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#rockbox log for 2013-11-28

00:03:51 Quit Zagor (Quit: Clint excited)
00:08:24 Quit cmhobbs (Ping timeout: 265 seconds)
00:16:05 Quit pamaury (Ping timeout: 272 seconds)
00:16:21kugelI've got queue_* functions working with pthreads
00:17:15kugel(that, among other work, might enable us to re-use our playback core in other applications/non-"legacy" UIs)
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00:19:04kugelI found that there areN't relly nice message/event queue APIs out there
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03:51:34chrisjjpamaury: Thanks for the LCD explanation. (I had read the datasheet.)
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04:08:47chrisjjRe Issue 1, the white flash, it might be worth keeping in mind that though yes on restore from display low power state it is short, on boot (after 'Executiing') it is longer. At the point of that boot white flash (and instead of it) we are still getting occasional hang with black screen requiring reset. I have a hunch this is related to power button use and will test further to find a reproducable case.
04:10:04chrisjjClearly the flash iteself is easy to fix by ensuring the LC is black before enabling backlight.
04:16:47chrisjjRe Issue 2, the corruption, I beleive this is not confined to the (now removed) power up on restore from low power. It also can happen on the initial power-up, as reported by MrJoe in the forum. It seems to vary with unit, and I have not seen it on the identical model of ZEN to MrJoe's, or the other two units I've tried.
04:21:59chrisjjRe Issue 3, LCD stays black and device unresponsive, I do think it is related to the LCD because here it occurred mostly following the (now fixed) LCD getting stuck white. What's odd about that one is that the state of the LCD (or a cause thereof) is apparently affecting the ooutcome AFTER the reboot. That suggests reboot's initialisation of the device state is incomplete.
04:22:04chrisjjBye for now.
04:27:51[Saint]Its always nice when people tell other people how clearly easy to fix something is.
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08:27:01wodzchrisjj: You know, patches are welcome. As a side note, I agree with pamaury here - the fact that behavior varies between units suggests timing issue.
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10:53:15wodzlebellium: do you have this firmware for YP-CP3? I might look into it how much it is different from ref design when I am bored with mips stuff
10:54:36lebelliumwodz: they should be all here:
10:54:47wodzok, thanks
10:54:58wodzthis player seems to be hard to get
10:55:40lebelliumwodz: it was only released in China and Russia. And I managed to convince the Product Manager to release it in France too.
10:56:17wodzis still it on stock?
10:57:02lebelliumNo, it's discontinued since 2010
10:59:41lebelliumThey stopped the production in April 2010
10:59:57lebelliumI just found old emails again
11:00:21lebellium'" * CP3 (end of production in Apr.)
11:00:24lebellium 1. Spelling error (Mirco SD Card ) > Will be fixed next firmware within this month.
11:00:25lebellium 2. Function for Video screen size > Cann't apply it in CP3 due to main chip performance. "
11:00:56lebelliumI just can't believe it. Is the rockships really so shitty that it can't handle video playback with the right screen ratio?!
11:01:36wodzHehe, as I stated earlier you should read 2) as 'Rockchip' didn't released enough specs for us and we are hesitant to push or to figure out ourselves
11:03:46wodzVideo decoding is done on ZSP500 dsp. This is quite a beast - 4-issue with tight loops support 1cycle mac and other goodies running at up to 150MHz
11:05:07wodzthere is also hw scaler integrated in lcdif and YUV<->lcd hw converter
11:05:58wodzThe point is that AFAIK decoders for dsp are shipped in binary form with SDK and lcdif part is poorly documented in datasheet
11:06:40wodzoh, and there is no free ZSP500 SDK nor toolchain (although AFAIK the one shipped by LSI is gcc based)
11:07:19lebelliumIt's a bit too technical for me :D
11:08:24wodzIf you are interested I can explain it better probably
11:12:06lebelliumis the RK27 port still in active development?
11:14:05wodzlebellium: That depends how do you define active development. I have a few half-finished things on the table, I poke here and there but the easy parts are done and the harder one need more time then I have
11:14:41lebelliumthe harder parts like NAND?
11:15:05wodzThe two big are USB and FTL
11:15:13wodzlowlevel nand is figured out
11:15:34wodzwell, mostly. I don't know how to use DMA but OF doesn't use it either
11:16:11lebelliumAh FTL.... pamaury and lorenzo have the same issue on imx233 I guess
11:16:44wodzAnd DSP is not used at all. I made it run small snippets of hand-assembled code during devcon in London but thats all
11:18:11wodzlebellium: There are 2 or 3 versions of FTL used on rk27xx depending on SDK version. I mostly understand how the version I have on my player works. I thing RO support is a matter of a week of free time.
11:20:02lebelliumRO support?
11:20:08wodzread only
11:20:36wodzWrites are done though some software implemented cache and this bit is unclear for me
11:25:41lebelliumfunny, hxediting the CP3 firmware file, I can read S.A.M.A.U.N.G. Samsung fail? :D
11:27:44mortalislebellium: On IHIFI firmware i found "fuck" string :P
11:28:21wodzthere is wide spread mistake where one field in nand struct is called 'vonder' instead of 'vendor'
11:28:52wodzmortalis: btw. how is your work on 'new bricks' going?
