RE: LF SoftDevice Configuration on nRF52840 Custom Board

Jared — Thu, 09 Jul 2020 13:47:41 GMT

Hi,

The config file is correct. There shouldn't be a need for starting the LF clock manually as the Softdevice should do it auto if you use it. Does it work now?

regards

Jared

RE: LF SoftDevice Configuration on nRF52840 Custom Board

mstanisz — Wed, 08 Jul 2020 04:36:04 GMT

Alright so I dug through more posts until I found one referencing clock_initialization(). I found one of the radio examples and added this code to my project and called it in main():

/**@brief Function for initialization oscillators.
 */
void clock_initialization()
{
    /* Start 16 MHz crystal oscillator */
    NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_HFCLKSTART    = 1;

    /* Wait for the external oscillator to start up */
    while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0)
    {
        // Do nothing.
    }

    /* Start low frequency crystal oscillator for app_timer(used by bsp)*/
    NRF_CLOCK->LFCLKSRC            = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
    NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_LFCLKSTART    = 1;

    while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
    {
        // Do nothing.
    }
}

Now it works! I tried removing the code block and it seems to still work, so I'm a bit confused what I triggered. Should I need this code snippet?

Matt