low frequency

[venkat242]

Hello forum ,

Help me to enable low frequency clk in nrf52840 

[SwRa]

Hi Venkat,

To enable the low-frequency clock (LFCLK) in the nRF52840, you have two main options: using an external 32.768 kHz crystal oscillator (connected to P0.00 and P0.01, which is used by default) or using the internal RC oscillator. I suppose you want to use the internal RC oscillator.. For this you need to add the Kconfig CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y to prj.conf.

Best Regards,

Swathy

[venkat242]

for my project i assign as CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=y  in proj.conf is used ...Thank for ur suggestion ...i need to enable external clock pls help me ...

[SwRa]

Hi Venkat,

That is the right configuration to use the external clock. Try also adding CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=n, Here is a thread that you can refer: (+) Enable the External Clock on NRF52840 / Weird clock behavior - Nordic Q&A - Nordic DevZone - Nordic DevZone

Best Regards,

Swathy