Scroll lottery system

　

From that analysis of the circuit diagram, the need to use digital display system (port P0) and buttons (P1 port)

 

 Analysis system may require

(1) using a digital scroll numbers 1-9

(2) using the control button 1

(3) When the button is pressed to stop scrolling digital numbers, the digital display is a digital to digital lottery.

The preparation of these codes in FIG.

 

 

. 1 #include <reg52.h>
 2  #define LED_ALL P0 
 . 3 the sbit Pl ^ KEY = 0 ;                                                                                                                                                                  
 . 4  void LED_XUNHUAN (unsigned char led_i)            // custom function a cyclic array 
. 5  {    
 . 6          Switch (led_i)
 . 7          {
 . 8              Case  0 : LED_ALL = 0x6F ; BREAK ;        // number. 9 
. 9              Case  . 1: LED_ALL = 0x7F ; BREAK ;        // number. 8 
10              Case  2 : LED_ALL = 0x07 ; BREAK ;        // number. 7 
. 11              Case  . 3 : LED_ALL = 0x7D ; BREAK ;        // number. 6 
12 is              Case  . 4 : LED_ALL = 0x6d ; BREAK ;        / / number. 5 
13 is              Case  . 5 : LED_ALL = 0x66 ; BREAK ;        // number. 4 
14              Case  . 6:LED_ALL = 0x4f;break;       //数字3
15             case 7:LED_ALL = 0x5b;break;       //数字2
16             case 8:LED_ALL = 0x06;break;       //数字1
17         }                                    
18 }
19 
20 void main(void)
21 {
22     unsigned char i;
23     while(1)
24      {
 25              for (I = 0 ; I < . 9 ; I ++ )                   
 26 is              {    
 27                  IF (KEY == 0 )                     // determines whether the button is pressed if the cycle stops 
28                      BREAK ;
 29                  the else                             // else continue to loop 
30                      LED_XUNHUAN ( I);
 31 is              }    
 32      } 
 33 is }

 

 

 

 Press the button when the number on the digital display 1 will stop the change, continue to change when the digital release