CCS/TMS320F280049C: Graph tools to show waveform for debugging

Minghan Dong

Prodigy 360 points

Part Number: TMS320F280049C

Tool/software: Code Composer Studio

Hi,

Graph cannot output right waveform for debugging in our design.

(1) Setting

We storage data in a array(length=2000) in ePWM1 ISR. When the ISR freq is 100kHz, the waveform is right. When the ISR freq is not 100kHz(90kHz 80kHz 60 kHz), the waveform is wrong.

Graph tools setting:

(2) Waveform

Wrong wave form(ISR freq=90kHz)

Right waveform(ISR freq=100kHz)

over 5 years ago

0 Minghan Dong over 5 years ago

TI__Prodigy 360 points

Hi Ki,

Could you kindly give some comments about this issue?

Thanks！

0 Minghan Dong over 5 years ago

TI__Prodigy 360 points

Hi Ki,

Could you kindly give some comments about this issue?

Thanks！

0 Ki over 5 years ago in reply to Minghan Dong

TI__Guru**** 473271 points

Hi Minghan,

Sorry for the delay. I'm not sure what the issue is either. Usually issues occur when the frequency is increased (where it conflicts with the limitations of the graph refresh rate), not decreased. I will need to set up an environment to try and reproduce this behavior.

0 Minghan Dong over 5 years ago in reply to Ki

TI__Prodigy 360 points

Hi Ki,

Are there any progress on this issue? We found another bug: if we change grid frequency(graph catch the grid voltage), the graph shows wrong waveform as well?

Thank you!

0 Minghan Dong over 5 years ago in reply to Minghan Dong

TI__Prodigy 360 points

Hi Ki,

Are there any progress on this issue? Are there any other ways to answer this question??

Thank you!

0 Ki over 5 years ago in reply to Minghan Dong

TI__Guru**** 473271 points

Minghan,

I have been trying to reproduce this issue with my F280049C LaunchPad. I am unable to (the graph looks fine). What would be helpful if you can provide a test case. Project+source+executable file. It can be a stripped down simple version of it. Please start a private E2E conversation with me if you do not wish to share publicly on this forum.

Thanks

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CCS/TMS320F280049C: Graph tools to show waveform for debugging