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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2014 Matt Ranostay <mranostay@gmail.com> | |
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 | ( ANN_RGB, ) = range(1) | |
23 | ||
24 | class Decoder(srd.Decoder): | |
25 | api_version = 3 | |
26 | id = 'rgb_led_spi' | |
27 | name = 'RGB LED (SPI)' | |
28 | longname = 'RGB LED string decoder (SPI)' | |
29 | desc = 'RGB LED string protocol (RGB values clocked over SPI).' | |
30 | license = 'gplv2+' | |
31 | inputs = ['spi'] | |
32 | outputs = [] | |
33 | tags = ['Display'] | |
34 | annotations = ( | |
35 | ('rgb', 'RGB value'), | |
36 | ) | |
37 | ||
38 | def __init__(self): | |
39 | self.reset() | |
40 | ||
41 | def reset(self): | |
42 | self.ss_cmd = None | |
43 | self.mosi_bytes = [] | |
44 | ||
45 | def start(self): | |
46 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
47 | ||
48 | def putg(self, ss, es, cls, text): | |
49 | self.put(ss, es, self.out_ann, [cls, text]) | |
50 | ||
51 | def decode(self, ss, es, data): | |
52 | ptype = data[0] | |
53 | ||
54 | # Grab the payload of three DATA packets. These hold the | |
55 | # RGB values (in this very order). | |
56 | if ptype != 'DATA': | |
57 | return | |
58 | _, mosi, _ = data | |
59 | if not self.mosi_bytes: | |
60 | self.ss_cmd = ss | |
61 | self.mosi_bytes.append(mosi) | |
62 | if len(self.mosi_bytes) < 3: | |
63 | return | |
64 | ||
65 | # Emit annotations. Invalidate accumulated details as soon as | |
66 | # they were processed, to prepare the next iteration. | |
67 | ss_cmd, es_cmd = self.ss_cmd, es | |
68 | self.ss_cmd = None | |
69 | red, green, blue = self.mosi_bytes[:3] | |
70 | self.mosi_bytes.clear() | |
71 | rgb_value = int(red) << 16 | int(green) << 8 | int(blue) | |
72 | self.putg(ss_cmd, es_cmd, ANN_RGB, ['#{:06x}'.format(rgb_value)]) |