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 is specified in the kernel configuration with the
offset locator. The
mask locator
should always be 0x1. 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 and
NetBSD 4.0.
AUTHORS
The
gpioow driver was written by
Alexander
Yurchenko
<
grange@openbsd.org>
and was ported to
NetBSD by
Jeff
Rizzo
<
riz@NetBSD.org>.