Answer Posted / anonimos

volatile variables are used on RT Embedded systems to
interface a physical memory mapped/IO mapped cell on the
computer board (volatile pointer).

Example define IO port:
#define PortA (*(volatile unsigned char *)0x3b)
unsigned char inputValue=PortA;

optimization may attempt to perform paging to hard drive of
to cache or even CPU registers so when reading from the
physical location in Mem/IO space the program will actually
read old value that was paged/cached by optimization
algorithm of the computer/board, even after the Input
changed on this Memory/IO cell.

volatile instruct the compiler to prevent optimization by
caching to registers/cache.

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