On Sun, Feb 27, 2011 at 06:56:18AM -0500, Mark Wendt (Contractor) wrote: > On 2/26/2011 3:35 PM, cogoman wrote: > > Sounds like the NGX BlueBoard-LPC1768-H might be all the hardware you'd > > need. > > > > http://shop.ngxtechnologies.com/product_info.php?cPath=21&products_id=65 > > <http://shop.ngxtechnologies.com/product_info.php?cPath=21&products_id=65> > > Hmmm, wonder if that board could be programmed to be a real time > ethernet slave?
Yup, especially if an open-source copy of the protocol stack is to hand. There's no copyright message in EMAC.c, the ethernet packet-driver downloadable from the site, so I don't know its status. If OK, it could form a basis for UDP communication with an EMC2 host. Given no other traffic on the cable, it wouldn't be hard to keep that RT from the slave end. (There's tcpip software there, but we'd want UDP.) The board is only a breakout board for the CPU, but that's worth something, because 0.25mm wide pins at 0.5mm spacing are a bit tricky to hand solder. (Too easy to misalign or bend, for one thing.) I notice that 50% of the "reviews", and the marketing page warn that the soldering on the board is crap. Some rework with a soldering iron needs to be added to the cost. Yes, it's cheap, and very convenient for experimenting, but hard limit switches and charge pump would be doubly mandatory with something so inherently unreliable, I expect. If the community decided to go with this, I'd buy a couple, and arc up the gnu toolchain for this target, just for the fun of playing with ARM. These chips have one quadrature encoder input. At 100 MHz, and with hardware counters, I'd figure we could handle a couple. However, I'm much more familiar with AVR (Atmel), have the toolchain up to working temperature, and can fix problems more quickly there. There are AVR-based ehternet card, including ethernut 1.3: http://www.egnite.de/egnite-shop/ethernut-13/ethernut-bulk-13h.html Click on "Technische Daten". (Sorry, I don't see an English link. It's surely there somewhere.) There's an open-source project at: http://www.ethernut.de/ At least that 4-layer board won't need rework before it can be used. Erik -- Meskimen's Law: There's never time to do it right, but always time to do it over. ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
