$OpenBSD: gpioow.4,v 1.7 2013/07/16 16:05:48 schwarze Exp $
Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.Dd $Mdocdate: November 24 2008 $ .Dt GPIOOW 4 .Os .Sh NAME .Nm gpioow .Nd 1-Wire bus bit-banging through GPIO pin .Sh SYNOPSIS .Cd "gpioow* at gpio? offset 0 mask 0x1" .Cd "gpioow* at gpio?" .Cd "onewire* at gpioow?" .Sh DESCRIPTION The .Nm 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.
Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.Dd $Mdocdate: November 24 2008 $ .Dt GPIOOW 4 .Os .Sh NAME .Nm gpioow .Nd 1-Wire bus bit-banging through GPIO pin .Sh SYNOPSIS .Cd "gpioow* at gpio? offset 0 mask 0x1" .Cd "gpioow* at gpio?" .Cd "onewire* at gpioow?" .Sh DESCRIPTION The .Nm 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.
p The pin number can be specified in the kernel configuration with the .Ar offset locator. The .Ar mask locator should always be 0x1 in this case. The .Ar offset and .Ar mask can also be specified when .Nm is attached at runtime using the .Dv GPIOATTACH .Xr ioctl 2 on the .Xr gpio 4 device. .Sh SEE ALSO .Xr gpio 4 , .Xr intro 4 , .Xr onewire 4 .Sh HISTORY The .Nm driver first appeared in .Ox 4.0 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An Alexander Yurchenko Aq Mt grange@openbsd.org .