On 30 October 2017 at 08:22, Chris Albertson <albertson.ch...@gmail.com> wrote:
> I think the current trend in the industry is to move the control loops > closer to the motors ... > In fact I can by a STM32F on a PCB for less than the price of a good power > cable. ... > What I'm looking into is a distributed system with computing pushed closer > to where it is used. You could look at STMBL.It's an STM32-based servo drive. Communication with the LinuxCNC system is by CAT5 cables carrying the Mesa Smart-Serial protocol. (quadrature and step/dir also supported) With the smart-serial interface you plug it in to LinuxCNC and HAL pins magically appear with names like "stmbl.ABCD.position-command". (I think that you currently need a Mesa card to transmit the signals, though the Mesa firmware is open-source and some people have made their own hardware for that end too) It still relies on realtime at the LinuxCNC end, but as has been commented earlier, all the axis positions get sent simultaneously in the same packet even if there is jitter between the packets. STMBL firware and hardware are both open-source. In fact as far as I know the only way to get one is to make your own. (I have one, but I was given it to do some HAL driver testing) https://github.com/rene-dev/stmbl Scroll down past the file listing to find words and pictures. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
