Re: [uCsimm] Servo Control

From: Howard Hart (
Date: Mon Feb 12 2001 - 13:47:57 EST

Never tried using the PWM port for servo control, but I have used PWM over Parallel
ports to
control helicopter servos on a Motorola HC11 eval board. Pretty straightforward and
the drivers should
already be there with the uCLinux kernel--just have to enable them. Drop me a line if
there's interest.

Howard Hart
ipDialog, Inc.

"D. Jeff Dionne" wrote:

> The uCsimm provides no code to drive the PWM, but it is avaialble on the
> connector. You need to program it youself, and a good place to start is
> the chapter on PWM in the 68EZ328 manual. A copy of the manual in PDF
> form is in the Datasheets directory on the CD. Have a look there, and if
> you need more perhaps we can dig up an application note.
> In order to control a servo closed loop (as opposed to just crude open
> loop output) you'll need to code up a PID loop or a fuzzy logic engine.
> The Dragonball has obviously enough oomph to do this...
> J
> On Mon, 12 Feb 2001, Frederick Hopke wrote:
> > Forgive me I'm new to linux in general and also have I'm a MechE and thus
> > this isn't entirely my field of expertise. Anyway... I've been given the
> > task of figuring out how to use our new and groovy uCsimm to do the
> > following tasks:
> >
> > a) Control a Servo
> > b) Run a quickcam
> >
> > the second isn't nearly as important as the first. Now I understand the
> > basic concept of using PWM to control the Servo, but for the life of me I
> > can't make heads or tails of the documentation concerning it's use on the
> > uCsimm... Has anyone out there done this and can they offer some pointers?
> > Any help would be appreciated :)
> >
> > -Fred
> >
> > -----------------
> > Frederick K. Hopke
> >
> > Student Software Assistant, CMU Computing Services
> > Undergraduate Research Assistant, I-Cubes project
> > Buggy Chair/Secretary/Treasurer, W3VC-
> > Club Station of the Carnegie Tech Radio Club
> > This message resent by the list server
> >
> This message resent by the list server

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