NRF51 SYSTEM ON - RTC + external interrupt

RE: NRF51 SYSTEM ON - RTC + external interrupt

endnode — Fri, 10 Mar 2017 14:47:14 GMT

Cool;) Can you then mark correct answer and close the question?:)

RE: NRF51 SYSTEM ON - RTC + external interrupt

endnode — Fri, 10 Mar 2017 14:46:44 GMT

Here is more on WFI/WFE difference. From what I see your code should be correct so my guess would be that you don't set interrupts correctly before entering sleep mode and so the peripheral cannot wake you up...

RE: NRF51 SYSTEM ON - RTC + external interrupt

Gavin — Fri, 10 Mar 2017 14:46:00 GMT

My bad. That does indeed work - it was another piece of my code interfering with it. Thanks again

RE: NRF51 SYSTEM ON - RTC + external interrupt

Gavin — Fri, 10 Mar 2017 14:36:56 GMT

Thanks Jan. If I wanted it to wake on either RTC or external interrupt, would I call WFI or WFE? At the moment I am calling WFE (see below) but it does not respond to the external interrupt.

					// Enter System ON sleep mode
				__WFE();  
				// Make sure any pending events are cleared
				__SEV();
				__WFE();

RE: NRF51 SYSTEM ON - RTC + external interrupt

endnode — Fri, 10 Mar 2017 14:26:26 GMT

Hi Gavin,

Sure it has. Both RTCx HW peripheral as well as GPIOTE can wake you by interrupt if your code entered "sleep" by WFI/WFE ARM instructions. You can also be woken up from System OFF by GPIO signal (e.g. button press) but RTC cannot run so this is not available.

Cheers Jan