last module returning a valid value.
retValue = None
for hw in self.__registeredHardware:
value = hw.directReadInput(width, offset)
if value is not None:
retValue = value
return retValue
def __peripheralWriteCallback(self, userData, width, offset, value):
# The CPU issued a direct peripheral write access.
# Send the write request down to all hardware modules.
# Returns true, if any hardware accepted the value.
retOk = False
for hw in self.__registeredHardware:
ok = hw.directWriteOutput(width, offset, value)
if not retOk:
retOk = ok
return retOk
def __repr__(self):
return str(self.cpu)
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