Software Interrupt Handler nRF52832

RE: Software Interrupt Handler nRF52832

bjorn-spockeli — Wed, 29 Jan 2020 13:25:07 GMT

[quote user="AimHigh"]Do you have any specific examples available in the SDK 16 or lower?[/quote]

No, there is no dedicated EGU example in the SDKm but there are several threads on it here on DevZone

[quote user="AimHigh"]Does this EGU have got any API's?[/quote]

No, the register interface itself is very straight forward so we have not opted for an Hardware abstraction layar on top.

[quote user="AimHigh"]Is there any restriction on using EGU with softdevice?[/quote]

Yes, see Hardware peripherals under System on Chip resource requirements in the S132 SoftDevice specification.

[quote user="AimHigh"]Is EGU any different from SWI?[/quote]

No, not really. The EGU allows you to trigger a interrupt from software, i.e. a Software Interrupt.

Best regards

Bjørn

RE: Software Interrupt Handler nRF52832

AimHigh — Wed, 29 Jan 2020 12:18:34 GMT

Hi Bjorn,

Thank you for that code snippet.

Do you have any specific examples available in the SDK 16 or lower?

Does this EGU have got any API's?

Is there any restriction on using EGU with softdevice?

Is EGU any different from SWI?

Thank you

Aim High

RE: Software Interrupt Handler nRF52832

bjorn-spockeli — Mon, 27 Jan 2020 11:53:37 GMT

HI Aim High,

the nRF52832 has a EGU — Event generator unit ( i.e. Software interrupt unit) that you can use to trigger SW interrupts, see snippet below.

void SWI3_EGU3_IRQHandler(void)
{   
    // Clear SWI Event. 
    NRF_EGU3->EVENTS_TRIGGERED[0] = 0;
             
    // Place code here

}

static void init_egu()
{  
    // Enable TRIGGERED0 interrupt
    NRF_EGU3->INTENSET = EGU_INTENSET_TRIGGERED0_Enabled << EGU_INTENSET_TRIGGERED0_Pos;
    
    // Set EGU3 Interrupt pririty to 6.
    NVIC_SetPriority(SWI3_EGU3_IRQn,6);
    
    //Enable SWI3_EGU3 interrupt. 
    NVIC_EnableIRQ(SWI3_EGU3_IRQn);
}


int main(void)
{
    bool erase_bonds;
    uint32_t err_code;
    
    // Initialize.
    log_init();
    timers_init();
    buttons_leds_init(&erase_bonds);
    ble_stack_init();
    gap_params_init();
    gatt_init();
    advertising_init();
    services_init();
    conn_params_init();
    egu_init();
    
    // Trigger event
    NRF_EGU3->TASKS_TRIGGER[0] = 1;
    
    // Enter main loop.
    for (;;)
    {
        if (NRF_LOG_PROCESS() == false)
        {
            power_manage();
        }
    }
}

Best regards

Bjørn