65 lines
2.1 KiB
Groff
65 lines
2.1 KiB
Groff
.\" $NetBSD: mcp23s17gpio.4,v 1.2 2014/04/07 11:18:13 wiz Exp $
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.\"
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.\"Copyright (c) 2014 Frank Kardel
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.\"All rights reserved.
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.\"
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.\"Redistribution and use in source and binary forms, with or without
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.\"modification, are permitted provided that the following conditions
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.\"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 copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\"THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
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.\"``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\"TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\"PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\"BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\"CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\"SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\"INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\"CONTRACT, 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 ADVISED OF THE
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.\"POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd April 6, 2014
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.Dt MCP23S17GPIO 4
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.Os
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.Sh NAME
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.Nm mcp23s17gpio
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.Nd Driver for MCP23S17 gpio chip via SPI bus
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.Sh SYNOPSIS
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.Cd "mcp23s17gpio0 at spi? slave 0 flags 0"
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.Cd "mcp23s17gpio1 at spi? slave 0 flags 1"
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.Cd "mcp23s17gpio2 at spi? slave 0 flags 2"
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.Cd "mcp23s17gpio3 at spi? slave 0 flags 3"
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.Cd "gpio* at gpiobus?"
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.Sh DESCRIPTION
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The
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.Nm
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driver supports up to 8 instances of the MCP23S17 16-bit GPIO chips.
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Access to the pins is provided by the
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.Xr gpio 4
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interface.
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The
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.Nm
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.Ar flags
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argument selects the hardware address of the chip instance.
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.Sh SEE ALSO
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.Xr gpio 4 ,
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.Xr intro 4 ,
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.Xr spi 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Nx 7.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Frank Kardel Aq Mt kardel@NetBSD.org .
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