How do we know which interrupt resulted in wakeup?

[AK8]

I want my system to sleep for some time, but its waking up and I am unable to understand which interrupt occurred. I want to know which interrupt caused the system to wake up. can u tell me a way to do so?

[Vidar Berg]

Hello,

You may try to do something like shown in the snippet below if it's just for debugging.

static void idle_state_handle(void)
{
    ret_code_t err_code;
    static int pending_irq = -1;

    err_code = nrf_ble_lesc_request_handler();
    APP_ERROR_CHECK(err_code);

    if (NRF_LOG_PROCESS() == false)
    {
        
        CRITICAL_REGION_ENTER();
        nrf_pwr_mgmt_run();
        /* Check which interrupt is pending. Will not work properly if there are more than one pending */
        for (uint32_t i = POWER_CLOCK_IRQn; i <= FPU_IRQn; i++)
        {
            if (NVIC_GetPendingIRQ(i))
            {
                pending_irq = i; // Look up irq number in nrf52.h to find the IRQ source.
            }
        }
        CRITICAL_REGION_EXIT();

        if (pending_irq != -1)
        { 
            NRF_LOG_INFO ("Pending IRQ number: %d", pending_irq);
            pending_irq = -1;
        }

        
    }
}