2 ## This file is part of the sigrok project.
4 ## Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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.
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.
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
21 def sigrokdecode_count_transitions(inbuf):
22 """Counts the low->high and high->low transitions in the specified
23 channel(s) of the signal."""
27 # FIXME: Get the data in the correct format in the first place.
28 inbuf = [ord(x) for x in inbuf]
30 # TODO: Don't hardcode the number of channels.
33 oldbit = [0] * channels
34 transitions = [0] * channels
35 rising = [0] * channels
36 falling = [0] * channels
43 for i in range(channels):
44 oldbit[i] = (oldbyte & (1 << i)) >> i
46 # Loop over all samples.
47 # TODO: Handle LAs with more/less than 8 channels.
49 # Optimization: Skip identical bytes (no transitions).
52 for i in range(channels):
53 curbit = (s & (1 << i)) >> i
54 # Optimization: Skip identical bits (no transitions).
55 if oldbit[i] == curbit:
57 elif (oldbit[i] == 0 and curbit == 1):
59 elif (oldbit[i] == 1 and curbit == 0):
63 # Total number of transitions is the sum of rising and falling edges.
64 for i in range(channels):
65 transitions[i] = rising[i] + falling[i]
67 outbuf += "Rising edges: "
68 for i in range(channels):
69 outbuf += str(rising[i]) + " "
70 outbuf += "\nFalling edges: "
71 for i in range(channels):
72 outbuf += str(falling[i]) + " "
73 outbuf += "\nTransitions: "
74 for i in range(channels):
75 outbuf += str(transitions[i]) + " "
82 'id': 'transitioncounter',
83 'name': 'Transition counter',
84 'description': 'TODO',
85 'function': 'sigrokdecode_count_transitions',
86 'inputformats': ['raw'],
87 'signalnames': {}, # FIXME
88 'outputformats': ['transitioncounts'],
91 # Use psyco (if available) as it results in huge performance improvements.
94 psyco.bind(sigrokdecode_count_transitions)