blob: 522acb5afa33ed44bdcc237636b102ccae8c7413 (
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
|
.. SPDX-License-Identifier: GPL-2.0-or-later
.. index::
single: pwm (command)
pwm command
===========
Synopsis
--------
::
pwm invert <pwm_dev_num> <channel> <polarity>
pwm config <pwm_dev_num> <channel> <period_ns> <duty_ns>
pwm enable <pwm_dev_num> <channel>
pwm disable <pwm_dev_num> <channel>
Description
-----------
The ``pwm`` command is used to access and configure PWM (Pulse Width Modulation)
signals.
pwm invert
----------
* If the value of ``polarity`` is 0, the default polarity is used.
* If the value of ``polarity`` is 1, the polarity is inverted.
pwm config
----------
Configure the period and duty period in nanoseconds.
pwm enable
----------
Enable output on the configured device and channel.
pwm disable
-----------
Disable output on the configured device and channel.
pwm_dev_num
Device number of the pulse width modulation device
channel
Output channel of the PWM device
polarity
* 0 - Use normal polarity
* 1 - Use inverted polarity
duty_ns
Duty period in ns
period_ns
Period time in ns
Examples
--------
Configure device 0, channel 0 to 20 µs period and 14 µs (that is, 70%) duty period::
=> pwm config 0 0 20000 14000
Enable output on the configured device and channel::
=> pwm enable 0 0
Disable output on the configured device and channel::
=> pwm disable 0 0
Invert the signal on the configured device and channel::
=> pwm invert 0 0 1
Configuration
-------------
The ``pwm`` command is only available if CONFIG_CMD_PWM=y.
Return value
------------
If the command succeeds, the return value ``$?`` is set to 0. If an error occurs, the
return value ``$?`` is set to 1.
|
