Error received when flashing custom Nordic application to DVK-BL65x: SVCALL(SD_SOFTDEVICE_ENABLE, uint32_t, sd_softdevice_enable(nrf_clock_lf_cfg_t const * p_clock_lf_cfg, nrf_fault_handler_t fault_handler)); Programming custom Nordic App to DVK-BL65x

This error indicates and issue with the clock source referenced in your code. We recommend referencing the appropriate Application Note for Using the DVK-BL65x and Nordic SDK linked below:

• Application Note - Using the DVK-BL652 and Nordic SDK
• Application Note - Using the DVK-BL653 and Nordic SDK
• Application Note - Using the DVK-BL654 and Nordic SDK

As noted in the Application Note, by default the DVK-BL65x uses the on-chip RC oscillator as its clock source, as opposed to Nordic's development kit or dongle which use an external crystal. The difference in oscillator source should therefore be reflected in the SDK as shown Application Note. Alternatively, you can connect an external crystal as per BL65x DVK User Guide

• User Guide - BL652 Development Kit
• User Guide - BL653 Development Kit
• User Guide - BL654 DVK
• User Guide - BL654PA DVK