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
|
# This wrapper is for windows or direct access via CANAL API. Socket CAN is recommended under Unix/Linux systems
from ctypes import *
from struct import *
import logging
# import collections
logging.basicConfig(filename='can2usb.log', level=logging.DEBUG)
# type definitions
flags = c_ulong
pConfigureStr = c_char_p
handle = c_long
timeout = c_ulong
filter = c_ulong
# flags mappings
IS_ERROR_FRAME = 4
IS_REMOTE_FRAME = 2
IS_ID_TYPE = 1
class CanalStatistics(Structure):
_fields_ = [('ReceiveFrams', c_ulong),
('TransmistFrams', c_ulong),
('ReceiveData', c_ulong),
('TransmitData', c_ulong),
('Overruns', c_ulong),
('BusWarnings', c_ulong),
('BusOff', c_ulong)]
stat = CanalStatistics
class CanalStatus(Structure):
_fields_ = [('channel_status', c_ulong),
('lasterrorcode', c_ulong),
('lasterrorsubcode', c_ulong),
('lasterrorstr', c_byte * 80)]
# data type for the CAN Message
class CanalMsg(Structure):
_fields_ = [('flags', c_ulong),
('obid', c_ulong),
('id', c_ulong),
('sizeData', c_ubyte),
('data', c_ubyte * 8),
('timestamp', c_ulong)]
msg = CanalMsg
class usb2can:
def __init__(self):
self.__m_dllBasic = windll.LoadLibrary("usb2can.dll")
if self.__m_dllBasic == None:
logging.warning('DLL failed to load')
def CanalOpen(self, pConfigureStr, flags):
try:
res = self.__m_dllBasic.CanalOpen(pConfigureStr, flags)
return res
except:
logging.warning('Failed to open')
raise
def CanalClose(self, handle):
try:
res = self.__m_dllBasic.CanalClose(handle)
return res
except:
logging.warning('Failed to close')
raise
def CanalSend(self, handle, msg):
try:
res = self.__m_dllBasic.CanalSend(handle, msg)
return res
except:
logging.warning('Sending error')
raise
def CanalReceive(self, handle, msg):
try:
res = self.__m_dllBasic.CanalReceive(handle, msg)
return res
except:
logging.warning('Receive error')
raise
def CanalBlockingSend(self, handle, msg, timeout):
try:
res = self.__m_dllBasic.CanalBlockingSend(handle, msg, timeout)
return res
except:
logging.warning('Blocking send error')
raise
def CanalBlockingReceive(self, handle, msg, timeout):
try:
res = self.__m_dllBasic.CanalBlockingReceive(handle, msg, timeout)
return res
except:
logging.warning('Blocking Receive Failed')
raise
def CanalGetStatus(self, handle, CanalStatus):
try:
res = self.__m_dllBasic.CanalGetStatus(handle, CanalStatus)
return res
except:
logging.warning('Get status failed')
raise
def CanalGetStatistics(self, handle, CanalStatistics):
try:
res = self.__m_dllBasic.CanalGetStatistics(handle, CanalStatistics)
return res
except:
logging.warning('Get Statistics failed')
raise
def CanalGetVersion(self):
try:
res = self.__m_dllBasic.CanalGetVersion()
return res
except:
logging.warning('Failed to get version info')
raise
def CanalGetDllVersion(self):
try:
res = self.__m_dllBasic.CanalGetDllVersion()
return res
except:
logging.warning('Failed to get DLL version')
raise
def CanalGetVendorString(self):
try:
res = self.__m_dllBasic.CanalGetVendorString()
return res
except:
logging.warning('Failed to get vendor string')
raise
|
