Matthew Glenn Shaver wrote:
> On Mon, 2007-03-19 at 08:04 -0500, Stuart Stevenson wrote:
>> I would end up with a control display for every operator. How fun
>> would that be?
>
> A lot of fun! ;)
>
> ************************
> ;Jog wheel algorithm
>
> ;Initial state
> accumulated_clicks = jog_wheel_position
> direction = 0
>
> while (jog_wheel_enabled) {
>
> if (jog_wheel_position != accumulated_clicks) {
>
> ;start moving
> if (jog_wheel_position > accumulated_clicks) {
> commanded_position++
> direction = 1
> } else {
> commanded_position--
> direction = -1
> }
>
> ;ignore further clicking in the same direction
> ;while axis is not in deceleration
> while (!selected_jog_axis_decelerating) {
> if (
> (jog_wheel_position > accumulated_clicks && direction = -1)
> ||
> (jog_wheel_position < accumulated_clicks && direction = 1)
> ) {
> next
> }
> accumulated_clicks = jog_wheel_position
> };while not in decel
>
> };if jwp != ac
>
> };while(1)
> ************************
>
> I thought this was going to be more complex, but I guess this is how I
> think it should work. It kind of mimics how we accelerate & brake a car;
> a bangbang velocity controller with human reaction time hysteresis.
>
> Your thoughts?
>
> Matt
The more I think about this, the more I like the "timeout" approach.
Think in terms of the "either wind up a spring, or slip" choice that I
mentioned elsewhere in this thread. The timeout method waits until the
last possible instant before it "slips". When you are turning, even if
you turn too fast, it never discards a click. It always "winds up the
spring". Only after you have stopped turning the wheel does it say "its
taking too long to unwind the spring, stop (slip) now (and lose position)".
Regards,
John Kasunich
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