2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2014 Torsten Duwe <duwe@suse.de>
5 ## Copyright (C) 2014 Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
7 ## This program is free software; you can redistribute it and/or modify
8 ## it under the terms of the GNU General Public License as published by
9 ## the Free Software Foundation; either version 2 of the License, or
10 ## (at your option) any later version.
12 ## This program is distributed in the hope that it will be useful,
13 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ## GNU General Public License for more details.
17 ## You should have received a copy of the GNU General Public License
18 ## along with this program; if not, see <http://www.gnu.org/licenses/>.
21 import sigrokdecode as srd
22 from collections import deque
24 class SamplerateError(Exception):
27 def normalize_time(t):
29 return '%.3f s (%.3f Hz)' % (t, (1/t))
32 return '%.3f ms (%.3f Hz)' % (t * 1000.0, (1/t))
34 return '%.3f ms (%.3f kHz)' % (t * 1000.0, (1/t)/1000)
35 elif abs(t) >= 0.000001:
37 return '%.3f μs (%.3f kHz)' % (t * 1000.0 * 1000.0, (1/t)/1000)
39 return '%.3f μs (%.3f MHz)' % (t * 1000.0 * 1000.0, (1/t)/1000/1000)
40 elif abs(t) >= 0.000000001:
41 if 1/t/1000/1000/1000:
42 return '%.3f ns (%.3f MHz)' % (t * 1000.0 * 1000.0 * 1000.0, (1/t)/1000/1000)
44 return '%.3f ns (%.3f GHz)' % (t * 1000.0 * 1000.0 * 1000.0, (1/t)/1000/1000/1000)
51 return ['{:.0f}s'.format(t), '{:.0f}'.format(t)]
54 return ['{:.0f}ms'.format(t), '{:.0f}'.format(t)]
57 return ['{:.0f}us'.format(t), '{:.0f}'.format(t)]
60 return ['{:.0f}ns'.format(t), '{:.0f}'.format(t)]
61 return ['{:f}'.format(t = t)]
67 (TIME, TERSE, AVG, DELTA,) = range(4)
69 class Decoder(srd.Decoder):
73 longname = 'Timing calculation with frequency and averaging'
74 desc = 'Calculate time between edges.'
78 tags = ['Clock/timing', 'Util']
80 {'id': 'data', 'name': 'Data', 'desc': 'Data line'},
85 ('average', 'Average'),
89 ('times', 'Times', (Ann.TIME, Ann.TERSE,)),
90 ('averages', 'Averages', (Ann.AVG,)),
91 ('deltas', 'Deltas', (Ann.DELTA,)),
94 { 'id': 'avg_period', 'desc': 'Averaging period', 'default': 100 },
95 { 'id': 'edge', 'desc': 'Edges to check', 'default': 'any', 'values': ('any', 'rising', 'falling') },
96 { 'id': 'delta', 'desc': 'Show delta from last', 'default': 'no', 'values': ('yes', 'no') },
97 { 'id': 'terse', 'desc': 'Show periods in terse format', 'default': 'no', 'values': ('yes', 'no') },
104 self.samplerate = None
106 def metadata(self, key, value):
107 if key == srd.SRD_CONF_SAMPLERATE:
108 self.samplerate = value
111 self.out_ann = self.register(srd.OUTPUT_ANN)
114 if not self.samplerate:
115 raise SamplerateError('Cannot decode without samplerate.')
116 edge = self.options['edge']
117 avg_period = self.options['avg_period']
118 delta = self.options['delta'] == 'yes'
119 terse = self.options['terse'] == 'yes'
125 pin = self.wait({Pin.DATA: 'r'})
126 elif edge == 'falling':
127 pin = self.wait({Pin.DATA: 'f'})
129 pin = self.wait({Pin.DATA: 'e'})
136 t = samples / self.samplerate
139 cls, txt = Ann.TERSE, terse_times(t)
140 self.put(ss, es, self.out_ann, [cls, txt])
142 cls, txt = Ann.TIME, [normalize_time(t)]
143 self.put(ss, es, self.out_ann, [cls, txt])
147 if len(last_n) > avg_period:
149 average = sum(last_n) / len(last_n)
150 cls, txt = Ann.AVG, normalize_time(average)
151 self.put(ss, es, self.out_ann, [cls, [txt]])
153 cls, txt = Ann.DELTA, normalize_time(t - last_t)
154 self.put(ss, es, self.out_ann, [cls, [txt]])