display.c

拉幕式数码显示技术

#include <AT89X51.H> 
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f, 
                               0x66,0x6d,0x7d,0x07, 
                               0x7f,0x6f,0x00}; 
unsigned char dispbitcode[]={0xf8,0xf9,0xfa,0xfb, 
                             0xfc,0xfd,0xfe,0xff};   
unsigned char dispbuf[8]={10,10,10,10,10,10,10,10}; 
unsigned char dispbitcnt; 
unsigned int t4mscnt;       
unsigned char tmscnt;    
unsigned char u; 
unsigned char i; 
  
void main(void) 
{ 
  TMOD=0x02; 
  TH0=0x06; 
  TL0=0x06; 
  TR0=1; 
  ET0=1; 
  EA=1; 
  while(1); 
} 
  
void t0(void) interrupt 1 using 0 
{ 
  tmscnt++; 
  if(tmscnt==4) 
    { 
      tmscnt=0; 
	  P1=0xff;    
      P0=dispcode[dispbuf[dispbitcnt]]; 
      P1=dispbitcode[dispbitcnt]; 
      dispbitcnt++; 
      if(dispbitcnt==8) 
        { 
          dispbitcnt=0; 
        } 
    } 
  t4mscnt++; 
  if(t4mscnt==1600) 
    { 
      t4mscnt=0; 
      	u++; 
      if(u==9) 
        { 
          u=0; 
        } 
      for(i=0;i<8;i++) 
        { 
          dispbuf[i]=10;   
        } 
      for(i=0;i<u;i++) 
        { 
          dispbuf[i]=i+1;   
        } 
    } 
}