#linuxcnc-devel | Logs for 2012-07-04

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[01:58:17] <jepler> I don't think you've correctly analyzed the problem. An s32 can count up to about 2 billion and a __u32 can count up to about 4 billion. That's 68 and 136 years, respectively.
[01:59:40] <jepler> However, I don't immediately spot what part will overflow. "double totalnsec" will only begin to lose precision after about 2^53 nanoseconds, which is 104 days; but its ability to count up accurately won't be seriously compromised until about 2^53microseconds, which is 285 years
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[02:03:13] <jepler> 84 hours = (totalseconds / 3600) % 60;
[02:03:25] <jepler> this line will make 'hours' go back to 0 after 60 hours...
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[11:39:07] <jthornton> hi jepler it reset after a little over an hour so there must be something else wrong with my code
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[13:42:15] <jepler> - totalnsec = totalnsec + period;
[13:42:15] <jepler> + totalnsec = totalnsec + period * 1000;
[13:42:26] <jepler> I ran on a sim setup with this change, so that it counts 1000x as fast as it should
[13:42:32] <jepler> but I didn't observe a "reset" after an hour
[13:43:16] <jepler> tested in halrun with 'setp time.0.start 1', , not with the halui.program.is-running pin.
[13:47:49] <JT-Shop-> I'm running it on sim too and it's been running for a couple of hours
[13:48:03] <JT-Shop-> using setp time.0.start 1
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[13:56:27] <jepler> so it seems unlikely but maybe there's a glitch that occurs on halui.program.is-running, which leads to the timer restarting?
[13:56:39] <jepler> if so, you could use halscope and trigger on halui.program.is-running going low
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[13:59:31] <JT-Shop-> ok, I'll set up a test program that will run for a couple of hours and see
[13:59:40] <JT-Shop-> thanks for looking at this
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[14:04:13] <jepler> sure
[14:06:17] <JT-Shop-> I was running a subroutine so I'll try both as a subroutine and not
[14:06:58] <jepler> so far I've noticed that pausing makes is-running go false
[14:08:59] <JT-Shop-> ah ha I paused the program to clear some swarf
[14:09:12] <JT-Shop-> and didn't even think of that
[14:11:24] <JT-Shop-> I need to add halui.program.is-paused or make halui.program.is-idle what stops the timer
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[14:18:38] <JT-Shop-> another great mystery solved by jepler :-)
[14:20:06] <skunkworks__> oh - I like a good mystery
[14:20:10] <skunkworks__> logger[psha]:
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[14:39:34] <JT-Shop-> or2ing halui.program.is-running and halui.program.is-paused to time.0.start and the timer keeps timing while paused :-)
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[15:36:33] <jepler> maybe you want the not of is-idle
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[15:37:19] <jepler> if you use the or of is-running and is-paused, then there's a tiny and probably only theoretical opportunity for a glitch
[15:37:53] <jepler> since halui is a userspace component, that means something running in a realtime thread can see the state of affairs where only some of the pins have been updated to the new value in the userspace component
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[15:38:23] <jepler> i.e., imagine you're switching from paused to running, and then realtime runs between the assignment to *(halui_data->program_is_paused) and the assignment to *(halui_data->program_is_running)
[15:38:32] <jepler> that means they would both be false "at the same time"
[15:38:48] <jepler> this is the sort of thing that you'd probably only observe once in a blue moon
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[15:50:09] <jthornton> thanks jepler that makes better sense than what I came up with and I did have the thought of what if both are off at the same time
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[16:39:42] <alex4nder> hey
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[16:57:23] <CIA-120> 03jthornton 07v2.5_branch * rc58b74769e37 10/src/hal/components/time.comp: Comp: change description to show how to keep time running when paused
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[18:02:54] <jepler> jthornton: did you fix the overflow at 60 hours part? I didn't look at your commit..
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[18:58:55] <jthornton> jepler, no I just changed the description on that commit
[19:05:13] <jthornton> hmm if I'm using u32 I won't need the modulo part as it will return a u32?
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[19:05:36] <jthornton> but only for the hours part
[19:06:22] <jthornton> which will be rounded to the nearest hour by having hours = (totalseconds / 3600);
[19:13:48] <CIA-120> 03jthornton 07v2.5_branch * r53eafc0e32f1 10/src/hal/components/time.comp: Comp: fix hours wrapping at 60
[19:14:28] <jthornton> got it jepler thanks
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