说明：  名称：LCD1602字符液晶滚动演示程序 说明：K1~K3按钮分别实现液晶垂直或水平滚动显示及暂停与继续控制。
(Name: LCD1602 character LCD rolling demo program Description: K1 to K3 button to achieve the LCD vertical or horizontal scrolling display and pause and resume control.)