Control Functions
The following functions are available to access Port I/O control services:
- 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.
General Programming Considerations
The RTX64 interfaces are coded in assembly and use the __stdcall convention, indicating that the subroutines handle the stack cleanup. You should not use other calling conventions.
Example
See the Interrupt Management and Port I/O Calls Programming Example in the RTX64 Example Reference. It demonstrates the use of RTX64 interrupt management and port I/O calls.
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