On 08/12/2011 02:10 PM, andy pugh wrote: > This is a simplification. Address auto-indexing and translation ram > (where contguous memory addresses link to non-contiguous registers) > confuse the matter. > > Why are you asking?
This is a simplification. Address auto-indexing and translation ram (where contguous memory addresses link to non-contiguous registers) confuse the matter. Why are you asking? I have a seminal idea I'm trying to reason out (or away.) A while ago there was a thread here about interfacing to an ARM micro-controller on the parallel port. I expected EMC2 to read position data for 4 or 5 axes from the P-port, read homing and limit switch states, do some calculations with the data, and then send velocity information for 5 axes back to the P-port. I'm thinking about a stepper system that would use existing P-port messages and act like a servo system to EMC2, but cost a lot less than a real servo system. I was hoping EMC2 would ask for information, and get back a series of bytes that covers all it needs to know, then do multiple writes in a clump; so the micro-controller wouldn't have to drop everything for long. Address-data address-data address-data seems like a lot of overhead. I'd just hate to have to write a new interface for a micro-controller. More work. Of course I'll probably never get to implementing any of this, but I like to dream. I'm definitely an idea hamster. ------------------------------------------------------------------------------ FREE DOWNLOAD - uberSVN with Social Coding for Subversion. Subversion made easy with a complete admin console. Easy to use, easy to manage, easy to install, easy to extend. Get a Free download of the new open ALM Subversion platform now. http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
