GPIOOW(4) FreeBSD Kernel Interfaces Manual GPIOOW(4)
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
gpio(4), intro(4), onewire(4)
HISTORY
The gpioow driver first appeared in OpenBSD 4.0.
AUTHORS
The gpioow driver was written by Alexander Yurchenko
<
[email protected]>.
FreeBSD 14.1-RELEASE-p8 July 16, 2013 FreeBSD 14.1-RELEASE-p8