Migration to SD functions

[Ck]

I have to update my non soft device source code to SD because now I will use Radio.

My question is if it is necessary to rewrite all functions which are in SD API. Like:

NVIC_SetPriority(ADC_IRQn, APP_IRQ_PRIORITY_LOW);
NVIC_ClearPendingIRQ(ADC_IRQn);
NVIC_EnableIRQ(ADC_IRQn);
NRF_POWER->SYSTEMOFF = 1;	
NRF_CLOCK->TASKS_HFCLKSTART = 1;
NRF_RTC1->EVENTS_COMPARE[0] = 0;
__WFI();
__WFE();
and similiar

I'm assume that SD alternate function has just some assert to control if I'm passing right arguments or so. So if I'm sure I didn't use any resources against SD, is it necessary to use strictly only SD functions?

[Nikita]

You can see in S110_SoftDevice_Specification_v1 3.pdf there is a list of peripherals used by softdevice in "Table 23 Peripheral protection and usage by SoftDevice".

Any direct access to the protected resources while softdevice is enabled will generate hard fault by softdevice, so you must use softdevice calls to access to this resources.

[Nikita]

Yes, for example, you want to send some data through UART and you send first byte by writing

NRF_UART0->TXD = data[0]; 

and then go to low-power mode with sd_app_evt_wait() then you will return from sd_app_evt_wait() when UART will send data and generate TXDRDY event so you can handle it like this:

// Enter main loop.
for (;;)
{
    if (NRF_UART0->EVENTS_TXDRDY == 1)
    {
        NRF_UART0->EVENTS_TXDRDY = 0;
        NRF_UART0->TXD = data[next_byte]; 
        ...
    }
    sd_app_evt_wait();
}