1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
# -*- coding: utf-8 -*-
#
# AWL simulator - PLC core server memory area helpers
#
# Copyright 2013 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.core.compat import *
from awlsim.core.util import *
class MemoryArea(object):
EnumGen.start
TYPE_E = EnumGen.item # input memory
TYPE_A = EnumGen.item # output memory
TYPE_M = EnumGen.item # flags memory
TYPE_L = EnumGen.item # localdata memory
TYPE_DB = EnumGen.item # DB memory
TYPE_T = EnumGen.item # timer
TYPE_Z = EnumGen.item # counter
TYPE_STW = EnumGen.item # status word
EnumGen.end
def __init__(self, memType, flags, index, start, length, data=None):
self.memType = memType
self.flags = flags
self.index = index
self.start = start
self.length = length
self.data = data
def __read_E(self, cpu):
self.data = cpu.inputs[self.start : self.start + self.length]
def __read_A(self, cpu):
self.data = cpu.outputs[self.start : self.start + self.length]
def __read_M(self, cpu):
self.data = cpu.flags[self.start : self.start + self.length]
def __read_L(self, cpu):
self.data = cpu.callStackTop.localdata[self.start : self.start + self.length]
def __read_DB(self, cpu):
try:
db = cpu.dbs[self.index]
except KeyError:
raise AwlSimError("MemoryArea: Read access to "
"nonexistent DB %d" % self.index)
if not (db.permissions & db.PERM_READ):
raise AwlSimError("MemoryArea: Read access to "
"read-protected DB %d" % self.index)
self.data = db.structInstance.dataBytes[self.start : self.start + self.length]
def __read_T(self, cpu):
try:
timer = cpu.timers[self.index]
except IndexError as e:
raise AwlSimError("MemoryArea: Invalid timer index %d" % self.index)
if self.start == 1:
self.data, self.length = b'\x01' if timerget() else b'\x00', 1
elif self.start == 16:
v = timer.getTimevalBin()
self.data, self.length = bytes(((v >> 8) & 0xFF, v & 0xFF)), 2
else:
raise AwlSimError("MemoryArea: Invalid start=%d in timer read. "
"Must be 1 or 16." % self.start)
def __read_Z(self, cpu):
try:
counter = cpu.timers[self.index]
except IndexError as e:
raise AwlSimError("MemoryArea: Invalid counter index %d" % self.index)
if self.start == 1:
self.data, self.length = b'\x01' if counter.get() else b'\x00', 1
elif self.start == 16:
v = counter.getValueBin()
self.data, self.length = bytes(((v >> 8) & 0xFF, v & 0xFF)), 2
else:
raise AwlSimError("MemoryArea: Invalid start=%d in counter read. "
"Must be 1 or 16." % self.start)
def __read_STW(self, cpu):
stw = cpu.statusWord.getWord()
self.data, self.length = bytes(((stw >> 8) & 0xFF, stw & 0xFF)), 2
__readHandlers = {
TYPE_E : __read_E,
TYPE_A : __read_A,
TYPE_M : __read_M,
TYPE_L : __read_L,
TYPE_DB : __read_DB,
TYPE_T : __read_T,
TYPE_Z : __read_Z,
TYPE_STW : __read_STW,
}
def __write_E(self, cpu):
cpu.inputs[self.start : self.start + self.length] = self.data
def __write_A(self, cpu):
cpu.outputs[self.start : self.start + self.length] = self.data
def __write_M(self, cpu):
cpu.flags[self.start : self.start + self.length] = self.data
def __write_DB(self, cpu):
try:
db = cpu.dbs[self.index]
except KeyError:
raise AwlSimError("MemoryArea: Write access to "
"nonexistent DB %d" % self.index)
if not (db.permissions & db.PERM_WRITE):
raise AwlSimError("MemoryArea: Write access to "
"write-protected DB %d" % self.index)
db.structInstance.dataBytes[self.start : self.start + self.length] = self.data
__writeHandlers = {
TYPE_E : __write_E,
TYPE_A : __write_A,
TYPE_M : __write_M,
TYPE_DB : __write_DB,
}
def readFromCpu(self, cpu):
try:
self.__readHandlers[self.memType](self, cpu)
except KeyError:
raise AwlSimError("Invalid MemoryArea memType %d "
"in read operation" % self.memType)
except (IndexError, TypeError) as e:
raise AwlSimError("Invalid MemoryArea read")
def writeToCpu(self, cpu):
try:
self.__writeHandlers[self.memType](self, cpu)
except KeyError:
raise AwlSimError("Invalid MemoryArea memType %d "
"in write operation" % self.memType)
except (IndexError, TypeError) as e:
raise AwlSimError("Invalid MemoryArea write")
# Check whether another area overlaps with this one.
# Doesn't compare the flags.
# Doesn't compare the data.
def overlapsWith(self, other):
if self.memType != other.memType or\
self.index != other.index:
return False
if self.memType in (self.TYPE_T, self.TYPE_Z, self.TYPE_STW):
return self.start == other.start and\
self.length == other.length
if self.length and other.length:
selfEnd = self.start + self.length - 1
otherEnd = other.start + other.length - 1
if selfEnd < other.start or\
otherEnd < self.start:
return False
elif self.length != other.length:
return False # One length is zero and the other isn't
return True
def overlapsWithAny(self, otherMemAreas):
return any(self.overlapsWith(a) for a in otherMemAreas)
def __repr__(self):
return "MemoryArea(memType=%d, flags=0x%02X, index=%d, "\
"start=%d, length=%d, len(data)=%s)" %\
(self.memType, self.flags, self.index,
self.start, self.length,
str(len(self.data)) if self.data is not None else "None")
|
