RE: Two timers on RTC1

Florin — Tue, 01 Oct 2013 12:42:43 GMT

Ah yes, thanks, it works now!

RE: Two timers on RTC1

Sébastien Despont — Tue, 01 Oct 2013 05:37:46 GMT

Hello,

Because you need to re-set the comparators (or reset the tick event, but it is not what you want in your case) to be notified when the counter will reach the comparators values.

To do that, you need to re-set the CC comparator in your interrupt like this for example:

void RTC1_IRQHandler()
{
  if (NRF_RTC1->EVENTS_COMPARE[0] != 0)
  {
    NRF_RTC1->EVENTS_COMPARE[0] = 0;
    NRF_RTC1->CC[0] += 9 * 1000;
  }
  if (NRF_RTC1->EVENTS_COMPARE[1] != 0)
  {
    NRF_RTC1->EVENTS_COMPARE[1] = 0;
    NRF_RTC1->CC[1] += 2 * 1000;
  }
}

If you don't do that, you need to wait the next time that the counter will reach the value of your comparator : reach the overflow value (24 bits counter = 0xFFFFFF/32768 = 511 seconds with prescaler = 0) and restart to count from 0.