基于51单片机的按键控制流水灯

#include<reg52.h> #include<intrins.h> //包含循环左、右移位函数的头文件（_crol_, _cror_） sbit S1=P1^0; sbit S2=P1^1; sbit S3=P1^2; sbit S4=P1^3; unsigned char keyval; void key_scan(void); //按键扫描，取键值 void forward(void); //从上到下闪烁 void backward(void); //从下到上闪烁 void middleward(void); //从中间到两边，再从两边到中间 void delay10ms(void); //按键扫描延时，防抖动 void led_delay(void); void guanbi(); void main(void) { keyval=0; //键盘初始化为0 while(1) { key_scan(); //调用键盘扫描函数 switch(keyval) { case 1:forward(); //键值为1，从上到下闪烁 break; case 2:backward(); //键值为2，从下到上闪烁 break; case 3:middleward(); //键值为3，从中间到两边，再从两边到中间 break; case 4:guanbi(); //键值为4，关闭 break; } } } void key_scan(void) { P1=0xff; if((P1&0x0f)!=0x0f) //检测到有键按下 { delay10ms(); if(S1==0) keyval=1; if(S2==0) keyval=2; if(S3==0) keyval=3; if(S4==0) keyval=4; } } void forward(void) { P2=0xfe; //1 led_delay(); P2=0xfd; //2 led_delay(); P2=0xfb; //3 led_delay(); P2=0xf7; //4 led_delay(); P2=0xef; //5 led_delay(); P2=0xdf; //6 led_delay(); P2=0xbf; //7 led_delay(); P2=0x7f; //8 led_delay(); } void backward(void) { P2=0x7f; //8 led_delay(); P2=0xbf; //7 led_delay(); P2=0xdf; //6 led_delay(); P2=0xef; //5 led_delay(); P2=0xf7; //4 led_delay(); P2=0xfb; //3 led_delay(); P2=0xfd; //2 led_delay(); P2=0xfe; //1 led_delay(); } void middleward(void) { P2=0xe7; led_delay(); P2=0xdb; led_delay(); P2=0xbd; led_delay(); P2=0x7e; led_delay(); P2=0xbd; led_delay(); P2=0xdb; led_delay(); } void guanbi() { P2=0xff; //8 led_delay(); P2=0xff; //7 led_delay(); P2=0xff; //6 led_delay(); P2=0xff; //5 led_delay(); P2=0xff; //4 led_delay(); P2=0xff; //3 led_delay(); P2=0xff; //2 led_delay(); P2=0xff; //1 led_delay(); } void led_delay(void) { unsigned char i,j; for(i=0;i<220;i++) for(j=0;j<220;j++); } void delay10ms(void) { unsigned char i,j; for(i=0;i<100;i++) for(j=0;j<100;j++); }