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
Thegpioow 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
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>.