That is not possible with the implementation of systick on the nRF52-series devices, as systick is sourced by the same clock as the CPU, which is turned off when going to WFE/WFI (sd_app_evt_wait()). I would recommend using the RTCx peripheral (via app_timer for instance) to do this.
That is not possible with the implementation of systick on the nRF52-series devices, as systick is sourced by the same clock as the CPU, which is turned off when going to WFE/WFI (sd_app_evt_wait()). I would recommend using the RTCx peripheral (via app_timer for instance) to do this.
