>-----Original Message-----
>From: Omer YALHI [mailto:oyalhi@TEKSAN.COM.TR]
>
>Hi, I am sorry to barge in but, how would you handle the short
>press and long press with this?  I could not figure out the
>inc_value's purpose.
>
>I am really asking, as I am also struggling with this idea.
>Also, I am trying to figure out a way to handle two or three
>button presses.
>
>Thanks,
>
>Omer

The idea is that this routine is called regularly, and the inc_value
variable automaticaly holds a value that can be used to increase whatever
parameter you wish in your main code.  You could increase the number of
buttons serviced relatively easily:

void timerInterrupt(void)
{
    // get current button(s) pressed e.g. read a PORT
    buttons = GetButtons();

    // is at least one button pressed and
    // is it the same button(s) pressed as last time?
    // may want to check for ony one button pressed here!
    if( buttons && (buttons == prev_buttons) )
        {
        // same buttons pressed, increment button_time
        // unless maximum value already reached
        if(button_time < MAX_BUTTON_TIME)
            button_time++;
        }
    else
        {
        // no buttons or different buttons pressed
        button_time = 0;
        }

    // set inc_value depending on how long button has
    // been held down
    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;

    // save current buttons for next comparision
    prev_buttons = buttons;
}


Main
{
    while(1)
        {
        if(buttons & BUTTON_1_MASK)
            Parameter1 += inc_value;

        if(buttons & BUTTON_2_MASK)
            Parameter2 += inc_value;

        if(buttons & BUTTON_3_MASK)
            Parameter3 += inc_value;

        etc...
        }
}

HTH

Mike




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