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Author Topic: Lua Q&A  (Read 104341 times)

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Offline Jim Bauwens

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Re: Lua Q&A
« Reply #45 on: August 18, 2011, 11:08:53 am »
That above string just error's when I enter it into my calculator. Maybe because its running in a coroutine.
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Offline NecroBumpist

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Re: Lua Q&A
« Reply #46 on: August 18, 2011, 11:27:43 am »
It should have caused a segfault in the loadstring() function.
It does with normal Lua, maybe it's just not a problem on ARM. Oh well.

Anyway, what software am I supposed to use to update to OS 3 ?
I downloaded the 3.0.2.1791 .tno from TI's website, and the TI NSpire Student Software, but that seems to be a trial, and isn't recognizing my calculator. (then again, I'm not using the cord that came with it)
Any suggestions ?
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Offline Jim Bauwens

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Re: Lua Q&A
« Reply #47 on: August 18, 2011, 11:29:38 am »
Hm, should work. I didn't have any problems. I hope it isn't because its trial x)
Maybe your cable is a bit damaged?
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Offline NecroBumpist

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Re: Lua Q&A
« Reply #48 on: August 18, 2011, 11:31:49 am »
That's a possibility.
I couldn't find the original cable, so I stole one from this weird USB-laptop speaker thingy. I'll continue searching for another cable.
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Offline Lionel Debroux

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Re: Lua Q&A
« Reply #49 on: August 18, 2011, 11:35:25 am »
The cable for connecting the Nspire to the computer is a standard USB A <-> mini-USB B cable :)

BTW, never transfer unmodified OS 3.x versions to a Nspire Clickpad or Touchpad. As described in various news and forum topics here and elsewhere, use TNOC to remove the boot2 3.0 upgrade. It will preserve your ability to downgrade, through DowngradeFix, which is a specially crafted fake OS upgrade exploiting a stack-based buffer overflow in boot2 1.4 to kill the "minimum accepted OS version" information set by OS 2.1.0.631 and 3.0.2.1791 :)
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Offline Jim Bauwens

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Re: Lua Q&A
« Reply #50 on: August 18, 2011, 11:37:08 am »
Yes, I forgot to mention that. Thanks Lionel :)
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Offline NecroBumpist

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Re: Lua Q&A
« Reply #51 on: August 18, 2011, 11:44:03 am »
Thanks for the tip, I'm downloading TNOC now.
I also managed to find what I believe is the original cable :D This time my computer recognized the device.
Welp, once I get this on I'll be working on trying out Lua assembly and a few lua bugs on my calc :)

Thanks for the help Lionel and Jimbauwens
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Offline Lionel Debroux

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Re: Lua Q&A
« Reply #52 on: August 18, 2011, 11:45:22 am »
For direct on-calc testing, you can use oclua; otherwise, use Luna :)
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Offline NecroBumpist

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Re: Lua Q&A
« Reply #53 on: August 18, 2011, 11:59:59 am »
On calc Lua editing ? Absolutely epic.

Except for TNOC just crashed twice when I tried to patch my OS. Are the final output files supposed to be TNO_WOB2SA files ?
Anyway, after *trying* to remove the boot2 and examples, I get a file that is 7,672KB large, and with an md5 hash of c76b06af603692518b3e2c30131a5380
Is this the right output ?

Edit: I got it to work without crashing, and it produced a .TNO_WOB2SA file, should I just rename this to a .tno file so TI's student software will see it and install it on my calc ?
« Last Edit: August 18, 2011, 12:16:06 pm by NecroBumpist »
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Offline Lionel Debroux

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Re: Lua Q&A
« Reply #54 on: August 18, 2011, 12:21:28 pm »
Quote
I got it to work without crashing, and it produced a .TNO_WOB2SA file, should I just rename this to a .tno file so TI's student software will see it and install it on my calc ?
Yes :)

TNOC crashes pretty often indeed. I've tried to use Valgrind to pinpoint the crash, but there's so much noise in the output (many different causes of improper memory accesses outside of TNOC itself) that it hasn't helped. I'm not sure it would be easy to create meaningful ignore files.

EDIT: I haven't been able to make a meaningful list of suppressions, but
Code: [Select]
valgrind -v --tool=memcheck --num-callers=5 --leak-check=no --malloc-fill=0x55 --free-fill=0xAA ./TNOC_frshows that the code of TNOC 1.21 contains at least one use-after-free error.
When --free-fill=0xAA is passed to valgrind, TNOC cannot open any input file. Tracing the value of variables path and path_2 thusly:
Code: [Select]
else if (error == -2)
{
QMessageBox::critical(this,tr("Attention !"),tr("Fichier Introuvable"));
printf("XYZ \"%s\"\n", path);
printf("XYZ \"%s\"\n", path_2);
}shows that path is entirely made of 0xAA values...
And, since the only line that modifies path is (because convert_file does not modify its "input" argument):
Code: [Select]
const char* path = LineEdit->text().toStdString().c_str();it means that variable "path" is always invalid in the first place, and that the current code works only accidentally !


Levak ?
« Last Edit: August 18, 2011, 01:21:45 pm by Lionel Debroux »
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Offline NecroBumpist

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Re: Lua Q&A
« Reply #55 on: August 18, 2011, 04:36:56 pm »
Wow, this is great! Thanks again for all the help, Lionel and Jimbauwens!
I can't wait to begin exploring some of the API!
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Offline Jim Bauwens

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Re: Lua Q&A
« Reply #56 on: August 18, 2011, 04:39:33 pm »
I'd suggest you to checkout inspired-lua.org. There most findings/stuff are documented :)
Have fun!
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Offline NecroBumpist

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Re: Lua Q&A
« Reply #57 on: August 18, 2011, 08:21:56 pm »
When you run a script, and then your calculator immediately reboots itself starting from the Loading OS screen, does that mean you did something wrong  :P ?
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Offline zeldaking

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Re: Lua Q&A
« Reply #58 on: August 18, 2011, 08:22:55 pm »
I would probably say yes. But then again if I am wrong, punch me.
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Offline pianoman

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Re: Lua Q&A
« Reply #59 on: August 18, 2011, 11:28:39 pm »
I'm actually not too sure that its your fault, as usually, the program doesn't crash the calulator, it just tells you about the syntax error.
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