利用STM32的RTC实现一个电子时钟。在超级终端显示UNIX时间戳，公历，农历，北京时间。配合野火开发板，内涵PDF教程以及源代码-The use of RTC STM32 to achieve an electronic clock. In the super terminal display UNIX time stamp, the Gregorian calendar, the lunar new year, Beijing time.