A PWM question

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  1. - 20th January 2011, 03:32 #1
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    Default A PWM question

    If I am using this statement, PWM portb.7, 127,100.

    Is there a way to stop it before it finishes?

    Thanks, Don
  2. - 20th January 2011, 04:35 #2
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    Yes, remove power from the PIC

    Once you start a pwm software based pwm, it will complete before it moves on.
    http://www.scalerobotics.com
  3. - 20th January 2011, 04:44 #3
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    Quote Originally Posted by scalerobotics View Post
    Yes, remove power from the PIC

    Once you start a pwm software based pwm, it will complete before it moves on.
    Thats what I thought. I guess I will use HPWM.

    Thanks,
  4. - 20th January 2011, 12:52 #4
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    Objection ...

    an asm interrupt can stop it ... but with an external action ! ( also possible with a timer ... but what the real use ? )

    Alain
    Last edited by Acetronics2; - 20th January 2011 at 12:56.
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  5. - 21st January 2011, 00:14 #5
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    Quote Originally Posted by Acetronics View Post
    Objection ...

    an asm interrupt can stop it ... but with an external action ! ( also possible with a timer ... but what the real use ? )

    Alain
    Hi Acetronics,

    I want to output a pulse train to a stepper driver controller to turn a rotary table. If I make a mistake in entry or part way through the router cut I want to stop it. I realize I can just turn it off but wanted something different.

    Thanks, Don
  6. - 21st January 2011, 05:30 #6
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    Timmer interrupt, HPWM would work. A huge "safety Break" button in serie is never a bad idea in case the driver goes nuts. Current read from the motor, feed into the pic and all plah plah is also a nice extra... Even better if you keep track of every "events" around...

    Originally Posted by Acetronics
    Objection ...
    - Objection acceptée
    - Merci votre honneur
    Steve

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