Mercurial > ~darius > hgwebdir.cgi > epro

annotate epro.py @ 13:4450cf739263

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Add link to protocol document.
author Daniel O'Connor <darius@dons.net.au>
date Mon, 06 Dec 2021 11:25:51 +1030
parents 0a571da65068
children 60ead9b5fc1b
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1 #!/usr/bin/env python
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2
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3 import logging
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4 import serial
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5 import sys
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6
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7 logger = logging.getLogger('epro')
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8
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9 # View facing ePro from the back
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10 # +---+
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11 # +-| |-|
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12 # | |
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13 # | |
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14 # +-------+
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15 # 1 ... 6
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16 #
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17 # RJ12 plug (Jaycar cable colours)
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18 # 1 white temp out
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19 # 2 black temp in
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20 # 3 red GND
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21 # 4 green TX TTL (5V)
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22 # 5 yellow RX TTL (5V)
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23 # 6 blue VCC (12V)
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24 #
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25 # 2400bps 8E1
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26 # s = serial.Serial('/dev/cu.usbserial-AM01Z7TZ', 2400, parity='E')
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27 #
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28 # Protocol document: https://www.enerdrive.com.au/wp-content/uploads/ePRO-communication-interface-spec-rev.02.pdf
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29
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30 class Packet(object):
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31 MSGTYPE = -1
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32
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33 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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34 self.dstadr = dstadr
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35 self.srcadr = srcadr
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36 self.devid = devid
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37 self.msgtype = msgtype
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38 self.data = data
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39
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40 def __repr__(self):
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41 hdr = "Src: 0x%02x Dst: 0x%02x DevID: 0x%02x MsgType: 0x%02x" % (
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42 self.dstadr, self.srcadr, self.devid, self.msgtype)
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43 # MSGTYPE is overridden for subclasses which also have their own repr so don't dumb data here
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44 if self.MSGTYPE == -1:
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45 hdr += " Data:"
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46 for d in self.data:
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47 hdr += " 0x%02x" % (d)
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48 else:
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49 hdr += " Name: " + self.MSGNAME
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50
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51 return hdr
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52
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53 class MainVoltage(Packet):
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54 """Main Battery Voltage"""
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55 MSGTYPE = 0x60
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56 MSGNAME = "Main Voltage"
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57 LEN = 3
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58
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59 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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60 super(MainVoltage, self).__init__(dstadr, srcadr, devid, msgtype, data)
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61 self.volts = (data[2] & 0x7f | (data[1] & 0x7f) << 7 | (data[0] & 0x03) << 14) / 100.0
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62
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63 def __repr__(self):
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64 s = super(MainVoltage, self).__repr__()
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65 s += ": %.2f V" % (self.volts)
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66 return s
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67
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68 class BatteryCurrent(Packet):
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69 """Main Battery Current"""
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70 MSGTYPE = 0x61
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71 MSGNAME = "Battery Current"
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72 LEN = 3
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73
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74 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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75 super(BatteryCurrent, self).__init__(dstadr, srcadr, devid, msgtype, data)
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76 self.amps = (data[2] & 0x7f | (data[1] & 0x7f) << 7 | (data[0] & 0x3f) << 14) / 100.0
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77 if data[0] & 0x40:
0
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78 self.amps *= -1
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79
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80 def __repr__(self):
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81 s = super(BatteryCurrent, self).__repr__()
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82 s += ": %.2f A" % (self.amps)
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83 return s
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84
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85 class AmpHours(Packet):
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86 """Number of amp hours removed from the battery"""
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87 MSGTYPE = 0x62
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88 MSGNAME = "Amp Hours"
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89 LEN = 3
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90
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91 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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92 super(AmpHours, self).__init__(dstadr, srcadr, devid, msgtype, data)
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93 self.amphrs = (data[2] & 0x7f | (data[1] & 0x7f) << 7 | (data[0] & 0x3f) << 14) / 100.0
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94 if data[0] & 0x40:
0
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95 self.amphrs *= -1
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96
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97 def __repr__(self):
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98 s = super(AmpHours, self).__repr__()
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99 s += ": %.2f Ah" % (self.amphrs)
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100 return s
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101
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102 class StateOfCharge(Packet):
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103 """State of battery charge"""
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104 MSGTYPE = 0x64
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105 MSGNAME = "State Of Charge"
