117 lines
3.0 KiB
Groff
117 lines
3.0 KiB
Groff
.\" $NetBSD: harmony.4,v 1.1 2004/09/22 16:38:26 jkunz Exp $
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.\"
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.\" $OpenBSD: harmony.4,v 1.7 2004/03/15 13:27:48 miod Exp $
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.\"
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.\"
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.\" Copyright (c) 2003 Jason L. Wright (jason@thought.net)
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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 ``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 ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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.\" 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 January 26, 2003
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.Dt HARMONY 4 hp700
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.Os
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.Sh NAME
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.Nm harmony
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.Nd CS4215/AD1849 audio interface
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.Sh SYNOPSIS
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.Cd "harmony* at gsc?"
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.Cd "audio* at harmony?"
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.Sh DESCRIPTION
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The
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.Nm
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device uses the
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.Tn Crystal Semiconductor
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.Tn CS4215
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16-Bit Multimedia Audio Codec
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or
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.Tn Analog Devices
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.Tn AD1849
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.Tn SoundPort(R) Stereo Codec
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chip to implement the audio device interface described in
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.Xr audio 4 .
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This device is found on most
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.Tn HP PA-RISC
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workstations.
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The
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.Nm
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has a maximum precision of 16 bits and has a stereo input and stereo output.
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.Pp
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On
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.Tn HP 9000/712
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models
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.Nm
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also provides two additional channels for an add-on
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card with two fax/voice modems.
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.Pp
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One of the hardware registers reflects the state of the
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.Tn CHI
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bus that is used to communicate with the codec and thus
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being sampled at a low accuracy secondary frequency
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(such as
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.Xr timeout 9 )
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produces poor quality random bit stream that is fed into the
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entropy pool of
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.Xr rnd 4 .
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.Sh MACHINES
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An incomplete list of machines that feature
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.Nm
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audio:
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.Pp
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.Bl -bullet -compact
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.It
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712/*
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.It
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715/*
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.It
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725/*
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.It
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735/*
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.It
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755/*
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.It
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B132L[+], B160L, B180L+
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.It
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C100, C110, C132L, C160[L], C180, C200, C240, C360
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.It
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J200, J210[XC], J280, J282, J2240
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.El
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr audio 4 ,
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.Xr gsc 4 ,
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.Xr intro 4 ,
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.Xr rnd 4
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.Sh HISTORY
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Support for
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.Nm
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first appeared in
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.Ox 3.3 .
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It was ported to
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.Nx 1.6
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by Chuck Silvers.
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.Sh CAVEATS
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To trigger entropy collection
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.Tn CHI
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bus has to be programmed into the data mode that happens once
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a single buffer of data has been played or recorded.
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