[Prog] Layering hardware specific part in software.

It seems obvious that hardware specific software should be layered with unified interface.
This is very important to portability and debugging. In addition, this can help simulate hardware functionality in other platform – desktop PC. This is something like “Porting to PC”. Programming and debugging on PC platform can increase productivity very much. Can you understand how important this is?
(Please refer “Linux” device driver interface. This is very good example!)

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