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TMS570LS3137-EP: Pin 127 Remains Continuously High Despite Code Setting to Low

Part Number: TMS570LS3137-EP

Tool/software:

Hello,

I am currently working with TMS5703137DPGEQQ1 and have encountered an issue where Pin 127 remains continuously high, even though the code explicitly sets it to a low state.

Here are the key details:

  • Controller: TMS5703137DPGEQQ1

    Pin Number: 127

  • Expected Behavior: Pin should be driven low as per code logic

  • Observed Behavior: Pin remains high at all times

  • Code Setting: GPIO configuration sets the pin as an output and writes a logic low (0)

  • Steps Taken So Far:

    • Verified the pin configuration in code

    • Confirmed correct peripheral multiplexing

    • Ensured no external pull-up on the pin

Could you please advise on possible causes for this behavior? Additionally, are there any known silicon errata or constraints for this pin?

Thank you for your support.

Best regards,

Shardul Gogate.

  • Hi Shardul ,

    There are no known issues related to this pin and this pin should work as GIO.

    I don't have this board to test it on my end, however i created a project with proper settings.

    Here is the project:

    Customer_Issue_Pin127_GPIO_LOW_LS3137PGE.zip

    Can you please test this project as it is on your setup?

    The only thing you might need to change is:

    I created this project is for XDS100v2 debugger, verify your debugger and change this setting according to it. Keep remaining everything same and test it.

    The pin should go to Low after executing below instruction.

    --
    Thanks & regards,
    Jagadish.