#linuxcnc-devel | Logs for 2014-06-04

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[00:12:36] <skunkworks_> cradek: is the weather effecting you guys?
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[01:57:18] <cradek> skunkworks_: not yet, but looks like we're about to get hit
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[01:59:31] <seb_kuzminsky> stock up on whiskey & ammunition
[02:00:22] <cradek> do people still hoard gasoline, or is it just ammo now?
[02:01:01] <Tom_itx> i remember a few years ago they were lined up at the pump with anything that would hold gas
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[02:19:39] <cradek> woo
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[02:22:11] <Tom_itx> then the shortage never occurred
[02:25:27] <cradek> I guess ammo gets you gasoline if you need it
[02:25:58] <cradek> http://www.theonion.com/articles/gun-pays-for-itself-on-first-day,9511/
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[02:29:57] <Tom_itx> those are awfully clean bills
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[02:31:37] <Tom_itx> does this link still work? i've been working on my router a bit... http://tom-itx.no-ip.biz:81/~webpage/emc/xilinx/xilinx14_install_index.php
[02:34:05] <pcw_home> Yes, there was a forum entry with an stale link but I updated it
[02:34:29] <Tom_itx> dyndns dropped their free service
[02:34:37] <pcw_home> Ahh
[02:34:45] <Tom_itx> and i'm cheap
[02:35:17] <pcw_home> I appreciate that you took the trouble to set that up and host it
[02:35:44] <Tom_itx> the least i could do
[02:35:58] <Tom_itx> i've gotten more than my share of help
[02:36:50] <Tom_itx> just wish i were better at custom router setups
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[02:41:23] <pcw_home> My sysadmin skills consist of praying that things dont break
[02:42:20] <Tom_itx> i'm trying to add a video DVR
[02:42:57] <Tom_itx> all the inbound requests were being routed to the server though so i had to reconfigure all that first
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[03:01:11] <Tom_itx> errie storm pics from tonight: http://kake.mycapture.com/mycapture/photos/Album.aspx?EventID=821749&CategoryID=46169
[03:05:47] <pcw_home> Kinda scary looking
[03:05:57] <Tom_itx> aliens
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[14:56:07] <mozmck> Interesting article on memory requirements of various desktop environments. http://flexion.org/posts/2014-03-memory-consumption-of-linux-desktop-environments.html
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[15:35:27] <mozmck> hahaha! I don't quite know what he's saying but googles translate makes it sound funny: "...but I think that'll be it bang on the head only while it is "crack"." http://www.linuxcnc.org/index.php/english/forum/49-basic-configuration/27900-thc-config-that-works#47677
[15:36:08] <mozmck> google's translation that is... maybe I need to use it :)
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[15:38:16] <pcw_home> I was trying to figure that one out myself
[15:40:46] <mozmck> Sounds like he's saying Mach4 is a commercial gimmick that is not that good. Maybe the rest is that it will be knocked out (banged on the head) while it is new? soon?
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[15:47:55] <pcw_home> maybe...
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[16:08:14] <cradek> settings->cycle_i = -block->p_number;
[16:08:14] <cradek> settings->cycle_j = -block->q_number;
[16:08:17] <cradek> this is cool
[16:08:45] <cradek> with G5 if you don't specify the new IJ you get smoothness with the previous cubic spline
[16:09:31] <cradek> this is very nice functionality -- unfortunately all the documentation is written in C
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[16:25:03] <pcw_home> The X and Y are control points and I/J are offsets?
[16:25:13] <pcw_home> (g5.1)
[16:25:58] <cradek> with G5.1, XY are the endpoint. IJ are incremental from start point to the (single) control point
[16:26:26] <cradek> G5.1 is quadratic (one control point)
[16:26:33] <pcw_home> Ahh
[16:27:52] <cradek> truetype-tracer generates G5.1 codes because truetype uses quadratic curves
[16:28:12] <pcw_home> so just like a normal motion gcode
[16:28:35] <pcw_home> never really looked at them
[16:28:51] <cradek> yes our G5.1 is no more weird than G2/3
[16:29:22] <cradek> they'll see more use if they're in the docs and gcode quickref (I'm working on it)
[16:29:41] <cradek> kind of need pictures though. I'm not sure how to draw them.
[16:29:51] <pcw_home> yeah the quick referece is a bit too quick
[16:30:04] <cradek> well each thing on it is a link to the full docs
[16:30:14] <cradek> the full docs should have the pictures
[16:30:29] <cradek> the quickref is my favorite piece of our documentation
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[16:31:50] <pcw_home> I see a link on the NURBS gcode but not g5.1 maybe I'm looking at old docs
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[16:36:25] <cradek> http://timeguy.com/cradek-files/emc/g5.1.png
[16:36:37] <cradek> possibly clear as mud
[16:39:38] <pcw_home> The example is a great addition
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[16:40:15] <cradek> it's easy to think of most obvious quadratic. not sure what example to use for a cubic.
