自动升降旗程序.txt

利用AT89S51单片机控制国旗自动升降

#include<at89x51.h>

unsigned char code shuzi[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0};

unsigned char code dianji[]={0xf7,0xf3,0xfb,0xf9,0xfd,0xfc,0xfe,0xf6};

unsigned char ban;

void guoqi(unsigned int a) ;

unsigned int h,dh,mainh;    //定义国旗所在的高度h，给定的高度dh,和总高度mainh

unsigned char key()        //键盘扫描

{

unsigned char a;

P1=0x0f;

a=P1;

a|=0xf0;

P1=a;

a=P1;

P1=0x0f;

return a;               //得到键盘所按下键的键值

}


void ms(unsigned int Delay)    //延时函数

{

unsigned int a;

for(;Delay>0;Delay--)        

for(a=0;a<114;a++)         //1ms循环114次

{;}

}


void dingshi1()       //定时器设置

{

TMOD=1;          //使用定时器0方式1

TH0=0x29;         //给定时器赋初值

TL0=0x02;

TR0=0;            //关定时器

}


void dingshi2()       //定时器赋初值

{

TF0=0;            //定时器溢出中断标志位清零

TH0=0x29;         //定时器重新赋初值

TL0=0x02;

}


void xianshi(unsigned int a)    //数码管显示

{

a=a/4;

TI=0;

SBUF=shuzi[a/100]+128;     //显示百位的数值 

while(!TI);

TI=0;

SBUF=shuzi[a/10%10];       //显示十位的数值

while(!TI);

TI=0;

SBUF=shuzi[a%10];         //显示个位的数值

while(!TI);

TI=0;

}


void display()     

{

unsigned char a;

unsigned int change_h;

while(1)

{

P1=0x0f;

while(P1==0x0f);     //有键按下，退出循环

a=key();

if(a==0xee) {if(P0_1==1){dh=mainh;P0_1=1;guoqi(dh);break;} 

               if(P0_1==0){dh=mainh;guoqi(dh);

                        dh=0;guoqi(dh);

               dh=mainh;P0_1=1;guoqi(dh);break;}

                        }

                        //升旗

if(a==0xed) {dh=0;P0_1=1;break;

               if(P0_1==1){dh=0;P0_1=1;guoqi(dh);break;} 

               if(P0_1==0){dh=mainh;guoqi(dh);

                        dh=0;P0_1=1;guoqi(dh);break;}

                        }//降旗

              

if(a==0xeb) { P0_1=0;ban=1;dh=mainh;guoqi(dh); if(ban){guoqi(h*2/3); ban=0;}

               break;}     //半旗

if(a==0xe7) xianshi(change_h);                 //显示高度

if(a==0xde) if(change_h<=(mainh-40)) {change_h+=40;xianshi(change_h);}    //以每10cm加高度

if(a==0xdd) if(change_h>=40) {change_h-=40;xianshi(change_h);}    //以每10cm减高度


if(a==0xdb) {dh=change_h;P0_1=1;break;}     //开始

ms(300);       //延时300ms

} 

}


void guoqi(unsigned int a)     //升降旗

{

TR0=1;                 //开定时器

if(a==mainh) P0_2=0;

while(1)

{

if(TF0)                //检测定时器溢出标志位

{

   dingshi2();

   if(h==a) break;         

   if(a>h) h++;

   else h--;

   P2=dianji[h%8];

   if(h>10) P0_2=1;

   xianshi(h);

}

P1=0x0f;           //检测停止

if(key()==0xd7) {P0_1=1;break;}     //按停止键

if((P2_5||P2_7)==0) break;

}

TR0=0;

}


void main(void)

{ 

dingshi1();

h=0;

xianshi(0);

mainh=720;        //电机转720拍，共180cm

while(1)

{ 

display();



}

}