ad976.h

利用AD976采一个陀螺仪的数据

/*-----------------------------CS Tied Low Mode-------------------------------*/
#define R_C_L (P2OUT &= ~BIT0)
#define R_C_H (P2OUT |= BIT0)
#define BUSY1 ((P2IN & BIT1)>>1)
#define BYTE_L (P2OUT &= ~BIT2)
#define BYTE_H (P2OUT |= BIT2)
int Rev_Byte;
//int hi_Byte,lo_Byte;
void Init_AD976()
{
  P2DIR |= (BIT0+BIT2);   //RC和BYTE控制口输出
  P2DIR &=~BIT1;   //BUSY输入
  P5DIR = 0x00;    //P5,P6口作为数据输入
  P6DIR = 0x00;
  R_C_H;
}

float Cvt_AD976()
{
  //int Rev_Byte;
  float Voltage=0;
  R_C_L;
  R_C_H;
  while(!BUSY1);   //等待转换完毕
  R_C_H;
  BYTE_L;          // 读高字节
  Rev_Byte=(P6IN<<8)&0xff00;
  //hi_Byte=P6IN;
  Rev_Byte |= P5IN;
  //lo_Byte=P5IN;
  if((Rev_Byte&0x8000)==0x8000)
  {
    Rev_Byte &= 0x7fff;
    Voltage = -(float)(Rev_Byte*10)/32768.0;
  }
  else if((Rev_Byte&0x8000)==0x0000)
  {
    Rev_Byte &= 0x7fff;
    Voltage = (float)Rev_Byte/32768.0*10.0;
  }
  return Voltage;
}