AD7730通信问题？

只看该作者 · 2015-3-10 16:55

我根据官网例程模拟SPI通信方式与AD7730通信，RDY脚一直是高，哪位高手指点一下，看看什么情况？void SPI_WriteByte(unsigned char TxData)
{
unsigned char tmp,i;
      tmp=0x80;
      AD7730_CLK_1();
      for(i=0;i<8;i++)
      {
            AD7730_CLK_0();
            if((tmp & TxData)==0x00)
            {
                     AD7730_DIN_0();
            }
            else
            {
                     AD7730_DIN_1();
            }
            SPI_delay();
            AD7730_CLK_1();
            tmp>>=1;
            SPI_delay();
      }
}

void writetoreg(unsigned char byteword)
{
      CS_DISABLE();
      SPI_WriteByte(byteword);
      CS_ENABLE();
}

void Ad7730_Init(void)
{
      //Reset7730();
      writetoreg(0x03);
      writetoreg(0x80);
      writetoreg(0x00);
writetoreg(0x10);//

      writetoreg(0x04);
      writetoreg(0x20);//

      writetoreg(0x02);
      writetoreg(0xB1);
      writetoreg(0x80);
      while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_4))
      writetoreg(0x02); // Writes to Communications Register Setting Next Operation as Write to Mode Register
      writetoreg(0x91);
      writetoreg(0x80);
while(GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_4));// Wait for RDY pin to go low to indicate end of calibration cycle
writetoreg(0x02);
      writetoreg(0x31);
      writetoreg(0x80);
// while(GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_4));// Wait for RDY pin to go low to indicate end of calibration cycle

      writetoreg(0x21);
}