The
pwm
utility can be used to configure pwm hardware.
pwm
uses a
pwmc(4)
device to communicate with the hardware.
Some PWM hardware supports multiple output channels within a single
controller block; each
pwmc(4)
instance controls a single PWM channel.
pwmc(4)
devices are named
/dev/pwm/pwmcX.Y,
where
X
is the controller unit number and
Y
is the channel number within that unit.
The options are as follows:
|
| -f device
|
| |
Device to operate on.
If not specified,
/dev/pwm/pwmc0.0
is used.
If an unqualified name is provided,
/dev/pwm
is automatically prepended.
|
| -C
|
Show the configuration of the PWM channel.
|
| -D
|
Disable the PWM channel.
|
| -d duty
|
| |
Configure the duty cycle (in nanoseconds or percentage) of the PWM channel.
Duty is the portion of the
period
during which the signal is asserted.
|
| -E
|
Enable the PWM channel.
|
| -p period
|
| |
Configure the period (in nanoseconds) of the PWM channel.
|
| -I
|
Invert PWM signal polarity
|
|
