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LAUNCHXL-F28379D: State of GPIO during power-up

Quentin A
Prodigy 10 points
Part Number: LAUNCHXL-F28379D


Hello everybody,

I use Embedded Coder for coding F28379D C2000 microcontroller. I generate code for the Launchxl board. I have programed an GPIO to switch from 0 to 1 after 100ms. When I probe this signal with a scope, I can see that during the power-up sequence, the signal rise to 3.3V rapidly and just after goes to 0V and finaly go to 3.3V after 100ms. I want to know, why this signal has this start sequence. Maybe the GPIO are High-Z during power-up ? Is it possible to set an internal pull-down ? How can I do that with Embedded Coder ?

Thank you.

Quentin

  • 0
    TI__Mastermind 30185 points

    Hello Quentin,

    Quentin A said:
    When I probe this signal with a scope, I can see that during the power-up sequence, the signal rise to 3.3V rapidly and just after goes to 0V

    Can you please attach a screenshot here and which pin(s) you are scoping? Is this pin connected to anything else besides your scope? Does this occur on any other pins for the LaunchPAD?

    Quentin A said:
    Maybe the GPIO are High-Z during power-up ? Is it possible to set an internal pull-down ?

    By default on restart, the GPIO pins are configured as inputs with the pull-up disabled, so the pin rising would not be explained by the device. If you reset the device without powering it off, do you still see the same behavior on the pin(s)?