gpio.conf(5) [netbsd man page]

GPIO.CONF(5)						      BSD File Formats Manual						      GPIO.CONF(5)

NAME

     gpio.conf -- GPIO config file

DESCRIPTION

     The gpio.conf file is read by the gpio rc.d script during system start-up and shutdown, and is intended for configuring GPIO pins.

   FILE FORMAT
     Lines starting with a hash ('#') and empty lines are ignored.  All other lines are passed to gpioctl(8).

FILES

     /etc/gpio.conf	The gpio.conf configuration file resides in /etc.

     /etc/rc.d/gpio	rc.d(8) script that parses gpio.conf.

EXAMPLES

     In this example, if the /etc/gpio.conf config file is present pin 1 of /dev/gpio0 is set as output and named "error_led".

	   # Program pin 1 of /dev/gpio0 as output and name it "error_led"
	   gpio0 1 set out error_led

SEE ALSO

     gpioctl(8), rc(8)

BSD
								  August 1, 2009							       BSD

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