shumaguan.txt

数码管动态显示程序

6位8段数码管动态驱动电路原理图及Keil C51驱动程序 
  
  
 
/* 6位数码管演示程序:  显示数码从0---99循环,按 P3.2 按键,显示从"0" 开始*/

＃i nclude <reg52.h>    

int count1s;     
unsigned int count1m; 
unsigned char  dis_bitcount=0; 
unsigned char  display_o[6];   
unsigned char  display_q[6];   

unsigned char code  SEG[11]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff}; 
unsigned char dis_bitdriver=0;


void delay5ms()
{
 register int i;
 for (i=0;i<500;i++)
 ;
}

main()
{
 unsigned char dcode;
 unsigned char p2code,p3code;
 count1m=0; 
 count1s=0; 
 while(1)
 {

  switch(dis_bitcount+1) 
 {
  case 1:dis_bitdriver=0x01;  break;/*display 1*/
  case 2:dis_bitdriver=0x02;  break;/*display 2*/
  case 3:dis_bitdriver=0x04;  break;/*display 3*/
  case 4:dis_bitdriver=0x08;  break;/*display 4*/
  case 5:dis_bitdriver=0x10;  break;/*display 5*/
  default:dis_bitdriver=0x20; break;/*display 6 */
  
 }
 p2code=P2;
 P2=p2code&0x40;
 dcode=SEG[display_q[dis_bitcount]];
 P0=SEG[display_q[dis_bitcount]];  
 P2=(p2code&0x40)|dis_bitdriver;
 if(dis_bitcount>=5) dis_bitcount=0;
 else dis_bitcount++;
 
 
 count1s++;
 if(count1s>=400)   
 {
  count1m++;
  count1s=0;
 } 
 p3code=P3&0x04;
 
 if(count1m>99) count1m=0;
 if(p3code==0) count1m=0;

 display_o[1]=count1m/10;
 display_o[0]=count1m-display_o[1]*10;
 display_q[1]=display_o[1];  
 display_q[0]=display_o[0]; 
 
 delay5ms();
 

 }
 
}
6位LED显示接口说明：
 
 P0.0---P0.7  通过7406 驱动LED的8个段；
 P2.0---P2.5  通过UN2003驱动6个LED 的公共端