adc_0831.c

ad0831模数转换必须

#include <at89x52.h>
#define  uchr unsigned int
#define  D_In   P1_1
#define  Clk    P3_4
#define  CS     P0_0 
void delay(void)
{
   uchr i;
   for(i=0;i<255;i++);
}
uchr AD_Conv(void)
{
  uchr i,Data;
  /* init,set the i_o port*/
  CS=1;
  D_In=1;
  Clk=0;
  /*read the Data;*/
  CS=0;
  for(i=0;i<9;i++)
    {
      Clk=1;
      delay();
      Clk=0;
      Data<<=1;
      if(D_In)Data++;
      delay();
    }
  CS=1;
  return Data;    
}