I2S 2S2 Receive Left/Right Data Register寄存器里面的数据全是0

Dear TI：

用示波器测量I2S2 RX管脚是有波形的，仿真的时候查看I2S 2S2 Receive Left/Right Data Register寄存器里面的数据全是0；

我的代码设置如下，请帮查看一下问题出在哪里了：

/** Open the device with instance 0                         */
    hI2s = I2S_open(I2S_INSTANCE0, DMA_POLLED, I2S_CHAN_STEREO);
    if(NULL == hI2s)
    {
        status = CSL_TEST_FAILED;
        return (status);
    }
    else
    {
        printf ("I2S Module Instance opened successfully\n");
    }

    hI2s2 = I2S_open(I2S_INSTANCE2, DMA_POLLED, I2S_CHAN_STEREO);
    if(NULL == hI2s2)
    {
        status = CSL_TEST_FAILED;
        return (status);
    }
    else
    {
        printf ("I2S Module Instance opened successfully\n");
    }
/** Set the value for the configure structure               */
    hwConfig.dataType           = I2S_STEREO_ENABLE;
    hwConfig.loopBackMode       = I2S_LOOPBACK_ENABLE;
    hwConfig.fsPol              = I2S_FSPOL_LOW;
    hwConfig.clkPol             = I2S_FALLING_EDGE;
    hwConfig.datadelay          = I2S_DATADELAY_ONEBIT;
    hwConfig.datapack           = I2S_DATAPACK_ENABLE;
    hwConfig.signext            = I2S_SIGNEXT_DISABLE;
    hwConfig.wordLen            = I2S_WORDLEN_16;
    hwConfig.i2sMode            = I2S_MASTER;
    hwConfig.clkDiv             = I2S_CLKDIV128;
    hwConfig.fsDiv              = I2S_FSDIV32;
    hwConfig.FError             = I2S_FSERROR_DISABLE;
    hwConfig.OuError            = I2S_OUERROR_DISABLE;

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

    result = I2S_setup(hI2s2, &hwConfig);
    if(result != CSL_SOK)
    {
        status = CSL_TEST_FAILED;
        return (status);
    }
    else
    {
        printf ("I2S Module Configured successfully\n");
    }