READ_PORT_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 READ_PORT_UCHAR function reads a byte from the specified port address.

Syntax

UCHAR READ_PORT_UCHAR(
  [in] IWDFDevice3 *pDevice,
  [in] PUCHAR      Port
);

Parameters

[in] pDevice

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

[in] Port

Specifies the port address, which must be a mapped memory range in I/O space.

Return value

READ_PORT_UCHAR returns the byte that is read from the specified port address.

Remarks

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

Requirements