GPIOOW(4) BSD Kernel Interfaces Manual GPIOOW(4)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>.
BSD July 19, 2009 BSD
Check Out this Related Man Page
ONEWIRE(4) BSD Kernel Interfaces Manual ONEWIRE(4)NAME
onewire -- 1-Wire bus
SYNOPSIS
onewire* at gpioow?
option ONEWIREVERBOSE
DESCRIPTION
1-Wire bus was originally developed by Dallas Semiconductor for connecting integrated circuits. It is commonly used for connecting devices
such as electronic keys, EEPROMs, temperature sensors, real-time clocks, security chips, etc.
The onewire driver provides a uniform programming interface layer between 1-Wire master controllers and various 1-Wire slave devices. Each
1-Wire master controller attaches a onewire framework; several slave devices can then be attached to the onewire bus.
The driver supports plugging and unplugging slave devices on the fly.
SUPPORTED MASTERS gpioow(4) 1-Wire bus bit-banging through GPIO pin
SUPPORTED SLAVES owtemp(4) temperature family type device
SEE ALSO intro(4)HISTORY
The onewire driver first appeared in OpenBSD 4.0 and NetBSD 4.0.
AUTHORS
The onewire driver was written by Alexander Yurchenko <grange@openbsd.org> and ported to NetBSD by Jeff Rizzo <riz@NetBSD.org>.
BSD April 4, 2006 BSD
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