10个LED全部点亮，稍后全部熄灭，此过程中用于检测LED是否有损坏 8位数码管全部显示“8.”，稍后全部熄灭，然后显示“0 ~ 7”，用于测试数码管有无缺段。-All 10 LED lights, all out later, this process is used to detect LED is damaged 8 digital tube show all "8", later all off, and then display 0 to 7 for testing digit