STM32WL55 using XO

[FYASA.1]

Hello to everyone,

There are many examples that come with the STM32WL55. Especially LoraWAN examples are very useful. All examples are made to work with TCXO and are not very obvious to those working with XO in code.

We made a board with the STM32WL55CCU. We used XO instead of TCXO on the board.

What fixes should I do for the XO on the firmware side?

[Tesla DeLorean]

XO vs TCXO, still got a single clock output, how would it be different other than ppm/ppb performance?

External clock sources typically use HSE_BYPASS mode as they don't need to excite a crystal

[TDK]

Using an XO shouldn't be any different than using a TCXO, except that your clock source will be a little less accurate, especially over the full temperature range. It may or may not matter in your application, but no changes are required on the firmware side.