what exactly do I need softdevice_sys_evt_handler for?

Question

Hi 
 I am using SDK12 with NRF51822, 
 
 So far I haven’t initialized the sys_evt_handler ( softdevice_sys_evt_handler_set(sys_evt_dispatch) ) And my program works fine, 
 Ive seen a thread mentioning that it is used for NVMC, 
 but I have used sd_flash_write successfully to write to flash, what will I gain from using this handler when writing to flash or in general? 
 
 I would like to get some more understanding about this issue, what exactly are the events this meant to handle, what is its importance? Preferably with some examples. 
 
 Thanks!

Vidar Berg · Accepted Answer

Sorry, I misread your question. The following events may be forwarded to your sys event dispatcher: 
 /**@brief SoC Events. */
enum NRF_SOC_EVTS
{
 NRF_EVT_HFCLKSTARTED, /**< Event indicating that the HFCLK has started. */
 NRF_EVT_POWER_FAILURE_WARNING, /**< Event indicating that a power failure warning has occurred. */
 NRF_EVT_FLASH_OPERATION_SUCCESS, /**< Event indicating that the ongoing flash operation has completed successfully. */
 NRF_EVT_FLASH_OPERATION_ERROR, /**< Event indicating that the ongoing flash operation has timed out with an error. */
 NRF_EVT_RADIO_BLOCKED, /**< Event indicating that a radio timeslot was blocked. */
 NRF_EVT_RADIO_CANCELED, /**< Event indicating that a radio timeslot was canceled by SoftDevice. */
 NRF_EVT_RADIO_SIGNAL_CALLBACK_INVALID_RETURN, /**< Event indicating that a radio timeslot signal callback handler return was invalid. */
 NRF_EVT_RADIO_SESSION_IDLE, /**< Event indicating that a radio timeslot session is idle. */
 NRF_EVT_RADIO_SESSION_CLOSED, /**< Event indicating that a radio timeslot session is closed. */
 NRF_EVT_NUMBER_OF_EVTS
}; 
 where NRF_EVT_RADIO_* may be relevant if you use the Softdevice's multiprotocol support. NRF_EVT_POWER_FAILURE_WARNING if you have called sd_power_pof_enable(), and NRF_EVT_HFCLKSTARTED if you have requested the HF crystal through sd_clock_hfclk_request()

Vidar Berg · Answer

Generally yes. But it is possible to use the radio in allocated "timeslots" through the Softdevice's multiprotocol feature. Multiprotocol support

what exactly do I need softdevice_sys_evt_handler for?

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