Programming
BUF-PCI(PC), BUF-PCI(98)
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Programming Interruption
This product has its own interrupt signal processing capability,
allowing the interrupt request signal within the I/O expansion unit to be
used regardless of the interrupt request signal used by the PC.
Processing interrupt request signals within the I/O expansion unit can
be programmed in two ways; using the message by an interrupt request
event or monitoring the interrupt request status of the
BUF-PCI(PCI) board. The features of these two methods and
programming procedures are explained below.
Both of these two methods cannot be used in one program. For a
realistic example, see the sample programs for Windows.
Using event messages
Entry of an interrupt request is identified using Windows message
processing. The program is the same as typical Windows message
processing. In this method, response to an interrupt request is slow and
the timing by which a message is sent is dependent on the operating
state of the system. In some cases, an interrupt request might be missed
depending on the operating state of the system.
Figure 3.2. Main Routine Programming Procedure