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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
import serial
import os
from time import localtime, strftime, sleep
MAP_FILE = 'map_machine_ids.txt'
LOG_FILE = '../log/sbhserr.log'
OUTGOING_MACHINE_ID = 252
INCOMING_FAN = 253
INCOMING_HEAT = 254
OUTGOING_TEMP = 255
MAX_HEAT = 100
MAX_FAN = 100
class Sbhs:
""" This is the Single Board Heater System class """
def __init__(self):
# status of the board
# 0 = not connected
# 1 = connected
self.machine_id = 26
self.device_num = 26
self.boardcon = False
self.status = 0
def connect(self, machine_id):
""" Open a serial connection via USB to the SBHS using the machine id """
# check for valid machine id number
try:
self.machine_id = int(machine_id)
except:
#with open('error.txt', 'w') as errrr:
# errrr.write('Invalid machine id specified % d' % self.machine_id)
return False
# get the usb device file from the machine map file
try:
map_file = open(MAP_FILE, 'r')
usb_device_file = False
for mapping_str in map_file.readlines():
mapping = mapping_str.split('=')
# if mapping for the machine id found set the usb device file and break out of loop
if mapping[0] == str(self.machine_id):
usb_device_file = mapping[1].strip()
break
# reached end of file and check if machine id entry is present in the machine map file
map_file.close()
if not usb_device_file:
print 'Error: cannot locate the USB device in the map table for machine id %d' % self.machine_id
self.log('cannot locate the USB device in the map table for machine id %d' % self.machine_id, 'ERROR')
return False
except:
# map_file.close()
print 'Error: cannot get the USB device path for the machine id %d' % self.machine_id
self.log('cannot get the USB device path for the machine id %d' % self.machine_id, 'ERROR')
return False
# check if SBHS device is connected
if not os.path.exists(usb_device_file):
print 'SBHS device file ' + usb_device_file + ' does not exists'
self.log('SBHS device file ' + usb_device_file + ' does not exists', 'ERROR')
return False
try:
self.boardcon = serial.Serial(port=usb_device_file, baudrate=9600, bytesize=8, parity='N', stopbits=1, timeout=2) #orignal stopbits = 1
self.status = 1
return True
except:
print 'Error: cannot connect to machine id %d' % self.machine_id
self.log('cannot connect to machine id %d' % self.machine_id, 'ERROR')
self.machine_id = -1
self.device_num = -1
self.boardcon = False
self.status = 0
return False
def connect_device(self, device_num):
""" Open a serial connection via USB to the SBHS using USB Device Number"""
# check for valid device number
try:
self.device_num = int(device_num)
except:
print 'Invalid device number specified'
return False
usb_device_file = '/dev/ttyUSB%d' % self.device_num
# check if SBHS device is connected
if not os.path.exists(usb_device_file):
print 'SBHS device file ' + usb_device_file + ' does not exists'
self.log('SBHS device file ' + usb_device_file + ' does not exists', 'ERROR')
return False
try:
self.boardcon = serial.Serial(port=usb_device_file, baudrate=9600, bytesize=8, parity='N', stopbits=1, timeout=2) # org stopbits = 1
self.machine_id = self.getMachineId()
return True
except:
print 'Error: cannot connect to device %s' % usb_device_file
self.log('cannot connect to device %s' % usb_device_file, 'ERROR')
return False
def setHeat(self, val):
""" Set the heat """
if val > MAX_HEAT or val < 0:
print 'Error: heat value cannot be more than %d' % MAX_HEAT
return False
try:
self._write(chr(INCOMING_HEAT))
self._write(chr(val))
return True
except:
print 'Error: cannot set heat for machine id %d' % self.machine_id
self.log('cannot set heat for machine id %d' % self.machine_id, 'ERROR')
return False
def setFan(self, val):
""" Set the fan """
if val > MAX_FAN or val < 0:
print 'Error: fan value cannot be more than %d' % MAX_FAN
return False
try:
self._write(chr(INCOMING_FAN))
self._write(chr(val))
return True
except:
print 'Error: cannot set fan for machine id %d' % self.machine_id
self.log('cannot set fan for machine id %d' % self.machine_id, 'ERROR')
return False
def getTemp(self):
""" Get the temperature """
try:
self.boardcon.flushInput()
self._write(chr(OUTGOING_TEMP))
temp = ord(self._read(1)) + (0.1 * ord(self._read(1)))
return temp
except:
print 'Error: cannot read temperature from machine id %d' % self.machine_id
self.log('cannot read temperature from machine id %d' % self.machine_id, 'ERROR')
return 0.0
def getMachineId(self):
""" Get machine id from the device """
try:
self.boardcon.flushInput()
self._write(chr(OUTGOING_MACHINE_ID))
sleep(0.5) # sleep before reading machine id
machine_id = ord(self._read(1))
return machine_id
except:
print 'Error: cannot read machine id from %s' % self.boardcon.port
self.log('cannot read machine id from %s' % self.boardcon.port, 'ERROR')
return -1
def disconnect(self):
""" Reset the board fan and heat values and close the USB connection """
try:
self.boardcon.close()
self.boardcon = False
self.status = 0
return True
except:
print 'Error: cannot close connection to the machine'
self.log('cannot close connection to the machine', 'ERROR')
return False
def reset_board(self):
self.setFan(100)
self.setHeat(0)
def _read(self, size):
try:
data = self.boardcon.read(size)
return data
except:
print 'Error: cannot read from machine id %d' % self.machine_id
self.log('cannot read from machine id %d' % self.machine_id, 'ERROR')
raise Exception
def _write(self, data):
try:
self.boardcon.write(data)
return True
except:
print 'Error: cannot write to machine id %d' % self.machine_id
self.log('cannot write to machine id %d' % self.machine_id, 'ERROR')
raise Exception
def log(self, msg, level):
try:
errfile = open(LOG_FILE, 'a') # open error log file in append mode
if not errfile:
return
log_msg = '%s %s %s\n' %(level, strftime('%d:%m:%Y %H:%M:%S', localtime()), msg)
errfile.write(log_msg)
errfile.close()
return
except:
return
|
