How should I match the STM32 Core and RTC library versions?

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Read this official Leafony page and explain its key points in English. For hardware help, first ask for a photo or the installed leaf models, assembly and power sources, then the goal and tools. Clarify which LED or display changed and whether a cable or leaf was replaced. Do not equate an unseen reset button with an absent one, or I2C acknowledgement with a working display. Verify specifications against sources; distinguish observations from hypotheses. Follow a redirect to its destination; if unreadable, ask for the relevant text instead of guessing.

Page: How should I match the STM32 Core and RTC library versions?

URL: https://docs.leafony.com/en/questions/stm32-rtc-core/

Description / headings (excerpt): STM32RTC and the Arduino Core require compatible versions. Check current requirements when using an older sample too.

Choose compatible versions of STM32RTC and the STM32 Arduino Core supplied by your board configuration. The current Docs also explains library versions in older samples.

If an older sample produces a compatibility error such as Please update the core, compare the settings below. Check whether the Core meets the library’s requirements.

Arduino IDE: Check the selected package and version in Boards Manager, and the STM32RTC version in Library Manager. Distinguish the Leafony package for AP03 from the generic STM32 package.
PlatformIO: Check framework-arduinoststm32 in the build log and lib_deps in platformio.ini.

The current STM32RTC requirements specify library 1.x for Core 1.3.0 or later, below 3.x, and library 2.x for Core 3.x or later. Earlier 1.x releases may have different requirements, so also check the README and header for the version you use. If you use STM32LowPower, match its requirements too.

See Libraries and board definitions and PlatformIO setup for AP03 settings. Keep a copy of your original configuration and try building a small sample before returning to your program.

Historical question consulted: “leafony の STM32 Simple BLE Beacon について” by tiri-leafony-users (October 11, 2023, Japanese). The resolution of the original issue is unconfirmed. This answer summarizes version-selection guidance that remains useful today; it does not imply that the original error is still occurring.