WRITE_PORT_BUFFER_UCHAR function (wudfddi_hwaccess.h)

[Warning: UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2. For more info, see Getting Started with UMDF.]

The WRITE_PORT_BUFFER_UCHAR function writes a number of bytes from a buffer to the specified port.

Syntax

void WRITE_PORT_BUFFER_UCHAR(
  [in] IWDFDevice3 *pDevice,
  [in] PUCHAR      Port,
  [in] PUCHAR      Buffer,
  [in] ULONG       Count
);

Parameters

[in] pDevice

Specifies a pointer to the IWDFDevice3 interface for the device object of the device to access.

[in] Port

A pointer to the port, which must be a mapped memory range in I/O space.

[in] Buffer

A pointer to a buffer from which an array of UCHAR values is to be written.

[in] Count

Specifies the number of bytes to be written to the buffer.

Return value

None

Remarks

The size of the buffer must be large enough to contain at least the specified number of bytes.

For more information, see Reading and Writing to Device Registers in UMDF 1.x Drivers.

Requirements