| --- Log opened Tue Apr 12 00:00:41 2011 |
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| --- Log closed Tue Apr 12 02:05:26 2011 |
| --- Log opened Tue Apr 12 02:56:41 2011 |
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| 02:56 | < SchoolPhox> | I'd almost say there's something bigger going on here. I don't know what, though. Everything's pretty modular. |
| 02:57 | | Irssi: Join to #code was synced in 48 secs |
| 02:57 | < SchoolPhox> | And, I mean, what could possibly be happening to cause intermittent errors like this? Nothing I've ever heard of. |
| 03:03 | < SchoolPhox> | Alright. I think I have it narrowed down. The dev environment I use has an option to clean the project prior to building. |
| 03:05 | < McMartin> | Ah. |
| 03:05 | < SchoolPhox> | That resets the memory to a default state, and deletes any unused variables hanging around from previous builds. At least, I think that's what it does. |
| 03:05 | < McMartin> | You may have some dependencies fucked up. |
| 03:05 | < McMartin> | s/variables/object files/ |
| 03:05 | < SchoolPhox> | Oh, is that what it does? |
| 03:05 | < McMartin> | Clean resets your *build system* |
| 03:05 | < McMartin> | Normally when you rebuild it only builds the files that changed and uses old values of everything else. |
| 03:06 | < McMartin> | However, if it doesn't know which bits go with which final executables, some will still be using old stuff |
| 03:07 | < SchoolPhox> | Okay. That makes a lot of sense, then. This is code that's been floating around on my computer for months, being worked on when I had the time. It's seen a lot of re-writes, and major shuffles. |
| 03:07 | < SchoolPhox> | I don't think I've cleaned it even once |
| 03:07 | < SchoolPhox> | Anyway, it seems to have fixed most of the problems. No more spontaneous jaunts into data abort land |
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| 04:43 | < SchoolPhox> | Man, am I ever in over my head. Can't even pass an array between functions. Think I need a break, or something |
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| 06:45 | < Phox> | Alright. Breakpoints; What do the do to your code? |
| 06:45 | < Phox> | &they |
| 06:45 | < Phox> | Basically, I have an interrupt routine. It doesn't work. I can trigger an interrupt on IRQ2, then an interrupt on IRQ3. |
| 06:46 | < Phox> | I can't trigger two interrupts in a row on IRQ2, though. |
| 06:46 | < Phox> | Now, here's the odd part. If I add breakpoints to the interrupt routine, I can trigger multiple interrupts successively on the same IRQ |
| 06:46 | < Phox> | Remove the breakpoints, the program breaks, again |
| 06:47 | < Phox> | None of the operations in the routine are time critical. I write to a variable, clear a couple registers, reset the interrupt, then return to where I was before. |
| 06:48 | < McMartin> | Breakpoints are different from architecture to architecture. |
| 06:48 | < McMartin> | On x86, it's int 3 |
| 06:49 | < Phox> | I don't have the spec-sheet in front of me, but the breakpoint is implemented through a Jtag interface, and has a dedicated interrupt. |
| 06:50 | < Phox> | The jtag actually works through an emulator of some sort, kind of watching from above the code. |
| 06:50 | < Phox> | My understanding may be lacking, but I can't really see how I could possibly be effecting the code itself. |
| 06:51 | < Phox> | *affecting? |
| 06:56 | < Phox> | Well, anyway, I guess I'll crash. Tomorrow'll be a complete reinstall of the dev environment, redownload the libraries, and whatever else I can think of. At this point I'm troubleshooting with code that I've had running in front of me, and know that it should work. |
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| 10:02 | < Tamber> | Morning, Watcher. |
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| 10:02 | < TheWatcher> | Ullo |
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| --- Log closed Tue Apr 12 14:21:44 2011 |
| --- Log opened Tue Apr 12 14:22:02 2011 |
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| 15:01 | < gnolam> | "ConfigPathChangerA handy little class which changes current path to the path of given entry and restores it in the destructoir" <- destructoir? wxPython est francais? |
