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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, write to the Free Software | |
18 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | ## | |
20 | ||
21 | # Melexis MLX90614 Infrared Thermometer protocol decoder | |
22 | ||
23 | import sigrokdecode as srd | |
24 | ||
25 | class Decoder(srd.Decoder): | |
26 | api_version = 1 | |
27 | id = 'mlx90614' | |
28 | name = 'MLX90614' | |
29 | longname = 'Melexis MLX90614' | |
30 | desc = 'Infrared Thermometer protocol.' | |
31 | license = 'gplv2+' | |
32 | inputs = ['i2c'] | |
33 | outputs = ['mlx90614'] | |
34 | probes = [] | |
35 | optional_probes = [] | |
36 | options = {} | |
37 | annotations = [ | |
38 | ['Celsius', 'Temperature in degrees Celsius'], | |
39 | ['Kelvin', 'Temperature in Kelvin'], | |
40 | ] | |
41 | ||
42 | def __init__(self, **kwargs): | |
43 | self.state = 'IGNORE START REPEAT' | |
44 | self.data = [] | |
45 | ||
46 | def start(self, metadata): | |
47 | # self.out_proto = self.add(srd.OUTPUT_PROTO, 'mlx90614') | |
48 | self.out_ann = self.add(srd.OUTPUT_ANN, 'mlx90614') | |
49 | ||
50 | def report(self): | |
51 | pass | |
52 | ||
53 | def putx(self, data): | |
54 | self.put(self.ss, self.es, self.out_ann, data) | |
55 | ||
56 | # Quick hack implementation! This needs to be improved a lot! | |
57 | def decode(self, ss, es, data): | |
58 | cmd, databyte = data | |
59 | ||
60 | # State machine. | |
61 | if self.state == 'IGNORE START REPEAT': | |
62 | if cmd != 'START REPEAT': | |
63 | return | |
64 | self.state = 'IGNORE ADDRESS WRITE' | |
65 | elif self.state == 'IGNORE ADDRESS WRITE': | |
66 | if cmd != 'ADDRESS WRITE': | |
67 | return | |
68 | self.state = 'GET TEMPERATURE' | |
69 | elif self.state == 'GET TEMPERATURE': | |
70 | if cmd != 'DATA WRITE': | |
71 | return | |
72 | if len(self.data) == 0: | |
73 | self.data.append(databyte) | |
74 | self.ss = ss | |
75 | elif len(self.data) == 1: | |
76 | self.data.append(databyte) | |
77 | self.es = es | |
78 | else: | |
79 | kelvin = (self.data[0] | (self.data[1] << 8)) * 0.02 | |
80 | celsius = kelvin - 273.15 | |
81 | self.putx([0, ['Temperature: %3.2f °C' % celsius]]) | |
82 | self.putx([1, ['Temperature: %3.2f K' % kelvin]]) | |
83 | self.state = 'IGNORE START REPEAT' | |
84 | self.data = [] | |
85 | else: | |
86 | raise Exception('Invalid state: %s' % self.state) | |
87 |