This tutorial is mainly for the STM32F04x series of microcontrollers. For the clock of the STM32 microcontroller, people who have used STM32 must be more clear. STM32 is a microprocessor based on the
Adafruit's CircuitPython has supported SAMD21/D51 microcontrollers for a long time, and now micropython finally supports SAMD series microcontrollers.https://github.com/micropython/micropython/commit/