| 15:01 | < gnolam> | Suddenly, I don't know if I can entrust my simulated frogs to it. :-/ |
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| 20:02 | < gnolam> | http://www.youtube.com/watch?v=lyZQPjUT5B4 |
| 20:04 | < gnolam> | See, that's what happens when you use Hungarian notation... |
| 20:39 | < Derakon> | And here I was expecting magma. |
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| --- Log closed Tue Apr 12 21:42:24 2011 |
| --- Log opened Tue Apr 12 21:42:32 2011 |
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| 21:58 | < SchoolPhox> | Dunno if any of you were actually interested in the issues I was having with the micro, but I think I've tracked it down. The ICE emulator isn't interrupt-safe. Placing stop-points in an interrupt clears the interrupt prematurely, which causes problematic behaviour. |
| 21:59 | < SchoolPhox> | It reads the interrupt registers, which causes the micro to think the vector register has been read, and automatically clears the interrupt, possibly before it occurs. |
| 22:04 | < gnolam> | The ICE emulator? Are you building an ATM machine?~ |
| 22:04 | < SchoolPhox> | Yeah. Working on an atmel ARM7 |
| 22:04 | < SchoolPhox> | Wait |
| 22:05 | < SchoolPhox> | ATM, like.... automated teller? |
| 22:05 | < SchoolPhox> | In which case you've got a reduncancy, there |
| 22:05 | < SchoolPhox> | Also, that's not what I'm doing |
| 22:06 | < gnolam> | As a member of the Department of Redundancy Department, I felt compelled to make fun of your use of "ICE emulator". |
| 22:06 | < SchoolPhox> | Ah, crap |
| 22:08 | < SchoolPhox> | Hmm. Actually, looking into the documentation on this chip, it may not be the emulator |
| 22:09 | < SchoolPhox> | I'm using JTAG to debug. Shouldn't be able to switch to ICE without a reset. The documentation is pretty specific that the interrupt issues are due to the ICE. |
| 22:10 | < SchoolPhox> | But, it works anyway. I'll have to dig into that some other time |
| 22:19 | < SchoolPhox> | Ah. Incidentally, I need to pass a 2d array between functions, where I write to it in the second function. Should it be declared "char tbl[3][256]", passed as "foo(tbl, r, c)", and received in the second function as "bar(table[][], r, c)", where r and c are the number of rows and columns? |
| 22:20 | < SchoolPhox> | Err, second function should be void foo, not bar |
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| 22:23 | < gnolam> | No. |
| 22:24 | < gnolam> | table[][] won't work. |
| 22:24 | < gnolam> | You can at most have one unknown dimension. |
| 22:25 | < gnolam> | (And it has to be the innermost) |
| 22:25 | < SchoolPhox> | Any workarounds? I'm looking at a method that uses malloc and nested pointers |
| 22:27 | < gnolam> | TBH, it's usually just easiest to use 1D arrays. |
| 22:27 | < gnolam> | And calculate the offset yourself. |
| 22:28 | < McMartin> | If the assignment is "use nested pointers", you want like **table. |
| 22:29 | < SchoolPhox> | How predictable are multidimensional arrays created? Like, the second set of elements begins immediately after the first? |
| 22:29 | < SchoolPhox> | Or, is that compiler-specific? |
| 22:30 | < McMartin> | Compiler specific |
| 22:30 | < SchoolPhox> | Hmm. So, calculating the offset would reduce portability, then? |
| 22:30 | < McMartin> | Oh, no. |
| 22:30 | < McMartin> | There you aren't letting the compiler have a say |
| 22:30 | < McMartin> | This would be like, a 4x5 grid |
| 22:30 | < McMartin> | And you'd have foo[20] |
| 22:31 | < McMartin> | And to read (x, y) you'd read foo[y*5+x] |
| 22:31 | < SchoolPhox> | Ah. Okay. |
| 22:33 | < gnolam> | McMartin: Are you sure? ISTR that all multidimensional arrays are contiguous blocks of memory, with the expected offset between rows. |
| 22:34 | < McMartin> | gnolam: I'm not positive you technically get to rely on row-major vs. column major |
| 22:34 | < McMartin> | It would not surprise me if in practice you can |
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| --- Log closed Wed Apr 13 00:00:01 2011 |