DLP4500: Problem loading images from Flash with C++ code

Luca Zanotto

Part Number: DLP4500
Other Parts Discussed in Thread: DLPC350

Hello!

I am trying to write my own C++ code to control a DLP4500 Lightcrafter. I started from the Source Code of the GUI (version 4.0.0), working in the Qt environment.

I am able to communicate with the device and modify most of the parameters (source, trigger, exposure time, ...), using the functions of the Source Code.

What I am not yet able to do, it is to load one image from the internal Flash memory, and have it displayed on the DMD.

I built the firmware using the GUI, and loaded my own images onto the Flash, and everything works fine with the GUI.

I have the feeling I did not grasp how to use the functions that take an Index as input and then load the corresponding image stored in the Flash. For example there are the "LoadImageIndex" and the "SendImageLut", which seem to be meant to do so, but I am not quite sure I am using them correctly.

Are you able to give me some hints? I hope I have made myself clear enough.

Thanks a lot!

Luca

over 5 years ago

0 Philippe Dollo over 5 years ago

TI__Mastermind 28005 points

Luca,

Have you checked out the DLPC350 programmer's guide? https://www.ti.com/lit/ug/dlpu010g/dlpu010g.pdf

This document will show what the I2C commands are which are executed by the GUI when these sorts of operations are issued. If you have a method to spy on the I2C bus, you could compare the I2C commands issued by the GUI to the output of your code, and see what I2C commands (if any) you are missing).

I hope this helps.

Regards,

Philippe

0 Luca Zanotto over 5 years ago in reply to Philippe Dollo

Prodigy 120 points

Hi Philippe,

thanks for your reply!

I did take a look at the programmer's guide but I could not understand how to solve the issue.

I will try and read it more carefully maybe.

Best,

Luca

0 Philippe Dollo over 5 years ago in reply to Luca Zanotto

TI__Mastermind 28005 points

Luca,

Were you able to probe the I2C bus on the device?

Regards,

Philippe

0 Luca Zanotto over 5 years ago in reply to Philippe Dollo

Prodigy 120 points

Philippe,

No, unfortunately I think do not have the proper connector.

Is there any way I can do everything through the USB? Otherwise I will try to get one.

Thanks again,

Luca

0 Philippe Dollo over 5 years ago in reply to Luca Zanotto

TI__Mastermind 28005 points

Luca,

It is possible, if you are able to write software that reads the I2C commands being issued by USB, or otherwise watch the behavior of the USB driver. However, simply probing the I2C line (such as with an oscilloscope or I2C debugger) may yield more definitive results.

Regards,

Philippe

0 Luca Zanotto over 5 years ago in reply to Philippe Dollo

Prodigy 120 points

Philippe,

okay, thanks a lot. I will try that.

Best,

Luca

0 Philippe Dollo over 5 years ago in reply to Luca Zanotto

TI__Mastermind 28005 points

Luca,

You are welcome. Feel free to post back here if you have further issues or development.

Regards,

Philippe

0 herman hen over 5 years ago

Prodigy 10 points

Hello Luca:

I'm trying to control a DLP4500 Lightcrafter now ,but i do not know where to get the Source Code of the GUI (version 4.0.0).

Can you Show me the site?

Thanks a lot !

0 Luca Zanotto over 5 years ago in reply to herman hen

Prodigy 120 points

Hi Herman,

sure you can find the Source Code in the same folder of the GUI, after installing it. The installers are in this page:

https://www.ti.com/tool/DLPLCR4500EVM

you have to click "view all" below the description of the device, and you will find the downloads for the different versions of the GUI.

Best,

Luca

0 Philippe Dollo over 5 years ago in reply to Luca Zanotto

TI__Mastermind 28005 points

Luca,

Thanks for your feedback. This is correct.

Regards,

Philippe

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DLP4500: Problem loading images from Flash with C++ code