SoftDevice S113 interrupt priority levels: 0, 1 and 4 or 6?

[andy4]

Does SoftDevice S113 use interrupt priority level 4, or are the actual S113 interrupt priorities 0, 1 and 6?

As I understand it, this says S113 uses priority levels 0, 1 and 4:

https://infocenter.nordicsemi.com/topic/sds_s113/SDS/s1xx/processor_avail_interrupt_latency/exception_mgmt_sd.html

But SD_EVT_IRQHandler seems to use priority 6.

I see priority 6 returned from current_int_priority_get() inside my NRF_SDH_BLE_OBSERVER handler, with NRF_SDH_DISPATCH_MODEL 0. It also says 6 in nrf_soc.h and in 

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.s113.api.v7.0.1%2Fgroup__nrf__soc__api.html

[Drill down through Defines to SD_EVT_IRQHandler]

[Edvin]

andy4 said:

The reference I gave says "The priorities of the interrupts reserved by the SoftDevice cannot be changed."

 

#define SD_EVT_IRQHandler (SWI2_IRQHandler)

SoftDevice Event IRQ handler. Used for both protocol events and SoC events. The default interrupt priority for this handler is set to 6.

You can't change the softdevice priorities, but it may be possible to change the event handler's IRQ priority.

To change the event handler's priority, you can use the following implementation:

static void change_irq_priority(uint32_t IRQn_priority)
{
    ret_code_t err_code;

    err_code = sd_nvic_SetPriority(SD_EVT_IRQn, IRQn_priority);
    APP_ERROR_CHECK(err_code);
    //NRF_LOG_INFO("priority changed with err_code 0x%02x", err_code);
}

Best regards,

Edvin