Andy Pugh pravi: > On 14 March 2010 19:49, Slavko Kocjancic <[email protected]> wrote: > > >> I have one parallel port on my laptop computer. Here is no way to put >> another one. So I just wonder if someone was already try to use-make EPP >> port expander. >> > > The Mesa 7i43 does so much more than a simple expander that at $75 it > seems a more rational choice, I would have thought. (48 IO pins, > on-board pwmgen, stepgen and encoder tracking). > Also, unlike your proposed multiplexer, it is already supported by EMC2 > > If all you want is to add a couple of pins, then you can play around > with binary patterns rather than individual pins, I did this with > relays to make 2 IO lines on the P-Port handle > off/mill-clockwise/lathe-clockwise/lathe-anticlockwise > > There are HAL components that can be used to demux the patterns into > individual signals (or vice-versa) if you can figure out a way to > handle the hardware side. > > *Maybe you right. ... but that's just to much for job I needed.
But if you just want to control 4 steppers with 3 phase output you need 12 output lines. That can be done with normal printer port. ... but lack of input lines. Just see that schematics.. http://tinyurl.com/ycp738r It use simple decoder to make 16 output and 16 input lines out of EPP port. And none of special chips. All components together are under 5 Euro!. And driver for that shouldn't be hard to write. * ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
