处理器：Hi3531dv200
sdk：Hi3531DV200R001C02SPC003

目的：VGA输入经AD芯片转换成bt1120然后对接海思

现象：从VI抓图发现没有UV得数据，测量uv data管脚是有时序得。vi配置如下：

hi_vi_dev_attr DEV_ATTR_BT1120_1080P_1MUX_CV8988 = {
    /* interface mode */
    HI_VI_MODE_BT1120_STANDARD,
    /* work mode, 1/2/4 multiplex */
    HI_VI_WORK_MODE_MULTIPLEX_1,
    /* r_mask    g_mask    b_mask */
    //{ 0xff000,0xff0},
    { 0xff0,0xff000 },
    /* for single/double edge, must be set when double edge */
    HI_VI_CLK_EDGE_SINGLE_UP,
    /* enDataSeq, just support yuv */
    HI_VI_IN_DATA_UVUV,
    /* sync info */
    {
        /* port_vsync  port_vsync_neg  port_hsync  port_hsync_neg */
        HI_VI_VSYNC_FIELD,
        HI_VI_VSYNC_NEG_HIGH,
        HI_VI_HSYNC_VALID_SIG,
        HI_VI_HSYNC_NEG_HIGH,
        HI_VI_VSYNC_VALID_SIG,
        HI_VI_VSYNC_VALID_NEG_HIGH,
        /*
         * timing info:
         * hsync_hfb  hsync_act  hsync_hhb
         * vsync0_vhb vsync0_act vsync0_hhb
         * vsync1_vhb vsync1_act vsync1_hhb
         */
        { 0, 0, 0,
          0, 0, 0,
          0, 0, 0 }
    },
    /* data_reverse_en */
    HI_FALSE,
    /* mixed_capture_en */
    HI_FALSE,
};
hi_vi_chn_attr VI_1080P_VGA = {
    /* crop_x crop_y, crop_w  crop_h */
    { 0, 0, 1920, 1080 },
    /* dest_w  dest_h */
    { 1920, 1080 },
    /* capture_select */
    HI_VI_CAPTURE_SELECT_BOTH,
    /* scan mode */
    HI_VI_SCAN_PROGRESSIVE,
    /* pixel_format */
    HI_PIXEL_FORMAT_YVU_SEMIPLANAR_422,
    /* mirror_en  flip_en */
    0,
    0,
    /* compress mode */
    HI_COMPRESS_MODE_NONE,
    /* src_frame_rate   dst_frame_rate */
    -1,
    -1
};

附件是VI通道抓图数据