LCD多级菜单的设计，代码简单，功能强大，是初学者的最好帮手。-LCD multi-level menu design, the code is simple, powerful, and is the best helper for beginners.

基于STM32f1的芯片，通过开发板上的按键和LCD显示屏，实现简单的多级菜单功能，可上翻、下翻、返回和确定。-STM32f1 based chips, through the development of key board and LCD screen, simple multi-level menu functions, on the turn, the next turn, return and OK.