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#rockbox log for 2012-09-25

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10:35:28amiconnZagor: ping
10:35:36Zagorpong
10:36:07amiconnIn case you didn't see it - I repaired my android ndk. Do I need to do anything special to re-enable my client for android builds?
10:36:48Zagorno, it gets unblocked automatically after 10 minutes
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10:37:20amiconnah ok
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11:03:48wodzn1s: https://docs.google.com/open?id=0Bx1OY3AHjewUNWxQeFUtbTQ5MW8
11:04:32n1swodz: thanksd
11:04:34n1s-d
11:05:00wodzpasswords are standard: root:root and user:user :P
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11:29:51wodzmortalis: ping
11:29:58mortaliswodz: pong
11:30:35wodzmortalis: you are not using DWDMA irq for anything other then counting lcd updates, right?
11:32:36mortalisyes, but i think we could use them to know when transfer complete
11:33:03wodzwe could it it works reliably
11:33:12wodzs/it/if/
11:33:54wodzwe could then setup semaphore released in IRQ just as we do in sd driver
11:34:07mortalishttp://pastebin.com/etrL701R
11:34:38wodzexactly
11:37:19wodzI still see possible race condition. DMA will signal finish when it transfers last 4 lines to the buffer. This lines still need to be moved to lcd controller. This leaves small time gap where new transfer can corrupt data in lcd controller.
11:38:32wodzmortalis:^
11:40:12[Saint]<AlexP> I think I'm running out of skin buffer now <−− Not technically possible
11:41:31wodz[Saint]: why not possible? mem has finite size
11:41:50mortaliswhy do you think dma send finish signal while transfering last 4 lines and not when they are already transfered?
11:42:12CIA-10Commit afc6b3f in rockbox by 03Nils Wallménius: opus: asm MULT16_32_Q15 for arm and cf
11:42:20[Saint]<AlexP> As if I use a backdrop viewport then it won't show my backdrop set in Rockbox, I have to load it in the wps using %x correct?
11:42:20[Saint]<AlexP> Well, if I do that I get the fallback <−− This is a bit of a tricky one, but, to do this you must first define a fullscreen viewport, then %x your backdrop at 0,0, then define another fullscreen viewport and continue coding as normal after this.
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11:42:42wodzThey are transfered but they end up in lcdbuf. lcdif will transfer it internally to lcd controller but this will take some time
11:42:46[Saint]wodz: "not technically possible" in so far as bufflib will allow you to eat all remaining buffer.
11:43:18[Saint]So, you'd have no audio buffer left...making the wps irrelevant as playback wouldn't be possible ;)
11:43:41wodz[Saint]: true but out-of-buf IS technically possible
11:44:29[Saint]well, yeah...I did word it badly. My point was, if you're out of "skin buffer", then you're out of audio buffer too...so the skin buffer doesn't matter :)
11:44:43 Quit n17ikh (Ping timeout: 268 seconds)
11:45:07mortaliswodz: understood, we could add some delay after mutex_lock.
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11:46:15wodzmortalis: we need to check if it is needed anyway
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11:49:42wodzmortalis: IMO this while (!(LCDC_STA & LCDC_MCU_IDLE)); should handle the case but when testing I couldnt record any case where it didn't return IDLE state of lcdif
11:50:05***Saving seen data "./dancer.seen"
11:51:56mortalismaybe it's just very rare case.
11:53:54wodzplease update g#306 so I could test it on my DAP
11:53:56fs-bluebot3Gerrit review #306 at http://gerrit.rockbox.org/r/306 : rk27xx lcd code rework by Marcin Bukat (changes/06/306/2)
11:55:54mortalissure
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11:56:59n1swodz: got it
11:58:08wodzn1s: I think it would be great if you post test_codec results for opus
12:00
12:01:25kugeln1s: dont you need to reset the emac to its old state?
12:02:08n1swith the latest push the 64 kbps test file i've been testing with is 57.53% realtime on cf (215.54MHz), 85.87% realtime on c200 (93.16MHz) and 221.04% realtime on fuzev1 (112.19MHz)
12:02:33n1skugel: no, everything that uses it is responsible to set it up to what is required
12:02:38kugelok
12:04:34wodz57.53% on cf sounds like a lot needs to be done for opus to be usable on this platform
12:05:34n1swodz: still, no iram is used at all, and it helps quite a lot, with my hacky patches it gets to ~90%
12:06:07n1sbut the way they decided to allocate memory makes doing it in a nice way hard
12:08:53n1skugel: the emac macsr is also stored when switching context so each thread can have its own mode
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12:14:26n1stwo state structs with at least one having a flexible array member allocated in a single buffer and accessed with offsets, and some weird macro voodoo to only memset certain parts of the buffer when clearing the state
12:14:29mortaliswodz: done. I didn't test it on my dap yet, but it should work.
