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Using RTC with LSE at STM32F4Discovery board (stm32f407vg). Output in display oled 0.96" 126x64 (ssd1306) by I2C interface. Timer 6 interrupt used for update lcd screen. On stm32f4discovery board you need to set X3 crystal (32768 Hz) and C16 and C22 (6.8pF). If you havn't X3 crystal you should edit the code and set LSI using in RCC section.
I2C Bare metal drivers for stm32 f4 family of microcontrollers written in C from scratch .The driver contain apis for the user to send and receive data i2c communication . The driver has two flavor of apis polling based (blocking ) and Interrupt based (non blocking ) check examples in the Src folder for more reference .