GPIOOW(4) - Device Drivers Manual #
GPIOOW(4) - Device Drivers Manual
NAME #
gpioow - 1-Wire bus bit-banging through GPIO pin
SYNOPSIS #
gpioow* at gpio? offset 0 mask 0x1 gpioow* at gpio? onewire* at gpioow?
DESCRIPTION #
The gpioow driver allows bit-banging a 1-Wire bus as a master using one GPIO pin. The pin is used as a data signal. The GPIO pin must be able to drive an output and read an input.
The pin number can be specified in the kernel configuration with the
offset
locator.
The
mask
locator should always be 0x1 in this case.
The
offset
and
mask
can also be specified when
gpioow
is attached at runtime using the
GPIOATTACH
ioctl(2)
on the
gpio(4)
device.
SEE ALSO #
HISTORY #
The gpioow driver first appeared in OpenBSD 4.0.
AUTHORS #
The gpioow driver was written by Alexander Yurchenko <grange@openbsd.org>.
OpenBSD 7.5 - July 16, 2013