// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API UCHAR VideoPortReadPortUchar(
  PUCHAR Port
);
View the official Windows Driver Kit DDI reference

NtDoc

No description available.

Edit description on GitHub

Windows Driver Kit DDI reference (nf-video-videoportreadportuchar)

VideoPortReadPortUchar function

Description

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

VideoPortReadPortUchar - NtDoc