ADV7280A-M MIPI output abnormal

Dear Specialist,

       We've debugging ADV7280A-M for month. Now we can get MIPI output following the web documents guidance. However, seems the image is mirror or need to be rotated.

Can you advice how to correct the image. Does modify any register can help, or it can only be solved from MCU side. 

Parents Reply
  • 0
    •  Analog Employees 
    on Nov 16, 2020 12:44 PM in reply to songyantao

    Hi,

    Interlaced: In early days of television, interlacing was used to reduce the amount of information sent for each image. By transferring the odd-numbered lines, followed by the even-numbered line, the amount of information sent for each image was halved. So that  fps also be halved
     So for the resolution 720*288, when disable  the i2p the frame rate should be 25 fps.

    Note: I2P works by 'line-doubling' i.e. outputting the same line twice and doubling the MIPI CSI-2 clock speed. Please note that In interlaced mode the ADV7282-M outputs with a 216 Mbps data rate (MIPI clock frequency 108 MHz).
    In progressive mode (i.e. I2P mode on) the ADV7282-M outputs a 432 Mbps data rate ( MIPI clock frequency 216 MHz).

    Thanks,

    Poornima

Children
  • hi sir

         -01 08:16:59.260  1548  5677 D CameraHardwareComip: preview frames : 608, fps : 50
    01-01 08:17:02.280  1548  5677 D CameraHardwareComip: preview frames : 759, fps : 50
    01-01 08:17:05.300  1548  5677 D CameraHardwareComip: preview frames : 910, fps : 50
    01-01 08:17:08.320  1548  5677 D CameraHardwareComip: preview frames : 1061, fps : 50
    01-01 08:17:11.340  1548  5677 D CameraHardwareComip: preview frames : 1212, fps : 50
    01-01 08:17:14.361  1548  5677 D CameraHardwareComip: preview frames : 1363, fps : 50
    01-01 08:17:17.380  1548  5677 D CameraHardwareComip: preview frames : 1514, fps : 50
    01-01 08:17:20.400  1548  5677 D CameraHardwareComip: preview frames : 1665, fps : 50
    01-01 08:17:23.421  1548  5677 D CameraHardwareComip: preview frames : 1816, fps : 50
    01-01 08:17:26.440  1548  5677 D CameraHardwareComip: preview frames : 1967, fps : 50
    01-01 08:17:29.460  1548  5677 D CameraHardwareComip: preview frames : 2118, fps : 50
    01-01 08:17:32.479  1548  5677 D CameraHardwareComip: preview frames : 2269, fps : 50
    01-01 08:17:35.500  1548  5677 D CameraHardwareComip: preview frames : 2420, fps : 50
    01-01 08:17:38.520  1548  5677 D CameraHardwareComip: preview frames : 2571, fps : 50
    01-01 08:17:41.539  1548  5677 D CameraHardwareComip: preview frames : 2722, fps : 50
    01-01 08:17:44.560  1548  5677 D CameraHardwareComip: preview frames : 2873, fps : 50
    01-01 08:17:47.579  1548  5677 D CameraHardwareComip: preview frames : 3024, fps : 50
    01-01 08:17:50.599  1548  5677 D CameraHardwareComip: preview frames : 3175, fps : 50

      I change the mipi clk 108M , but the fps is still 50  in disabled i2P mode ? what should I do? 

                                                                                                                                 tks

  • second problem, camera prievew is still blurred screen when I disable I2P !

  • hi sir

       I have another question, config 720*288 camera can prievew  but config 720*576 camera can't prievew when disable I2P, so I think threre are some other differences in register config between 576i and 576p !  Do you think so!

  • 0
    •  Analog Employees 
    on Nov 17, 2020 10:33 AM in reply to songyantao

    Hi,

      Please make sure with register 0x5B as 0x80 for interlaced format -i.e Need to disable the advanced timing mode register when I2P is not used.

     

     For 576i (When disable I2P), As we already stated, In interlaced mode,the format would be separated as odd and even field 288 odd +288 even, this is the reason why the camera can able to preview the format 720*288.
     Also note that each frame of video consists of an even and an odd field. You would probably measuring the field rate rather than the frame rate. 

    Thanks,

    Poornima

  • hi ,

        Follow you advice, the screen won't be burn in interlaced mode when camera prievew; But our customer require adv7280m output size 720*576, this nend to enable I2P, so please help me  to find the root cause of the flash screen appearing in the camera preview ! thanks a lot !