4_3_2_1位disp.c

单片机C语言15个实验附有原理图和程序 是我的课程作业 以经过实践验证

//4_3_2_1λdisp
#include <stdio.h>
#include <reg51.h>
#include <intrins.h>
#define hi 0x3c
#define lo 0xb0
unsigned  char code ledk[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6D,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned  char t0_count,disp[4];
unsigned int disp_value,a[4]={1,12,123,1234};
sbit P37=P3^7;sbit clk=P0^7;sbit sda=P0^6;               //74LS164
void delay(unsigned int n)
{ unsigned int i,j;
  for(i=0;i<n;i++)
     for(j=0;j<n;j++)
       ;}
void shift(unsigned char dx)
{static unsigned char d;
   unsigned char j=0;
    d=dx;
   	while(j<8)
	{if((d&0x80)!=0) sda=1;
       else  sda=0;
	   clk=0;clk=1;
	   d<<=1;j++;}  }
void t0() interrupt 1 
 {static unsigned char i;
 TH0=hi;TL0=lo;t0_count++;
   if(t0_count==20){t0_count=0;
                    disp_value=a[i];
	                i++;if(i>3)i=0;	  }   }
void hextodec()
 {unsigned int xx;
  disp[3]=disp_value/1000; xx=disp_value%1000;
  disp[2]=xx/100;          xx=xx%100;
  disp[1]=xx/10;           
  disp[0]=xx%10;   }
void display()
{static unsigned char mask=0x01,i=0;
   if(disp[3]==0)
       {if(disp[2]!=0)disp[3]=16;
	       else if(disp[1]!=0){disp[3]=16;disp[2]=16;}
             else {disp[3]=16;disp[2]=16;disp[1]=16;}  }
	 P2=~mask;shift(ledk[disp[i]]);
	 mask=mask<<1;if(mask==0x10)mask=0x01;
	 i++;if(i>3)i=0;
    }
void main(void)
{TMOD=0x01;TH0=hi;TL0=lo;EA=1;ET0=1;TR0=1;
 while(1)
 {hextodec();
  display();
  delay(22);}		   
 }