blob: 3964d22b7930ccb730f67a4ddd7cda9db69a397a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
.TH pig2vcd 1 2012-2018 Linux "pigpio archive"
.SH NAME
pig2vd - A utility to convert pigpio notifications to VCD.
.SH SYNOPSIS
pig2vcd </dev/pigpioXX >file.VCD
.SH DESCRIPTION
.ad l
.nh
pig2vcd is a utility which reads notifications on stdin and writes the
output as a Value Change Dump (VCD) file on stdout.
.br
.br
The VCD file can be viewed using GTKWave.
.br
.br
.SS Notifications
.br
.br
Notifications consist of 12 bytes with the following binary format.
.br
.br
.EX
typedef struct
.br
{
.br
uint16_t seqno;
.br
uint16_t flags;
.br
uint32_t tick;
.br
uint32_t level;
.br
} gpioReport_t;
.br
.EE
.br
.br
seqno: starts at 0 each time the handle is opened and then increments by one for each report.
.br
.br
flags: two flags are defined, PI_NTFY_FLAGS_WDOG and PI_NTFY_FLAGS_ALIVE. If bit 5 is set (PI_NTFY_FLAGS_WDOG) then bits 0-4 of the flags indicate a gpio which has had a watchdog timeout; if bit 6 is set (PI_NTFY_FLAGS_ALIVE) this indicates a keep alive signal on the pipe/socket and is sent once a minute in the absence of other notification activity.
.br
.br
tick: the number of microseconds since system boot. It wraps around after 1h12m.
.br
.br
level: indicates the level of each gpio. If bit 1<<x is set then gpio x is high. pig2vcd takes these notifications and outputs a text format VCD.
.br
.br
.SS VCD format
.br
.br
The VCD starts with a header.
.br
.br
.EX
$date 2013-05-31 18:49:36 $end
.br
$version pig2vcd V1 $end
.br
$timescale 1 us $end
.br
$scope module top $end
.br
$var wire 1 A 0 $end
.br
$var wire 1 B 1 $end
.br
$var wire 1 C 2 $end
.br
$var wire 1 D 3 $end
.br
$var wire 1 E 4 $end
.br
$var wire 1 F 5 $end
.br
$var wire 1 G 6 $end
.br
$var wire 1 H 7 $end
.br
$var wire 1 I 8 $end
.br
$var wire 1 J 9 $end
.br
$var wire 1 K 10 $end
.br
$var wire 1 L 11 $end
.br
$var wire 1 M 12 $end
.br
$var wire 1 N 13 $end
.br
$var wire 1 O 14 $end
.br
$var wire 1 P 15 $end
.br
$var wire 1 Q 16 $end
.br
$var wire 1 R 17 $end
.br
$var wire 1 S 18 $end
.br
$var wire 1 T 19 $end
.br
$var wire 1 U 20 $end
.br
$var wire 1 V 21 $end
.br
$var wire 1 W 22 $end
.br
$var wire 1 X 23 $end
.br
$var wire 1 Y 24 $end
.br
$var wire 1 Z 25 $end
.br
$var wire 1 a 26 $end
.br
$var wire 1 b 27 $end
.br
$var wire 1 c 28 $end
.br
$var wire 1 d 29 $end
.br
$var wire 1 e 30 $end
.br
$var wire 1 f 31 $end
.br
$upscope $end
.br
$enddefinitions $end
.br
.EE
.br
.br
The header defines gpio identifiers and their name. Each gpio identifier
must be unique. pig2vcd arbitrarily uses 'A' through 'Z' for gpios 0
through 25, and 'a' through 'f' for gpios 26 through 31.
The corresponding names are 0 through 31.
.br
.br
.br
The VCD file may be edited to give a frendlier name, e.g. 8 could be
changed to ENCODER_A if an encoder switch A is connected to gpio 8.
.br
.br
Following the header pig2vcd takes notifications and outputs a timestamp
followed by a list of one or more gpios which have changed state.
The timestamp consists of a '#' followed by the microsecond tick.
The state lines contain the new state followed by the gpio identifier.
.br
.br
.EX
#1058747
.br
0H
.br
0I
.br
#1059012
.br
1H
.br
#1079777
.br
1I
.br
#1079782
.br
0I
.br
#1079852
.br
1I
.br
#1079857
.br
0I
.br
0H
.br
#1165113
.br
1H
.br
#1165118
.br
0H
.br
#1165153
.br
1H
.br
.EE
.SH SEE ALSO
pigpiod(1), pigs(1), pigpio(3), pigpiod_if(3), pigpiod_if2(3)
.SH AUTHOR
joan@abyz.me.uk
|