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106 LEN = 3
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107
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108 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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109 super(StateOfCharge, self).__init__(dstadr, srcadr, devid, msgtype, data)
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110 self.soc = (data[2] & 0x7f | (data[1] & 0x7f) << 7 | (data[0] & 0x03) << 14) / 10.0
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111
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112 def __repr__(self):
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113 s = super(StateOfCharge, self).__repr__()
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114 s += ": %.2f%%" % (self.soc)
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115 return s
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116
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117 class TimeRemaining(Packet):
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118 """Time remaining until battery needs charging"""
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119 MSGTYPE = 0x65
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120 MSGNAME = "Time remaining"
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121 LEN = 3
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122
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123 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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124 super(TimeRemaining, self).__init__(dstadr, srcadr, devid, msgtype, data)
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125 self.time = (data[2] & 0x7f | (data[1] & 0x7f) << 7 | (data[0] & 0x3f) << 14)
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126 if data[0] & 0x40:
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127 self.time *= -1
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128
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129 def __repr__(self):
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130 s = super(TimeRemaining, self).__repr__()
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131 s += ": %.2f min" % (self.time)
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132 return s
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133
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134 class BatteryTemperature(Packet):
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135 """Battery temperature (degrees Celcius)"""
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136 MSGTYPE = 0x66
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137 MSGNAME = "Battery Temperature"
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138 LEN = 3
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139
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140 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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141 super(BatteryTemperature, self).__init__(dstadr, srcadr, devid, msgtype, data)
3
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142 self.temp = (data[2] & 0x7f | (data[1] & 0x7f) << 7 | (data[0] & 0x3f) << 14) / 10.0
0
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143 if data[2] & 0x40:
3
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diff changeset
144 self.temp *= -1
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diff changeset
145 if self.temp == -20:
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diff changeset
146 self.temp = None
0
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diff changeset
147
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148 def __repr__(self):
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149 s = super(BatteryTemperature, self).__repr__()
3
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parents: 0
diff changeset
150 if self.temp == None:
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diff changeset
151 s += ": n/a"
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diff changeset
152 else:
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153 s += ": %.2f degC" % (self.temp)
0
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154 return s
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155
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156 class MonitorStatus(Packet):
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157 """Monitor status"""
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158 MSGTYPE = 0x67
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159 MSGNAME = "Monitor Status"
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160 LEN = 3
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161
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162 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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163 super(MonitorStatus, self).__init__(dstadr, srcadr, devid, msgtype, data)
5
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164 self.autosyncvolt = bool(data[0] & 0x10)
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165 self.autosyncamp = bool(data[0] & 0x08)
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166 self.autosyncchrg = bool(data[0] & 0x04)
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167 self.e501compat = bool(data[0] & 0x02)
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168 self.alarmtst = bool(data[0] & 0x01)
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169 self.backlight = bool(data[1] & 0x40)
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170 self.disptst = bool(data[1] & 0x20)
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171 self.tempsense = bool(data[1] & 0x10) # Seems to be inverted from data sheet
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172 self.auxhv = bool(data[1] & 0x08)
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173 self.auxlv = bool(data[1] & 0x04)
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174 self.lock = bool(data[1] & 0x02)
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175 self.mainhv = bool(data[1] & 0x01)
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176 self.mainlv = bool(data[2] & 0x40)
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177 self.lowbatalarm = bool(data[2] & 0x20)
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178 self.batflat = bool(data[2] & 0x10)
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179 self.batfull = bool(data[2] & 0x08)
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180 self.charged = bool(data[2] & 0x04)
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181 self.nosync = bool(data[2] & 0x02)
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parents: 4
diff changeset
182 self.monreset = bool(data[2] & 0x01)
0
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diff changeset
183
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184 def __repr__(self):
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185 s = super(MonitorStatus, self).__repr__()
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186 stats = ( ( "ASV", self.autosyncvolt ), ( "ASA", self.autosyncamp ), ( "ASC" , self.autosyncchrg ),
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187 ( "E501", self.e501compat ), ( "Alarm test", self.alarmtst ), ( "Light", self.backlight ),
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188 ( "Temperature Sensor", self.tempsense ), ( "Aux HV", self.auxhv ), ( "Aux LV", self.auxlv ),
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189 ( "Lock", self.lock ), ( "Main HV", self.mainhv ), ( "Main LV", self.mainlv ),
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190 ( "Low Battery", self.lowbatalarm ), ( "Battery Flat", self.batfull ),
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191 ( "Battery Full", self.batfull ), ( "Battery Charged", self.charged ),
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192 ( "No Sync", self.nosync ), ( "Monitor Reset", self.monreset ) )
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193 for (short, var) in stats:
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diff changeset
194 if var:
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195 s += " %s : True" % (short)
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196 else:
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197 s += " %s : False" % (short)
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diff changeset
198
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199 return s
