下面是 74ls164 驱动 共阳数码管的演示程序,电路请看附件

＃i nclude<reg51.h>
#define uint unsigned int
#define uchar unsigned char
sbit DAT=P1^1; //模拟串口数据发送端
sbit CLK=P1^2;//模拟时钟控制端
uchar code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff};//0-9,-,全灭 (共阳字段表)

void sendbyte(uchar byte)
{    
        uchar num,c; 
        num=tab[byte];
  for(c=0;c<8;c++)
        {
    CLK=0;
  DAT=num&0x80; //(0x80即十进制的128, 二进制的10000000 按位发送)
  CLK=1;
        num<<=1;
        
        
        }

}
void delay_50ms(unsigned int t) //50MS演示程序
{
unsigned int j;  
for(;t>0;t--) 
  for(j=6245;j>0;j--) 
{;}
}

main()
{

unsigned char h;
  while(1){
  for(h=0;h<10;h++){
      delay_50ms(1);
      sendbyte(h);
  delay_50ms(10);
  }
  h=0;
    }
}

下面这段是74ls164 驱动共阴数码管的程序源码

＃i nclude<reg51.h>
#define uint unsigned int
#define uchar unsigned char
sbit DAT=P1^1;
sbit CLK=P1^2;
uchar code tab[]={0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xff,0xf6};//0-9,-,全灭

void sendbyte(uchar byte)
{    
        uchar num,c; 
        num=tab[byte];
  for(c=0;c<8;c++)
        {
    CLK=0;
  DAT=num&0x01;
  CLK=1;
        num>>=1;
        
        
        }

}
void delay_50ms(unsigned int t)
{
unsigned int j;  
for(;t>0;t--) 
  for(j=6245;j>0;j--) 
{;}
}

main()
{
unsigned char h;
  while(1){
  for(h=0;h<10;h++){
      delay_50ms(1);
      sendbyte(h);
  delay_50ms(10);
  }
  h=0;
    }
    
}