I''m planning on using a ft2232H for a stepper setup, since it does buffering and clocking to spi ... Everyone is so negative to usb but you can have 'synchronous transfer' with limited bandwith but guaranteed transfer, so actual data looks quite positive.
Check these links, linux realtime and real time device drivers. https://www.osadl.org/Migration-Portability.migration-portability.0.html#c1006 https://www.osadl.org/RTDM-native.howto-rtdm-native.0.html Using a microcontroller for fx. servo loop, and just data through USB changes the game, latency for the feedback to computer but acceptable. / regards, Lars Segerlund. 2011/6/15 Topi Rinkinen <[email protected]>: > Hi, > > I've been studying different DIY-CNC options for about a year now, and I > feel that LinuxCNC is in pretty good shape to play with (have not played > with it, though). > > I am a professional FPGA designer, and I would like to contribute to EMC > if FPGA-design is needed. > > I feel that adding support for the following "IO-card", better > performance and scalability could be achieved: > http://www.latticesemi.com/products/developmenthardware/developmentkits/machxo2picokit.cfm > is evaluation card for Lattice's brand new CPLD/FPGA. And the best part > for real-time system is FT2232H > http://www.ftdichip.com/Products/ICs/FT2232H.htm > chip, which can be utilized to transfer upto 40 Mbytes/second to the HW. > > The price of DevKit is only $29, which is a third compared to > MORPH-IC-II > http://www.ftdichip.com/Products/Modules/DevelopmentModules.htm > (Which also could be used for EMC) > > How do you feel, could the USB+FPGA based IO expansion be utilized in > EMC? Which kind of functionality should be embedded there? > > What constraints should I recognize? > > Other thoughts? > > BR, -Topi > > > ------------------------------------------------------------------------------ > EditLive Enterprise is the world's most technically advanced content > authoring tool. Experience the power of Track Changes, Inline Image > Editing and ensure content is compliant with Accessibility Checking. > http://p.sf.net/sfu/ephox-dev2dev > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
