// The interrupt service routine
static void Key_InterruptHandler(void* context, alt_u32 id)
{
pollkey();
/* Write to the edge capture register to reset it. */
IOWR_ALTERA_AVALON_PIO_EDGE_CAP(DE2_PIO_KEYS4_BASE, 0);
/* reset interrupt capability for the Button PIO. */
IOWR_ALTERA_AVALON_PIO_IRQ_MASK(DE2_PIO_KEYS4_BASE, 0xf);
}
void
mydelay_half()
/* sleep until the half-second mark. also works via polling.
also close enough for government work. */
{
static struct timeval curr;
while (1) {
gettimeofday(&curr, NULL);
if (curr.tv_usec >= 500000)
return;
pollkey();
}
}
void
mydelay()
/* sleep until second changes. works via polling. close enough
for government work. */
{
static struct timeval prev;
static struct timeval curr;
gettimeofday(&prev, NULL);
while (1) {
gettimeofday(&curr, NULL);
if (curr.tv_sec > prev.tv_sec)
return;
pollkey();
prev = curr;
}
}