MATLAB XPC TARGET 4 - DEVICE DRIVERS Uživatelská příručka Strana 17

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Before Yo u Start
Sele ct poll in g versus i nterrupt.
Specify the blocks for the drivers. Identify
- Input and output ports
- Mask parameters
- Work variables to be shared between driver start, output, and terminate
routines
Determine your timing considerations.
Decide whether you use Inlined functions.
If yes, see the Target Language Compiler documentation of the Real-Time
Workshop.
Driver Types
Standard I/O
Communication
DMA
Interrupt-driven
Bus Types and Register Access
The xPC Target software supports the two standard PC bus types, ISA and
PCI. The ISA bus is a 16-bit bus with an 8 MHz clock. Another form of ISA
bus is the PC/104. The PCI bus is a 32-bit or 64-bit bus with a 33 MHz or 66
MHz clock. Another form of PCI bus is the PC/104+ (PC/104-Plus).
A driver performs I/O accesses through either I/O ports or memory addresses
(memory mapped).
The xPC Target software accesses I/O port addresses for ISA and PCI buses
as follows:
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