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# -*- coding: utf-8 -*-
#
# PROFIBUS DP - Configuration file parser
#
# Copyright (c) 2016 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2,
# or (at your option) any later version.
#
from __future__ import division, absolute_import, print_function, unicode_literals
from pyprofibus.compat import *
from pyprofibus.gsd.interp import GsdInterp
from pyprofibus.gsd.parser import GsdError
from pyprofibus.util import *
import re
from io import StringIO
if isPy2Compat:
from ConfigParser import SafeConfigParser as _ConfigParser
from ConfigParser import Error as _ConfigParserError
else:
from configparser import ConfigParser as _ConfigParser
from configparser import Error as _ConfigParserError
class PbConfError(ProfibusError):
pass
class PbConf(object):
"""Pyprofibus configuration file parser.
"""
class _SlaveConf(object):
"""Slave configuration.
"""
addr = None
gsd = None
syncMode = None
freezeMode = None
groupMask = None
watchdogMs = None
inputSize = None
outputSize = None
# [PROFIBUS] section
debug = None
# [PHY] section
phyType = None
phyDev = None
phyBaud = None
phyRtsCts = None
phyDsrDtr = None
# [DP] section
dpMasterClass = None
dpMasterAddr = None
# [SLAVE_xxx] sections
slaveConfs = None
@classmethod
def fromFile(cls, filename):
try:
with open(filename, "rb") as fd:
data = fd.read().decode("UTF-8")
except (IOError, UnicodeError) as e:
raise PbConfError("Failed to read '%s': %s" %\
(filename, str(e)))
return cls(data, filename)
__reSlave = re.compile(r'^SLAVE_(\d+)$')
__reMod = re.compile(r'^module_(\d+)$')
def __init__(self, text, filename = None):
def get(section, option, fallback = None):
if p.has_option(section, option):
return p.get(section, option)
if fallback is None:
raise ValueError("Option [%s] '%s' does not exist." % (
section, option))
return fallback
def getboolean(section, option, fallback = None):
if p.has_option(section, option):
return p.getboolean(section, option)
if fallback is None:
raise ValueError("Option [%s] '%s' does not exist." % (
section, option))
return fallback
def getint(section, option, fallback = None):
if p.has_option(section, option):
return p.getint(section, option)
if fallback is None:
raise ValueError("Option [%s] '%s' does not exist." % (
section, option))
return fallback
try:
p = _ConfigParser()
textIO = StringIO(text)
if hasattr(p, "read_file"):
p.read_file(textIO, filename)
else:
p.readfp(textIO, filename)
# [PROFIBUS]
self.debug = getint("PROFIBUS", "debug",
fallback = 0)
# [PHY]
self.phyType = get("PHY", "type",
fallback = "serial")
self.phyDev = get("PHY", "dev",
fallback = "/dev/ttyS0")
self.phyBaud = getint("PHY", "baud",
fallback = 9600)
self.phyRtsCts = getboolean("PHY", "rtscts",
fallback = False)
self.phyDsrDtr = getboolean("PHY", "dsrdtr",
fallback = False)
# [DP]
self.dpMasterClass = getint("DP", "master_class",
fallback = 1)
if self.dpMasterClass not in {1, 2}:
raise ValueError("Invalid master_class")
self.dpMasterAddr = getint("DP", "master_addr",
fallback = 0x02)
if self.dpMasterAddr < 0 or self.dpMasterAddr > 127:
raise ValueError("Invalid master_addr")
self.slaveConfs = []
for section in p.sections():
m = self.__reSlave.match(section)
if not m:
continue
s = self._SlaveConf()
s.addr = getint(section, "addr")
s.gsd = GsdInterp.fromFile(
get(section, "gsd"))
s.syncMode = getboolean(section, "sync_mode",
fallback = False)
s.freezeMode = getboolean(section, "freeze_mode",
fallback = False)
s.groupMask = getboolean(section, "group_mask",
fallback = 1)
if s.groupMask < 0 or s.groupMask > 0xFF:
raise ValueError("Invalid group_mask")
s.watchdogMs = getint(section, "watchdog_ms",
fallback = 5000)
if s.watchdogMs < 0 or s.watchdogMs > 255 * 255:
raise ValueError("Invalid watchdog_ms")
s.inputSize = getint(section, "input_size")
if s.inputSize < 0 or s.inputSize > 246:
raise ValueError("Invalid input_size")
s.outputSize = getint(section, "output_size")
if s.outputSize < 0 or s.outputSize > 246:
raise ValueError("Invalid output_size")
mods = [ o for o in p.options(section)
if self.__reMod.match(o) ]
mods.sort(key = lambda o: self.__reMod.match(o).group(1))
for option in mods:
s.gsd.setConfiguredModule(get(section, option))
self.slaveConfs.append(s)
except (_ConfigParserError, ValueError) as e:
raise PbConfError("Profibus config file parse "
"error:\n%s" % str(e))
except GsdError as e:
raise PbConfError("Failed to parse GSD file:\n%s" % str(e))
def makePhy(self):
"""Create a CP-PHY instance based on the configuration.
"""
phyType = self.phyType.lower().strip()
if phyType == "serial":
import pyprofibus.phy_serial
phy = pyprofibus.phy_serial.CpPhySerial(
debug=(self.debug >= 2),
port=self.phyDev
)
elif phyType in {"dummyslave", "dummy_slave", "dummy-slave"}:
import pyprofibus.phy_dummy
phy = pyprofibus.phy_dummy.CpPhyDummySlave(
debug=(self.debug >= 2)
)
else:
raise PbConfError("Invalid phyType parameter value: "
"%s" % self.phyType)
phy.setConfig(baudrate=self.phyBaud,
rtscts=self.phyRtsCts,
dsrdtr=self.phyDsrDtr)
return phy
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