annotate MonitorDev.py @ 9:f15019afef84

Config file
author darius
date Sat, 29 Sep 2007 14:40:17 +0000
parents 483375ca5d10
children 9d5b291cfd01
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8
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1 #!/usr/bin/env python
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2
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3 ############################################################################
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4 # Monitoring/control interface to hardware for beermon
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5 #
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6 # $Id: MonitorDev.py,v 1.1 2007/09/29 14:39:59 darius Exp $
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7 #
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8 # Depends on: Python 2.3 (I think)
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9 #
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10 ############################################################################
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11 #
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12 # Copyright (C) 2007 Daniel O'Connor. All rights reserved.
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13 #
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14 # Redistribution and use in source and binary forms, with or without
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15 # modification, are permitted provided that the following conditions
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16 # are met:
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17 # 1. Redistributions of source code must retain the above copyright
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18 # notice, this list of conditions and the following disclaimer.
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19 # 2. Redistributions in binary form must reproduce the above copyright
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20 # notice, this list of conditions and the following disclaimer in the
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21 # documentation and/or other materials provided with the distribution.
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22 #
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23 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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24 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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27 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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28 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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29 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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32 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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33 # SUCH DAMAGE.
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34 #
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35 ############################################################################
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36
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37 import threading, re, time, pexpect
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38
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39 class MonitorDev(threading.Thread):
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40 """This class continually polls the hardware for temperature
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41 readings and accepts state changes to heat & cool"""
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42
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43 # Match a ROM ID (eg 00:11:22:33:44:55:66:77)
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44 romre = re.compile('([0-9a-f]{2}:){7}[0-9a-f]{2}')
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45 # Match the prompt
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46 promptre = re.compile('> ')
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47
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48 # Dictionary of sensor IDs & temperatures
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49 temps = {}
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50 # Dictionary of sensor IDs & epoch times
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51 lastUpdate = {}
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52
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53 # List of all device IDs
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54 devs = []
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55 # List of temperature sensor IDs
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56 tempdevs = []
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57
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58 # Lock to gate access to the comms
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59 commsLock = None
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60
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61 currState = 'idle'
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62
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63 lastHeatOn = 0
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64 lastHeatOff = 0
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65 lastCoolOn = 0
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66 lastCoolOff = 0
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67
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68 def __init__(self, _log, conf):
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69 global log
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70 log = _log
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71 threading.Thread.__init__(self)
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72
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73 # Collect parameters
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74 self.coolRelay = conf.getint('hardware', 'coolRelay')
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75 self.heatRelay = conf.getint('hardware', 'heatRelay')
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76 self.fermenterId = conf.get('hardware', 'fermenterId')
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77 self.fridgeId = conf.get('hardware', 'fridgeId')
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78 self.ambientId = conf.get('hardware', 'ambientId')
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79 self.minCoolOnTime = conf.getfloat('hardware', 'minCoolOnTime')
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80 self.minCoolOffTime = conf.getfloat('hardware', 'minCoolOffTime')
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81 self.minHeatOnTime = conf.getfloat('hardware', 'minHeatOnTime')
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82 self.minHeatOffTime = conf.getfloat('hardware', 'minHeatOffTime')
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83 self.minHeatOvershoot = conf.getfloat('hardware', 'minHeatOvershoot')
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84 self.minCoolOvershoot = conf.getfloat('hardware', 'minCoolOvershoot')
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85
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86 # Setup locking & spawn SSH
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87 self.commsLock = threading.Lock()
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88 self.p = pexpect.spawn('/usr/bin/ssh', ['-xt', '-enone', '-i', '/home/darius/.ssh/id_wrt', 'root@wrt', '(echo logged in; microcom -D/dev/cua/1)'])
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89 assert(self.p.expect('logged in') == 0)
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90 self.p.timeout = 3
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91 self.setspeed()
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92
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93 # Search for 1-wire modules
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94 self.devs = self.find1wire()
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95 self.tempdevs = filter(self.istemp, self.devs)
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96
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97 log.debug("fermenterId - %s" % (self.fermenterId))
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98 log.debug("fridgeId - %s" % (self.fridgeId))
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99 log.debug("ambientId - %s" % (self.ambientId))
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100 log.debug("minCoolOnTime - %d, minCoolOffTime - %d" %
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101 (self.minCoolOnTime, self.minCoolOffTime))
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102 log.debug("minHeatOnTime - %d, minHeatOffTime - %d" %
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103 (self.minHeatOnTime, self.minHeatOffTime))
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104 log.debug("minHeatOvershoot - %3.2f, minCoolOvershoot - %3.2f" %
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105 (self.minHeatOvershoot, self.minCoolOvershoot))
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106 self.start()
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107
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108 def setspeed(self):
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109 self.commsLock.acquire()
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110 self.p.send('~')
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111 assert(self.p.expect('t - set terminal') == 0)
