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