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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 | ## | |
922763ab | 20 | import sigrok |
1c6fa20f | 21 | |
922763ab KS |
22 | def decode(l): |
23 | """Counts the low->high and high->low transitions in the specified | |
24 | channel(s) of the signal.""" | |
25 | ||
26 | print(l) | |
27 | sigrok.put(l) | |
28 | ||
29 | def decode2(inbuf): | |
1c6fa20f UH |
30 | """Counts the low->high and high->low transitions in the specified |
31 | channel(s) of the signal.""" | |
32 | ||
d0f3d677 UH |
33 | outbuf = '' |
34 | ||
c11d3c15 UH |
35 | # FIXME: Get the data in the correct format in the first place. |
36 | inbuf = [ord(x) for x in inbuf] | |
37 | ||
d0f3d677 UH |
38 | # TODO: Don't hardcode the number of channels. |
39 | channels = 8 | |
40 | ||
41 | oldbit = [0] * channels | |
42 | transitions = [0] * channels | |
43 | rising = [0] * channels | |
44 | falling = [0] * channels | |
1c6fa20f | 45 | |
a156f09e | 46 | # Initial values. |
c11d3c15 | 47 | oldbyte = inbuf[0] |
a5fdab45 | 48 | for i in range(channels): |
930bd9d9 | 49 | oldbit[i] = (oldbyte & (1 << i)) >> i |
d0f3d677 UH |
50 | |
51 | # Loop over all samples. | |
52 | # TODO: Handle LAs with more/less than 8 channels. | |
53 | for s in inbuf: | |
c11d3c15 UH |
54 | # Optimization: Skip identical bytes (no transitions). |
55 | if oldbyte == s: | |
56 | continue | |
a5fdab45 | 57 | for i in range(channels): |
930bd9d9 | 58 | curbit = (s & (1 << i)) >> i |
c11d3c15 UH |
59 | # Optimization: Skip identical bits (no transitions). |
60 | if oldbit[i] == curbit: | |
61 | continue | |
62 | elif (oldbit[i] == 0 and curbit == 1): | |
d0f3d677 UH |
63 | rising[i] += 1 |
64 | elif (oldbit[i] == 1 and curbit == 0): | |
65 | falling[i] += 1 | |
66 | oldbit[i] = curbit | |
a156f09e | 67 | oldbyte = s |
d0f3d677 UH |
68 | |
69 | # Total number of transitions is the sum of rising and falling edges. | |
a5fdab45 | 70 | for i in range(channels): |
d0f3d677 UH |
71 | transitions[i] = rising[i] + falling[i] |
72 | ||
73 | outbuf += "Rising edges: " | |
a5fdab45 | 74 | for i in range(channels): |
d0f3d677 UH |
75 | outbuf += str(rising[i]) + " " |
76 | outbuf += "\nFalling edges: " | |
a5fdab45 | 77 | for i in range(channels): |
d0f3d677 UH |
78 | outbuf += str(falling[i]) + " " |
79 | outbuf += "\nTransitions: " | |
a5fdab45 | 80 | for i in range(channels): |
d0f3d677 UH |
81 | outbuf += str(transitions[i]) + " " |
82 | outbuf += "\n" | |
1c6fa20f | 83 | |
1c6fa20f UH |
84 | return outbuf |
85 | ||
922763ab KS |
86 | register = { |
87 | 'id': 'transitioncounter', | |
88 | 'name': 'Transition counter', | |
89 | 'longname': '...', | |
90 | 'desc': 'Counts rising/falling edges in the signal.', | |
91 | 'longdesc': '...', | |
92 | 'author': 'Uwe Hermann', | |
93 | 'email': 'uwe@hermann-uwe.de', | |
94 | 'license': 'gplv2+', | |
95 | 'in': ['logic'], | |
96 | 'out': ['transitioncounts'], | |
97 | 'probes': [ | |
98 | # All probes. | |
99 | ], | |
100 | 'options': { | |
101 | # No options so far. | |
102 | }, | |
103 | # 'start': start, | |
104 | # 'report': report, | |
105 | } | |
6fe63193 | 106 | |
887d6cfa UH |
107 | # Use psyco (if available) as it results in huge performance improvements. |
108 | try: | |
109 | import psyco | |
5c55017c | 110 | psyco.bind(decode) |
887d6cfa UH |
111 | except ImportError: |
112 | pass | |
113 |