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CCS/TM4C1294NCPDT: Maintain the output pin level when jumping from bootloader to Application

ronnie
Prodigy 140 points
Part Number: TM4C1294NCPDT

Tool/software: Code Composer Studio

Hi

I had a bootloader which maintains PL3 at high and should remain at high after it has handled a firmware update and jumping to the newly flashed application.

There is a small spike spotted at PL3 which is causing problems for my output buffer chip.

Hoping to have any pointers for how to make this small spike disappear ?

Attached scope capture. Wave 2 is the output signal from Tiva's PL3.

regards, GH

  • 0
    TI__Guru 72500 points

    It depends on how your bootloader jumps to the application code. What is channel 1? 

    If you are generating a reset to jump from the bootloader to the application, you can add a pullup resistor externally to maintain a high level.