Port IO Functions

The following functions are available to access Port I/O control services:

Control Functions

• RtEnablePortIo enables the direct Port I/O access for the specified range of I/O addresses.
• RtDisablePortIo disables the direct Port I/O access for the specified range of I/O addresses.
• Port I/O Data Transfer functions (described in the following section).

Data Transfer Functions

The following functions are available to access Port I/O data transfer services:

• RtReadPortUchar,RtReadPortUshort,RtReadPortUlong directly reads a one-, two-, or four-byte datum from the specified I/O port.
• RtWritePortUchar,RtWritePortUshort,RtWritePortUlong directly writes a one-, two-, or four-byte datum to the specified I/O port.
• RtReadPortBufferUchar,RtReadPortBufferUshort,RtReadPortBufferUlong copies a series of one-, two-, or four-byte datum from the specified I/O port to a buffer.
• RtWritePortBufferUchar,RtWritePortBufferUshort,RtWritePortBufferUlong copies a one-, two-, or four-byte datum from the specified I/O port to a buffer.