4 Replies Latest reply on Jan 4, 2019 6:54 PM by jingc_3301211

    how to implement 24bit uvc rgb888 base on an75779

    jingc_3301211

      Hi,

      my FPGA board output 720P/60fps RGB888 signals and is proved on lcd panel.

      now I want to implement on fx3 board.

       

      first step I modified the descriptors as following.

        /* GUID, globally unique identifier used to identify streaming-encoding format: RGB888  */

          0x7D, 0xEB, 0x36, 0xE4,             /* MEDIASUBTYPE_RGB888 GUID: E436EB7D-524F-11CE-9F53-0020AF0BA770 */

          0x4F, 0x52, 0xCE, 0x11,

          0x9F, 0x53, 0x00, 0x20,

          0xAF, 0x0B, 0xA7, 0x70,

          0x18,                               /* Number of bits per pixel: 24 */

       

      /* Class specific Uncompressed VS frame descriptor 2 - 720p@ 60fps*/

          0x1E,                               /* Descriptor size */

          CX3_CS_INTRFC_DESCR,                /* Descriptor type*/

          0x05,                               /* Subtype: Uncompressed frame interface*/

          0x01,                               /* Frame Descriptor Index: 1 */

          0x00,                               /* No Still image capture method supported */

          0x00, 0x05,                         /* Width in pixel: 1280 */

          0xD0, 0x02,                         /* Height in pixel: 720 */

          0x00, 0x00, 0x1A, 0x4F,            /* Min bit rate @60ps (bits/s): 720 x 1280 x 3 x 60 x 8 = 1327104000 */

          0x00, 0x00, 0x1A, 0x4F,             /* Max bit rate @60fps (bits/s). 720 x 1280 x 3 x 60 x 8 = 1327104000 */

          0x00, 0x30, 0x2A, 0x00,             /* Maximum video frame size in bytes(Deprecated): 1280 x 720 x 3   */

          0x0A, 0x8B, 0x02, 0x00,             /* Default frame interval (in 100ns units): 166666 */

          0x01,                                              /* Frame interval type : No of discrete intervals */

          0x0A, 0x8B, 0x02, 0x00,             /* Frame interval 3: Same as Default frame interval */

       

      then I modified GPIF interface

      1. set 24bit

      2. set

      LD_DATA_COUNT  4091

      LD_ADDR_COUNT  4091

      3. set FV/LV polarity

      generated new cyfxgpif2config.h

       

      what other code should I modify?

      io_cfg.isDQ32Bit   should be true or false?

      do I need to change DMA?

       

      thanks a lot!