stm32中准确延时用的文件,因为时钟速度过快且应用广，要实现ms的延迟是很困难的，所以用嘀嗒时钟。-make sure the delay time is just the time we wanted.

创建了一个能够获得并且修改计算机系统时间的应用程序。程序能够实现系统时间的显示和日历查看，还可以完成系统时间的重新设定。-Created a computer system access and modify the time of application. Programs to achieve system time display and calendar view, you can also reset the time to