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[00:00:42] <jepler> andypugh:
http://emergent.unpythonic.net/files/sandbox/0001-WIP-halcompile-fix-parsing-of-and.patch
[00:01:34] <andypugh> Ah, so I can’t have done it before.
[00:02:16] <andypugh> Do you ever wish you had called it something other than “personality”? I know I do :-)
[00:02:52] <jepler> https://www.youtube.com/watch?v=UmCZ_xzZsFQ
[00:03:08] <andypugh> Thinking about it bldc just masks but doesn’t shift
[00:03:28] <jepler> andypugh: over and over and over again I'll be a fool for you
[00:03:59] <jepler> what more can I do?
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[00:05:04] <andypugh> Halcompile is an inspired but of #define abuse. I am very impressed. And slightly appalled :-)
[00:05:14] -!- sumpfralle has quit [Ping timeout: 245 seconds]
[00:05:37] <jepler> I'm frequently called "an inspired butt" so that's OK
[00:06:31] <andypugh> I do sometimes wonder if textual subsititution in the Python phase part might have been better?
[00:06:43] <jepler> the road not taken
[00:06:55] <andypugh> (first define “better”)
[00:11:06] <andypugh> infinite loops in realtime are such fun.
[00:11:38] <andypugh> (at least is’t a VM so easy to sort out)
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[00:17:25] <andypugh> Confused:
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[00:29:02] <andypugh> http://pastie.org/10112533
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[00:33:42] <andypugh> Do I have to use strncomp to compare a single character in a modparam?
[00:38:20] <jepler> so you are expecting a parameter like sequence=a,s,d,f ?
[00:38:37] <jepler> so sequence[0] is a length-1 C string?
[00:40:02] <jepler> in that case, I'd expect after char *token = sequence[0]; that *token == 'a' is true
[00:40:57] <jepler> but I've just had a drink so my programming is worse than usual
[00:44:31] <mozmck> looked a little bit a "snappy", and it looks similar to proposals by the systemd guys, except probably not as intrusive.
[00:45:36] <andypugh> jepler:
http://pastie.org/10112551
[00:46:47] <andypugh> (I tried printing the %i format and compating to 115 and it stil failed the comparison)
[00:47:07] <andypugh> So I think perhaps I have forgotten C again.
[00:47:12] <jepler> Apr 24 17:44:33 ubuntu kernel: [ 2012.521704] invalid token in sequence must be S, R, T, F or C
[00:47:15] <jepler> Apr 24 17:44:33 ubuntu kernel: [ 2012.521706] *token = 4 pin = 0, num_in = 0, num_out = 1
[00:47:42] <jepler> it's complaining about the 4 and not the s, right?
[00:47:50] <jepler> Apr 24 17:44:33 ubuntu kernel: [ 2012.521704] invalid token in sequence must be S, R, T, F or C
[00:47:53] <jepler> Apr 24 17:44:33 ubuntu kernel: [ 2012.521706] *token = 4 pin = 0, num_in = 0, num_out = 1
[00:47:56] <jepler> pin = simple_strtol(token, NULL, 0);
[00:47:57] <andypugh> but it should have strtol the 4 after finding an s
[00:48:09] <jepler> don't you need to move 'token' forward after strtol?
[00:48:22] <jepler> you are expecting strtol to change its argument 'token"?
[00:48:34] <jepler> perhaps you need strtol(token, NULL, &token)
[00:49:16] <andypugh> Ah, thanks.
[00:49:22] <jepler> hmm simple_strtol won't build in uspace
[00:49:30] <andypugh> I had missed the printing order
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[00:50:01] <jepler> and worse the kernel docs say 378 /* Obsolete, do not use. Use kstrto<foo> instead */
[00:50:17] <andypugh> when I have used simple_strtol before (a lot in hm2) it increments token
[00:51:13] <jepler> ok, we *do* have "simple_strtol" in uspace
[00:51:31] <jepler> and I do see there are statements like this in hostmot2:
[00:51:34] <jepler> src/hal/drivers/mesa-hostmot2/hostmot2.c: hm2->config.num_encoders = simple_strtol(token, NULL, 0);
[00:52:49] <jepler> but it looks like after each simple_strtol(token), it ends up back at the top of the loop
[00:52:52] <andypugh> I need to increment token _before_ simple_strtol
[00:52:53] <jepler> char *token = argv[i];
[00:53:16] <jepler> and gets the next argument, which has been split from config= on whitespace by rtapi_argv_split
[00:53:28] <jepler> pin = simple_strtol(token+1, NULL, &token)
[00:53:31] <jepler> maybe
[00:53:34] <andypugh> simple_strrol will see an “s” and quit
[00:54:16] <andypugh> ++token ?
[00:55:07] <andypugh> pin = simple_strtol(++token, NULL, 0) feels like it should pass-by value, somehow.
[00:55:18] <andypugh> But might actually be right.
[00:55:23] <jepler> I am reasonbly sure it doesn't
[00:55:51] <jepler> assuming that ..., &token *IS* necessary ...
[00:56:09] <jepler> I wouldn't write ++token because that reads like token is modified twice in the same statement
[00:56:47] <andypugh> Yes, I think I will just token++ before the strtol
[00:57:03] <andypugh> Simple, clear..
