>-----Original Message-----
>From: llile@SALTONUSA.COM [mailto:llile@SALTONUSA.COM]
>
>I am a big fan of the two button up-down "slew" control for a lot of
>interfaces:  People understand it well, it is simple to use
>and simple to implement
>
>I have done the parabolic control two different ways. Both are
>pretty ugly, IMHO.  One is wtoo complex, the other has a long
>busy state where the processor is tied up.
>
>1st way was to have a periodic interrupt that polls the switches.  Some
>
>Another time I did this without interrupts by reducing the
>amount of time I ignored a button press, no interrupts:

How about something like:


void Interrupt(void)
{
        if(button == PRESSED)
                {
                if(button_time < MAX_BUTTON_TIME)
                        button_time++;
                }
        else
                {
                button_time = 0;
                }

        if(button_time < DEBOUNCE_TIME)
                inc_value = 0;
        else if(button_time < SLOW_INC_TIME)
                inc_value = SLOW_INC_VALUE;
        else
                inc_value = FAST_INC_VALUE;

}

You then have an automagicaly increasing value in inc_value to be used where
ever it is required in your main loop.  The number of increments is easily
increased, and you have debouncing built in.


Regards

Mike




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