HPWM confusion


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Thread: HPWM confusion

  1. #1
    Join Date
    Oct 2004
    Location
    New Hampshire
    Posts
    76

    Red face HPWM confusion

    Ok... please forgive. I've read the posts. I've seen the code and still I just don't get it.

    Using the PWM command requires the output pin, the duty, and the cycle... cycle being the length of time that it is running right?

    So:

    pwm portb.1,127,200 '4mhz clock

    would produce pulses on portb.1 at an approximate 50% duty cycle for 1 second right? Then you'd bounce to the next line of code.

    When you use HPWM, it runs in the background until it is stopped. So why do you need to put a cycle time? Doesn't it just run until you tell it not to?

    I know this is simple but my brain just won't allow entrance!!!

    Thanks for holding my hand!

    Ross
    Never enough knowledge to be called intelligent but just enough knowledge to be considered dangerous!

    I like that! :-)

  2. #2

    Default

    Ross, there isn't a cycle in the HPWM command.

    HPWM Channel,Dutycycle,Frequency

    Channel is the output you want to use.

    Dutycycle is the on/off ratio.

    Frequency is how many times it does it per second.

  3. #3
    Join Date
    Oct 2004
    Location
    New Hampshire
    Posts
    76

    Default Pros and Cons of Frequency used with HPWM

    Thanks CocaColaKid,

    That helps a lot.

    How is a frequency chosen for a given application? I suspect it will depend on what is being driven.

    Can someone give pros and cons of high and low frequencies for the HPWM command? Rules of thumb? Anybody?

    Thanks,

    Ross
    Never enough knowledge to be called intelligent but just enough knowledge to be considered dangerous!

    I like that! :-)

  4. #4

    Default

    That's a good question. I'm not really sure, I usually just use 1kHz.

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