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 in degrees Celsius'),
34 ('kelvin', 'Temperature in Kelvin'),
41 self.state = 'IGNORE START REPEAT'
45 self.out_ann = self.register(srd.OUTPUT_ANN)
48 self.put(self.ss, self.es, self.out_ann, data)
50 # Quick hack implementation! This needs to be improved a lot!
51 def decode(self, ss, es, data):
55 if self.state == 'IGNORE START REPEAT':
56 if cmd != 'START REPEAT':
58 self.state = 'IGNORE ADDRESS WRITE'
59 elif self.state == 'IGNORE ADDRESS WRITE':
60 if cmd != 'ADDRESS WRITE':
62 self.state = 'GET TEMPERATURE'
63 elif self.state == 'GET TEMPERATURE':
64 if cmd != 'DATA WRITE':
66 if len(self.data) == 0:
67 self.data.append(databyte)
69 elif len(self.data) == 1:
70 self.data.append(databyte)
73 kelvin = (self.data[0] | (self.data[1] << 8)) * 0.02
74 celsius = kelvin - 273.15
75 self.putx([0, ['Temperature: %3.2f °C' % celsius]])
76 self.putx([1, ['Temperature: %3.2f K' % kelvin]])
77 self.state = 'IGNORE START REPEAT'