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MSPM0G1519: Timer counter direction in up/ down mode

Munan Xu
Expert 5310 points
Part Number: MSPM0G1519


Hello,

Is there a way in TIMA for a user to determine which direction the timer counter is currently counting in software?

The CTRCTL.CM doesn't help here since we then just know that the timer is in up/down mode but not the current direction.

Munan

  • 0
    TI__Expert 5310 points

    Any feedback here?

    Munan

  • 0 in reply to Munan Xu
    TI__Mastermind 30346 points

    Hi Munan,

    customer want to check current in up phase or down phase, and the configuration is UP/DOWM mode, correct?

    Why they need know this one? We have separate CC interrupt for UP or DOWN.

    Another idea here is enable Load and zero interrupt, then use those interrupt flag to check current mode.

    Thanks!

    Best Regards

    Johnson 

  • 0 in reply to Johnson He
    TI__Expert 5310 points

    Hey Johnson,

    The reason why this is needed is because the customer wants to count the duration of a fault condition in the timer, so in order to do that they need to know the start and end count and direction and at least one of the directions because it is possible for the timer to have either hit the timer period count or zero and changed direction. The fault condition is also asynchronous to the cc events.

    And yes, you can use the load events or zero events to change a software flag but ideally there's a way in hardware to do this to reduce software overhead.

    Munan