void promptSDcard(struct Env* p, alt_up_sd_card_dev* device_reference) {
/*
* Loading Screen if SD card is not presented
*/
int frame = 25;
struct animation* b = initAnimation((int*)pacman01, 1);
addImage(b, initAnimation((int*)pacman02, 0));
addImage(b, initAnimation((int*)pacman03, 0));
addImage(b, initAnimation((int*)pacman04, 0));
struct Object *face;
face= initObject(80, 120, 10, b, NULL);
addToEnv(p, face);
alt_alarm_start (&alarm,alt_ticks_per_second(),my_alarm_callback,(void*)p);
while(!loadSDCard(device_reference)) {
displayString("Please insert the SD card to start", frame, 30);
frame++;
setXY(face, face->x+4, face->y);
if(face->x >245) face->x = 0;
if(frame > 61) frame = 0;
usleep(300000);
}alt_up_char_buffer_clear(char_buffer);
killAnimation(b);
removeFromEnv(p, face);
alt_alarm_stop(&alarm);
alt_up_pixel_buffer_dma_clear_screen(pixel_buffer, 0);
}
void alt_tick (void)
{
alt_alarm* next;
alt_alarm* alarm = (alt_alarm*) alt_alarm_list.next;
alt_u32 next_callback;
/* update the tick counter */
_alt_nticks++;
/* process the registered callbacks */
while (alarm != (alt_alarm*) &alt_alarm_list)
{
next = (alt_alarm*) alarm->llist.next;
/*
* Upon the tick-counter rolling over it is safe to clear the
* roll-over flag; once the flag is cleared this (or subsequnt)
* tick events are enabled to generate an alarm event.
*/
if ((alarm->rollover) && (_alt_nticks == 0))
{
alarm->rollover = 0;
}
/* if the alarm period has expired, make the callback */
if ((alarm->time <= _alt_nticks) && (alarm->rollover == 0))
{
next_callback = alarm->callback (alarm->context);
/* deactivate the alarm if the return value is zero */
if (next_callback == 0)
{
alt_alarm_stop (alarm);
}
else
{
alarm->time += next_callback;
/*
* If the desired alarm time causes a roll-over, set the rollover
* flag. This will prevent the subsequent tick event from causing
* an alarm too early.
*/
if(alarm->time < _alt_nticks)
{
alarm->rollover = 1;
}
}
}
alarm = next;
}
/*
* Update the operating system specific timer facilities.
*/
ALT_OS_TIME_TICK();
}
