/**
* @brief Attach a RTC interrupt.
* @param interrupt Interrupt number to attach to; this may be any rtc_interrupt_id.
* @param handler Handler to attach to the given interrupt.
* @see rtc_interrupt_id
*/
void rtc_attach_interrupt( uint8 interrupt,
voidFuncPtr handler) {
RTC->handlers[interrupt] = handler;
rtc_enable_irq(interrupt);
switch (interrupt) {
case RTC_SECONDS_INTERRUPT: nvic_irq_enable(NVIC_RTC); break;
case RTC_OVERFLOW_INTERRUPT: nvic_irq_enable(NVIC_RTC); break;
case RTC_ALARM_GLOBAL_INTERRUPT: nvic_irq_enable(NVIC_RTC); break;
case RTC_ALARM_SPECIFIC_INTERRUPT: nvic_irq_enable(NVIC_RTCALARM); break; // The alarm specific interrupt can wake us from deep sleep.
}
}
static void timer_handler(unsigned long data)
{
static int first;
if (!first) {
first = 1;
rtai_cli();
}
CHECK_FLAGS();
while ((ovr = rt_irq_wait_if(TIMER_IRQ)) > 0) {
if (ovr == RT_IRQ_TASK_ERR) return;
if (ovr > 0) {
/* overrun processing, if any, goes here */
rt_sem_signal(dspsem);
}
}
/* normal processing goes here */
intcnt++;
rtc_enable_irq(TIMER_IRQ, TIMER_FRQ);
rt_sem_signal(dspsem);
}
int main(void)
{
RT_TASK *maint;
int maxcnt;
printf("GIVE THE NUMBER OF INTERRUPTS YOU WANT TO COUNT: ");
scanf("%d", &maxcnt);
start_rt_timer(0);
if (!(maint = rt_task_init(nam2num("MAIN"), 1, 0, 0))) {
printf("CANNOT INIT MAIN TASK > MAIN <\n");
exit(1);
}
if (!(dspsem = rt_sem_init(nam2num("DSPSEM"), 0))) {
printf("CANNOT INIT SEMAPHORE > DSPSEM <\n");
exit(1);
}
tasklet = rt_init_tasklet();
mlockall(MCL_CURRENT | MCL_FUTURE);
rt_insert_tasklet(tasklet, 0, timer_handler, 111, nam2num("TSKLET"), 1);
rt_request_irq_task(TIMER_IRQ, tasklet, RT_IRQ_TASKLET, 1);
rtc_start(TIMER_FRQ);
rtc_enable_irq(TIMER_IRQ, TIMER_FRQ);
while (intcnt < maxcnt) {
rt_sem_wait(dspsem);
printf("OVERRUNS %d, INTERRUPT COUNT %d\n", ovr, intcnt);
}
rtc_stop();
rt_release_irq_task(TIMER_IRQ);
printf("TEST ENDS\n");
rt_remove_tasklet(tasklet);
rt_delete_tasklet(tasklet);
rt_sem_delete(dspsem);
rt_task_delete(maint);
return 0;
}
