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DLP4500: Unclear elements to the documentation on the Lightcrafter 4500 EVM module

Stan Richards
Prodigy 150 points
Part Number: DLP4500
Other Parts Discussed in Thread: DLPC350

Our intention with the DLP Lightcrafter 4500 is to play a sequence of single bit images at high frame rates, synchronized with an external photodiode for a structured light application.

As per the EVM we understand that we need to use Pattern Sequence mode to bypass video processing effects. This mode takes input from multiple interfaces and as far as we can tell, as the number of patterns required in our sequences is greater then the storage capacity of the flash memory it is recommended to use one of the external interfaces.

We have our patterns formatted into 24 bit bmp images, which we intend to use the RGB interface and stream over HDMI. With the example given that streaming images at 60 Frames Per Second would give a functional pattern frame rate of 1440Hz.

Our main question is practically how to achieve the data input of the .bmp files to the video port? Should they be streamed in a particular video file format over the HDMI cable? We want to be able to use python to start and send these patterns/videos to the projector. As far as we can see the EVM guide has not details on how we might expect to send this data.

  • 0
    TI__Mastermind 20045 points

    Hello Stan,

    Your understanding sounds correct. Unfortunately we do not provide software to covert and stream the bitmap images to your EVM. The EVM simply accepts parallel video input and is otherwise source agnostic. You may need to create a Python program with a GUI that precisely displays images. You could also potentially embed your images in a video.

    Alternatively we do have a DLP-ALC-LIGHTCRAFTER-SDK that may help. However, please note the SDK is no longer officially supported and we therefore would be unable to provide technical support with it.

    Thanks,

    Kyle

  • 0 in reply to Kyle Rakos
    Prodigy 150 points

    Hi Kyle,

    Thanks for the clarification, we are going to aim to create a python program to send static .bmp images at a high frame rate. 

    Do you have any advice on what video formats would function with our .bmp's embedded in them if we were to try that route?

    In terms of the SDK it appears that the link is to the SDK for the 900 chip, which will not be designed for the chip on the LCR4500?

    Thanks,

    Stan.

  • 0 in reply to Stan Richards
    TI__Genius 10925 points

    Hi Stan, 

    The HDMI is a physical interface that supports only one format of video data. You can send standard video signal through this HDMI port containing your patterns as video frames. On our EVM we use TFP401x IC to convert the HDMI signal to RGB pixel data, which is then fed to the DLPC350 controller. You can go through the TFP401x Datasheet  for more information about the specific video timings supported by this chip. Your frontend has to be capable of generating HDMI video data at the required framerate. 

    Thanks & Regards,

    Hirak.