Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. **Zephyr expects by default an external crystal clock** By default, Zephyr assumes there's an external crystal for 32khz (LFCLK) and, at startup, it waits for that crystal to "settle" before continuing. OpenEarable EXG has by default no such crystal, and the NINA module doesn't contain one either. Its required to set in the project config ''IG_CLOCK_CONTROL_NRF_K32SRC_RC''. In addition, ''CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION'' allows an internal calibration based on the fast high-frequency clock for the radio (BLE), based on heat changes, which might change the internal RC clock, it rechecks against the radio clock. zephyr-learnings.txt Last modified: 2026/06/09 19:34by fabricio