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12:15:36wodzmortalis: I'll test it on mine when I get back home
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12:18:40n1salso writing some better asm functions for the hot paths will probably help quite a bit, since these very short inlines will hit pipeline stalls on both cf and most arm cores better than arm7
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12:23:53wodzn1s: I guess this control structs don't fit in iram
12:25:10n1swell, maybe i have not dug through it all but they are not statically sized so i'd need to find the worst case size
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12:27:12kugeln1s: you could use buflib to dynamically alloc from iram
12:27:41[Saint]Ooooooh, that sounds like fun.
12:27:55n1sit's not much fun actually
12:28:25[Saint]Well, I was just going to say: "where fun == "not very fun at all"" ;)
12:29:01n1stremor does dynamic iram allocs and quite a lot of thinking was required to get it "right"
12:30:35n1syou need to think about the order of allocs and what to do if one fails and hope the compiler or some global header or something changes somethign so an iram function grows too big so more allocs fair, etc
12:31:16n1ss/changes/doesn't change/
12:31:29n1salso s/fair/fail/
12:32:14n1sanyway, i'd like to try getting it realtime with static allocs for now and look at that stuff if necessary later
12:32:51n1sthe memory constraints on lowmem targets are also something to look at
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13:05:50freqmodn1s: have you discussed the changes you are doing with the opus-guys
13:06:00freqmodto try to keep the source trees as similar as possible?
13:06:15n1sfreqmod: no, not yet at least
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13:07:30freqmodmaybe you could mention it on #opus and ask if they are interrested in cooperating
13:07:41freqmodthere are at least some common nicks on #opus and #rockbox
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13:09:15n1sdo you think they would be interested in a patch to add a config option to disable some encoding only code and more of the code only used when CUSTOM_MODES is enabled
13:09:56n1sthat's the only slightly intrusive thing i've done so far
13:10:08freqmodi don't know, but there were some people here which sounded like they worked on it asking what was required for opus support when i was looking at it 1 month ago
13:10:31n1scutting out unused code is important to free up memory on our low mem targets
13:11:09freqmodmaybe an ifdef encoding could be introduced if it doesn't add too much code
13:16:12wodzn1s: what was wrong with crc? mac mode?
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13:16:46n1sthe other things will mostly be some inline asm functions that can probably be in separate header files and sprinkling of some rockbox specific attributes and possibly some very rockbox specific memory allocation changes
13:17:27n1swodz: yes, i forgot to set it in my initial attempt
13:18:05n1salso for some reason it took me a while to remember the 31 pos shift
13:18:28n1sso the pushed version gives exactly the same output as the c code
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13:25:47*kugel wonders how hard would it be to re-use %ac etc to align images
13:50:08***Saving seen data "./dancer.seen"
13:58:32[Saint]Hmmm...where in the code do I find the preferential ordering of album art?
14:00
14:00:01[Saint]Is file based or embedded art preferred?
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14:17:13pixelma*IIRC* the wiki or the manual said, embedded album art was preferred
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17:11:35n1sfreqmod: should i ask anyone in particular in #opus ? just asking the channel didn't seem to give much response
17:18:58derfn1s: What were you asking about?
17:19:18derf(I got knocked offline due to a power outage, so I must have missed it)
17:19:27n1s<n1s> Hi, i'm looking at optimizations for the opus codec for rockbox, (rockbox.org) some of our targets have very little memory so i disabled some encoder only code. Are you guys interested in a cleaned up patch adding some #fidef ENCODER or something to disable this code?
17:19:59derfAh, that's a jmspeex question.
17:20:42derf(I personally think it's a fine idea)
17:20:53n1sok, i'll try asking him then
17:24:13CIA-10Commit 5f60590 in rockbox by 03Nils Wallménius: opus: put some const tables and structs in iram
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17:55:39Buscheldid anyone add opus to the related the manual sections yet?
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19:20:16freqmodhttp://gerrit.rockbox.org/r/#/c/319/
19:20:31freqmodhopefully this will fix seeking at 0
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21:00:35lorenzo92bertrik: are you the RDS man? :) I'm trying to add RDS to YP-R0 target, in fact it works in various ways I tried but after a certain amount of time rockbox goes into segmentation fault!
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21:07:31kugellorenzo92: did you see my remark?
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21:11:25lorenzo92oh no...wait
21:12:10lorenzo92kugel: uhm the one about threading in RaaA?
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21:17:12lorenzo92*sempaphores
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21:36:43kugellorenzo92: yes
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21:44:01lorenzo92kugel: okay then, I don't know much of this stuff :p perhaps is worth posting there the three ways I tried to achive rds...
21:48:28kugellorenzo92: most likely worth it yes
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21:54:06lorenzo92kugel: http://pastebin.com/PTbFaf2v
21:55:18lorenzo92in the meantime I'm back debugging usb...
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22:02:08kugellorenzo92: the first one might not work
22:02:19kugelbecause of what I said
22:02:45kugelhowever it's supposed to work, there's an issue with the RaaA threading implementation
22:03:20kugelwhat about the second approach?
