March 4, 2006 GPIOOW 4

### NAME

gpioow - 1-Wire bus bit-banging through GPIO pin

### SYNOPSIS

gpioow* at gpio? offset 0 mask 0x1 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.

### SEE ALSO

gpio(4), intro(4), onewire(4)

### HISTORY

The gpioow driver first appeared in OpenBSD4.0 and NetBSD4.0.

### AUTHORS

The gpioow driver was written by Alexander Yurchenko <grange@openbsd.org> and was ported to NetBSD by Jeff Rizzo <riz@NetBSD.org>.