pio interrupt not working

Have you checked the PIO settings in the SOPC builder/Qsys?

this example is from the Nios II software developers handbook

Example 8–1. An ISR to Service a Button PIO Interrupt

# include "system.h"

# include "altera_avalon_pio_regs.h"

# include "alt_types.h"

# ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT

static void handle_button_interrupts(void* context)

# else

static void handle_button_interrupts(void* context, alt_u32 id)

# endif

{

/* Cast context to edge_capture's type. It is important that this

be declared volatile to avoid unwanted compiler optimization. */

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

/*

* Read the edge capture register on the button PIO.

* Store value.

*/

*edge_capture_ptr =

IORD_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE);

/* Write to the edge capture register to reset it. */

IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0);

/* Read the PIO to delay ISR exit. This is done to prevent a

spurious interrupt in systems with high processor -> pio

latency and fast interrupts. */

IORD_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE);