// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API VOID VideoPortWritePortUchar(
  PUCHAR Port,
  UCHAR  Value
);
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Windows Driver Kit DDI reference (nf-video-videoportwriteportuchar)

VideoPortWritePortUchar function

Description

The VideoPortWritePortUchar function writes a byte to 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.

`Value`

Specifies a byte to be transferred to the adapter.

Return value

None

Remarks

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

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

VideoPortWritePortUchar - NtDoc