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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | ## | |
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. | |
10 | ## | |
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. | |
15 | ## | |
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/>. | |
18 | ## | |
19 | ||
20 | import sigrokdecode as srd | |
21 | ||
22 | class Decoder(srd.Decoder): | |
23 | api_version = 3 | |
24 | id = 'mlx90614' | |
25 | name = 'MLX90614' | |
26 | longname = 'Melexis MLX90614' | |
27 | desc = 'Melexis MLX90614 infrared thermometer protocol.' | |
28 | license = 'gplv2+' | |
29 | inputs = ['i2c'] | |
30 | outputs = [] | |
31 | tags = ['IC', 'Sensor'] | |
32 | annotations = ( | |
33 | ('celsius', 'Temperature / °C'), | |
34 | ('kelvin', 'Temperature / K'), | |
35 | ) | |
36 | annotation_rows = ( | |
37 | ('temps-celsius', 'Temperature / °C', (0,)), | |
38 | ('temps-kelvin', 'Temperature / K', (1,)), | |
39 | ) | |
40 | ||
41 | def __init__(self): | |
42 | self.reset() | |
43 | ||
44 | def reset(self): | |
45 | self.state = 'IGNORE START REPEAT' | |
46 | self.data = [] | |
47 | ||
48 | def start(self): | |
49 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
50 | ||
51 | def putx(self, data): | |
52 | self.put(self.ss, self.es, self.out_ann, data) | |
53 | ||
54 | # Quick hack implementation! This needs to be improved a lot! | |
55 | def decode(self, ss, es, data): | |
56 | cmd, databyte = data | |
57 | ||
58 | # State machine. | |
59 | if self.state == 'IGNORE START REPEAT': | |
60 | if cmd != 'START REPEAT': | |
61 | return | |
62 | self.state = 'IGNORE ADDRESS WRITE' | |
63 | elif self.state == 'IGNORE ADDRESS WRITE': | |
64 | if cmd != 'ADDRESS WRITE': | |
65 | return | |
66 | self.state = 'GET TEMPERATURE' | |
67 | elif self.state == 'GET TEMPERATURE': | |
68 | if cmd != 'DATA WRITE': | |
69 | return | |
70 | if len(self.data) == 0: | |
71 | self.data.append(databyte) | |
72 | self.ss = ss | |
73 | elif len(self.data) == 1: | |
74 | self.data.append(databyte) | |
75 | self.es = es | |
76 | else: | |
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' | |
82 | self.data = [] |