Clock

RE: Clock

Susheel Nuguru — Mon, 21 Aug 2023 13:31:02 GMT

If you are not using any nrfx initialization and if your application is triggered TASKS_HFCLKSTART any source in NRF_CLOCK register then it is the hardware default that is the clock source which is internal oscillator HFINT.

RE: Clock

Mark_Y — Sat, 19 Aug 2023 02:05:54 GMT

Do I define NRFX_CLOCK_ENABLED as 0? The system will select an external high-speed clock as the rtc clock source? Thanks!

RE: Clock

Susheel Nuguru — Fri, 18 Aug 2023 12:10:34 GMT

Hi,

Since you asking about nrf_drv_xxx, I am guessing that you are using our deprecated nRF5SDK (and not our recommended nRF Connect SDK).

[quote user=""]I only need to use these two functions, nrf_drv_clock_lfclk_request() and nrf_drv_clock_hfclk_request(), for initialization.[/quote]

If this is a hardware question, You should know if you have external clocks in your hardware connected and accessible to nRF chip.
If this is a software question and if you are asking how you configure which clock to use in the application, then you should look into the sdk_config.h file in your project and look for the below configs

NRF_CLOCK_ENABLED
CLOCK_CONFIG_LF_SRC

#define NRFX_CLOCK_ENABLED 0
NRFX_CLOCK_CONFIG_LF_SRC