基于SKD2812开发板，编写的开关控制数码管程序！数码管由0到F逐个显示，设定的间隔为一秒，但改变delay的值没有影响。-SKD2812 based development board, the preparation of the digital switch control program! LED display one by one from 0 to F, set the interval of one second, but changing the delay did not