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F29H85X-SOM-EVM: EPWM output.

Shashank Bikkanuri
Prodigy 150 points
Part Number: F29H85X-SOM-EVM

Tool/software:

I have configured EPWM in up down count mode, and programmed action qualifier such that EPWMXA output is  high on CAD, CBD events . EPWMXA output low on CAU, CBU events. even CMPB is loaded with the zero it is reflecting on output. (in F28 controller, when CMPA, CMPB are loaded with zeros, they do not generating any actions). I need conformation on - " does Counter Compare modules generate events when they are loaded with the zeros in F29 controllers ".

Green - GPIO toggled on the TBCTR = 0 event.

Pink - EPWM output.

No one shot events or Sync In events, No Action qualifier configuration on TBCTR = 0 and TBCTR = TBPRD events.

Thanks, Regards,

Shashank B

  • +1
    TI__Mastermind 25446 points

    Hi Shashank,

    Shashank Bikkanuri said:
    does Counter Compare modules generate events when they are loaded with the zeros in F29 controllers

    With your current configuration of AQCTLA/B, and counter compare values being loaded with 0, they should not output any waveform. Once you update CMPB or CMPA to a non zero value then the waveforms start to appear.

    Here is a simple test case that show cases this.

    1. initially nothing should output on ePWM1A.

    2. When updating CMPB for example, the action will still occur on CMPA down at zero which is expected.

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/171/epwm_5F00_ex1_5F00_trip_5F00_zone.7z

    Best,

    Ryan Ma