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Missing Trigger Out w/ using API

Takeshi Yuasa
Expert 1230 points

Hello,

Sometimes we could see the Trigger Out missing in Trigger Mode 0. The followins are what we proceed. Would you please double check?

1) Writhe DLP parameters
①LCR__SetLedEnables
SeqCtrl=false, Red=0, Green=0, Blue=0
②LCR_AddToPatLut
TrigType=1, PatNum=0, BitDepth=8, LEDSelect=6, InvertPat=false, InsertBlack=true, BufSwap=false, trigOutPrev=false
③LCR_SetPatternDisplayMode
external=true
④LCR_SetPatternConfig
numLutEntries=1, repeat=true, numPatsForTrigOut2=1, numSplash=1
⑤LCR_SetExposure_FramePeriod
exposurePeriod=16000, framePeriod=16667
⑥LCR_SetPatternTriggerMode
IntExt_or_Vsync=0
⑦LCR_SendPatLut
⑧LCR_ValidateStatus

2) Power Camera

3) Start Pattern Sequence by LCR_PatternDisplay

4) Camera captures the images

5) Stop Pattern Sequence by LCR_PatternDisplay

6) Repeat 1) to 5)

 

Regards,

Takeshi

  • 0
    TI__Mastermind 30875 points
    Hello Takeshi-san,


    In Trigger Mode = 0, it is very important that the sum of pattern(s) exposure < actual incoming vsync rate.

    Also set the exposurePeriod = framePeriod,

    For example: Let's assume the incoming VSYNC rate is 60Hz, 16.667 ms.
    We want to display 1 8-bit pattern, then set exposurePeriod = framePeriod, set to 16400ms, with this setting you should always see the patterns are displayed properly and no trigger out missing.

    Regards,
    Sanjeev