94 lines
2.9 KiB
Groff
94 lines
2.9 KiB
Groff
.\"
|
|
.\" Copyright (c) 2015 M. Warner Losh
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. The name of the author may not be used to endorse or promote products
|
|
.\" derived from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 22, 2016
|
|
.Dt OWLL 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm owll
|
|
.Nm OWLL_WRITE_ONE ,
|
|
.Nm OWLL_WRITE_ZERO ,
|
|
.Nm OWLL_READ_DATA ,
|
|
.Nm OWLL_REASET_AND_PRESENCE
|
|
.Nd Dallas Semiconductor 1-Wire Link Layer Interface
|
|
.Sh SYNOPSIS
|
|
.Ft int
|
|
.Fn OWLL_WRITE_ONE "device_t lldev" "struct ow_timing *timing"
|
|
.Ft int
|
|
.Fn OWLL_WRITE_ZERO "device_t lldev" "struct ow_timing *timing"
|
|
.Ft int
|
|
.Fn OWLL_READ_DATA "device_t lldev" "struct ow_timing *timing" "int *bit"
|
|
.Ft int
|
|
.Fn OWLL_RESET_AND_PRESENCE "device_t lldev" "struct ow_timing *timing" "int *bit"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
interface provides access to the link layer of the Dallas
|
|
Semiconductor 1-Wire from upper layers of the protocol.
|
|
.Pp
|
|
.Fn OWLL_WRITE_ONE
|
|
and
|
|
.Fn OWLL_WRITE_ZERO
|
|
writes a one bit or a zero bit respectively on the 1-Wire bus.
|
|
.Pp
|
|
.Fn OWLL_READ_DATA
|
|
reads one bit from the 1-Wire bus.
|
|
This is often referred to as a
|
|
.Dq Read Time Slot
|
|
in the 1-Wire device data sheets.
|
|
.Pp
|
|
The
|
|
.Fn OWLL_RESET_AND_PRESENCE
|
|
function starts a reset sequence and detects if any device(s) are
|
|
present on the bus.
|
|
This is the beginning of all 1-Wire transactions.
|
|
.Sh NOTES
|
|
This interface is intended to be used only by the
|
|
.Xr ow 4
|
|
device to talk to the low-level bus.
|
|
By convention, the device that implements this interface is called
|
|
.Xr owc 4 .
|
|
Only devices that implement
|
|
.Xr own 9
|
|
should call these interfaces.
|
|
.Sh SEE ALSO
|
|
.Xr ow 4 ,
|
|
.Xr owc 4 ,
|
|
.Xr own 9
|
|
.Sh LEGAL
|
|
.Tn 1-Wire
|
|
is a registered trademark of Maxim Integrated Products, Inc.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver first appeared in
|
|
.Fx 11.0 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Nm
|
|
device driver and this manual page were written by
|
|
.An Warner Losh .
|