On 10/11/2013 5:22 AM, andy pugh wrote: > > I don't think an EPP interface out of the BBB and into the 7i43 makes > much sense. The 7i43 takes commands from the EPP and produces step/dir > and/or PWM and/or GPIO signals from that. > This means that a BBB to EPP interface would probably be using the PRU > to prestend to be an EPP parallel port to tell a 7i43 to do exactly > what the PRU _already_does_ .
The point is not to use the 7i43 for step/dir generation, but for true servos with encoder feedback. This is _maybe_ possible using just the BBB and the PRU, but using something like the 7i43 means a lot less development work. I agree if you're just doing step outputs, the BBB with the PRU can deal with that just fine. IMHO, the "maker-space" progression is: AVR based Arduino for simple machines BBB with PRU step/dir generation for stand-alone machines with support for complex kinematics and full LinuxCNC "goodness" BBB with 7i43 for servo systems with encoder feedback, or dangerous machines that need real hardware protection -- Charles Steinkuehler [email protected] ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134071&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
