I2C_DS1307
DS1307 Calendar on I2C bus STM32 Despite STM32F1 series has its own RTC, DS1307 it is just a calendar chip, so it is easy to use, though it has not any protection mechanism.
A project that displays how to communicate an easiest Calendar chip on I2C bus.
CGPL-3.0
DS1307 Calendar on I2C bus STM32 Despite STM32F1 series has its own RTC, DS1307 it is just a calendar chip, so it is easy to use, though it has not any protection mechanism.