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I wrote a tutorial for STM32C5 without HAL
and the new Cube MX2. Neither is backward compatible. Arduino does not yet support the STM32C5. If someone is searching for instructions *not* using Cube HAL, then my private (non commercial) homepage might help: https://stefanfrings.de/stm32/stm32c5.html Klick on the "translate"
The STM32C5 is now supported by Arduino. See https://github.com/stm32duino/Arduino_Core_STM32#generic-stm32c5-boards