DLPC3478: 1bit pattern issue

Hello Kim,

Welcome back to the E2E forum. Thank you for your continued business!

We are looking into the issue and will get back to you in a few days with our findings.

Best,

Maxine

Hello Kim,

Could you clarify the following:

1.Is this a custom board or are you using an EVM?

2.Are you using the latest firmware version: 9.0.1?

3.Can you explain in a little more detail what is different(other than the changed patterns) between each case? Especially between case 2, 3 and, 4.

4. I would also suggest scoping the Trig 1 and Trig 2 pins to make sure you are getting the expected output. 

Best,

Maximus

Dear Rusi 

Thank you for your reply. 

Did you see attached files? 

1.Is this a custom board or are you using an EVM?

[ES] Custom Board. FPGA <--> DLP3478  , External Interface Bus 

2.Are you using the latest firmware version: 9.0.1?

[ES]  Yes. I checked 2 firmware that are 8.0 and 9.0.1.

3.Can you explain in a little more detail what is different(other than the changed patterns) between each case? Especially between case 2, 3 and, 4.

 [ES]  As I mentioned , it was happened the issues under conditions of  2/3/4 patterns. 

         Did you see the attached files? 

Condition 2) Mixed 1bit Pattern Configurations 

                      The pattern of beam : Momentary Tremor ( The frames that treble monentarly vary depending on the configuration of the 1bit pattern. 

Condition 3/4) All same 1bit pattern. 

                      After a cerrain period, the beam projection survey configuration changes. The alered pattern shape is visible to the naked eye. 

Thanks 231204_1bit Pattern Issue.zip

Added

4. I would also suggest scoping the Trig 1 and Trig 2 pins to make sure you are getting the expected output. 

: I checked trigger out for DLPC3478. The Trigger signal was OK. 

Hi Kim,

Thank you for the information, I have seen your attached slides and videos. I'd like to recreate this issue on my end, could you also send me the timings you are using in the GUI? 

Best,

Maximus

Hi LP Kim,

Could you give us more detail on the following:

1.How are the cameras setup to capture this?

2.What timings are you using in the internal pattern control mode?

3.Could you test this with a vertical pattern and let us know if you experience this issue?

Best,

Maximus

Dear Rusi 

 I'm late for the reply and will be update data that you requested as soon as possible. 

2.What timings are you using in the internal pattern control mode?

[LP KIM] I am using the external interface mode. 8bit x 3 frame. 

3.Could you test this with a vertical pattern and let us know if you experience this issue?

[LP KIM] If I change the horizontal  light direction & horizontal pattern (or the vertical light direction & vertical pattern) instead of direction horizontal light direction & horizontal pattern , i don't see issue by now. 

Best & Regards 

Hi LP Kim,

To clarify, you are using external mode via hdmi?

Best,

Maximus

Dear Maximus Rusi 

To clarify, you are using external mode via hdmi?

[LP KIM] 

I am using the external mode with FPGA. 

Hello LP Kim,

Could you send us your design files to review? I have sent you a friend request so we can continue this discussion via private message.

Best,

Maximus

Dear Maximus Rusi

Could you send us your design files to review?

[LP KIM] Do you want to get HW Design file such as PCB and schematic? 

Because it isn't to happen to issue under different pattern configuration and all same 8bit Pattern, I think that it isn't not hardware issue. 

CASE1) 1bit , all same : Issue 

CASE2) 8bit , all same : No Issue

CASE3) 1bit, same pattern mixing : No issue 

Thanks

CASE1_2_3_CONFIGURATION.zip

Dear Maximus Rusi

1.How are the cameras setup to capture this?

[LP KIM] 

Our product : Trigger mode , 3 frame *  20Hz= 60fps. 
Mobile phone : captured 

I can see the issue from our product beam the naked eye directly.

Thanks  

Hi LP Kim,

Thank you for the information. We are currently working on your question and will get back to you by next week.

Regards,

Lori 

Hi LP Kim,

Are you able to reproduce these issues on a TI EVM? Could you also try these test using internal pattern control and seeing if you see the same issue?

Best,

Maximus

Dear Maximus Rusi 

I will check the issue usign TI EVM with the same pattern configuration. 

Thanks 

Best Regards 

Hi LP Kim,

Thank you, please let us know if you see the same behavior. 

Best,

Maximus