clock source used by gpio example or thread example ?

[shruti mishra]

I am working on project which is based on nrf9160 Development board.

Where the clock is initialized in example code of thread or GPIO ? Which clock source is used by nrf9160 development board. I couldn't able to find in user guide. How we change the clock source? 

[Håkon Alseth]

Hi,

 

If the HFCLKSTAT register reads 0, its sourced by the HFINT (64M RC oscillator), as described here:

https://infocenter.nordicsemi.com/topic/ps_nrf9160/pmu_oscillators.html?cp=2_0_0_4_0_3_0#hfclk

 

The default behavior is to run on 64 MHz RC oscillator, so the firmware must start the HFXO manually if needed.

You can start and stop the HFXO using these tasks:

https://infocenter.nordicsemi.com/topic/ps_nrf9160/clock.html?cp=2_0_0_4_2_1_0_0#register.TASKS_HFCLKSTART

https://infocenter.nordicsemi.com/topic/ps_nrf9160/clock.html?cp=2_0_0_4_2_1_0_1#register.TASKS_HFCLKSTOP

 

Kind regards,

Håkon