nRF52 Constantly Waking From WFE()

[phipi]

I'm trying to put the nRF52 into sleep by using the following code in a loop:

      __WFE();
      __SEV();
      __WFE(); 

But I see current consumption at around 5mA still, and when I debug I notice it the processor is constantly returning from WFE. How can I tell what's causing this or sd_app_evt_wait() to return?

[WestCoastDaz]

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.

[phipi]

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?

[run_ar]

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

[WestCoastDaz]

Is this the DK or a custom design?

[phipi]

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.