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Maximum amount of 24-bit images?

Kari Vienola
Prodigy 105 points
Other Parts Discussed in Thread: DLPC350

Hello,

What is the maximum amount of 24-bit RGB images that can be uploaded to the flash in the LighCrafter 4500? From the DLPC350 datasheet I read that you can have 48 binary patterns that are pre-loaded but does the pre-loaded in this case mean the flash? I understood there are 2 buffers that both contain 24-bits. We would like to at least upload 4 times as many binary patterns in ideal case.

Kind regards,

Kari 

  • 0
    TI__Mastermind 30875 points

    Hello Kari,

    24-bit RGB images in the flash = 14

    48 binary patterns pre-loaded , this refers to frame buffer or RAM space, this is embedded RAM memory inside the DLPC350 controller chip. E2E discussion http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/94/t/269436.aspx

    Basically, what it also means is that, if the test patterns content can be accommodated in 48 binary space you are able to run at higher speed than otherwise. In later case, the controller needs to DMA the contents from flash to frame-buffer this adds overhead latency which is higher than what is is described in Table #6 of DLPC350 datasheet http://www.ti.com/lit/ds/symlink/dlpc350.pdf

    In your case - if there are 4 24-bit RGB worth of images, the pattern display time is influenced the largest Image Load time of the four.

    Regards,

    Sanjeev

  • 0 in reply to Sanjeev
    Prodigy 105 points

    Dear Sanjeev,

    Thank you for the swift answer and I think I got my questions answered. We were more worried about the space on the Flash than the maximum speed achievable speed. 14 times 24 binary patterns should be more than enough for our purposes so we can start planning the next step.

    And if we need more space for patterns, we can always run LC4500 in video mode at 120 Hz, that is if our GFX supports it.

    Best,

    Kari

  • 0 in reply to Sanjeev
    Prodigy 20 points

    Hello Sanjeev,

    I have a similar problem here with Lightcraft 4500.

    I would like to have around 30 24-bit BMP patterns uploaded to the projector memory, is this possible?

    If not, is there a way to extend the flash memory size?

    I don't care too much about loading time for each image pattern.

    Video mode is not an option because I would like the pattern to be run at a range frequencies which conflicts the 60 HZ vsync thing...

    Thanks.

  • 0 in reply to Sanjeev
    Prodigy 20 points

    Hello Sanjeev,

    On page 27 of the User's Guide of lightcraft 4500, it reads:

    Flash: Images stored in flash memory. The flash memory can store up to 64 24-bit compressed
    images.

    Could you please show me how I can upload 64 24-bit compressed images?

  • 0 in reply to Robert Sumner
    TI__Mastermind 30875 points

    Hello Robert,

    As discussed in this thread E2E  http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/94/t/269436.aspx there is about 32MB of memory of which 2MB is utilized for DLPC350 controller application code. Now available memory for images is 30MB only. 

    The RLE compression techniques highly dependent on the image content for level of compression in %. For example - some can be compressed to 90% and some can be only 10%. 

    Now to really find out if you can fit the images in available 30MB budget you need to use GUI and build the DLPC350 firmware file. This is discussed in Section 3.4,3.5 and 3.6 of the User's Guide.

    Regards,

    Sanjeev