da.c

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#include<reg52.h>
#include<ABSACC.h>
#include<INTRINS.H>

#define Uint  unsigned int
#define Uchar unsigned char

sbit DataDA = P1^4;
sbit ClkDA = P1^5;
sbit LOAD = P1^6;
sbit LDAC = P1^7;

Uchar flag=0;

void WriteDa(Uchar Dat,Uchar CH);
void Delay5Ms(void);

main()
{  Uchar i,n=10;
   int j=20;
   IE=0x84;
   TCON=0x00;
   while(1)
	{/* XBYTE[0xf8f0]=0;
	  switch(flag)
	    { case 1: {WriteDa(da[i++],0x00);if(i==21)i=0;flag=0;EA=1;}break;
          case 2: {WriteDa(da[j--],0x00);if(j<0)j=5;flag=0;EA=1;}break;
          default:break;
        }*/
      for (i=1;i<n;i++)
      {  
      	WriteDa(256/n*i,0);
      }
      for (i=n-2;i>1;i--){
      		WriteDa(256/n*i,0);}
    }
}  

Int1_process()  interrupt 2 using 0
{   Uchar w=0;
	w=~(XBYTE[0xf8f0]|0xf0);
	if(w==0x08)flag=1;
	else if(w==0x04)flag=2;
	     else flag=0;
    Delay5Ms();
    XBYTE[0xf8f0]=0;
    EA = 0; 
}

void WriteDa(Uchar Dat,Uchar CH)
{
	Uchar i;
	LDAC = 0;
	ClkDA = 0;
	i=Dat;
	for(i=0;i<11;i++)
	{
		ClkDA = 1;
		if(i<3)
		{
			CH<<=1;
			DataDA = CY;
		}
		
		else
		{   Dat <<=1;
			DataDA = CY;
		}
	    _nop_();
	    ClkDA = 0;
    }
	_nop_();
	LOAD = 0;
	_nop_();
	LOAD = 1;
	_nop_();
	ClkDA = 1;
	_nop_();
	ClkDA = 0;
}

void Delay5Ms(void)
{
	Uint i = 5552;
	while(i--);
}