How can I correctly assign a pointer to a call back function?

I try to call a function in a IRQ with C, with the next code I get it.

static void (*functionPulsacion)();

void eint2_init(void *funcPulsacion){
    functionPulsacion = funcPulsacion;
}

But when I compile in Keil the IDE show me the next message:

Button2.c(38): warning: #513-D: a value of type "void " cannot be assigned to an entity of type "void ()()"

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What is the good way for do this?.

Thank you in advance

>Solution :

It’s the same syntax for the parameter variable as for the static one.

static void (*functionPulsacion)(void);

void eint2_init(void (*funcPulsacion)(void)) {
    functionPulsacion = funcPulsacion;
}

Typedefs make function pointers a lot more readable, though.

typedef void (*PulsacionFunc)(void);

static PulsacionFunc pulsacion_func;

void eint2_init(PulsacionFunc a_pulsacion_func) {
   pulsacion_func = a_pulsacion_func;
}