[This is
preliminary documentation and subject to change.]
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.
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
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.
To build this sample,
enter the free or checked build environment and run build from this
directory. Once built, this sample produces msmpu401.sys. In addition to the
files in the directory, the following files are needed to build this sample:
Portcls.lib
Libcntpr.lib
Ksguid.lib
Stdunk.lib
Dmusicks.h
Dmusprop.h
Dmusbuff.h
Ks.h
Ksdebug.h
Ksmedia.h
Portcls.h
Unknown.h
Wdm.h
File Description