It looks like it is time to start throwing together some breakout code in experimental repositories (github or bitbucket maybe) for L3. What I am talking about is sketches which are intended to be thrown away later and used to inform the new version 3 design.
On Nov 20 2012 12:54 PM, Michael Haberler wrote: > I dont want to curb your hopes too much, but I said 'GladeVCP+HAL > standalone applications' and meant to say 'HAL only' - i.e. no Gcode, > no task, no motion - more loudly > > that works and I can recommend looking into especially if the > application isnt very time critical (I get something like 45uS > latency > on the Pi with xenomai) > > I do use the Pi as an exemplary platform to test configure and build; > I dont expect to use it for CNC purposes myself and I'm not investing > effort > > dont waste too much time on seeing a Pi as €35 CNC platform just yet > - it's pushing the limits (gut feeling, without having tried I'd say > this is outside the Pi's capabilities, and the I/O interfacing > capabilities arent that plush) > > I'd rather look into a BeagleBone or so for real I/O; still soft > stepping is a bit meager on ARM's without resorting to tricks like > Sergey did in miniemc2 - which is btw worth picking up, but not > necessarily by me ;) in case of the BeagleBone it would mean 'program > the RT hard stuff in the extra 'realtime RISC cores' which doesnt > look > like a weekend project either > > -m > > > > Am 20.11.2012 um 17:40 schrieb Anders Wallin: > >> 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
