Interrupt handling

Hi,

I tried some example programs in Nios 2 using interrupt handling,

i made all the configurations required to generate the interrupt,including whether it is a level or edge and all those stuffs.I used an GPIO to generate an interrupt but whenever i change the state of the input the interrupt is not getting generated i have attached by code below

# include "sys/alt_irq.h"# include "altera_avalon_pio_regs.h"# include "alt_types.h"# include "nios2.h"# define BUTTON_PIO_IRQ 0# define BUTTON_PIO_BASE 0x00000000

volatile int edge_capture;

static void handle_button_interrupts(void* context, alt_u32 id);

void main()

{

void* edge_capture_ptr = (void*) &edge_capture;

NIOS2_WRITE_IENABLE(0xf);

IOWR_ALTERA_AVALON_PIO_IRQ_MASK(BUTTON_PIO_BASE, 0xf);

IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0x0);

alt_irq_register( BUTTON_PIO_IRQ,edge_capture_ptr,handle_button_interrupts);

while(1)

{

}

}

static void handle_button_interrupts(void* context, alt_u32 id)

{

volatile int* edge_capture_ptr = (volatile int*) context;

*edge_capture_ptr = IORD_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE);

IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0);

IOWR_ALTERA_AVALON_PIO_IRQ_MASK(BUTTON_PIO_BASE, 0xf);

}

Thanks in advance

Gowtham