gpiopwm(4) [netbsd man page]

GPIOPWM(4)						   BSD Kernel Interfaces Manual 						GPIOPWM(4)

NAME

     gpiopwm -- support for pulsing GPIO pins in software

SYNOPSIS

     gpiopwm* at gpio? offset ? mask 1
     gpiopwm* at gpio?

DESCRIPTION

     The gpiopwm driver allows for pulsing GPIO pins in software using the callout(9) facility.  The pulse frequency and duty cycle are specified
     indirectly by setting an ``on'' and ``off'' period, in ticks.  Both values are accessible as sysctl(3) variables.

SYSCTL VARIABLES

     The following sysctl(3) variables are used to define the pulsing:

     hw.gpiopwmN.off
		   Define the ``off'' period in ticks.

     hw.gpiopwmN.on
		   Define the ``on'' period in ticks.

     Only when both the ``on'' and the ``off'' period are set to values higher than zero pulsing will start.  To stop the pulsing, set either
     value to zero.

EXAMPLES

     To pulse a pin on a machine with 100 ticks/second with a frequency of 1Hz and a duty cycle of 20%, the ``on'' period must be set to 20 and
     the ``off'' period must be set to 80.  The following example will pulse the error LED of a Soekris net4801 with a frequency of 1 Hz and a
     duty cycle of 20%:

     # gpioctl gpio0 20 set pp
     # gpioctl gpio0 attach gpiopwm 20 1
     # sysctl -w hw.gpiopwm0.off=80
     # sysctl -w hw.gpiopwm0.on=20

SEE ALSO

     gpio(4), intro(4), gpioctl(8), sysctl(8)

HISTORY

     The gpiopwm driver first appeared in NetBSD 6.0.

AUTHORS

     The gpiopwm driver was written by Marc Balmer <marc@msys.ch>.

BSD
								 November 13, 2011							       BSD

GPIOCTL(1)						    BSD General Commands Manual 						GPIOCTL(1)

NAME

     gpioctl -- GPIO control utility

SYNOPSIS

     gpioctl -l [-f ctldev] [-v]
     gpioctl -t [-f ctldev] pin
     gpioctl -c [-f ctldev] pin flag [flag ...]
     gpioctl [-f ctldev] pin [0|1]

DESCRIPTION

     The gpioctl utility could be used to manage GPIO pins from userland and list available pins.

     The options are as follows:

     -c pin flag [flag ...]
		Configure pin by setting provided flags. The following flags are currently defined:

		      IN     Input pin

		      OUT    Output pin

		      OD     Open drain pin

		      PP     Push pull pin

		      TS     Tristate pin

		      PU     Pull-up pin

		      PD     Pull-down pin

		      II     Inverted input pin

		      IO     Inverted output pin

     -f ctldev	GPIO controller device to use If not specified, defaults to /dev/gpioc0

     -l 	list available pins

     -t pin	toggle value of provided pin number

     -v 	be verbose: for each listed pin print current configuration

EXAMPLES

     o	 List pins available on GPIO controller defined by device /dev/gpioc0

	 gpioctl -f /dev/gpioc0 -l

     o	 Set the value of pin 12 to 1

	 gpioctl -f /dev/gpioc0 12 1

     o	 Configure pin 12 to be input pin

	 gpioctl -f /dev/gpioc0 -c 12 IN

SEE ALSO

     gpio(4), gpioiic(4), gpioled(4)

HISTORY

     The gpioctl utility appeared in FreeBSD 9.0.

AUTHORS

     The gpioctl utility and this manual page were written by Oleksandr Tymoshenko <gonzo@freebsd.org>.

BSD
								 November 7, 2013							       BSD