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What is volatile keyword in embedded C ? Explain with example? What is the difference between typedef and #define?
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asked by: thechosen on: Aug 3, 2009 Answers ( 10 )
The volatile keyword is used to define memory mapped I/O device's register (or Hardware registers) variables which indicates to the compiler
For example:
int i;
&i 0x1234;
i 0;
delay();
if(i){ //Here the Compiler removes this code by optimization
some statements // because 'i' is already assigned with 0 so..
}
if you declare 'i' as volatile then compiler doesn't optimize.
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