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(?)
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? 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. Anders On Tue, Nov 20, 2012 at 4:47 PM, Michael Haberler <mai...@mah.priv.at>wrote: > I just verified this combination works, for the standard Raspberry > Raspbian kernel 3.2.27+ with Posix threads (aka 'simulator'), and with > Xenomai 3.2.21 for somewhat better performance > > both remote X Display and local console work > > this is the rtos-integration-preview1 branch; the only part needed > disabling was the GladeVCP sourceview widget which is lacking the > underlying modules > > currently the only hardware driver supported is hal_gpio for wiggling some > pins; the serial, i2c and SPI interfaces would be possible further > candidates, mungkie did some initial work on these > > > I'll see whether I can come up with an SD card image ready to go with all > the parts (xenomai + userland support + linuxcnc prerequisites + linuxcnc > built) > > Axis, touchy and friends are still untested > > > - Michael > > > ------------------------------------------------------------------------------ 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
