先点亮一个LED小灯
#include "reg52.h" sbit led = P2^0; void main(){ while(1){ led = 0; } }
点亮一个LED 带有 延时函数 x是几,就延时几秒
#include <reg52.h> #define uint unsigned int sbit led = P2^0; void sleep(uint); void main(){ led = 0; sleep(1); led = 1; sleep(1); P2 = 0xf0; //11110000 后四个全亮 然后灭 sleep(1); P2 = 0xff; //若采用二进制 11111111 会出错 sleep(1); } void sleep(uint x){ uint i,j; for(i = x * 1000;i>0;i--) for(j = 110;j>0;j--); }
流水灯
#include <reg52.h> #include <intrins.h> //包含_crol_ 函数的头文件 #define uint unsigned int #define uchar unsigned char void sleep(uint); uchar aa; //赋值用 void main(){ aa = 0xfe;//11111110 while(1){ P2 = aa; sleep(500);//延时500ms aa = _crol_(aa,1); //左移 _crol__ 右移 _cror_ } } void sleep(uint x){ uint i,j; for(i = x * 1;i>0;i--) for(j = 110;j>0;j--); }
循环 流水灯 ————> 左移到头然后右移,右移到头继续左移
#include <reg52.h> #include <intrins.h> //包含_crol_ _cror_ 函数的头文件 #define uint unsigned int #define uchar unsigned char void sleep(uint); uchar aa; //赋值用 void main(){ uint i = 0; aa = 0xfe;//11111110 while(1){ if(i < 7){ P2 = aa; sleep(500);//延时500ms aa = _crol_(aa,1); i++; }else{ P2 = aa; sleep(500);//延时500ms aa = _cror_(aa,1); i++; if(i == 14){ i = 0; } } } } void sleep(uint x){ uint i,j; for(i = x * 1;i>0;i--) for(j = 110;j>0;j--); }