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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

Check Out this Related 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
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