四个按键控制8LED4状态.zip

#include<reg51.h> sbit p3_0=P3^0; sbit p3_1=P3^1; sbit p3_2=P3^2; sbit p3_3=P3^3; void delay(unsigned char i); void main() { unsigned char ledctr; P3=0xff; while(1) { ledctr=P3; switch(ledctr) { case 0xff:P1=0x00;break; case 0xfe:P1=0xff;break; case 0xfd:P1=0x55;delay(200);P1=0xaa;delay(200);break; case 0xfb:P1=0xf0;break; case 0xf7:P1=0x0f;break; default:; } } } void delay(unsigned char i) { unsigned char j,k; for(k=0;k<i;k++) for(j=0;j<255;j++); }