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Using ADC PPB limit detection to CBC tripping ePWM

Christian Fuchs1
Expert 1250 points
Other Parts Discussed in Thread: TMS320F28377S

Hello.

I'm using TMS320F28377S. I try to trip a ePWM module cycle by cycle with the ADC PostProcessingBlock limit feature. But if my ADC values reaches the threshold the PWM is tripped permanently even if the ADC value falls under the threshold.

I think this is because the flag in ADCEVSTAT register remains set until I clear it manually. But that is not suitable for CBC tripping.

How can I solve this problem?

Thanks

BR

Christian

  • 0
    TI__Guru 57255 points

    Hi Christian,

    What functionality in the PPB are you utilizing?

    It is usually best to utilize the comparator for CBC tripping (ie peak-current mode/TM type situations).  In many situations, there is a comparator path that can meet a similar need that the PPB was going to be used for.

    If you still wish to use the PPB, you could have the PPB generate an interrupt and clear the PPB flag inside that interrupt.


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Expert 1250 points

    Hi Brett,

    I will try the CMPSS module instead ADC PPB.

    Thank you for your answer.

    BR

    Christian