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112 self.p.send('t')
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113 assert(self.p.expect('p - set speed') == 0)
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114 self.p.send('p')
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115 assert(self.p.expect('f - 38400') == 0)
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116 self.p.send('f')
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117 assert(self.p.expect('done!') == 0)
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118 self.commsLock.release()
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119
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120 def find1wire(self):
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121 self.commsLock.acquire()
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122 self.p.sendline('')
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123 assert(self.p.expect('> ') == 0)
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124 self.p.sendline('sr')
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125 # Echo
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126 assert(self.p.expect('sr') == 0)
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127
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128 # Send a new line which will give us a command prompt to stop on
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129 # later. We could use read() but that would make the code a lot
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130 # uglier
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131 self.p.sendline('')
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132
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133 devlist = []
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134
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135 # Loop until we get the command prompt (> ) collecting ROM IDs
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136 while True:
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137 idx = self.p.expect([self.romre, self.promptre])
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138 if (idx == 0):
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139 # Matched a ROM
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140 #print "Found ROM " + self.p.match.group()
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141 devlist.append(self.p.match.group(0))
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142 elif (idx == 1):
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143 # Matched prompt, exit
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144 break
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145 else:
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146 # Unpossible!
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147 self.commsLock.release()
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148 raise SystemError()
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149
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150 self.commsLock.release()
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151
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152 return(devlist)
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153
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154 def istemp(self, id):
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155 [family, a, b, c, d, e, f, g] = id.split(':')
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156 if (family == '10'):
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157 return True
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158 else:
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159 return False
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160
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161 def updateTemps(self):
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162 for i in self.tempdevs:
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163 try:
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164 self.temps[i] = float(self.readTemp(i))
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165 self.lastUpdate[i] = time.time()
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166 except OWReadError:
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167 # Ignore this - just results in no update reflected by lastUpdate
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168 pass
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169
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170 return(self.temps)
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171
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172 def readTemp(self, id):
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173 self.commsLock.acquire()
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174 cmd = 'te ' + id
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175 self.p.sendline(cmd)
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176 # Echo
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177 assert(self.p.expect(cmd) == 0)
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178 # Eat EOL left from expect
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179 self.p.readline()
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180
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181 line = self.p.readline().strip()
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182 self.commsLock.release()
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183 # 'CRC mismatch' can mean that we picked the wrong ROM..
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184 if (re.match('CRC mismatch', line) != None):
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185 raise OWReadError
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186
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187 return(line)
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188
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189 def setState(self, state):
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190 if (state == 'cool'):
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191 relay = 1 << self.coolRelay
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192 elif (state == 'heat'):
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193 relay = 1 << self.heatRelay
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194 elif (state == 'idle'):
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195 relay = 0
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196 else:
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197 raise(ValueError)
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198
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199 if (state == self.currState):
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200 return
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201
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202 # Keep track of when we last turned off or on
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203 if (state == 'cool'):
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204 if (self.currState == 'heat'):
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205 self.lastHeatOff = time.time()
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206 self.lastCoolOn = time.time()
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207 elif (state == 'heat'):
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208 if (self.currState == 'cool'):
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209 self.lastCoolOff = time.time()
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210 self.lastHeatOn = time.time()
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211 else:
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212 if (self.currState == 'cool'):
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213 self.lastCoolOff = time.time()
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214 if (self.currState == 'heat'):
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215 self.lastHeatOff = time.time()
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216
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217 self.currState = state
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218
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219 self.commsLock.acquire()
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220 # Need the extra spaces cause the parser in the micro is busted
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221 cmd = 'out c %02x' % relay
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222 self.p.sendline(cmd)
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223 # Echo
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224 assert(self.p.expect(cmd) == 0)
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225 self.commsLock.release()
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226
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227 def polltemps(self, temps):
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228 while True:
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229 for d in temps:
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230 #print d
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231 t = gettemp(p, d)
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232 print "%s -> %s" % (d, t)
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233 print
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234
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235 def run(self):
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236 while True:
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237 self.updateTemps()
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238