[00:57:05] <jepler> modifying a value twice in the same statement is in the category of forbidden things in C. As a concrete example, this is not OK in C: x += tab[i++] + tab[i++]
[00:58:02] <jepler> OK, if you want to use token++ then doing it as a separate statement makes me feel better
[01:00:51] <jepler> hm simple_strtol is deprecated and kstrtol does not have the same API
[01:00:58] <andypugh> That works now
[01:01:00] <jepler> we'll have to do something about that someday
[01:02:39] <andypugh> else if (*token == 'S' || *token++ == 's'){ would be an interesting bug with optimised interpretation of the ||
[01:02:57] <jepler> yup and yuck
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[18:47:59] <KGB-linuxcnc> 03Sebastian Kuzminsky 05hy-vfd af3b1bb 06linuxcnc 10src/hal/user_comps/huanyang-vfd/hy_vfd.c hy-vfd: remove some dead code * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=af3b1bb
[18:47:59] <KGB-linuxcnc> 03Sebastian Kuzminsky 05hy-vfd dcb33d8 06linuxcnc 10src/hal/user_comps/huanyang-vfd/hy_vfd.c hy-vfd: remove some dead code * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=dcb33d8
[18:48:00] <KGB-linuxcnc> 03Sebastian Kuzminsky 05hy-vfd 839f40d 06linuxcnc 03docs/man/man1/hy_vfd.1 hy-vfd: start adding a manpage * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=839f40d
[18:48:01] <KGB-linuxcnc> 03Sebastian Kuzminsky 05hy-vfd cd0a1c2 06linuxcnc 10src/hal/user_comps/huanyang-vfd/hy_vfd.c hy-vfd: fixup --help output * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=cd0a1c2
[18:48:05] <KGB-linuxcnc> 03Sebastian Kuzminsky 05hy-vfd 8bd4451 06linuxcnc 10src/hal/user_comps/huanyang-vfd/hy_vfd.c hy-vfd: add copyright info to hy_vfd.c * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=8bd4451
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[18:59:04] <zeeshan|2> is it true that python userspace components run slower than c userspace components?
[19:02:40] <zeeshan|2> my mill vfd component is written in python, and my lathe vfd component is written in c. both seem to have lag. the lathe one bothers me more because when running CSS mode, there is like a .5 s to 1 s delay between commanded speed and actual speed.
[19:03:00] <zeeshan|2> (im using modbus serial to control speed) -- anyway to speed this up -- maybe down to .1s?
[19:04:06] <seb_kuzminsky> i think the speed of the serial communication is much much slower than the difference in speed between python and c
[19:04:29] <seb_kuzminsky> are both vfds using the same baud rate?
[19:05:00] <seb_kuzminsky> you'll probably not get good speed control through a serial-attached vfd no matter how cleverly you write the driver, is my guess
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[19:17:27] <skunksleep> We got the mesa hardware... Now which machine to convert?
[19:27:20] <pcw_home> Python + serial delays are probaby still just a few mS
[19:27:21] <pcw_home> If you have .5 to 1 second delays, I suspect thats mainly in the drive firmware
[19:33:52] <skunksleep> I would think it pretty easy to figure out if the delay is linuxcnc or the drive
[19:34:25] <skunksleep> * halscoping signals
[19:41:49] <pcw_home> not sure if you can tell when the low level serial xmit is done
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[19:43:59] <skunkworks> depends on what is exposed - I could see a pin that lets you know when the python routine is done - and then see how long the drives takes to respond..
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[20:07:11] <jepler_> if you followed the sample in 'pydoc hal', it has a 1s delay between times it checks the pins
[20:07:14] <jepler_> while 1:
[20:07:15] <jepler_> imposed by the time.sleep call
[20:07:18] <jepler_> # act on changed input pins; update values on output pins
[20:07:20] <jepler_> time.sleep(1)
[20:08:23] <jepler_> having a hal output that the python program sets after it's transmitted its serial message or whatever is a good way to see whether the delay is before or after the serial transmit
[20:08:51] <jepler_> you can scope the component's input and output and just see onscreen how long it takes
[20:08:54] jepler_ is now known as jepler
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[20:10:21] <pcw_home> also you might read something from the drive to avoid communication overruns (Though Im not too familar with modbus handshaking)
[20:10:23] <pcw_home>
[20:13:49] <jepler> if I recall serial modbus correctly, after the master sends a command it waits for a confirmation or response from the device, except in the case of broadcasts
[20:19:13] <pcw_home> Yeah, so you could look at the time till it responds (not that the tells you it changed the VFD frequency yet)
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[20:32:28] <skunkworks> if he has spindle feedback - he can see..
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[20:42:27] <zeeshan|2> seb_kuzminsky: both are using the same baud rate yes. 19200
[20:42:32] <zeeshan|2> ill try increasing it
[20:43:28] <zeeshan|2> and scoping what is causing the delay
[20:44:27] <pcw_home> 19200 is ~ 2000 chars/second so unless you have a pretty big message its probably not the main issue
[20:46:25] <zeeshan|2> ill spit the time out at send and recieve
[20:46:40] <zeeshan|2> like jepler said
[20:48:22] <pcw_home> yeah need intrumentation to see where the time goes...
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