A-key--recognition-technology.rar_一键多功能

#include <AT89X51.H> unsigned char ID; void delay10ms(void) { unsigned char i,j; for(i=20;i>0;i--) for(j=248;j>0;j--); } void delay02s(void) { unsigned char i; for(i=20;i>0;i--) {delay10ms(); } } void main(void) { while(1) { if(P3_7==0) {delay10ms(); if(P3_7==0) { ID++; if(ID==4) { ID=0; } while(P3_7==0); } } switch(ID) { case 0: P1_0=~P1_0; delay02s(); break; case 1: P1_1=~P1_1; delay02s(); break; case 2: P1_2=~P1_2; delay02s(); break; case 3: P1_3=~P1_3; delay02s(); break; } } }