Posible Problem with ISR Edge PIO

Here is working example of edge capture

volatile int edge_capture_coin;

static void handle_coin_interrupts(void* context, alt_u32 id)

{

/* 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;

/* Store the value in the Button's edge capture register in *context. */

*edge_capture_ptr = IORD_ALTERA_AVALON_PIO_EDGE_CAP(COIN_IN_BASE);

/* Reset the Button's edge capture register. */

IOWR_ALTERA_AVALON_PIO_EDGE_CAP(COIN_IN_BASE, 0);

}

static void init_coin_in_pio()

{

/* Recast the edge_capture pointer to match the alt_irq_register() function

* prototype. */

void* edge_capture_ptr = (void*) &edge_capture_coin;

/* Enable all 8 ways interrupts. */

IOWR_ALTERA_AVALON_PIO_IRQ_MASK(COIN_IN_BASE, 0xff);

/* Reset the edge capture register. */

IOWR_ALTERA_AVALON_PIO_EDGE_CAP(COIN_IN_BASE, 0x0);

/* Register the interrupt handler. */

alt_irq_register( COIN_IN_IRQ, edge_capture_ptr, handle_coin_interrupts );

}

void coin()

{

int i,j;

int exit=1;

char ch;

init_coin_in_pio();

while(1)

{

if (edge_capture_coin!=0)

{

switch (edge_capture_coin)

{

case ACC_COIN0 : printf("\ncoin_in0 - ok"); break;

case ACC_COIN1 : printf("\ncoin_in1 - ok"); break;

case ACC_COIN2 : printf("\ncoin_in2 - ok"); break;

case ACC_COIN3 : printf("\ncoin_in3 - ok"); break;

case ACC_COIN4 : printf("\ncoin_in4 - ok"); break;

case ACC_COIN5 : printf("\ncoin_in5 - ok"); break;

case ACC_COIN6 : printf("\ncoin_in6 - ok"); break;

case ACC_COIN7 : printf("\ncoin_in7 - ok"); break;

}

edge_capture_coin=0;

}

}

}