2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
6 ## This program is free software; you can redistribute it and/or modify
7 ## it under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 2 of the License, or
9 ## (at your option) any later version.
11 ## This program is distributed in the hope that it will be useful,
12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ## GNU General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with this program; if not, see <http://www.gnu.org/licenses/>.
20 import sigrokdecode as srd
22 class Decoder(srd.Decoder):
26 longname = 'Melexis MLX90614'
27 desc = 'Melexis MLX90614 infrared thermometer protocol.'
31 tags = ['IC', 'Sensor']
33 ('celsius', 'Temperature / °C'),
34 ('kelvin', 'Temperature / K'),
37 ('temps-celsius', 'Temperature / °C', (0,)),
38 ('temps-kelvin', 'Temperature / K', (1,)),
45 self.state = 'IGNORE START REPEAT'
49 self.out_ann = self.register(srd.OUTPUT_ANN)
52 self.put(self.ss, self.es, self.out_ann, data)
54 # Quick hack implementation! This needs to be improved a lot!
55 def decode(self, ss, es, data):
59 if self.state == 'IGNORE START REPEAT':
60 if cmd != 'START REPEAT':
62 self.state = 'IGNORE ADDRESS WRITE'
63 elif self.state == 'IGNORE ADDRESS WRITE':
64 if cmd != 'ADDRESS WRITE':
66 self.state = 'GET TEMPERATURE'
67 elif self.state == 'GET TEMPERATURE':
68 if cmd != 'DATA WRITE':
70 if len(self.data) == 0:
71 self.data.append(databyte)
73 elif len(self.data) == 1:
74 self.data.append(databyte)
77 kelvin = (self.data[0] | (self.data[1] << 8)) * 0.02
78 celsius = kelvin - 273.15
79 self.putx([0, ['Temperature: %3.2f °C' % celsius]])
80 self.putx([1, ['Temperature: %3.2f K' % kelvin]])
81 self.state = 'IGNORE START REPEAT'