John Kasunich wrote: > Jon Elson wrote: > > >> Even getting 200 KHz output with complex code is very unlikely. You >> would need to set the interrupt frequency to 200 KHz = 50 us, >> > > 200KHz interrupts is a 5uS period, not 50uS. Not happening on any PC. > I think Alex Joni once got the period down to about 6.5uS, just to see > how far he could go. The machine was not very usable at that point. > > OOPs, off by an order of magnitude! Yes, getting interrupts down much below 15 us, even on multi-core CPUs, is just about impossible.
Sorry for the mistake. So, software-generated step pulses up to 50 KHz or so is possible on some programs, but already pushing things pretty far. Mach has some tricks to handle pulses between interrupts and can go a bit higher. Eventually, the high-end CPU needed to do this costs more than some of the hardware assist devices available. 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
