hw10.c

D/A 0832 数模转换芯片实验（C语言编写）

#include<reg51.h>
#include<absacc.h>
#include<intrins.h>
#define uchar unsigned char
#define com8155 XBYTE[0xff20]
#define pa8155 XBYTE[0xff21]
#define pb8155 XBYTE[0xff22]
#define da0832 XBYTE[0x8000]

uchar code  table[20]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xFF,0x0C,0x89,0xDE};
  

void delay(unsigned int i)
{
   unsigned int j,k;
   for(k=0;k<i;k++)
   for(j=0;j<100;j++);  
}

void display(uchar idata *p)
 { uchar d=2;
   com8155=0x43;
   while(d--)
     {uchar  x=6,y=0x20;
      y=~y;
      for(x=0;x<6;x++)       //led display
          {pb8155=table[*(p+x)];
           pa8155=y;
           delay(2);            
           y=_cror_(y,1);
          }
     }
 }
 
void main(void)
  {   uchar idata disbuf[6]={0,8,3,2,5,5}; 
      uchar  m,n,temp,t=0x0f;
      while(1)
       {
      for(m=0;m<=254;m++)      //0----5v
         {da0832=m;
          temp=m;
          n=m;
          m=m&t;        //low 4 bit
          disbuf[5]=m;
          n=n>>4;       //high 4 bit
          disbuf[4]=n;
          display(disbuf);
          display(disbuf);
          display(disbuf);
          //delay(2);
          m=temp;
         }
      m=0xff;          //5----1v
      while(m--)   
         {da0832=m;
          temp=m;
           n=m;
           m=m&t; //low 4 bit
           disbuf[5]=m;
           n=n>>4; //high 4 bit
           disbuf[4]=n;
           display(disbuf);
           display(disbuf);
           display(disbuf);
           delay(2);
           m=temp;
          }
       }
 }