Re: stepper pulse rate idea

[Jon Elson <elson-at-pico-systems.com>]

alex wrote:

>I think that the best way around it is to network EMC postprocessor to
>DOS module which would work in real time, with encoder feedback.
>If loop length limit for RT LINUX is 1ms, for DOS it can be easy .1 ms,
>or less. Heck, it can be done in assembler even!
>Technically it is quite easy to do as well - just requires recompiling some
>modules for DOS.
>  
>
Stepper timing in software on EMC is already done at somewhere between 
50 uS and
16 uS, faster if your CPU can handle the interrupts.  So, there is NO 
advantage if
adding another CPU and CPU-CPU communications overhead to get faster 
interrupts.

1 mS is adequate for servo motion control systems, there's no NEED to go 
faster in
most systems.  That's why we get excellent performance on 100 MHz 
Pentium classic
CPUs.

Jon