114 lines
3.7 KiB
Groff
114 lines
3.7 KiB
Groff
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.\" $NetBSD: spi.4,v 1.1 2006/10/09 16:51:51 gdamore Exp $
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.\"
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.\" Copyright (c) 2006 Urbana-Champaign Independent Media Center.
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.\" Copyright (c) 2006 Garrett D'Amore.
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.\" All rights reserved.
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.\"
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.\" Portions of this code were written by Garrett D'Amore for the
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.\" Champaign-Urbana Community Wireless Network Project.
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.\"
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.\" Redistribution and use in source and binary forms, with or
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.\" without modification, are permitted provided that the following
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.\" conditions are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above
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.\" copyright notice, this list of conditions and the following
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.\" disclaimer in the documentation and/or other materials provided
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.\" with the distribution.
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.\" 3. All advertising materials mentioning features or use of this
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.\" software must display the following acknowledgements:
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.\" This product includes software developed by the Urbana-Champaign
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.\" Independent Media Center.
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.\" This product includes software developed by Garrett D'Amore.
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.\" 4. Urbana-Champaign Independent Media Center's name and Garrett
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.\" D'Amore's name may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
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.\" MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
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.\" MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 9, 2006
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.Dt SPI 4
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.Os
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.Sh NAME
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.Nm spi
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.Nd introduction to machine-independent SPI bus support and drivers
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.Sh SYNOPSIS
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.Cd "spi* at mainbus?"
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.Pp
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Other attachments are machine-dependent and will depend on the bus topology
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of your system.
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See
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.Xr intro 4
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for your system for more information.
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.Sh DESCRIPTION
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.Nx
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includes a machine dependent
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.Tn SPI
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(Serial Peripherial Interface) bus subsystem, and several different
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machine-independent
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.Tn SPI
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device drivers.
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.Pp
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Your system may support additional machine-dependent SPI devices. Consult
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your system's
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.Xr intro 4
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for additional information.
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.Pp
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.Tn SPI
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is a 4-wire synchronous full-duplex serial bus. Some systems provide
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support for
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.Tn Microwire ,
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which is
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.Tn Philips'
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name for a strict subset of SPI, with more rigidly defined signaling.
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Therefore,
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.Tn Microwire
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devices are also supported by the
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.Tn SPI
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framework.
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.Pp
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Note that when referencing
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.Tn SPI
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devices in a
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.Xr config 8
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file, the
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.Sq slave
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must be provided, as
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.Tn SPI
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lacks any way to automatically probe devices.
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.Sh HARDWARE
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.Nx
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includes the following machine-independent
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.Tn SPI
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drivers
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.Bl -tag -width pcdisplay -offset indent
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.It m25p
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STMicroelectronics M25P family of NOR flash devices.
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.It tm121temp
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Texas Instruments TMP121 temperature sensor.
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.El
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.Sh SEE ALSO
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.Xr m25p 4 ,
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.Xr tm121temp 4
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.Sh HISTORY
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The machine-independent
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.Tn SPI
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framework was written by
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.An Garrett D'Amore
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for the
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Champaign-Urbana Community Wireless Network Project (CUWiN), and
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appeared in
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.Nx 4.0 .
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