nRF52832 / changing clock source dynamically in the FW

[JohnM]

Hello,

We've a Custom board based on nRF52832, it works fine in beacon mode using the Synth Clock (else it doesn't work):

// <o> CLOCK_CONFIG_LF_SRC  - LF Clock Source
// <0=> RC
// <1=> XTAL
// <2=> Synth

#ifndef CLOCK_CONFIG_LF_SRC
#define CLOCK_CONFIG_LF_SRC  2
#endif

But is it possible to change the source dynamically in the FW?  (like using RC oscillator in sleep mode and back to Synth in Active mode)

Thanks,

John.

[ovrebekk]

Hi John

To answer your question, yes, you can change the LF clock source dynamically if you like. That said it shouldn't be necessary, will complicate your firmware and increase the overall current consumption. 

What happens if you try to use the RC source all the time?

Have you made sure to request external HF clock before enabling the radio?

Are you using a SoftDevice for the beaconing, or are you using custom code?

Best regards
Torbjørn