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# -*- coding: utf-8 -*-
#
# AWL simulator - Raspberry Pi GPIO hardware interface
#
# Copyright 2016 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
import re
class HwParamDesc_IOMap(HwParamDesc):
typeStr = "BCM-port-number"
_valueRe = re.compile(r'^\s*(?:BCM)?(\d+)\s*$')
def __init__(self, mem):
HwParamDesc.__init__(self,
name = "%s0.0" % mem,
description = "Example: %s1.4=BCM26" % mem)
def parse(self, value):
try:
if not value:
raise ValueError
m = self._valueRe.match(value.upper())
if not m:
raise ValueError
bcm = int(m.group(1), 10)
if bcm < 0:
raise ValueError
return bcm
except ValueError:
raise self.ParseError("Invalid BCM port number: %s" % value)
def match(self, matchName):
if not matchName:
return False
return bool(self._nameRe.match(matchName))
class HwParamDesc_IMap(HwParamDesc_IOMap):
_nameRe = re.compile(r'^\s*[EI]([0-9]+)\.([0-7])\s*$')
def __init__(self):
HwParamDesc_IOMap.__init__(self, mem = "I")
class HwParamDesc_QMap(HwParamDesc_IOMap):
_nameRe = re.compile(r'^\s*[AQ]([0-9])+\.([0-7])\s*$')
def __init__(self):
HwParamDesc_IOMap.__init__(self, mem = "Q")
class RpiGPIO_BitMapping(object):
"""Awlsim -> RaspiGPIO memory bit mapping.
"""
def __init__(self):
# Bit number to BCM GPIO number map.
self.bit2bcm = [ None, ] * 8
self.mapList = []
def setBit(self, bitOffset, bcmNumber):
assert(bitOffset >= 0 and bitOffset <= 7)
self.bit2bcm[bitOffset] = bcmNumber
def build(self):
self.mapList = [ (bitOffset, self.bit2bcm[bitOffset])
for bitOffset in range(8)
if self.bit2bcm[bitOffset] is not None ]
def __repr__(self):
return "{ " +\
", ".join("%d: %s" % (i, str(self.bit2bcm[i]))
for i in range(8)) +\
" }"
class RpiGPIO_HwInterface(AbstractHardwareInterface):
"""Raspberry Pi GPIO hardware interface.
"""
name = "RPi.GPIO"
paramDescs = [
HwParamDesc_IMap(),
HwParamDesc_QMap(),
]
def __init__(self, sim, parameters={}):
AbstractHardwareInterface.__init__(self,
sim = sim,
parameters = parameters)
def doStartup(self):
"""Startup the hardware module.
"""
# Get the configuration
inputs = self.getParamsByDescType(HwParamDesc_IMap)
outputs = self.getParamsByDescType(HwParamDesc_QMap)
# Import the Raspberry Pi GPIO module
try:
import RPi.GPIO as RPi_GPIO
self.__RPi_GPIO = RPi_GPIO
except ImportError as e:
self.raiseException("Failed to import Raspberry Pi GPIO "
"module 'RPi.GPIO': %s" % str(e))
# Initialize the GPIO library
try:
RPi_GPIO.setmode(self.__RPi_GPIO.BCM)
RPi_GPIO.setwarnings(False)
except RuntimeError as e:
self.raiseException("Failed to init Raspberry Pi "
"GPIO library: %s" % str(e))
# Build the memory mappings
self.__inputMap, self.__inputList = self.__mapGPIO(
inputs, HwParamDesc_IMap._nameRe, RPi_GPIO.IN,
self.inputAddressBase)
self.__outputMap, self.__outputList = self.__mapGPIO(
outputs, HwParamDesc_QMap._nameRe, RPi_GPIO.OUT,
self.outputAddressBase)
def __mapGPIO(self, configs, nameRegEx, gpioDir, byteBaseOffset):
mapDict = {}
RPi_GPIO = self.__RPi_GPIO
for address, bcmNumber in configs:
m = nameRegEx.match(address)
byteOffset = int(m.group(1), 10)
bitOffset = int(m.group(2), 10)
mapping = mapDict.setdefault(byteBaseOffset + byteOffset,
RpiGPIO_BitMapping())
mapping.setBit(bitOffset, bcmNumber)
try:
if gpioDir == RPi_GPIO.IN:
RPi_GPIO.setup(bcmNumber,
gpioDir,
pull_up_down = RPi_GPIO.PUD_DOWN)
else:
RPi_GPIO.setup(bcmNumber,
gpioDir,
initial = RPi_GPIO.LOW)
except RuntimeError as e:
self.raiseException("Failed to init Raspberry Pi "
"BCM%d: %s" % (bcmNumber, str(e)))
for bitMapping in dictValues(mapDict):
bitMapping.build()
mapList = list(sorted(
[ (byteOffset, bitMapping)
for byteOffset, bitMapping in dictItems(mapDict) ],
key = lambda _tuple: _tuple[0]
))
return mapDict, mapList
def doShutdown(self):
pass # Do nothing
def readInputs(self):
RPi_GPIO = self.__RPi_GPIO
for byteOffset, bitMapping in self.__inputList:
inByte = 0
for bitOffset, bcmNumber in bitMapping.mapList:
if RPi_GPIO.input(bcmNumber):
inByte |= 1 << bitOffset
self.sim.cpu.storeInputRange(byteOffset, (inByte, ))
def writeOutputs(self):
RPi_GPIO = self.__RPi_GPIO
for byteOffset, bitMapping in self.__outputList:
outByte = self.sim.cpu.fetchOutputRange(byteOffset, 1)[0]
for bitOffset, bcmNumber in bitMapping.mapList:
RPi_GPIO.output(bcmNumber,
outByte & (1 << bitOffset))
def directReadInput(self, accessWidth, accessOffset):
if accessOffset < self.inputAddressBase:
return None
RPi_GPIO = self.__RPi_GPIO
nrBytes = accessWidth // 8
pass#TODO
return None
def directWriteOutput(self, accessWidth, accessOffset, data):
if accessOffset < self.outputAddressBase:
return False
RPi_GPIO = self.__RPi_GPIO
nrBytes = accessWidth // 8
pass#TODO
return True
# The main entry point to the module.
HardwareInterface = RpiGPIO_HwInterface
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