William,

It's preemptive. All you need to do is give the thread higher priority.

It isn't a simple matter to expose the lower level servo PWM control.
The eight servos are multiplexed off of a single output, which makes it
tightly coupled to the hardware.

Regards,

RidgeSoft Support


--- In intellibrain@yahoogroups.com, "William J. Rust" <wjr@...> wrote:
>
> I tried using Servo directly and it didn't work. However, using a
pulse
> output port does work. I got the motors to turn both ways. I should
know
> this but is the threading preemptive or will I need to put in yields
to
> make sure the motors keep running?
>
> BTW, when I decompiled the jar, I notice the servos are native calls.
> Any chance that the parameters to the PWM call are, or could be,
public?
>
> Thanks,
>
> wjr
>
> RidgeSoft wrote:
> >
> >
> > Hi William,
> >
> > You might try using the Servo interface directly, rather than the
> > ContinuousRotationServo facade. This will allow you to experiment
with
> > various pulse widths to see how the ESC responds. Another option is
to
> > use one of the pulse output ports. These have more flexibility in
terms
> > of pulse duration and frequency. To create a pulse train similar to
> > what the servo ports do, you would have to have a high priority
thread
> > wake up every so often to fire a pulse on the port.
> >
> > Regards,
> >
> > RidgeSoft Support
> >
> > --- In intellibrain@yahoogroups.com
> > <mailto:intellibrain%40yahoogroups.com>, "William J. Rust" wjr@
> > wrote:
> > >
> > > Hi,
> > >
> > > I've finally gotten back to using my IB to control a TA RC car.
The
> > > problem that I am having is that it won't go into reverse. When I
use
> > > the RC controller, I have to flip it into reverse twice before it
> > > actually takes but I believe that to be an artifact of the
controller
> > > instead of the esc. In any case, I recently got a javelin stamp
and
> > used
> > > its servo port to make it go both forward and reverse. When I
hooked
> > up
> > > both the IB and the JS to a 'sillicope, I found that the IB has a
> > > slightly shorter period than the JS. This might mean that the esc
sees
> > > the pulse as being longer than it really is. When I shortened the
> > pulse
> > > times on the JS, it acted just like the IB does, not going into
> > reverse.
> > > The JS gives you really nuts and bolts access to the servo pwm. Is
> > there
> > > somewhere in the servo code that lets you do the same thing?
> > >
> > > Thanks,
> > >
> > > wjr
> > >
> > > --
> > > William J. Rust, PhD
> > >
> >
> >
>
>
> --
> William J. Rust, PhD
>