Mercurial > ~darius > hgwebdir.cgi > EG-ZigBee

comparison __init__.py @ 2:1e65aca0f39c

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- Refactor use of struct.unpack() for greater clarity. - Fix logging of checksum errors.
author darius@midget.dons.net.au
date Mon, 29 Oct 2007 10:44:26 +1030
parents c978dbb7e4b8
children afd270964f5b
comparison
equal deleted inserted replaced
1:93b375e93fe1 2:1e65aca0f39c
83 self.serial.close() 83 self.serial.close()
84 self.serial = None 84 self.serial = None
85 85
86 86
87 def HandleChar(self, ch): 87 def HandleChar(self, ch):
88 chint = struct.unpack('B', ch)[0]
88 if (self.state == 'init'): 89 if (self.state == 'init'):
89 if (ch != '\x7e'): 90 if (ch != '\x7e'):
90 return 91 return
91 92
92 self.state = 'sizemsb' 93 self.state = 'sizemsb'
93 return 94 return
94 95
95 elif (self.state == 'sizemsb'): 96 elif (self.state == 'sizemsb'):
96 self.bufszmsb = struct.unpack('B', ch)[0] 97 self.bufszmsb = chint
97 self.state = 'sizelsb' 98 self.state = 'sizelsb'
98 return 99 return
99 100
100 elif (self.state == 'sizelsb'): 101 elif (self.state == 'sizelsb'):
101 self.bufszlsb = struct.unpack('B', ch)[0] 102 self.bufszlsb = chint
102 self.dataleft = self.bufszmsb << 8 | self.bufszlsb 103 self.dataleft = self.bufszmsb << 8 | self.bufszlsb
103 104
104 self.state = 'data' 105 self.state = 'data'
105 return 106 return
106 107
107 elif (self.state == 'data'): 108 elif (self.state == 'data'):
108 self.buffer.append(struct.unpack('B', ch)[0]) 109 self.buffer.append(chint)
109 self.dataleft = self.dataleft - 1 110 self.dataleft = self.dataleft - 1
110 if (self.dataleft == 0): 111 if (self.dataleft == 0):
111 self.state = 'cksum' 112 self.state = 'cksum'
112 return 113 return
113 114
114 elif (self.state == 'cksum'): 115 elif (self.state == 'cksum'):
115 cksum = reduce(lambda x, y: x + y, self.buffer) & 0xff 116 pktsum = reduce(lambda x, y: x + y, self.buffer) & 0xff
116 rxcksum = struct.unpack('B', ch)[0] 117 rxcksum = chint
117 if (cksum + rxcksum != 0xff): 118 if (pktsum + rxcksum != 0xff):
118 self.PrintError("Bad checksum, got 0x%02x, expected 0x%02x" % 119 self.PrintError("Bad checksum, got 0x%02x, expected 0x%02x" %
119 cksum, 0xff - cksum) 120 rxcksum, 0xff - pktsum)
120 else: 121 else:
121 self.PrintError("Triggered event: " + str(self.buffer)) 122 self.PrintError("Triggered event: " + str(self.buffer))
122 self.TriggerEvent(str(self.buffer)) 123 self.TriggerEvent(str(self.buffer))
123 self.buffer = [] 124 self.buffer = []
124 self.state = 'init' 125 self.state = 'init'