how do I use the Power supply supervisor to determine if the battery is below the POF thershold?

[Glenn]

I have set the POFCON to enable the power failure comparator and set the voltage level to2.5 volts. How do I know when the battery voltage is below the 2.5 volt level? How do I register for the POFWARN event?

[John]

I believe you are supposed to get a POF warning event allowing you to prepare for power failure. If you are using the soft device stack I believe the stack will send you a NRF_EVT_POWER_FAILURE_WARNING if you enable the POF using sd_power_pof_enable.

[Glenn]

Do I need to use the soft device stack to get this event?