On 08/12/2015 07:43 AM, andy pugh wrote: > On 12 August 2015 at 13:36, Gene Heskett <[email protected]> wrote: >> This is a case where a hardware stepgen might be needed as software only >> has a limit in output step frequency on the x86 driven pc of 40Khz that >> is largely removed by the use of something like a mesa 5i25 card. > The Beaglebone has a PRU (and a Machinekit driver) that can achieve > similar step rates to the FPGA cards. > Well, no, not quite true, as a blanket statement. However, the PRU can definitely achieve step rates that are needed by most practical microstepping systems. If you use a drive with insane (1000X) microstepping, or a servo drive that is commanded by step pulses, then the PRU may not be able to provide fast enough steps to reach the top speed. But, for Gecko drives and similar, yes, the PRU is plenty fast enough.
Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
