How to detect the external low-frequency vibration crystal work?When it doesn't work how to switch frequency crystals?

[juge90]

52832，SDK12.0.0

I met such a situation: In the use of JLink burning program or air upgrade, after the completion of the program card died in initialization low-frequency crystals.

"sd_softdevice_enable(p_clock_lf_cfg, softdevice_fault_handler);"

[juge90]

After the exception occurs, I've tried NRF_CLOCK->TASKS_LFCLKSTOP = 1, But there is no effect. I've tested external low-frequency crystals did not work at this moment.

[bjorn-spockeli]

No effect, as in the LFCLKSTAT reads 0x00010000 after you've triggered the TASKS_LFCLKSTOP task? If the LFCLKSRC is set to Xtal, and you trigger the TASKS_LFCLKSTART do you get the EVENTS_LFCLKSTARTED event?