USB Interrupts with usb.c and 18F4550

[Tonwo222]

Hi.

I want to do a program that add 2 numbers from the PC and return the result. Ive already done this:

void add() {

usb_init();
usb_task();
usb_wait_for_enumeration();

while (TRUE)
{
if(usb_enumerated())
{
if (usb_kbhit(1)) {
usb_get_packet(1, recibe, 2);

resultado = recibe[1] + recibe[0];

usb_put_packet(1, resultado, 1, USB_DTS_TOGGLE); }

}
}
}

And works fine.

Now i need to do with interrupts, like this:

#int_usb
void add() ...


But the driver usb.c controls the interrupts, how can i do it? I need to change something in the usb.c but i dont know why.

Anybody could help me? Is there any other way easier?

Thanks a lot and sorry for my English.