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1c6fa20f UH |
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 | ## | |
ad2dc0de | 20 | |
677d597b | 21 | import sigrokdecode as srd |
1c8ac5bf | 22 | |
677d597b | 23 | class Decoder(srd.Decoder): |
2b7d0e2b | 24 | id = 'transitioncounter' |
b41ae47f UH |
25 | name = 'Transition counter' |
26 | longname = '...' | |
27 | desc = 'Counts rising/falling edges in the signal.' | |
28 | longdesc = '...' | |
29 | author = 'Uwe Hermann' | |
30 | email = 'uwe@hermann-uwe.de' | |
31 | license = 'gplv2+' | |
32 | inputs = ['logic'] | |
33 | outputs = ['transitioncounts'] | |
9a12a6e7 | 34 | probes = [] |
b41ae47f | 35 | options = {} |
9a12a6e7 | 36 | annotations = [] |
b41ae47f | 37 | |
3643fc3f | 38 | def __init__(self, **kwargs): |
f9b3b245 | 39 | self.channels = -1 |
b41ae47f | 40 | self.lastsample = None |
b41ae47f | 41 | |
3643fc3f | 42 | def start(self, metadata): |
56202222 UH |
43 | # self.out_proto = self.add(srd.OUTPUT_PROTO, 'transitioncounter') |
44 | self.out_ann = self.add(srd.OUTPUT_ANN, 'transitioncounter') | |
3643fc3f | 45 | |
b41ae47f UH |
46 | def report(self): |
47 | pass | |
48 | ||
862f6f27 | 49 | def decode(self, timeoffset, duration, data): |
b41ae47f | 50 | |
f9b3b245 UH |
51 | for (samplenum, s) in data: |
52 | ||
53 | # ... | |
54 | if self.channels == -1: | |
55 | self.channels = len(s) | |
56 | self.oldbit = [0] * self.channels | |
57 | self.transitions = [0] * self.channels | |
58 | self.rising = [0] * self.channels | |
59 | self.falling = [0] * self.channels | |
b41ae47f UH |
60 | |
61 | # Optimization: Skip identical samples (no transitions). | |
62 | if self.lastsample == s: | |
63 | continue | |
64 | ||
65 | # Upon the first sample, store the initial values. | |
66 | if self.lastsample == None: | |
67 | self.lastsample = s | |
68 | for i in range(self.channels): | |
f9b3b245 | 69 | self.oldbit[i] = self.lastsample[i] |
b41ae47f UH |
70 | |
71 | # Iterate over all channels/probes in this sample. | |
72 | # Count rising and falling edges for each channel. | |
73 | for i in range(self.channels): | |
f9b3b245 | 74 | curbit = s[i] |
ad2dc0de | 75 | # Optimization: Skip identical bits (no transitions). |
b41ae47f | 76 | if self.oldbit[i] == curbit: |
ad2dc0de | 77 | continue |
b41ae47f UH |
78 | elif (self.oldbit[i] == 0 and curbit == 1): |
79 | self.rising[i] += 1 | |
80 | elif (self.oldbit[i] == 1 and curbit == 0): | |
81 | self.falling[i] += 1 | |
82 | self.oldbit[i] = curbit | |
83 | ||
84 | # Save the current sample as 'lastsample' for the next round. | |
85 | self.lastsample = s | |
86 | ||
87 | # Total number of transitions = rising + falling edges. | |
88 | for i in range(self.channels): | |
89 | self.transitions[i] = self.rising[i] + self.falling[i] | |
90 | ||
91 | # TODO: Which output format? | |
92 | # TODO: How to only output something after the last chunk of data? | |
93 | outdata = [] | |
94 | for i in range(self.channels): | |
95 | outdata += [[self.transitions[i], self.rising[i], self.falling[i]]] | |
862f6f27 UH |
96 | |
97 | if outdata != []: | |
c9b24fc3 UH |
98 | # self.put(0, 0, self.out_proto, out_proto) |
99 | self.put(0, 0, self.out_ann, outdata) | |
2b7d0e2b | 100 |