LPCconnector/LPCAppObject.py
author Edouard Tisserant
Thu, 14 Jun 2012 15:24:12 +0200
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#This file is part of Beremiz, a Integrated Development Environment for
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#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 
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#
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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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#
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#See COPYING file for copyrights details.
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#
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#This library is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public
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#License as published by the Free Software Foundation; either
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#version 2.1 of the License, or (at your option) any later version.
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#
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#This library is distributed in the hope that it will be useful,
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#but WITHOUT ANY WARRANTY; without even the implied warranty of
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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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#General Public License for more details.
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#
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#You should have received a copy of the GNU General Public
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#License along with this library; if not, write to the Free Software
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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import ctypes
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from LPCAppProto import *
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from LPCObject import *
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from targets.typemapping import SameEndianessTypeTranslator as TypeTranslator
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class LPCAppObject(LPCObject):
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    def connect(self,comport):
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        self.SerialConnection = LPCAppProto(comport,#number
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                                         115200, #speed
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                                         2)      #timeout
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    def StartPLC(self, debug=False):
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        self.HandleSerialTransaction(STARTTransaction())
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    def StopPLC(self):
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        self.HandleSerialTransaction(STOPTransaction())
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        return True
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    def ResetPLC(self):
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        self.HandleSerialTransaction(RESETTransaction())
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        return self.PLCStatus
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    def GetPLCstatus(self):
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        self.HandleSerialTransaction(GET_PLCIDTransaction())
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        return self.PLCStatus
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    def MatchMD5(self, MD5):
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        data = self.HandleSerialTransaction(GET_PLCIDTransaction())
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        if data is not None:
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            return data[:32] == MD5[:32]
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        return False
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    def SetTraceVariablesList(self, idxs):
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        """
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        Call ctype imported function to append 
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        these indexes to registred variables in PLC debugger
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        """
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        if idxs:
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            buff = ""
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            # keep a copy of requested idx
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            self._Idxs = idxs[:]
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            for idx,iectype,force in idxs:
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                idxstr = ctypes.string_at(
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                          ctypes.pointer(
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                           ctypes.c_uint32(idx)),4)
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                if force !=None:
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                    c_type,unpack_func, pack_func = TypeTranslator.get(iectype, (None,None,None))
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                    forced_type_size = ctypes.sizeof(c_type)
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                    forced_type_size_str = chr(forced_type_size)
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                    forcestr = ctypes.string_at(
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                                ctypes.pointer(
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                                 pack_func(c_type,force)),
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                                 forced_type_size)
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                    buff += idxstr + forced_type_size_str + forcestr
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                else:
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                    buff += idxstr + chr(0)
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        else:
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            buff = ""
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            self._Idxs =  []
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        self.HandleSerialTransaction(SET_TRACE_VARIABLETransaction(buff))
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    def GetTraceVariables(self):
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        """
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        Return a list of variables, corresponding to the list of required idx
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        """
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        offset = 0
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        strbuf = self.HandleSerialTransaction(
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                                     GET_TRACE_VARIABLETransaction())
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        if strbuf is not None and len(strbuf) > 4 and self.PLCStatus == "Started":
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            res=[]
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            size = len(strbuf) - 4
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            tick = ctypes.cast(
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                    ctypes.c_char_p(strbuf[:4]),
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                    ctypes.POINTER(ctypes.c_int)).contents
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            buff = ctypes.cast(
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                      ctypes.c_char_p(strbuf[4:]),
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                      ctypes.c_void_p)
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            for idx, iectype, forced in self._Idxs:
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                cursor = ctypes.c_void_p(buff.value + offset)
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                c_type,unpack_func, pack_func = TypeTranslator.get(iectype, (None,None,None))
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                if c_type is not None and offset < size:
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                    res.append(unpack_func(ctypes.cast(cursor,
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                                                       ctypes.POINTER(c_type)).contents))
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                    offset += ctypes.sizeof(c_type)
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                else:
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                    #if c_type is None:
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                        #PLCprint("Debug error - " + iectype + " not supported !")
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                    #if offset >= size:
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                        #PLCprint("Debug error - buffer too small !")
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                    break
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            if offset and offset == size:
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                return self.PLCStatus, tick.value, res
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            #PLCprint("Debug error - wrong buffer unpack !")
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        return self.PLCStatus, None, [] 
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