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CCS/TMS320F280049: PWM output change to Hi-z

Jozef Sedivy
Intellectual 270 points
Part Number: TMS320F280049

Tool/software: Code Composer Studio

Hi all,

I have an issue in my application that PWM output changes from output to Hi-z state after the change of duty cycle about 5%. 
Is this issue somehow documented? What should cause such an issue? I am not using comparators or anything which could change of PWM pin setup outside of code.

. 

  • 0
    TI__Guru 60865 points

    Hi Jozef,

    Some of the most obvious ways that the pin could become high-Z:

    • GPIO mux set to something other than the ePWM pin.  It should be a quick check to confirm the mux is still set as originally configured. 
    • A trip zone event is triggered.  The default action in TZCTL and TZCTL2 for all events is to high-Z the pin.  A quick check of this would be to initialize every event in these registers to all '1's = do nothing.  If this fixes the issue, then this indicates that a trip is occurring for some reason.