nRF52 Constantly Waking From WFE()

RE: nRF52 Constantly Waking From WFE()

run_ar — Wed, 20 Dec 2017 14:10:54 GMT

If this is the only thing you do in main (while(true) __WFE();__SEV();__WFE();)as you show in your other case, it is highly likely that this is a hw problem.

RE: nRF52 Constantly Waking From WFE()

phipi — Thu, 14 Dec 2017 20:39:27 GMT

This is with a custom design. I'm starting to think it's a hardware issue because I'm seeing the high current even with a basic firmware that only does the WFE(), SEV() instructions and nothing else.

I've started a new question for that but I'd still be curious if there is a way to determine what the source of the wake interrupt was.

RE: nRF52 Constantly Waking From WFE()

WestCoastDaz — Thu, 14 Dec 2017 20:30:32 GMT

Is this the DK or a custom design?

RE: nRF52 Constantly Waking From WFE()

run_ar — Thu, 14 Dec 2017 20:25:33 GMT

The debugger should draw around 1.2 mA (if i remember correctly). What HW peripherals are you using?

RE: nRF52 Constantly Waking From WFE()

phipi — Thu, 14 Dec 2017 16:44:45 GMT

Thanks, that makes sense. However, I'm seeing 5mA of current on reset with no debugger connected. What's the proper way to debug this issue then?

RE: nRF52 Constantly Waking From WFE()

WestCoastDaz — Wed, 13 Dec 2017 22:34:22 GMT

Spizzak,

The CPU can't truely enter sleep when debuggin since the debug hardware is sill active. It's best to remove the debugger from your target for quiescent current measurements.