NRF_ERROR_SDM_LFCLK_SOURCE_UNKNOWN when correctly configured

RE: NRF_ERROR_SDM_LFCLK_SOURCE_UNKNOWN when correctly configured

melvinvdb — Tue, 05 Jun 2018 09:38:47 GMT

Found the solution. A feature in MBed 5 is still open containing the fix in bootloader_util_reset: https://github.com/ARMmbed/mbed-os/compare/feature-nrf5_dfu_s13x_v2#diff-ee447addc83ee85081e3486deb294f75

RE: NRF_ERROR_SDM_LFCLK_SOURCE_UNKNOWN when correctly configured

melvinvdb — Mon, 04 Jun 2018 11:43:10 GMT

The main of the bootloader code already calls SOFTDEVICE_HANDLER_APPSH_INIT which calls SOFTDEVICE_HANDLER_INIT. The sd_softdevice_enable inside the method SOFTDEVICE_HANDLER_INIT is returning the error. So unfortunately that doesn't help.

EDIT: Also MBed 5 calls SOFTDEVICE_HANDLER_INIT inside the method btle_init.

RE: NRF_ERROR_SDM_LFCLK_SOURCE_UNKNOWN when correctly configured

FormerMember — Mon, 04 Jun 2018 11:20:37 GMT

I suspect that when re-entering the bootloader, the bootloader doesn't know the clock source. Try to add SOFTDEVICE_HANDLER_INIT() with the choice of clock source and check if that works better.

The setting for the RC oscillator looks correct.