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1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2019 Ben Dooks <ben.dooks@codethink.co.uk> | |
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 | MAX_CHANNELS = 8 | |
23 | ||
24 | class Decoder(srd.Decoder): | |
25 | api_version = 3 | |
26 | id = 'tdm_audio' | |
27 | name = 'TDM audio' | |
28 | longname = 'Time division multiplex audio' | |
29 | desc = 'TDM multi-channel audio protocol.' | |
30 | license = 'gplv2+' | |
31 | inputs = ['logic'] | |
32 | outputs = [] | |
33 | tags = ['Audio'] | |
34 | channels = ( | |
35 | { 'id': 'clock', 'name': 'Bitclk', 'desc': 'Data bit clock' }, | |
36 | { 'id': 'frame', 'name': 'Framesync', 'desc': 'Frame sync' }, | |
37 | { 'id': 'data', 'name': 'Data', 'desc': 'Serial data' }, | |
38 | ) | |
39 | options = ( | |
40 | {'id': 'bps', 'desc': 'Bits per sample', 'default': 16 }, | |
41 | {'id': 'channels', 'desc': 'Channels per frame', 'default': MAX_CHANNELS }, | |
42 | {'id': 'edge', 'desc': 'Clock edge to sample on', 'default': 'rising', 'values': ('rising', 'falling') } | |
43 | ) | |
44 | annotations = tuple(('ch%d' % i, 'Ch%d' % i) for i in range(MAX_CHANNELS)) | |
e144452b | 45 | annotation_rows = tuple(('ch%d-vals' % i, 'Ch%d' % i, (i,)) for i in range(MAX_CHANNELS)) |
a276d9d6 BD |
46 | |
47 | def __init__(self): | |
48 | self.reset() | |
49 | ||
50 | def reset(self): | |
51 | self.samplerate = None | |
52 | self.channels = MAX_CHANNELS | |
53 | self.channel = 0 | |
54 | self.bitdepth = 16 | |
55 | self.bitcount = 0 | |
56 | self.samplecount = 0 | |
57 | self.lastsync = 0 | |
58 | self.lastframe = 0 | |
59 | self.data = 0 | |
60 | self.ss_block = None | |
61 | ||
62 | def metdatadata(self, key, value): | |
63 | if key == srd.SRD_CONF_SAMPLERATE: | |
64 | self.samplerate = value | |
65 | ||
66 | def start(self): | |
67 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
68 | self.bitdepth = self.options['bps'] | |
69 | self.edge = self.options['edge'] | |
70 | ||
71 | def decode(self): | |
72 | while True: | |
73 | # Wait for edge of clock (sample on rising/falling edge). | |
74 | clock, frame, data = self.wait({0: self.edge[0]}) | |
75 | ||
76 | self.data = (self.data << 1) | data | |
77 | self.bitcount += 1 | |
78 | ||
79 | if self.ss_block is not None: | |
80 | if self.bitcount >= self.bitdepth: | |
81 | self.bitcount = 0 | |
82 | self.channel += 1 | |
83 | ||
84 | c1 = 'Channel %d' % self.channel | |
85 | c2 = 'C%d' % self.channel | |
86 | c3 = '%d' % self.channel | |
87 | if self.bitdepth <= 8: | |
88 | v = '%02x' % self.data | |
89 | elif self.bitdepth <= 16: | |
90 | v = '%04x' % self.data | |
91 | else: | |
92 | v = '%08x' % self.data | |
93 | ||
94 | if self.channel < self.channels: | |
95 | ch = self.channel | |
96 | else: | |
97 | ch = 0 | |
98 | ||
99 | self.put(self.ss_block, self.samplenum, self.out_ann, | |
100 | [ch, ['%s: %s' % (c1, v), '%s: %s' % (c2, v), | |
101 | '%s: %s' % (c3, v)]]) | |
102 | self.data = 0 | |
103 | self.ss_block = self.samplenum | |
104 | self.samplecount += 1 | |
105 | ||
106 | # Check for new frame. | |
107 | # Note, frame may be a single clock, or active for the first | |
108 | # sample in the frame. | |
109 | if frame != self.lastframe and frame == 1: | |
110 | self.channel = 0 | |
111 | self.bitcount = 0 | |
112 | self.data = 0 | |
113 | if self.ss_block is None: | |
114 | self.ss_block = 0 | |
115 | ||
116 | self.lastframe = frame |