tms320c5535芯片i2s数据接收寄存器一直是0

    hI2s = I2S_open(I2S_INSTANCE, DMA_POLLED, I2S_CHAN_STEREO);
    if(NULL == hI2s)
    {
        status = CSL_ESYS_FAIL;
        return (status);
    }
    else
    {
        printf ("I2S Module Instance opened successfully\n");
    }

    if (I2S_INSTANCE0 == I2S_INSTANCE)
    {
     status = SYS_setEBSR(CSL_EBSR_FIELD_SP0MODE,
        CSL_EBSR_SP0MODE_1);
    }
 else
 {
  status = SYS_setEBSR(CSL_EBSR_FIELD_PPMODE,
        CSL_EBSR_PPMODE_6);
 }

 if(CSL_SOK != status)
    {
        printf("SYS_setEBSR failed\n");
        return (status);
    }

    /* Set the value for the configure structure */
    hwConfig.dataFormat     = I2S_DATAFORMAT_LJUST;
    hwConfig.dataType       = I2S_STEREO_ENABLE;
    hwConfig.loopBackMode   = I2S_LOOPBACK_DISABLE;
    hwConfig.fsPol          = I2S_FSPOL_LOW;
    hwConfig.clkPol         = I2S_RISING_EDGE;//I2S_FALLING_EDGE;
    hwConfig.datadelay      = I2S_DATADELAY_ONEBIT;
    hwConfig.datapack       = I2S_DATAPACK_DISABLE;
    hwConfig.signext        = I2S_SIGNEXT_DISABLE;
    hwConfig.wordLen        = I2S_WORDLEN_16;
    hwConfig.i2sMode        = I2S_SLAVE;
    hwConfig.clkDiv         = I2S_CLKDIV2; // don't care for slave mode
    hwConfig.fsDiv          = I2S_FSDIV32; // don't care for slave mode
    hwConfig.FError         = I2S_FSERROR_DISABLE;
    hwConfig.OuError        = I2S_OUERROR_DISABLE;

    /* Configure hardware registers */
    status = I2S_setup(hI2s, &hwConfig);
    if(status != CSL_SOK)
    {
        return (status);
    }
    else
    {
        printf ("I2S Module Configured successfully\n");
    }