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# -*- coding: utf-8 -*-
#
# PROFIBUS DP - Communication Processor PHY access library
#
# 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.phy import *
from pyprofibus.fdl import *
from pyprofibus.dp import *
class CpPhyDummySlave(CpPhy):
"""Dummy slave PROFIBUS CP PHYsical layer
"""
def __init__(self, debug = False):
super(CpPhyDummySlave, self).__init__(debug = debug)
self.__pollQueue = []
def __msg(self, message):
if self.debug:
print("CpPhyDummySlave: %s" % message)
def close(self):
"""Close the PHY device.
"""
self.__pollQueue = []
super(CpPhyDummySlave, self).close()
def sendData(self, telegramData, srd):
"""Send data to the physical line.
"""
telegramData = bytearray(telegramData)
self.__msg("Sending %s %s" % ("SRD" if srd else "SDN",
bytesToHex(telegramData)))
self.__mockSend(telegramData, srd = srd)
def pollData(self, timeout = 0):
"""Poll received data from the physical line.
timeout => timeout in seconds.
0 = no timeout, return immediately.
negative = unlimited.
"""
try:
telegramData = self.__pollQueue.pop(0)
except IndexError as e:
return None
self.__msg("Receiving %s" % bytesToHex(telegramData))
return telegramData
def setConfig(self, baudrate = CpPhy.BAUD_9600):
self.__msg("Baudrate = %d" % baudrate)
self.__pollQueue = []
super(CpPhyDummySlave, self).setConfig(baudrate = baudrate)
def __mockSend(self, telegramData, srd):
if not srd:
return
try:
fdl = FdlTelegram.fromRawData(telegramData)
if (fdl.fc & FdlTelegram.FC_REQFUNC_MASK) == FdlTelegram.FC_FDL_STAT:
telegram = FdlTelegram_FdlStat_Con(da = fdl.sa,
sa = fdl.da)
self.__pollQueue.append(telegram.getRawData())
return
dp = DpTelegram.fromFdlTelegram(fdl, thisIsMaster = False)
if DpTelegram_SlaveDiag_Req.checkType(dp):
telegram = DpTelegram_SlaveDiag_Con(da = fdl.sa,
sa = fdl.da)
self.__pollQueue.append(telegram.toFdlTelegram().getRawData())
return
if DpTelegram_SetPrm_Req.checkType(dp):
telegram = FdlTelegram_ack()
self.__pollQueue.append(telegram.getRawData())
return
if DpTelegram_ChkCfg_Req.checkType(dp):
telegram = FdlTelegram_ack()
self.__pollQueue.append(telegram.getRawData())
return
if DpTelegram_DataExchange_Req.checkType(dp):
du = bytearray([ d ^ 0xFF for d in dp.du ])
telegram = DpTelegram_DataExchange_Con(da = fdl.sa,
sa = fdl.da,
du = du)
self.__pollQueue.append(telegram.toFdlTelegram().getRawData())
return
self.__msg("Dropping SRD telegram: %s" % str(fdl))
except ProfibusError as e:
text = "SRD mock-send error: %s" % str(e)
self.__msg(text)
raise PhyError(text)
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