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diff changeset
200
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201 class AuxVoltage(Packet):
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202 """Aux Battery Voltage"""
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diff changeset
203 MSGTYPE = 0x68
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diff changeset
204 MSGNAME = "Aux Voltage"
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diff changeset
205 LEN = 3
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diff changeset
206
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diff changeset
207 def __init__(self, dstadr, srcadr, devid, msgtype, data):
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diff changeset
208 super(AuxVoltage, self).__init__(dstadr, srcadr, devid, msgtype, data)
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diff changeset
209 self.volts = (data[2] & 0x7f | (data[1] & 0x7f) << 7 | (data[0] & 0x03) << 14) / 100.0
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parents:
diff changeset
210
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diff changeset
211 def __repr__(self):
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parents:
diff changeset
212 s = super(AuxVoltage, self).__repr__()
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parents:
diff changeset
213 s += ": %.2f V" % (self.volts)
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parents:
diff changeset
214 return s
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diff changeset
215
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diff changeset
216 class Processor(object):
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diff changeset
217 PKT_TYPES = { MainVoltage.MSGTYPE : MainVoltage, BatteryCurrent.MSGTYPE : BatteryCurrent,
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Daniel O'Connor <darius@dons.net.au>
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diff changeset
218 AmpHours.MSGTYPE : AmpHours, StateOfCharge.MSGTYPE : StateOfCharge,
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parents:
diff changeset
219 TimeRemaining.MSGTYPE : TimeRemaining, BatteryTemperature.MSGTYPE : BatteryTemperature,
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diff changeset
220 MonitorStatus.MSGTYPE : MonitorStatus, AuxVoltage.MSGTYPE : AuxVoltage }
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parents:
diff changeset
221
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diff changeset
222 def __init__(self):
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diff changeset
223 self.state = 0
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diff changeset
224 self.packets = []
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parents:
diff changeset
225
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diff changeset
226 def process(self, dat):
4
787d9c8fdec6 Add working example when run as an exe
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parents: 3
diff changeset
227 added = False
0
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diff changeset
228 for d in dat:
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diff changeset
229 d = ord(d)
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diff changeset
230 if d == 0xff and self.state != 4:
12
0a571da65068 Use logging rather than print.
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parents: 7
diff changeset
231 logger.warn("Packet corruption")
0
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parents:
diff changeset
232 continue
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parents:
diff changeset
233
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parents:
diff changeset
234 if self.state == 0:
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parents:
diff changeset
235 # Waiting for destination address (MSB set but not 0xff as that is EOM)
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parents:
diff changeset
236 if d == 0xff or d & 0x80 == 0:
12
0a571da65068 Use logging rather than print.
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parents: 7
diff changeset
237 logger.info("Skipping byte")
0
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parents:
diff changeset
238 continue
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Daniel O'Connor <darius@dons.net.au>
parents:
diff changeset
239 self.dstadr = d & 0x7f
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Daniel O'Connor <darius@dons.net.au>
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diff changeset
240 self.data = []
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diff changeset
241 self.state += 1
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Daniel O'Connor <darius@dons.net.au>
parents:
diff changeset
242 elif self.state == 1:
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parents:
diff changeset
243 # Source address
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diff changeset
244 self.srcadr = d
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diff changeset
245 self.state += 1
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diff changeset
246 elif self.state == 2:
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parents:
diff changeset
247 # Device ID
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diff changeset
248 self.devid = d
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diff changeset
249 self.state += 1
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diff changeset
250 elif self.state == 3:
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parents:
diff changeset
251 # Message type
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diff changeset
252 self.msgtype = d
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diff changeset
253 self.state += 1
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254 elif self.state == 4:
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255 # Data
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256 if d != 0xff:
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257 self.data.append(d)
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258 continue
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259 self.state = 0
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260 if self.msgtype in Processor.PKT_TYPES:
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261 t = self.PKT_TYPES[self.msgtype]
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262 if len(self.data) != t.LEN:
12
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263 logger.warn("Packet length incorrect, expected %d got %d", t.LEN, len(self.data))
0
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264 continue
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265
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266 p = self.PKT_TYPES[self.msgtype](self.dstadr, self.srcadr, self.devid, self.msgtype, self.data)
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267 else:
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268 p = Packet(self.dstadr, self.srcadr, self.devid, self.msgtype, self.data)
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269
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270 self.packets.append(p)
4
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271 added = True
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272 return added
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273
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274 def main():
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275 if len(sys.argv) != 2:
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276 print('Bad usage')
4
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277 exit(1)
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278
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279 s = serial.Serial(sys.argv[1], 2400, parity='E')
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280 s.timeout = 0.2
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281
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282 p = Processor()
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283 while True:
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284 res = p.process(s.read(1024))
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285 while len(p.packets) > 0:
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286 print(p.packets.pop(0))
0
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287
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288 if __name__ == '__main__':
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289 main()