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 stm32 hal rtc stm32f4 cubemx stm32f4-discovery oled-display-ssd1306 stm32-hal stm32f407vg stm32f4-disc1 stm32-rtc
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Updated
Apr 25, 2019 - C