Re: #nrf52840 #defines #nrf52840 #defines

Ryan Erickson
 

Hello Matthias,

By default the BL654 DVK does not connect the external 32 kHz clock.  In zephyr, the NRF52840 board files are setup to use the external 32 kHz clock.
You have 2 options:
  1. Follow the instructions in teh BL654 DVK user guide to connect the external 32 kHz clock
  2. Create a custom board file (which you should do anyway) and enable the internal 32 kHz RC oscillator 
CONFIG_CLOCK_CONTROL_NRF5_K32SRC_RC=y
# CONFIG_CLOCK_CONTROL_NRF5_K32SRC_XTAL is not set
CONFIG_CLOCK_CONTROL_NRF5_K32SRC_500PPM=y

Regards,

Ryan

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