VC_WriteIOMemoryBYTE

VC_WriteIOMemoryBYTE(p, b)

The VC_WriteIOMemoryBYTE macro writes a single byte into a device’s mapped I/O memory space.

Parameters

p

Address of the mapped I/O memory location into which data is to be copied.

b

Byte value to be written.

Return Value

None.

Comments

Kernel-mode video capture drivers typically use the VC_WriteIOMemoryBYTE macro to write into a location within the frame buffer. Drivers can obtain the frame buffer’s base address by calling VC_GetFrameBuffer.

Using the VC_WriteIOMemoryBYTE macro to write into I/O space helps ensure driver portability across system platforms.