why cann't it recive interrupt

[Altera_Forum]

why cann't it recive interrupt,when the key is pressed, the led shows nothing 

# include "system.h"# include "altera_avalon_pio_regs.h"# include "alt_types.h"# include "D:\document\nios\low_cost\h\alt_irq.h"# include <stdio.h># include <unistd.h> volatile int edge_capture;  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); } static void init_button_pio() { void* edge_capture_ptr = (void*) &edge_capture;  /* Enable all 4 button interrupts. */ IOWR_ALTERA_AVALON_PIO_IRQ_MASK(BUTTON_PIO_BASE, 0xf); /* Reset the edge capture register. */ IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0x0); /* Register the interrupt handler. */ alt_irq_register( BUTTON_PIO_IRQ, edge_capture_ptr, handle_button_interrupts );  } int main (void) { IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, 0); # ifdef BUTTON_PIO_BASE init_button_pio();# endif //  while( 1 )  {  if (edge_capture != 0) { IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, 0xf); } } return 0; }

[Altera_Forum]

help me

[Altera_Forum]

Which design (Quartus) are you using?

[Altera_Forum]

If you take a look at a Nios reference design like standard or full, there are interupt buttons as well. Then if you look at the board diagnostic software example you&#39;ll see how the buttons are handled.

[Altera_Forum]

1. I use quartus 

// 2. I refred to the software example,but the button can not handled. // 3. is my program error ????

[Altera_Forum]

I have the same problem 

my system consists of button_pio led_pio onchip_ram the capture register can catch the rising edge and capture&#39;s value can change but the interrup funtionstatic void handle_button_interrupts(void* context, alt_u32 id) can not respone i need help  thank!!!!!!