DLP4500: How many patterns at most could be projected in sequence using pattern sequence mode ?

Shaoxin Huang

Part Number: DLP4500
Other Parts Discussed in Thread: DLPC350

Hi DLP4500 team,

I'm using DLP4500EVM to project pattern sequence. I understand that the internal flash can store up to 64 24-bit images. Right now, I can successfully project 1536 (64*24) 1-bit image sequence using the pattern sequence [variable exposure] mode with the internal flash source. But when I increase the number of patterns (e.g. 2000), the GUI just crashes. Specifically, when I load the .ini file (1536 patterns) and click 'Send', the sequence could be successfully validated and the patterns could be well projected; but if I modify the .ini file to 2000 patterns, the GUI just crashes immediately when I click 'Send'. I then change the pattern source to video port,same issue.

So I'd like to know if I can set a larger number of sequence in the .ini file without crashing in pattern sequence mode using video port source. If I have up to 10000 patterns needed to be projected, is there a way that I can still make it in the pattern sequence mode ? If not, my only choice now is using the video mode ? If using the video mode, how to synchronize the video frames with the external DAQ ?

Best regards,

Shaoxin

over 1 year ago

0 Alexander Chan over 1 year ago

TI__Expert 7020 points

Hi Shaoxin,

Thanks for reaching out to the E2E forums.

Please give us some time to look into this issue.

Thanks,

Alex Chan

0 Alexander Chan over 1 year ago in reply to Alexander Chan

TI__Expert 7020 points

Hi Shaoxin,

In the DLP4500 EVM user guide are you storing the images in flash like so?

https://www.ti.com/lit/pdf/dlpu011

Thanks,

Alex Chan

0 Shaoxin Huang over 1 year ago in reply to Alexander Chan

Prodigy 20 points

Yes, exactly. We can create up to 64 24-bit images from 1536 1-bit bmp images using this way. We understand 64 is the maximum flash capacity. But the key thing is, we want to project up to 10000 1-bit images. So perhaps we can use the video port instead of the flash source in the pattern sequence mode to realize the projection of large number of patterns. But unfortunately, when we modify the .ini file with more patterns, the sequence cannot be sent and the GUI crashes immediately. So we are wondering how to fix it ? or what else methods can we use to realize large scale (like 10000) pattern generation ? Thx.

0 Alexander Chan over 1 year ago in reply to Shaoxin Huang

TI__Expert 7020 points

Hi Shaoxin,

Understand I will look into this further thank you for your patience.

Thanks,

Alex Chan

0 Alexander Chan over 1 year ago in reply to Alexander Chan

TI__Expert 7020 points

Hi Shaoxin,

So the EVM has the DLPC350 Controller which has 32 MB flash memory. This 32 MB flash memory is used for the firmware as well as the images and the limit is 64 24 bit images so if you increase above the limit, there may be problems like you are seeing. Unfortunately this flash memory size of 32 MB is fixed to two 128 Mb memory chips.

If you are not wanting to use flash memory is there any way to just use external interface. The operating modes are pretty flexible where you do not have to necessary use flash memory.

Thanks,

Alex Chan

0 Shaoxin Huang over 1 year ago in reply to Alexander Chan

Prodigy 20 points

Ok, thanks.

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DLP4500: How many patterns at most could be projected in sequence using pattern sequence mode ?