#define VICIRQStatus (*((volatile unsigned long *) 0xFFFFF000))


HI,
can anyone explain me what is meaning of this line?

 

It is defining a variable at a known location to allow access to a mempry mapped register.

This way the compiler knows that VICIRQStatus lives at address 0xFFFFF000, it is an unsigned long quantity, and it can change at any time (volatile).

 

The meaning of this line is that all occurences of "VICIRQStatus" down the text should be replace with "(*((volatile unsigned long *) 0xFFFFF000))" before compiling.

 

Both @ErnieM and @NorthGuy are correct... but in different ways since your question is open to some amount of interpretation.

@NorthGuy answers as to the function of #define.
@ErnieM answers as to the function of the code that is #defined.