Does softdevice automatically chose internal low frequency oscillator?

[Minh]

Hi everybody.

I am makeing a custom circuit for nrf51822 CEAA. This circuit supports ANCS and DFU (nrf sdk 9.0.0). I use only external high frequency (16MHz) oscillator in this circuitI used the default code of bootloader (with change to nrf51822 CEAA chip). Unfortunately, when I program firmware to the chip, I did not change the low frequency to the internal low frequency (32KHz) oscillator for softdevice.

Does the softdevice automatically choose internal low frequency if the circuit do not have external low frequency crystal oscillator ?

Thank you very much.

[RK]

No it doesn't. That's why there's the parameter you pass to the softdevice initialisation function telling it what LF clock source to use and dozens and dozens of posts on the dev forums telling people they have to choose a different LF source if they don't have a crystal on the board.

[Minh]

Many thanks