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1 | ## | |
2 | ## This file is part of the sigrok project. | |
3 | ## | |
4 | ## Copyright (C) 2010 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 | # Transition counter protocol decoder | |
22 | ||
23 | import sigrokdecode as srd | |
24 | ||
25 | class Decoder(srd.Decoder): | |
26 | api_version = 1 | |
27 | id = 'transitioncounter' | |
28 | name = 'Transition counter' | |
29 | longname = 'Pin transition counter' | |
30 | desc = 'Counts rising/falling edges in the signal.' | |
31 | license = 'gplv2+' | |
32 | inputs = ['logic'] | |
33 | outputs = ['transitioncounts'] | |
34 | probes = [] | |
35 | optional_probes = [] | |
36 | options = {} | |
37 | annotations = [ | |
38 | ['TODO', 'TODO'], | |
39 | ] | |
40 | ||
41 | def __init__(self, **kwargs): | |
42 | self.channels = -1 | |
43 | self.lastsample = None | |
44 | ||
45 | def start(self, metadata): | |
46 | # self.out_proto = self.add(srd.OUTPUT_PROTO, 'transitioncounter') | |
47 | self.out_ann = self.add(srd.OUTPUT_ANN, 'transitioncounter') | |
48 | ||
49 | def report(self): | |
50 | pass | |
51 | ||
52 | def decode(self, ss, es, data): | |
53 | ||
54 | for (samplenum, s) in data: | |
55 | ||
56 | # ... | |
57 | if self.channels == -1: | |
58 | self.channels = len(s) | |
59 | self.oldbit = [0] * self.channels | |
60 | self.transitions = [0] * self.channels | |
61 | self.rising = [0] * self.channels | |
62 | self.falling = [0] * self.channels | |
63 | ||
64 | # Optimization: Skip identical samples (no transitions). | |
65 | if self.lastsample == s: | |
66 | continue | |
67 | ||
68 | # Upon the first sample, store the initial values. | |
69 | if self.lastsample == None: | |
70 | self.lastsample = s | |
71 | for i in range(self.channels): | |
72 | self.oldbit[i] = self.lastsample[i] | |
73 | ||
74 | # Iterate over all channels/probes in this sample. | |
75 | # Count rising and falling edges for each channel. | |
76 | for i in range(self.channels): | |
77 | curbit = s[i] | |
78 | # Optimization: Skip identical bits (no transitions). | |
79 | if self.oldbit[i] == curbit: | |
80 | continue | |
81 | elif (self.oldbit[i] == 0 and curbit == 1): | |
82 | self.rising[i] += 1 | |
83 | elif (self.oldbit[i] == 1 and curbit == 0): | |
84 | self.falling[i] += 1 | |
85 | self.oldbit[i] = curbit | |
86 | ||
87 | # Save the current sample as 'lastsample' for the next round. | |
88 | self.lastsample = s | |
89 | ||
90 | # Total number of transitions = rising + falling edges. | |
91 | for i in range(self.channels): | |
92 | self.transitions[i] = self.rising[i] + self.falling[i] | |
93 | ||
94 | # TODO: Which output format? | |
95 | # TODO: How to only output something after the last chunk of data? | |
96 | outdata = [] | |
97 | for i in range(self.channels): | |
98 | outdata.append([self.transitions[i], self.rising[i], | |
99 | self.falling[i]]) | |
100 | ||
101 | if outdata != []: | |
102 | # self.put(0, 0, self.out_proto, out_proto) | |
103 | self.put(0, 0, self.out_ann, [0, [str(outdata)]]) | |
104 |