AD7719谁用过稳定性怎么样？

张衍波 · 发表于 2015-9-17 08:11:53

打算用AD7719因为他带有200uA恒流，不知道他的抗干扰能力，和数据稳定到多少位

从ADI申请的样片到了，焊接到板子上发现无法写入寄存器的值和读出的不一样，不知道为什么，用过的帮忙看看什么问题，谢谢

#define AD7719_RCC_APB2Periph_GPIOx       RCC_APB2Periph_GPIOD
#define AD7719_GPIOx                GPIOD
#define AD7719_DIN_Px                GPIO_Pin_13
#define AD7719_SCLK_Px                GPIO_Pin_12
#define AD7719_RDY_Px                GPIO_Pin_11
#define AD7719_DOut_Px                GPIO_Pin_14

#define AD7719_DIN_CLR()  GPIO_ResetBits(AD7719_GPIOx,AD7719_DIN_Px);
#define AD7719_DIN_SET()  GPIO_SetBits(AD7719_GPIOx,AD7719_DIN_Px);
#define AD7719_SCLK_CLR() GPIO_ResetBits(AD7719_GPIOx,AD7719_SCLK_Px);
#define AD7719_SCLK_SET() GPIO_SetBits(AD7719_GPIOx,AD7719_SCLK_Px);

#define AD7719_RDY_CLR()  GPIO_ResetBits(AD7719_GPIOx,AD7719_RDY_Px);
#define AD7719_RDY_SET()  GPIO_SetBits(AD7719_GPIOx,AD7719_RDY_Px);
#define AD7719_RDY_Get() GPIO_ReadInputDataBit(AD7719_GPIOx, AD7719_RDY_Px)

#define AD7719_DOut_CLR() GPIO_ResetBits(AD7719_GPIOx,AD7719_DOut_Px);
#define AD7719_DOut_SET() GPIO_SetBits(AD7719_GPIOx,AD7719_DOut_Px);
#define AD7719_DOut_Get() GPIO_ReadInputDataBit(AD7719_GPIOx, AD7719_DOut_Px)

#define WriteReg                      0x00//写寄存器
#define ReadReg                               0x40//读寄存器
#define CommReg                               0x00//通信状态寄存器
#define ModeReg                               0x01//模式寄存器
#define MainControlReg             0x02//主控制寄存器
#define AuxControlReg             0x03//辅助控制寄存器
#define FilterReg                      0x04//滤波寄存器
#define MainDataReg                      0x05//主数据寄存器
#define AuxDataReg                      0x06//辅助数据寄存器
#define IOControlReg             0x07//IO控制寄存器
#define MainOffsetReg             0x08//主失调校准寄存器
#define AuxOffsetReg             0x09//辅助失调校准寄存器
#define MainGainReg                      0x0A//主增益校准寄存器
#define AuxGainReg                      0x0B//辅助增益校准寄存器
#define Test1Reg                      0x0C//测试寄存器1
#define Test2Reg                      0x0D//测试寄存器2
#define IDReg                               0x0F//ID寄存器

#define ModeRegVal                      0x03//模式寄存器设置值  开启BUF 差分输入连续转换
#define MainControlRegVal       0x88//主AIN1-AIN2 单极性 20mv
#define IOControlRegVal             0x0100//200uA在IOUT1输出

void AD7719Delay(void)
{
      unsigned char i;
      for(i=0;i<40;i++);
}

void AD7719_GPIO_Configuration(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_APB2PeriphClockCmd(AD7719_RCC_APB2Periph_GPIOx, ENABLE);

      GPIO_InitStructure.GPIO_Pin =  AD7719_DOut_Px | AD7719_RDY_Px;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(AD7719_GPIOx, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = AD7719_DIN_Px  | AD7719_SCLK_Px;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_Init(AD7719_GPIOx, &GPIO_InitStructure);

//       AD7719_CS_SET();
}

/**
  * @brief  读写数据
  * @param  WriteBuffer
  * @param  ReadBuffer
  * @param  NumberOfByte
  * @retval None
  */
void AD7719ReadWriteBuf(unsigned char* WriteBuffer, unsigned char *ReadBuffer, unsigned char NumberOfByte)
{
      unsigned       char       WriteData, ReadData;
      unsigned       char       i, j;

      AD7719_SCLK_SET();
//       AD7719_CS_CLR();

      for(i=0; i<NumberOfByte; i++)
      {
               WriteData = *(WriteBuffer + i);
            ReadData = 0;

            for(j=0; j<8; j++)
            {
                     AD7719_SCLK_CLR();

                     if(0x80 == (WriteData & 0x80))
                     {
                              AD7719_DIN_SET();       //Send one to SDI pin
                     }
                     else
                     {
                              AD7719_DIN_CLR();       //Send zero to SDI pin
                     }
                     WriteData = WriteData << 1;

                     AD7719_SCLK_SET();

                     ReadData = (ReadData<<1) | AD7719_DOut_Get();
            }
            *(ReadBuffer + i)= ReadData;
      }
      AD7719_SCLK_SET();
//       AD7719_CS_SET();

}

void AD7719_Configuration(void)//初始化
{
unsigned char Write[3],Read[3];
      AD7719_GPIO_Configuration();
      DelayMs(10);

      Write[0] = WriteReg|ModeReg;//
      Write[1] = ModeRegVal;
      AD7719ReadWriteBuf(Write,Read,2);
      DelayMs(1);

      Write[0] = WriteReg|MainControlReg;
      Write[1] = MainControlRegVal;
      AD7719ReadWriteBuf(Write,Read,2);
      DelayMs(1);

      Write[0] = WriteReg|IOControlReg;
      Write[1] = IOControlRegVal>>8;
      Write[2] = IOControlRegVal&0xFF;
      AD7719ReadWriteBuf(Write,Read,3);
      DelayMs(1);

      while(AD7719_RDY_Get());
      Write[0] = ReadReg|ModeReg;//
      AD7719ReadWriteBuf(Write,Read,1);
      DelayMs(1);
      Write[0] = 0xFF;//
      AD7719ReadWriteBuf(Write,Read,1);

      while(AD7719_RDY_Get());
      Write[0] = ReadReg|MainControlReg;//
      AD7719ReadWriteBuf(Write,Read,1);
      DelayMs(1);
      Write[0] = 0xFF;//
      AD7719ReadWriteBuf(Write,Read,1);

      while(AD7719_RDY_Get());
      Write[0] = ReadReg|IOControlReg;//
      AD7719ReadWriteBuf(Write,Read,1);
      DelayMs(1);
      Write[0] = 0xFF;//
      AD7719ReadWriteBuf(Write,Read,2);
      while(AD7719_RDY_Get());

//       Write[0] = ReadReg|MainDataReg;
//       AD7719ReadWriteBuf(Write,Read,1);
//       DelayMs(1);
}

unsigned long AD7719_GetValue(void)
{
unsigned char Write[3],Read[3];
//       while(AD7719_RDY_Get());
      Write[0] = ReadReg|IOControlReg;//
      AD7719ReadWriteBuf(Write,Read,1);
      DelayMs(1);
      Write[0] = 0xFF;//
      Write[1] = 0xFF;//
      Write[2] = 0xFF;//
      AD7719ReadWriteBuf(Write,Read,3);
//       while(AD7719_RDY_Get());
      return 0;
}
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