Re: PC to controller comunication protocols

I figured a way to modify the Bresenham eliptical algorithm to implement
circular arcs using only add and subtract operations (provided the axes both
have the same step sizes) but found in early testing that even for
straight-line pulse generation the maximum pulse rate is severely limited by
the power of the 8-bit PIC micros. I can generate trapezoidal acceleration
profiles up to 50 KHz on a 20 MHz 8-bit PIC if little other processing is
required, but any complexity in the program quickly cuts that in half. I'm
considering solutions using multiple PIC micros because they're so cheap. As
always, the internal debate is whether it would be worth the effort.
--
Phil Mattison
http://www.ohmikron.com/
Motors::Drivers::Controllers::Software

----- Original Message -----
From: dgoadby <david@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, February 27, 2008 6:54 AM
Subject: [CAD_CAM_EDM_DRO] Re: PC to controller comunication protocols
>
...
>
> My project started with a PC then I tried one of the larger PICs but,
> like you have discovered, the floating point becomes a problem once
> you leave simple G Codes, so it's back to a PC again.
>
...
>
> Regards
>
> David
>
>