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22:06:07lorenzo92the same
22:06:13lorenzo92it crashes after a little time
22:07:22lorenzo92*little = about a minute
22:08:36kugelhm strange
22:08:46kugelyou did try to increase the stack size didnt you?
22:09:00lorenzo92ouch! right...I'll try
22:09:29lorenzo92kugel: using the second way?
22:09:34kugelyes
22:11:02kugelhm I would expect the second approach to work
22:16:43lorenzo92pff it crashed..
22:18:34lorenzo92I open the serial now to see if segmentation fault or what
22:19:22lorenzo92btw in some weeks I will receive my ttl<->usb converter in order to use R0's hw UART interface
22:22:23kugelcool
22:22:47kugelwhat serial interface are you talking about?
22:23:27lorenzo92so we have compiled the g_serial usb gadget via usb, but there is also the UART ;)
22:23:36lorenzo92vannix tested it, perfectly working :)
22:24:15lorenzo92kugel: http://dl.dropbox.com/u/21543264/YP-R0/R0_UART.jpg
22:24:45lorenzo92kugel: ah! now seems stable uhm
22:25:00lorenzo92kugel: with cable inserted -> backlight always on
22:27:48lorenzo92well now seems working anyways
22:38:13lorenzo92kugel: yep seems really stable now :)
22:41:17kugelnice
22:41:26lorenzo92kugel: crashed :(
22:41:35kugel:-(
22:42:36kugelcan you find the cause?
22:43:13kugelI once managed to obtain a backtrace with gdb
22:44:18lorenzo92no idea...
22:44:30lorenzo92strange is that
22:44:40lorenzo92for example now is running nicely
22:45:49lorenzo92crashed
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22:50:19lorenzo92kugel: I'm pretty sure there is something to investigate in drivers/rds.c
22:51:18lorenzo92look at strcpy, should we do the same trick?
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22:57:07kugellorenzo92: did you also #undef RDS_ISR_PROCESSING ?
22:58:26kugellorenzo92: not sure what trick you mean. the process-4bytes-at-a-time one?
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23:00:08lorenzo92kugel: why #undef? where? I was talking about the strcpy of get_ps / get_rt...
23:00:20lorenzo92kugel: was testing now using the string copier!
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23:02:33kugellorenzo92: still dont understand what trick you mean
23:02:50kugelcopy the data before passing to rds_process()?
23:03:02lorenzo92nono I was talking about rds.c
23:03:10lorenzo92precisely, /* Need triple buffer so string isn't clobbered while caller is using it */
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23:03:47kugeli see that. where do you want to apply that?
23:04:29lorenzo92nevermind, it has crashed...okay so back to the @ndef
23:04:33lorenzo92#undef
23:04:40lorenzo92why and where?
23:05:24kugeli wondered if you removed #define RDS_ISR_PROCESSING when testing the second approach
23:05:46kugelshouldnt make a difference actually
23:07:56lorenzo92ah yes yes, RDS_ISR_PROCESSING needs more functions too
23:08:11lorenzo92btw I did not enable it even when using the first approach
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23:09:02kugelthat's right
23:09:15lorenzo92ok
23:09:37lorenzo92no idea how to debug the thing :(
23:09:48kugelhm wait
23:10:05kugelusing your first approach you use linux semaphores, not rockbox semaphores
23:10:22kugelah, nevermind
23:11:58lorenzo92i've also used a work queue (when irq is triggered) in the module...but doesn't make any difference
23:12:26kugelthe problem could be in rockbox code
23:13:09lorenzo92actually it should be there indeed...
23:13:43lorenzo92but why after some time? I don't say it's a fixed amount of time, but quite close to be...
23:14:57kugelcan't tell
23:16:17lorenzo92a bug in rds.c?
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23:18:35kugelpossibly
23:18:49kugelunfortunately i know nothing about rds
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23:21:25lorenzo92I'm wondering if gdb can be run remotely using the serial port?
23:21:35lorenzo92(I never used gdb so far ^^)
23:23:07lorenzo92kugel: do you have a compiled arm gdb?
23:25:43kugelsomewhere, yes
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23:26:07lorenzo92well I can always compile it :)
23:26:17kugellorenzo92: you should be able to run gdb via serial, but I don't know how
23:26:24kugeldo you have shell access?
23:26:52lorenzo92yep
23:26:56lorenzo92via usb for now
23:27:14kugelthats great
23:33:51kugellorenzo92: one moment
23:37:12kugellorenzo92: http://www.alice-dsl.net/simonemartitz/rockbox/gdb-ypr0.zip
23:39:01lorenzo92okay, starting the serial, one second ;)
23:40:16lorenzo92I'm in ;)
23:40:33lorenzo92so...what to do now? :p
23:41:57kugelrun rockbox
23:42:44lorenzo92running it...
23:42:57kugelwait until it crashes
23:43:59kugelyou probably need a rockbox binary with debug symbols (I think ../tools/configure > advanced > debug should do it)
23:44:17kugelonce it crashes you can get the backtrace with "bt"
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