On 11/20/2012 11:40 AM, Anders Wallin wrote: > Good news! > I've ordered a Pi (Farnell re-directs to a local distributor), but the > delivery-time seems to be 3 weeks right now(?)
Good luck with that! Some six months ago I ordered an original (256MB) Series-B RPi from Allied Electronics here in the USA. It went out-of-stock there even as I was pressing the "commit" button. Two months later, I happened to catch Newark (now tied together with Farnell) showing them in stock and snagged one before they also depleted their stock on hand. Since that time everyone over here has been showing this same 3-week lead time. I suppose that means there is a container full of 512MB boards somewhere on the high seas. > It seems that the SPI interface will be most useful for high-speed IO. If I > understood correctly the Pi supports only two separate chips on the > SPI-bus, but on IRC PCW mentioned that SPI is possible on the GPIO-pins > also? For a servo-controlled machine I guess a microcontroller and/or FPGA > on the SPI bus could read encoders, output PWM, and do IO. One would then > need a HAL-driver that is capable of communicating the relevant data over > SPI every servo period (1ms or so). Do you think this HAL2SPI driver will > be easy or hard to write? > What about stepper-machines? Is it enough to communicate a stepper velocity > over SPI to dedicated step-generation hardware? I'm not a driver guy. I'm hoping that technical need or just good old-fashioned curiosity is motivating other folks to "git er" done RSN (Real Soon Now). > > In addition to cnc use I'm also interested in stand-alone operation with a > touch-screen, for example this one (HDMI display, USB touchscreen): > http://www.lilliputuk.com/monitors/open-frame/of701-2/ > > Something that boots directly into a Touchy-like custom UI-panel and can > set/watch/plot/etc. HAL-signals would be really nice. This goal doesn't seem out of reach. I started on a similar project based on hacking an ARM-based Insignia (house brand of the BestBuy chain here in the USA) Infocast 7" touchscreen internet appliance. I seemed to be making progress, but it was strictly as a satellite Touchy talking via ethernet to a LinuxCNC machine. Family health problems have slowed me down considerably. Regards, Kent PS - Have you seen the Eaton HMi VU Operator Interface (http://www.alliedelec.com/lp/121120eaton/?utm_source=product&utm_medium=email&utm_campaign=121120_product). It's too pricey for my blood but interesting in that it is basically an encapsulation of many of the features we talk about. ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
