Книга: Real-Time Concepts for Embedded Systems

12.4 Points to Remember

12.4 Points to Remember

Some points to remember include the following:

· Interfaces between a device and the main processor occur in two ways: port mapped and memory mapped.

· DMA controllers allows data transfer bypassing the main processor.

· I/O subsystems must be flexible enough to handle a wide range of I/O devices.

· Uniform I/O hides device peculiarities from applications.

· The I/O subsystem maintains a driver table that associates uniform I/O calls with driver-specific I/O routines.

· The I/O subsystem maintains a device table and forms an association between this table and the driver table.

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