DCDC

DCDC power mode needs external coil connected to DCC pin. Without coil and DCDC enable strange issues occurs:

• random z_arm_usage_fault in Zephyr based apps.
• app startup stuck in lfclk_spinwait()
• everything works with J-Link connected :)

References:

• Zephyr project on a custom board wont' start up after removing debugge
• nRF52832 application won't start without RTT console
• Interesting Issue with board configuration - application wont start unless "kickstarted" by RTT or debugger.
• It doesn't run without connect j-link viewer