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[02:19:59] <the_wench> tjtr33: skunkworks said Let me know when you are on...
[02:21:45] <tjtr33> !seen fenn
[02:21:45] <the_wench> last seen in #freecad 2014-11-17 14:53:12GMT 838:59:59 ago, saying joined chan
[02:23:08] <tjtr33> oh well fenn would like a robot tensegrity
http://creativemachines.cornell.edu/icotens
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[16:26:34] <mozmck> Using python, can I read a HAL parameter from another component? All the samples I find only show reading pins etc from the HAL component associated with that python module.
[16:30:17] <cradek> no, surely you have to make them pins and connect them together
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[16:33:52] <mozmck> ok, I thought surely I could do that.
[16:34:28] <mozmck> My thought was to reduce the number of pins that get checked and updated
[16:35:02] <cradek> I guess the hal utils like halmeter read parameters from others, but I think they do that by manipulating the hal shm goop directly
[16:35:21] <mozmck> hmm, ok
[16:36:04] <mozmck> If a setup has many hal pins and signals, will that potentially slow things down on a slower computer?
[16:36:12] <cradek> if two components need to communicate values, pins are the normal way? not sure what you're facing here that led you to want a different way.
[16:37:27] <cradek> once pins are connected, they are just pointers. I think how many other pins exist doesn't affect how fast reading/writing through a pointer is.
[16:38:16] <cradek> there are limits to the number of pins, though, because the max hal shared memory size is fixed
[16:38:29] <cradek> but it's not a speed issue, it's a space issue
[16:39:09] <mozmck> Ok, I guess I don't know how some of that works still.
[16:41:26] <mozmck> Do signals get updated at the base thread rate?
[16:43:09] <mozmck> Or do they change all connected pins as soon as the signal is changed?
[16:43:53] <cradek> with signals there is no copying, everything is a pointer to one memory location
[16:44:05] <cradek> so all read and write operations on it are atomic
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[16:45:40] <cradek> so in a servo thread component if you read a pin twice in a single run of your function, you might get two different values (if a base thread component preempts you and changes it in between your reads)
[16:47:09] <mozmck> hmm, ok. So linking a pin to a signal sets the pins pointer to the signal location? Where does it point to when not linked? Maybe I should just read some more code and quit asking all these questions :)
[16:47:23] <cradek> yes
[16:47:37] <cradek> when not linked it points to a private dummy spot
[16:48:17] <mozmck> I see. thanks for the information. I'll use pins then and connect them.
[16:48:28] <cradek> 8702094f3779 is an example of being defensive against preemption changing a value in the middle of some calculations
[16:51:01] <mozmck> If that's a git commit, I can't find it.
[16:51:07] <cradek> err, maybe it's not, I don't understand that change
[16:53:21] <cradek> aha I wasn't the only one: df3f3609bd9 finishes it
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[16:56:15] <mozmck> ok, I found those commits, and understand I believe.
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[16:59:34] <mozmck> I think it's like the read-modify-write problem in some microcontrollers.
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[17:19:34] <ju_emb> linuxcnc channel is busy with house building so sorry if I ask here about some doubt's I have
[17:20:11] <ju_emb> what is the relation in the ini file between velocities and scale?
[17:20:54] <ju_emb> I put down the scale to match my machine and she becomes slow in movement
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[17:24:49] <mozmck> Maybe you need to change the max velocity?
[17:26:21] <ju_emb> My problem is, beside of making that machine work, I like to understand that.
[17:26:58] <ju_emb> and Doc's say's Velocities are in machine units per time
[17:27:17] <ju_emb> so scale shouldn't have a influence on it
[17:27:18] <mozmck> SCALE sets the steps-per-unit, so if it takes 5000 steps to move an inch, your scale should be 5000
[17:27:41] <ju_emb> that I understand
[17:28:00] <ju_emb> in my case I have 2.9 steps per unit
[17:28:14] <archivist> scale changes how many steps per time at max velocity
[17:29:51] <mozmck> Yes, scale will influence it. If it takes 2.9 steps per unit (I guess that's mm?), but you set scale to 6 steps per unit, then the machine will move 6 steps and think it has gone 1 unit, but it really went 2.x units
[17:31:49] <mozmck> So the machine actually moved twice as fast as it thought it was moving.
[17:32:49] <ju_emb> that's OK and I understand it. What I don't understand is max velocity is 25 mm/s scale is 80 machine runs but doesn't have the scale
[17:33:37] <mozmck> I don't understand that sentence - "doesn't have the scale"?
[17:33:38] <ju_emb> so that means she generates makes 25 * 80 steps per sec
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[17:34:23] <mozmck> Yes
[17:34:42] <ju_emb> sorry, she does not run the distance she shout because physical setup is 2.9 steps per unit
[17:35:10] <mozmck> I see, that means you missed something in calculating the scale.
[17:35:37] <mozmck> If you are using steppers, how many microsteps is it set to?
[17:35:46] <ju_emb> now I put scale in 2.9 without changing velocities
[17:36:19] <ju_emb> she generates means 25 * 2.9 steps per second
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[17:37:00] <ju_emb> but she should still run at 25mm per sec
[17:38:08] <ju_emb> mazmck: is fullstep
[17:39:13] <mozmck> Look on page 19 of the Getting Started manual for more information about SCALE
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[17:39:33] <mozmck> bbl
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[18:26:51] <mozmck> Can you pass a haltcl file to gladevcp with -H?
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