📄 mpu401.htm
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<TITLE>MPU-401
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<FONT FACE="Verdana" SIZE=5><H2>MPU-401
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<P><span style="color:#FF0000;font-size:10pt;font-family:Arial">[This is preliminary
documentation and subject to change.]</span></P>
<H3>SUMMARY</H3></FONT><FONT FACE="Verdana" SIZE=2><P>
This WDM driver implements standard functionality for an MPU-401 device. The driver is extremely small
because it leverages code built into PortCls. It simply specifies and connects the appropriate
port and miniport, which already exist in PortCls. The Msmpu401 driver is used by audio devices when
the MPU-401 hardware is on a separate devnode from other audio functionality. If the MPU-401 shares
a devnode with other subdevices (such as PCM wave, in the Sb16 device), the built-in DMusUART miniport
can still be used, but an adapter that handles multiple subdevices must be written. The Sb16 sample
illustrates how this can be done.
<P>
If the built-in miniport is insufficient, a custom miniport can be built to handle any additional
functionality. There are a number of miniport samples in the DDK: the Dmusuart, Ddksynth, Fmsynth and
Uart samples show how to build miniports that interface to the DMus and MIDI ports; Sb16 and Ac97
include custom wave miniports. Additionally, the Ddksynth, Sb16 and Ac97 samples contain the necessary
code to connect the custom miniport into the driver. If you choose to pursue this, try to follow the
sample as closely as possible. You will prevent unnecessary complexity by taking advantage of what
PortCls will do for you.
<P>
This sample is compliant with x86, Alpha, iA64, and AXP64 platforms.
This driver builds properly with Microsoft® Visual C® 6.0. Since the driver is a PortCls client, it is compliant with Plug and Play and Power
Management. There are no known issues with this driver.<P>
<H3>BUILDING THE SAMPLE</H3></FONT><FONT FACE="Verdana"
SIZE=2><P>
To build this sample, enter the free or checked build environment and run <B>build</B> from the 98ddk\src\audio
directory, rather than the mpu401 subdirectory. This sample links with Stdunk.lib, which is also built if you run
build from 98ddk\src\audio. Once built, this sample produces msmpu401.sys. In addition to the files in the
directory, the following files are needed to build this sample:<p>
Portcls.lib<br>
Libcntpr.lib<br>
Ksguid.lib<br>
Stdunk.lib<br>
Dmusicks.h<br>
Dmusprop.h<br>
Dmusbuff.h<br>
Ks.h<br>
Ksdebug.h<br>
Ksmedia.h<br>
Portcls.h<br>
Unknown.h<br>
Wdm.h<p>
<H3>CODE TOUR</H3>
<H4>File Manifest</H4>
</FONT><U><PRE>File		Description
</U>
Adapter.cpp	Source file
Makefile	Standard Windows NT makefile
Mpu401.rc	Resource file
Sources		Dependency and include file
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<FONT FACE="MS Sans Serif" SIZE=1><P>© Microsoft Corporation 1999</FONT><FONT FACE="Verdana" SIZE=2> </P></FONT></BODY>
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