Is MWU in Softdevice?

[Justin]

Hi,

I am using nRF52832 along with Softdevice 6.0.0, SDK 15.0.0, Chip Revision 2 (QFAA-EX0).

I understand that softdevice uses MWU from this document

As per the Errata 75 there is increased current consumption when MWU is used.

We are not using MWU in our application code, so how to apply the workaround for this errata in our code? Will the softdevice take care of this errata internally or the application has to take care of it. In application we do use __WFE.

Regards,

Justin

[Susheel Nuguru]

If you use sd_app_evt_wait to sleep, then the workaround is applied inside this sleep function. But if you use __WFE instead of sd_app_evt_wait, then when you go to sleep then MWU remains enabled by the softdevice and the ERRATA issue exists keeping higher power consumption in the sleep.

Is there any specific reason you do not use sd_app_evt_wait() to go to sleep?

[Justin]

Hi Susheel,

In this ticket you asked us to use __WFE instead of sd_app_evt as a workaround for Errata 220.

Please suggest what needs to be done in this case? 

[Susheel Nuguru]

Sorry for the delayed reply, I think we need to do, I am asking the experts to confirm this.