c.rar_site:www.pudn.com

#include <reg52.h> #define uchar unsigned char #define uint unsigned int sbit K1 = P1^0; sbit RELAY = P2^4; void DelayMS(uint ms) { uchar t; while(ms--) { for(t=0;t<120;t++); } } void main() { P1 = 0xff; RELAY = 1; while(1) { if(K1==0) { while(K1==0); RELAY = ~RELAY; DelayMS(20); } } }