RE: Not able to flash NINA-B306

Jay Tyzzer — Mon, 25 Sep 2023 21:20:01 GMT

Hi Javier,

The Ublox module you are using does not include the external 32KHz crystal for the low-speed clock. This is needed for the Softdevice (Bluetooth stack) to operate.

Most of our examples are setup to use this external crystal which is included on our Dev Kits. However there is a 32KHz internal RC oscillator that can be used for this function. If you put the following into the prj.conf file your application should run. Put this at the end of the prj.conf file.

# Enable the internal 32KHz RC oscillator

CONFIG_BT=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n

CONFIG_SYSTEM_CLOCK_NO_WAIT=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y

Best regards,

Jay Tyzzer