VideoPortReadPortUchar function

The VideoPortReadPortUchar function reads a byte from a mapped I/O port.

Syntax


UCHAR VideoPortReadPortUchar(
   PUCHAR Port
);

Parameters

Port

Pointer to the port. The given Port must be in a mapped I/O-space range returned by VideoPortGetDeviceBase.

Return value

VideoPortReadPortUchar returns the byte read from the adapter.

Remarks

A miniport driver's HwVidInterrupt or HwVidSynchronizeExecutionCallback function can call VideoPortReadPortUchar.

Callers of VideoPortReadPortUchar can be running at any IRQL, provided that the memory pointed to by the Port parameter is resident, mapped device memory.

Requirements

Target platform

Desktop

Version

Available in Windows 2000 and later versions of the Windows operating systems.

Header

Video.h (include Video.h)

Library

Videoprt.lib

DLL

Videoprt.sys

IRQL

See Remarks section.

See also

HwVidInterrupt
HwVidSynchronizeExecutionCallback
VideoPortGetDeviceBase

 

 

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