GPIOOW(4) BSD Kernel Interfaces Manual GPIOOW(4)
gpioow -- 1-Wire bus bit-banging through GPIO pin
gpioow* at gpio? offset 0 mask 0x1
gpioow* at gpio?
onewire* at gpioow?
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.
gpio(4), intro(4), onewire(4)
The gpioow driver first appeared in OpenBSD 4.0.
The gpioow driver was written by Alexander Yurchenko
BSD July 16, 2013 BSD