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GPIOOW(4) Device Drivers Manual GPIOOW(4)

NAME

gpioow1-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 <grange@openbsd.org>.
July 16, 2013 OpenBSD-current