POF configuration when using soft device

Question

Hi, 
 I'm using nrf52840, 
 I'm using SDK 15. 
 I can see that in nrf_drv_power_pof_init function only few power setting are allowed - is that true? can I only use those values which are in this function? 
 Also, is there any clear example dealing with POF? 
 
 Thanks, 
 Lior.

Susheel Nuguru · Answer

It looks like the underlying softdevice call sd_power_pof_threshold_set supports all the below thresholds as mentioned in nrf_soc.h file 
 /**@brief Power failure thresholds */
enum NRF_POWER_THRESHOLDS
{
 NRF_POWER_THRESHOLD_V17 = 4UL, /**< 1.7 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V18, /**< 1.8 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V19, /**< 1.9 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V20, /**< 2.0 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V21, /**< 2.1 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V22, /**< 2.2 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V23, /**< 2.3 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V24, /**< 2.4 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V25, /**< 2.5 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V26, /**< 2.6 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V27, /**< 2.7 Volts power failure threshold. */
 NRF_POWER_THRESHOLD_V28 /**< 2.8 Volts power failure threshold. */
};
 
 So this can only mean that nrf_drv_power_pof_init has not implemented the rest of the thresholds. You can add them yourself as the thresholds are already defined in nrf_power.h file. It is just the matter of you extending the switch cases in the function nrf_drv_power_pof_init