Mario. wrote: > Many cheap mainboards with integrated CPUs do 100k interrupts per > second (100k steps per second in quadrature outputs) pretty well. > We need to see the difference betwee the step/dir output and clean, > fast quadrature output as step/dir output can reach at most 50% of the > output step speed of the quadrature output. > > Well, the difference is with the EMC2 scheme and software-generated steps, with a 10 us base_period, you have a 100% step resolution. Either 10 us or 20 us between steps. There is no timing in between these two. So, if you needed 75 KHz, the software would alternately send pulses at 10 and 20 us intervals.
With my Universal Stepper Controller, for instance, which has a 10 MHz clock on the step counters, you still have a ONE PERCENT resolution at 100 KHz. You can output a perfectly even train of pulses at 99010 or 101010 Hz (the next steps in frequency in my scheme). Jon ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
