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Asked: 2026-05-31T08:30:12+00:00

I’m working on a embedded application where I need to declare an array of

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I’m working on a embedded application where I need to declare an array of function pointers on a fixed memory address and then use it in different .c files. What I came up with is this:

typedef void(__irq __arm  * p_intr_handler_t)(void);

p_intr_handler_t * IntTable =  (p_intr_handler_t *)&VIM_RAM_BASE;
p_intr_handler_t IntTable[95];

VIM_RAM_BASE is the address. I delcare this in main.f file and I need to use it in various .c files, so I declared it like this:

extern p_intr_handler_t IntTable[95];

But whilst trying to compile I get an error message:
“declaration is incompatible with “p_intr_handler_t *IntTable” (declared at line 3)”
that message goes for both the normal and the extern declaration.

Any ideas what’s wrong?

Thanks

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1 Answer

  1. Editorial Team

    Why are you redeclaring IntTable with a different type?

    Just jeep the first definition in a single .c, and create an extern for it in a .h to be included in the other .c, like this:

    extern p_intr_handler_t * IntTable;

    Obviously this works only if VIM_RAM_BASE is already somehow reserved for your data (i.e. the compiler won’t try to put there other data), otherwise you should check out your compiler’s documentation to see if there’s a way to tell it to put a variable at a specific place in memory.

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