八路电压表C程序 P0口读入AD值，P2口作AD控制，用共阳LED数码管 P1口输出段码，P3口扫描，最高位指示通道（0-7）-Eight-way voltage meter C procedures P0 I read into the AD value, P2 I make AD control, with a total of P1-yang LED digital tube output above code, P3 port scan, the maximum bit inst