In nRF52832, how to use the internal RC Oscillator

RE: In nRF52832, how to use the internal RC Oscillator

Susheel Nuguru — Mon, 06 May 2019 11:57:20 GMT

thanks for the update Andrew.

RE: In nRF52832, how to use the internal RC Oscillator

awneil — Mon, 06 May 2019 11:28:39 GMT

Update for SDK 15.3.0:

devzone.nordicsemi.com/.../185362

RE: In nRF52832, how to use the internal RC Oscillator

UBAN — Wed, 20 Apr 2016 09:29:06 GMT

Hi, Aryan. Thanks for the detailed explanation. I understand that XTAL LFCLK is not required at the time of advertising.I try to tell the softdevice to use internal RC.

RE: In nRF52832, how to use the internal RC Oscillator

Susheel Nuguru — Wed, 20 Apr 2016 08:32:45 GMT

Hi, No the XTAL LFCLK is not needed to advertise, your app just need to tell the softdevice to use internal RC and when to calibrate it (temperature change). The softdevice will then use HFCLK XTAL as reference and start it when it needs to calibrate the RC LFCLK.

RE: In nRF52832, how to use the internal RC Oscillator

UBAN — Wed, 20 Apr 2016 08:08:05 GMT

I'm sorry at the lack of explanation. When advertising, oscillator of 32kHz is necessary isn’t it? It does not have mounted on the board that I have used. So, I tried to use the internal RC Oscillator.

RE: In nRF52832, how to use the internal RC Oscillator

Susheel Nuguru — Wed, 20 Apr 2016 07:20:17 GMT

Hi uba, I am not sure if I understand your question correctly. If you are using softdevice then the clock will be enabled when you enable the softdevice.

sd_softdevice_enable

The first argument it takes is the clock configuration that you need for LFCLK. When using softdevice it is not advised to manipulate the LFCLK directly from app.

RE: In nRF52832, how to use the internal RC Oscillator

UBAN — Wed, 20 Apr 2016 01:18:17 GMT

Thank you for quick reply. It was added to write the above to Main.c, not advertising. Do I have that should be set to the other ?

RE: In nRF52832, how to use the internal RC Oscillator

Susheel Nuguru — Tue, 19 Apr 2016 09:04:33 GMT

Hi,

After selecting the clock source, you have to start it.

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.
}