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Employing the MCU's PWM Generator to achieve dual, independent outputs or "complementary" outputs...

cb1
Guru 47900 points

Many have asked here for clarification (nitty-gritty) of the MCU's PWM Generators.   While this vendor's MCU manual & Peripheral User Guide are intensive - they do not fully/completely guide prospective users.   Firm/I do not offer "cookbook" style code - illustrated here are several key (yet not all) capabilities of a single, PWM Generator w/in TM4C MCU series.

Dual Outputs of a PWM Generator - identical frequency yet fully independent Duty Cycle.

Switching from "independent" to "complementary" outputs via, "PWMDeadBandEnable()" function w/ parameter values zero'ed.

Note that (ONLY) the addition of "PWMDeadBandEnable()" caused the switch from "independent PWM Output to Complementary!"

         And now Complementary Outputs w/Dead-band parameters set to 200.

Notably - at least by firm's/my read - vendor's manual does not explicitly list, "How to invoke Complementary" PWM Outputs.   Such is here (now) revealed...

Vendor may wish to add - at some point,  "Use of "PWMDeadBandEnable()" function yields the complementary PWM Output (defined by PWM_A) via PWM_B."   As outsider - such suggestions are (most always) "duly noted" yet rarely (i.e. never) survive into vendor's "official" note...   (and vendor's "round file" (surely) over-flows w/such "NIH" suggestions...)

  • Guru 27665 points
    So deadband does actually work.

    Nice summary BTW.

    Robert
  • in reply to Robert Adsett
    Guru 47900 points
    Thank you, Sir - thank you very much.

    Some way/how it was claimed that falling edge (under dead-band) was difficult to view. (i.e. required "video" pause - you/I knew that such was "unlikely" - scope caps here confirm.)
  • in reply to cb1
    TI__Guru 59540 points
    Nice post, CB. I appreciate the time, thought, and effort that went into it.
  • in reply to Chuck Davenport
    Guru 47900 points
    And thank you too, Sir - both for your "post's approval" & for the on-going assistance you provide so many, here...
  • in reply to cb1
    Guru 117855 points

    To those who have (via PM) requested (yet further) detail - please stand by. We'll summarize the various requests & present those in highest demand - as/if (real work) demands relent...

    Thanks for your votes of approval...   (>200 hits/views w/in first 24 hours - for a, "Non-Sticky" - indicates that we might have, "hit a nerve.")