1 //延时1MS
 2 void delay_1ms()
 3 {
 4   unsigned int i;
 5   for(i=1;i<(unsigned int)(1144-2);i++)
 6     ;
 7 }
 8 //延时nMS
 9 void delay_ms(unsigned int n)
10 {
11   unsigned int i=0;
12   for(i=0;i<n;i++)
13   {
14     delay_1ms();
15   }
16 }
17 //主函数，依次顺序打开LED
18 int main()
19 {
20   unsigned char i;
21   DDRD = 0xFF; //设置D口为输出模式
22   PORTD = 0xFF; //置高电平
23   while(1)
24   {
25     for(i=0;i<8;i++) //顺序打开LED
26     {
27       PORTD = ~(1<<i); //点亮的位置低电平
28       delay_ms(200);
29     }
30   }
31   return 0;
32 }

 1 void main()
 2 {
 3     unsigned char i;
 4     unsigned char num[10] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
 5
 6     DDRD = 0xFF; //设置D口为输出模式
 7     PORTD = 0xFF; //置高电平
 8
 9     while(1)
10     {
11         for(i=0;i<10;i++) //LED数码管顺序显示字型0~9
12         {
13             PORTD = num[i];
14             delay_ms(500);
15         }
16     }
17 }

 1 void main()
 2 {
 3     //PB口做字形码的输出口，PC0~PC3控制数码管的轮流显示
 4     unsigned char i,j;
 5     static unsigned char LedNum[10] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
 6     //显示小数点要加0x80
 7     unsigned char CountNum[4] = {0,0,0,0}; //计数的百、十、个位和十分位
 8     DDRB = 0xFF; //设置B口为输出模式
 9     PORTB = 0xFF; //置高电平
10     DDRC = 0x0F;
11     PORTC = 0xFF;
12
13     while(1)
14     {
15         i=0;  //用于PC0~PC3的轮转
16         for(j=0;j<10;j++) //依次显示4S"000.0"
17         {
18             i = ++i%4;
19             PORTC&=~(1<<i);
20             if(2==i) //如果是第三个数字则加个小数点显示
21                 PORTB = LedNum[0] + 0x80;
22             else //其余情况都没有小数点显示
23                 PORTB = LedNum[0];
24             delay_ms(10);
25             PORTC|= 0xFF;//复位，切换到下一个输出口
26         }
27         CountNum[0] = CountNum[1] = CountNum[2] = CountNum[3] = 0; //用于实现4位数的加一变化
28         while(1)
29         {
30             //计数加1，满9进位、后置0
31             if(CountNum[3]++==9)
32             {
33                 CountNum[3] = 0;
34                 if(9 == CountNum[2]++)
35                 {
36                     CountNum[2] = 0;
37                     if(9 == CountNum[1]++)
38                     {
39                         CountNum[1] = 0;
40                         CountNum[0]++;
41                     }
42                 }
43             }
44             //显示计数值
45             for(i=0;i<4;i++)
46             {
47                 PORTC&=~(1<<i);
48                 if(2 == i)
49                     PORTB = LedNum[CountNum[i]] + 0x80;
50                 else
51                     PORTB = LedNum[CountNum[i]];
52                 delay_ms(10);
53                 PORTC|=0xFF;
54             }
55             //999.9的时候退出
56             if(CountNum[0]==9 && CountNum[1]==9 && CountNum[2]==9 && CountNum[3]==9)
57                 break;
58         }
59     }
60 }