1

#!/usr/bin/env python

     2

# -*- coding: utf-8 -*-

     3

     4

#This file is part of Beremiz, a Integrated Development Environment for

     5

#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 

     6

#

     7

#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

     8

#

     9

#See COPYING file for copyrights details.

    10

#

    11

#This library is free software; you can redistribute it and/or

    12

#modify it under the terms of the GNU General Public

    13

#License as published by the Free Software Foundation; either

    14

#version 2.1 of the License, or (at your option) any later version.

    15

#

    16

#This library is distributed in the hope that it will be useful,

    17

#but WITHOUT ANY WARRANTY; without even the implied warranty of

    18

#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    19

#General Public License for more details.

    20

#

    21

#You should have received a copy of the GNU General Public

    22

#License along with this library; if not, write to the Free Software

    23

#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    24

    25

import ctypes

    26

from LPCAppProto import *

    27

from LPCObject import *

    28

    29

class LPCAppObject(LPCObject):

    30

    def connect(self,comport):

    31

        self.SerialConnection = LPCAppProto(comport,#number

    32

                                         115200, #speed

    33

                                         2)      #timeout

    34

        self.HandleSerialTransaction(IDLETransaction())

    35

    36

    def HandleSerialTransaction(self, transaction):

    37

        if self.SerialConnection is not None:

    38

            try:

    39

                self.PLCStatus, res = self.SerialConnection.HandleTransaction(transaction)

    40

                return res

    41

            except LPCProtoError,e:

    42

                self.pluginsroot.logger.write_error(str(e)+"\n")

    43

                self.SerialConnection = None

    44

                self.PLCStatus = "Disconnected"

    45

                return None

    46

    47

    def StartPLC(self, debug=False):

    48

        self.HandleSerialTransaction(STARTTransaction())

    49

    50

    def StopPLC(self):

    51

        self.HandleSerialTransaction(STOPTransaction())

    52

    53

    def ResetPLC(self):

    54

        self.HandleSerialTransaction(RESETTransaction())

    55

        return self.PLCStatus

    56

    57

    def GetPLCstatus(self):

    58

        self.HandleSerialTransaction(IDLETransaction())

    59

        return self.PLCStatus

    60

    61

    def MatchMD5(self, MD5):

    62

        data = self.HandleSerialTransaction(GET_PLCIDTransaction())

    63

        return data[:32] == MD5

    64

    65

    class IEC_STRING(ctypes.Structure):

    66

        """

    67

        Must be changed according to changes in iec_types.h

    68

        """

    69

        _fields_ = [("len", ctypes.c_uint8),

    70

                    ("body", ctypes.c_char * 126)] 

    71

    72

    TypeTranslator = {"BOOL" :       (ctypes.c_uint8,  lambda x:x.value!=0,     lambda t,x:t(x)),

    73

                      "STEP" :       (ctypes.c_uint8,  lambda x:x.value,        lambda t,x:t(x)),

    74

                      "TRANSITION" : (ctypes.c_uint8,  lambda x:x.value,        lambda t,x:t(x)),

    75

                      "ACTION" :     (ctypes.c_uint8,  lambda x:x.value,        lambda t,x:t(x)),

    76

                      "SINT" :       (ctypes.c_int8,   lambda x:x.value,        lambda t,x:t(x)),

    77

                      "USINT" :      (ctypes.c_uint8,  lambda x:x.value,        lambda t,x:t(x)),

    78

                      "BYTE" :       (ctypes.c_uint8,  lambda x:x.value,        lambda t,x:t(x)),

    79

                      "STRING" :     (IEC_STRING,      lambda x:x.body[:x.len], lambda t,x:t(len(x),x)),

    80

                      "INT" :        (ctypes.c_int16,  lambda x:x.value,        lambda t,x:t(x)),

    81

                      "UINT" :       (ctypes.c_uint16, lambda x:x.value,        lambda t,x:t(x)),

    82

                      "WORD" :       (ctypes.c_uint16, lambda x:x.value,        lambda t,x:t(x)),

    83

                      "WSTRING" :    (None,            None,                    None),#TODO

    84

                      "DINT" :       (ctypes.c_int32,  lambda x:x.value,        lambda t,x:t(x)),

    85

                      "UDINT" :      (ctypes.c_uint32, lambda x:x.value,        lambda t,x:t(x)),

    86

                      "DWORD" :      (ctypes.c_uint32, lambda x:x.value,        lambda t,x:t(x)),

    87

                      "LINT" :       (ctypes.c_int64,  lambda x:x.value,        lambda t,x:t(x)),

    88

                      "ULINT" :      (ctypes.c_uint64, lambda x:x.value,        lambda t,x:t(x)),

    89

                      "LWORD" :      (ctypes.c_uint64, lambda x:x.value,        lambda t,x:t(x)),

    90

                      "REAL" :       (ctypes.c_float,  lambda x:x.value,        lambda t,x:t(x)),

    91

                      "LREAL" :      (ctypes.c_double, lambda x:x.value,        lambda t,x:t(x)),

    92

                      } 

    93

    94

    def SetTraceVariablesList(self, idxs):

    95

        """

    96

        Call ctype imported function to append 

    97

        these indexes to registred variables in PLC debugger

    98

        """

    99

        if idxs:

   100

            buff = ""

   101

            # keep a copy of requested idx

   102

            self._Idxs = idxs[:]

   103

            for idx,iectype,force in idxs:

   104

                idxstr = ctypes.string_at(

   105

                          ctypes.pointer(

   106

                           ctypes.c_uint32(length)),4)

   107

                if force !=None:

   108

                    c_type,unpack_func, pack_func = self.TypeTranslator.get(iectype, (None,None,None))

   109

                    forcedsizestr = chr(ctypes.sizeof(c_type))

   110

                    forcestr = ctypes.string_at(

   111

                                ctypes.pointer(

   112

                                 pack_func(c_type,force)),

   113

                                 forced_type_size)

   114

                    buff += idxstr + forced_type_size_str + forcestr

   115

                else:

   116

                    buff += idxstr + chr(0)

   117

            data = self.HandleSerialTransaction(

   118

                   SET_TRACE_VARIABLETransaction(buff))

   119

        else:

   120

            self._Idxs =  []

   121

   122

    def GetTraceVariables(self):

   123

        """

   124

        Return a list of variables, corresponding to the list of required idx

   125

        """

   126

        offset = 0

   127

        strbuf = self.HandleSerialTransaction(

   128

                                     GET_TRACE_VARIABLETransaction())

   129

        size = len(strbuf) - 4

   130

        if size > 0 and self.PLCStatus == "Started":

   131

            tick = ctypes.cast(

   132

                    ctypes.c_char_p(strbuf[:4]),

   133

                    ctypes.POINTER(ctypes.c_int)).contents

   134

            buffer = ctypes.cast(

   135

                      ctypes.c_char_p(strbuf[4:]),

   136

                      ctypes.c_void_p)

   137

            for idx, iectype, forced in self._Idxs:

   138

                cursor = ctypes.c_void_p(buffer.value + offset)

   139

                c_type,unpack_func, pack_func = self.TypeTranslator.get(iectype, (None,None,None))

   140

                if c_type is not None and offset < size:

   141

                    res.append(unpack_func(ctypes.cast(cursor,

   142

                                                       ctypes.POINTER(c_type)).contents))

   143

                    offset += ctypes.sizeof(c_type)

   144

                else:

   149

                    break

   150

            if offset and offset == size:

   151

                return self.PLCStatus, tick.value, res

   153

        return self.PLCStatus, None, None

   154