Karl Schmidt wrote: > > In my mind, a single chip uP system, with just a small assembly program, > could do the pulse > generation busy work and make the position information available to the > PC-system with time left > over to play an audio stream. The question is if there is going to be a > latency issue of bringing > that position information back into the PC without any problematic latency - > ( the outer loop is > running much slower - so I doubt there is an issue. ) > Yes, and an FPGA can do all that, with much better timing accuracy, and for all axes in parallel. All of this has already been done. I was working with the Beagle Board a couple years ago and built an adaptor to connect one to my univeral stepper/PWM controllers, but was stopped by the lack of an RT kernel. I sent a Beagle Board to the ARM maintainer for RTAI and hoped it would only take him a month or two to bring the ARM version of RTAI up to date, but it hasn't happened.
I'm guessing the preempt kernel might be OK for hardware-assisted motion systems, but probably not for software-generated stepping. If somebody wants to try to build a driver for the ARM on-chip peripherals that would be very interesting. Jon ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