11:30:37mortaliswodz: That was easy. Sound works even with dummy_codec. LCD also works. Only minor things left - keymaps, battery curve, plugins.
11:31:20lebellium"C.o.n.n.e.c.t.e.d. .t.o. .T.V.-.o.u.t..." eh what TV-Out? There is none on CP3 :)
11:33:10wodzlebellium: Its leftover from SDK - some chips from rk27xx family have composite output
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11:48:14chrisjjwodz: "You know, patches are welcome". I didn't know that. I'd assumed that while this port is in hot beta, code changes best be left to Amaury. Please tell me if I'm wrong, pamaury.
11:49:25wodzchrisjj: We work collaboratively by definition. If you have a fix you will save pamaury's time for other things
11:50:19pamauryespecially since I have a lot of work and thus not so much time to hack
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11:57:12pamauryMaybe try to increase the spi delay
12:12:32pamauryactually you also try to delete it completely
12:25:06wodzpamaury: going through std_analyzers.cpp do I assume correctly that I have to name ClockAnalyzer class for rk27xx differently?
12:25:43pamauryactually it would make sense to rename the whole file std_analysers_imx233.cpp
12:25:56pamauryand create another one for rk27xx
12:26:07pamauryand rename the classes too
12:26:46pamaurythough for clocks, it would make sense to have a generic class to display the clock tree that you can specialise with target specific code to actually read the clocks
12:26:52wodzI recall vaguely there is some mechanism in c++ to trap class in particular namespace
12:26:58pamaurythis way you don't have to write the UI twice
12:27:13pamauryput everything in namespace Blabla { }
12:28:53wodzpamaury: Another thing - if you have register with defined fields (and values) in qeditor there is this part called Meaning. AFAIK it is always empty. From where it is supposed to get description?
12:29:49pamaurythe intended meaning was to read the value and it the desc file provides some named value, find out which one it is
12:30:03pamauryI don't know if I implemented it or not ^^
12:30:23wodzpamaury: every target names clocks differently and this are derived differently. I don't think there is easy way to generalize that
12:30:45pamauryyes you can, just have a look at it's done for the imx233
12:30:57wodzpamaury: ah, so it is supposed to work when inspecting reg dump, right?
12:31:25pamaurya clock tree is easy: you have nodes and when you derive from a parent, you can be on/off and have multiplier + divisor, that handles virtually all cases
12:31:25pamaurywodz: yeah
12:32:07pamauryoh actually I implemented it
12:32:17pamauryso it should work, but you have to provide named values
12:33:44wodzWill try to dive into it maybe. Not knowing c++ is the problem in my case :P
12:34:55pamauryyeah sorry for that, but writing GUI is just much simpler with Qt
12:35:38wodzI am not blaming you
12:35:50pamaurylearn c++, that's worth it I guess :)
12:36:11wodzI tried a few times and failed. I feel much stronger in asm world
12:37:35pamauryC++ is a terrible language anyway; there is much worse though so I still prefer to write code in C++ than in most other languages
12:39:22wodzpamaury: If I add class Rk27xxClockAnalyser derived from Analyser which will have SupportSoc() method acting properly on rk27xx in soc name will it just magically work?
12:39:51pamaurynot quite
12:40:12pamauryyou need to register it this way:
12:40:23pamaurystatic TmplAnalyserFactory< MyClockAnalyser > g_myclock_factory(true, "My Clock Analyser");
12:41:03wodzah, thats what it is for
12:41:15pamauryyeah ^^
12:43:23wodzpamaury: Did you build ui registered with analyzer by hand or with qtdesigner?
12:44:25pamauryby hand
12:45:48pamauryall the UI was made by hand
12:49:34wodzpamaury: How to load reg description file to hwstub_shell in order to call DUMPER.dump_all()
12:51:01wodzah pass it as an arg
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13:24:50lebelliumIs there some news about RButil v1.4 and RB 3.14 releases schedule?
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13:30:22lebelliumRButil 1.3.1 is now 1 years old
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15:04:59soapwhat needs added to RButil?
15:06:34lebelliumupdate the changelog :)
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20:04:02chrisjjpamaury: re the ZEN wrong colours side-issue,13462.msg221673.html#msg221673 I added a note suggesting the cause is spurious BGR mode.
20:05:57pamaurychrisjj: the problem is that I don't understand this bit: logical would tell I should set the opposite value but if I do, they the colours at inverted. But i've never ran into this issue of colours inversion since I've published the code. I take it as a sign that the init code has a timing problem and the lcd doesn't correctly interpret the commands
20:06:12pamaury*are inverted
20:07:29chrisjjpamaury: which value are you writing to this bit?
20:08:05pamauryhum, let me see
20:09:10pamauryI set the BGR bit
20:11:12pamauryI think the bit is simply misnamed: the doc says that 0 exchange R and B and 1 is bypass, so it's more a RGB bit than a BGR bit ^^
20:11:39copperI love it when you guys speak Engineer.
20:11:52copperIt's like music to my ears.
