2020物联网实验室的考核题目

 

 

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unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};       int time=99;     int t1=0;     int t2=0;     int i=0;   void Timer0Init(void)     //1毫秒 {   EA=1;   ET0=1;   TR0 = 1;        //定时器0开始计时   TMOD = 0x01;    //设置定时器模式   TL0 = 0xCD;     //设置定时初值   TH0 = 0xD4;     //设置定时初值 }   int main() {     led5=0;     Timer0Init();   while(1)   {   t1=time/10;   t2=time%10;    W2=0;    W3=1;    P0=table[t2];    delay(100);    W2=1;    W3=0;    P0=table[t1];    delay(100);   } return 0; }        void time_user()interrupt 1  {   TL0 = 0xCD;     //设置定时初值   TH0 = 0xD4;     //设置定时初值   i++;   if(i==100)   {   led5=~led5;   i=0;   time--;   if(time<0)   {   time=99;   }   }  }

　　

 

 软件延时来实现呼吸灯，一路定时器控制FM

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unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};       int time=99;     int t1=0;     int t2=0;     int i=0;   void Timer0Init(void)     //1毫秒 {   EA=1;   ET0=1;   TR0 = 1;        //定时器0开始计时   TMOD = 0x01;    //设置定时器模式   TL0 = 0xCD;     //设置定时初值   TH0 = 0xD4;     //设置定时初值 }   int main() {     led5=0;     Timer0Init();   while(1)   {   t1=time/10;   t2=time%10;    W2=0;    W3=1;    P0=table[t2];    delay(100);    W2=1;    W3=0;    P0=table[t1];    delay(100);   } return 0; }        void time_user()interrupt 1  {   TL0 = 0xCD;     //设置定时初值   TH0 = 0xD4;     //设置定时初值   i++;   if(i==100)   {   led5=~led5;   i=0;   time--;   if(time<0)   {   time=99;   }   }  }

　　其实这个东西挺坑的，定时器有优先级，所以选择了折中的办法

 

C语言题目

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int main() {     int N = 0;     for (int x = 1; x <= 3; x++)     {         for (int y = 0; y <= 3; y++)         {             for (int z = 0; z <= 3; z++)             {                 if (x == y || x == z || z == y)                 {                     continue;                 }                 printf("%d%d%d\n", x, y, z);                 N++;             }         }     }     printf("共计%d个\n", N);     system("pause");     return 0; }

　第一个不写了，数码管平时也用不到