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The RtReadPort* calls read data directly from an I/O port. Each function reads a different number of bytes of data.
Syntax
UCHAR RtReadPortUchar(
PUCHAR PortAddress
);USHORT RtReadPortUshort(
PUSHORT PortAddress
);ULONG RtReadPortUlong(
PULONG PortAddress
);
Parameters
PortAddress
A Port I/O address cast as a pointer to the type of data to be read.
Remarks
These calls read directly from an I/O port and return the data. RtReadPortUchar reads a single byte, RtReadPortUshort reads two bytes, and RtReadPortUlong reads four bytes of data at a time.
Requirements
| Header | Rtapi.h |
| Library | Rtx_Rtss.lib |
See Also:
RtReadPortBuffer* (Uchar, Ushort, Ulong)