20:17:18chrisjjOK, so you are writing "1", meaning bypass (I agree with you about the misnaming!), meaning that provided you are sending in the order R, G, B, we should see correct colours.
20:18:02chrisjjI see two possible mechanisms of this failure.
20:20:21chrisjj#1 The BGR bit is initially "0" (invert), for some reason coded initialisation fails i.e. the BGR bit write does not occur, and so the unit is left with BGR "0", giving wrong colours.
20:23:02chrisjj#2 The BGR bit initialisation to "1" (bypass) succeeds, but the pixel data sequence transmission is faulty, containing a single additional or missing byte, causing the gun pattern to be shifted over the pixel boundary i.e. first byte missing: R1G1B1 R2G2B2 R3G3B3 -> G1B1R2 G2B2R3 G3B3R4.
20:25:09chrisjjI hope that #2 makes sense. I can't suggest what is the specific cause in our case, but I have seen it happen elsewhere, and you can see I think how it could be happening to us, esp. since we already suspect some timing sensitivity.
20:25:32pamaury#2 is very very unlikely, early in the port I had problem synchronisation the lcdif with the data stream so the display would shift randomly and the results were never wrongs colours: it was either a correct but shifting screen or a complete mess (depending on how bad the synchronisation was ^^). #1 is much more likely
20:26:10pamauryThe pixel data is sent by the lcd block whereas the init data is sent over bit-banged SPI. I very much trust the LCD block rather than the bit-banged SPI
20:27:33chrisjjOK, I hear you, but do consider that definitely a single BYTE addition/deletion will cause wrong colours, and a shift that would be too small to spot.
20:29:04n1swouldn't that screw up the individual pixel data completely?
20:29:13pamauryWell, maybe that would be possible but that would mean the hardware is broken then: the display is refresh 50 times per second, both the DMA and lcd block the number of bytes to send, if one byte was added every frame I think that would qualify as a serious hardware bug
20:30:10chrisjjNo it wouldn't screw up the individual pixel data completely.
20:30:16pamaurythat could be the case if we were doing partial refresh because then the number of bytes would not be a multiple of 2 and I've ran into issue with this previously. But here we refresh the entire screen so it's ok
20:31:03chrisjjNot necessarily a hardware bug. Last time I saw it, the cause was a software bug - an out-by-one error in the DMA block start register.
20:31:45chrisjjWhen I say "missing byte", I mean only missing in the sequence. The total number of bytes is unchanged becasue and extra one gets sent at the end.
20:31:56n1sin some players we have bumped into hardware bugs that the OF just didn't trigger
20:33:03chrisjjpamaury: re multiple of 2, I suggested a single byte but actually two bytes will have a very similar effect.
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20:33:11n1sright one color channel would end up slightly shifted in relation to the other two and all colors jumbled
20:33:19pamauryFurthermore, #1 would explain both colour problem and black screen
20:34:20chrisjjnis: Precisely. If we could pause on the start screen, we might see the shift.
20:35:34chrisjjpamaury: I agree #1 could cause both, but it would be just ask likely to hit the TB or SS bits in the same register, causing flip or mirror - and I have never seen either in the thousands of inits I have seen.
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21:20:32wodzchrisjj: pausing on start screen is as easy as adding while(1); in code
21:21:38wodzpamaury: Why do you init using bit-bang spi? Doesn't lcdif block have bypass mode to send commands to lcd? All lcdifs I saw have something like this.
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21:42:54SrRavenCan anyone recommend an portable amp?
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21:58:40chrisjjwodz: thanks, but I meant pause the existing code.
22:01:48chrisjjThe wiki says "When you want to save power, like when in USB mode, you call cpu_idle_mode():" Can anyone tell me why particularly USB mode?
22:03:16gevaertsWhere does it say that?
22:03:32gevaertsIt sounds like an old bit dating from the days of hardware USB-ATA bridges
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22:07:02gevaertsYes, hardware USB
22:07:19gevaertsWhere we do basically absolutely nothing until disconnect
22:08:37 Quit fs-bluebot (Ping timeout: 264 seconds)
22:09:02chrisjjAh, thanks. I suspected as much, on seeing nearby "the USB thread grants the USB chip control of the hard drive" :)
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22:10:38chrisjjHas anyone given thought as to how in general such documentation issues are to be dealt with going forward?
22:14:42chrisjjHow to kill the mood at a programmers' party: mention documentation! :)
22:20:50wodzchrisjj: The documentation IS good thing we know and we are definitely lacking in this area.
22:32:45lorenzo92defintely, chrisjj, haha
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22:33:17lorenzo92about this topic, I was wondering these days about drawing some diagrams
22:34:22lorenzo92as well as commenting more the crucial functions...
22:44:56pamaurychrisjj: I use bit bang SPI because there is no other way, the SPI bus is not shared with the other lcd lines
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22:56:45wodzpamaury: that was my question actually
22:57:31pamauryah sorry, misread :)
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23:27:30chrisjjDiagrams would be good, but the possible more important thing is the question of where to put them... Anyway, back to code :)
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23:49:20chrisjjSorry, that must have come over as rude. I meant I must get back to code here. I'd really like to talk about RB documentation next time. Thanks.
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