嵌入式c语言51单片机项目sbit key1=P3^0; sbit key2=P3^1; sbit key3=P3^2; sbit duan_1 =P2^0; //虽然声明是duan但是其实是用来位选的 sbit duan_2 =P2^1; sbit duan_3 =P2^2; sbit duan_4 =P2^3; sbit duan_5 =P2^4; sbit duan_6 =P2^5; sbit huxiled=P2^6; //呼吸灯 sbit NzLed=P3^3;