[16:40:42] <cradek> we don't have ANY docs for G5 (cubic) yet
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[16:44:46] <pcw_home> It seems those would be most useful if CAM programs would generate them
[16:44:57] <cradek> yeah clearly
[16:45:43] <pcw_home> https://www.mail-archive.com/emc-developers@lists.sourceforge.net/msg10415.html
[16:45:44] <cradek> truetype-tracer is a good example of how they can be useful and they make the gcode simpler
[16:46:02] <cradek> postscript/type1 fonts are made of cubics
[16:48:55] <cradek> pcw_home: that is not the implementation we currently have
[16:48:56] <pcw_home> I didnt realize that truetype-tracer makes use of G5.1, thats neat
[16:49:14] <cradek> unfortunately nobody picked that up
[16:50:12] <cradek> pcw_home: G5.1 for truetype and G5.2 for type1 (truetype-tracer also can do type1 fonts)
[16:50:31] <cradek> so ... the name isn't perfect anymore
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[19:04:28] <KGB-linuxcnc> 03Chris Radek 05v2.5_branch e137bd0 06linuxcnc 10docs/html/gcode.html 10docs/src/gcode/gcode.txt Document G5, G5.1, G5.2, G5.3 NURBS/spline commands * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=e137bd0
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[19:05:55] <skunkworks> nice!
[19:06:56] <cradek> we'll see if I get all the linking stuff right
[19:07:08] <cradek> quickref, anchors, etc
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[19:07:19] <cradek> I think the buildbot docs end up on www.linuxcnc.org?
[19:07:52] <skunkworks> you talking about http://www.linuxcnc.org/docs/
[19:07:56] <cradek> yes
[19:07:56] <skunkworks> ?
[19:08:05] <skunkworks> then yes :)
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[19:27:48] <cradek> that's awesome
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[20:07:57] <CaptHindsight> has anyone tried toggling the GPIO on the headers of AMD boards to see if they may be used to replace LPT?
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[20:32:26] <mozmck> CaptHindsight: what are some boards with this feature?
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[20:36:47] <CaptHindsight> http://www.jetwaycomputer.com/NF82.html only 8 GPIO but the actual drivers on the pins are fast enough for PCIe and SATA control signals
[20:37:31] <CaptHindsight> I have the NDA docs and they can be configured as IO in user space
[20:37:43] <mozmck> http://lkml.iu.edu/hypermail/linux/kernel/0902.2/02547.html
[20:37:50] <mozmck> interesting.
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[20:38:39] <CaptHindsight> there are actually many GPIO pins that are muxed but the 8 have become semi-standard on several APU boards
[20:39:25] <CaptHindsight> from the embedded vendors like Jetway, axiomtek etc
[20:39:27] <mozmck> Looks like there is a driver in the linux kernel for them as well, but I don't know if that could be used for realtime output.
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[20:39:54] <mozmck> Are those APUs pretty good?
[20:40:08] <CaptHindsight> I've been using them for the past few years
[20:40:18] <mozmck> With linuxcnc?
[20:40:22] <CaptHindsight> 10uS jitter
[20:40:29] <CaptHindsight> yes
[20:40:29] <mozmck> interesting
[20:42:14] <CaptHindsight> as far as real time goes the registers are there in user space, the hardware has fast drivers
[20:43:44] <CaptHindsight> they are muxed with other high speed signals, so if BIOS configures them and the board has the headers they are there
[20:46:32] <CaptHindsight> I could make my own board and bring out all the unused GPIO to headers
[20:46:47] <mozmck> How many can you get?
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[20:46:53] <mozmck> gpio that is.
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[20:47:19] <cradek> I got it right!
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[20:58:29] <CaptHindsight> mozmck: there are ~230 muxed, so if you leave out things like VGA you could end up with quite a few, maybe 32 or more
[20:58:44] <CaptHindsight> I'll have to look at the docs again
[20:59:08] <cradek> pcw_home: I'd be interested to know whether you can make sense of the new spline/NURBS docs
[20:59:16] <cradek> http://linuxcnc.org/docs/2.5/html/gcode.html
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[21:02:00] <CaptHindsight> mozmck: looks like 24 are GPIO handled by GEvent pins
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[21:12:01] <CaptHindsight> mozmck: ftp://kolibrios.org/users/art_zh/doc/public/A50_RRG.pdf an open version of the docs. Starts at page 251
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[21:16:24] <mozmck> thanks!
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[21:22:21] <CaptHindsight> that's for the older hubs and you didn't get it from me :)
[21:28:42] <mozmck> ;)
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[22:13:15] <micges> skunkworks_: looks familiar?
[22:13:19] <micges> skunkworks_: http://ibin.co/1Oo6SAH8wQqP
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[22:19:58] <CaptHindsight> if we do just write/write/write, we can get up to 1.2 MHz on the GPIOs
[22:20:16] <CaptHindsight> we did a little testing - it looks like with a read/modify/write of the gpios on the SB800 platform, we can get about 400KHz
[22:21:49] <CaptHindsight> so possibly 1.2MHz stepping on the GPIO's
[22:22:33] <CaptHindsight> well 1/2 that since thats write/write/write high/low/high
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[22:29:31] <CaptHindsight> mozmck: so this might work!
[22:29:55] <mozmck> It could! Sounds interesting anyhow.
[22:34:34] <CaptHindsight> oh, some coreboot devs are getting upset "write "i will not use a general purpouse computer as a microcontroller" on the chalkboard 100 times"
[22:34:58] <CaptHindsight> and we're weenies for using PC's :)
[22:35:28] <mozmck> heh!
[22:36:16] <CaptHindsight> I might have finally found the source for the recrap philosophy
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