Re: [CAD_CAM_EDM_DRO] Re: PC to controller comunication protocols

Hi Phil,

"Bresenham elliptical algorithm" ? To draw ellipses? That could be
useful. I had thought about adding an ellipse command to my CNC
controller program.

Try one of the new PICs? 18F, 30F, all getting pretty fast with FP in C.

Alan KM6VV

Yahoo wrote:

>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
>