c51-hx711

/**************************************************************
24bit HX711参考驱动程序
在C中调用: 
extern unsigned long ReadAD(void);           .           .       
unsigned long data;           
data=ReadAD();           .           . 
-------------------------------------------------------------*/
sbit ADDO = P1^5;
sbit ADSK = P0^0; 
unsigned long ReadCount(void){   
  unsigned long Count;  
  unsigned char i;   
  ADSK=0;       //使能AD（PD_SCK 置低）  
  Count=0;   
  while(ADDO);    //AD转换未结束则等待，否则开始读取  
  for (i=0;i<24;i++)  {     
    ADSK=1;     //PD_SCK 置高（发送脉冲）     
    Count=Count<<1; //下降沿来时变量Count左移一位，右侧补零    
    ADSK=0;     //PD_SCK 置低    
    if(ADDO) Count++;  
  }   
  ADSK=1;   
  Count=Count^0x800000;//第25个脉冲下降沿来时，转换数据  
  ADSK=0;   
  return(Count);
}