EEprom example support flash read/write
Posted: Tue Feb 02, 2021 3:26 pm
stm32duino have the example of eeprom handle; Do this function support read/write the flash of stm32 (my mcu type is stm32F103C8T6) 
Yes. It uses virtual EEPROM in flash. But it's not recommended to use virtual EEPROM if you will often write data to EEPROM.
On STM32F103C8 you will have 256kB.