28335与AD7656，急-TI中文支持网

您好，

我dsp通过cs6读取ad7656的测量值，硬件电路中dsp的read信号和cs6信号直接与AD7656连接，数据线一一对应。开始读数据时，对于直流量比较正常，但是读了3-4分钟时，读取的直流量发生了较大幅度的波动，利用示波器测量AD7656的输入信号与基准信号都很稳定。感觉是程序中有问题，仔细核对了程序中关于AD7656的时序，都很正常，感觉是不是xintf中配置有问题？如下：

EALLOW;
    XintfRegs.XINTCNF2.bit.XTIMCLK = 1;
    // No write buffering
    XintfRegs.XINTCNF2.bit.WRBUFF = 0;
    // XCLKOUT is enabled
    XintfRegs.XINTCNF2.bit.CLKOFF = 0;
    // XCLKOUT = XTIMCLK/2
    XintfRegs.XINTCNF2.bit.CLKMODE = 1;

    // Zone 0————————————
    // When using ready, ACTIVE must be 1 or greater
    // Lead must always be 1 or greater
    // Zone write timing
    XintfRegs.XTIMING0.bit.XWRLEAD = 3;
    XintfRegs.XTIMING0.bit.XWRACTIVE = 7;
    XintfRegs.XTIMING0.bit.XWRTRAIL = 3;
    // Zone read timing
    XintfRegs.XTIMING0.bit.XRDLEAD = 3;
    XintfRegs.XTIMING0.bit.XRDACTIVE = 7;
    XintfRegs.XTIMING0.bit.XRDTRAIL = 3;

// double all Zone read/write lead/active/trail timing
XintfRegs.XTIMING0.bit.X2TIMING = 1;

    // Zone will sample XREADY signal
    XintfRegs.XTIMING0.bit.USEREADY = 1;
    XintfRegs.XTIMING0.bit.READYMODE = 1;  // sample asynchronous

    // Size must be either:
    // 0,1 = x32 or
    // 1,1 = x16 other values are reserved
    XintfRegs.XTIMING0.bit.XSIZE = 3;

    // Zone 6————————————
    // When using ready, ACTIVE must be 1 or greater
    // Lead must always be 1 or greater
    // Zone write timing
    XintfRegs.XTIMING6.bit.XWRLEAD = 3;
    XintfRegs.XTIMING6.bit.XWRACTIVE = 7;
    XintfRegs.XTIMING6.bit.XWRTRAIL = 3;
    // Zone read timing
    XintfRegs.XTIMING6.bit.XRDLEAD = 3;
    XintfRegs.XTIMING6.bit.XRDACTIVE = 7;
    XintfRegs.XTIMING6.bit.XRDTRAIL = 3;

// double all Zone read/write lead/active/trail timing
XintfRegs.XTIMING6.bit.X2TIMING = 1;

    // Zone will sample XREADY signal
    XintfRegs.XTIMING6.bit.USEREADY = 1;
    XintfRegs.XTIMING6.bit.READYMODE = 1;  // sample asynchronous

谢谢，急

rookiecalf：

如果通过XINTF能够读到数据且不是明显错误的话，那应该不是XINTF的问题。同时也需要确认一下数据总线是否有虚连接等情况。

确定总线无明显问题的话，建议把重点放在AD7656的配置上。

您好，

// double all Zone read/write lead/active/trail timing
XintfRegs.XTIMING0.bit.X2TIMING = 1;

    // Zone will sample XREADY signal
    XintfRegs.XTIMING0.bit.USEREADY = 1;
    XintfRegs.XTIMING0.bit.READYMODE = 1;  // sample asynchronous

    // Size must be either:
    // 0,1 = x32 or
    // 1,1 = x16 other values are reserved
    XintfRegs.XTIMING0.bit.XSIZE = 3;

// double all Zone read/write lead/active/trail timing
XintfRegs.XTIMING6.bit.X2TIMING = 1;

    // Zone will sample XREADY signal
    XintfRegs.XTIMING6.bit.USEREADY = 1;
    XintfRegs.XTIMING6.bit.READYMODE = 1;  // sample asynchronous

谢谢，急

haixin wang：

回复 rookiecalf:

ADC采集正弦信号波形瑕疵求指教 ADC芯片为AD7656，频率5khz时波形正常，上升到10khz时波形间歇性出现如图情况，求高手指点谢谢，图见附件。

28335与AD7656，急

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