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#rockbox log for 2013-01-19

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13:08:16pamaurylorenzo92 (logs): after some research, it appears that the bcm2070 is only a bluetooth chip, it doesn't have any integrated fm tuner :-:
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15:17:28gevaerts[Saint]: I don't understand http://forums.rockbox.org/index.php/topic,42636.msg217012.html#msg217012
15:21:41[Saint]gevaerts: it was me saying that the idea of primary/secondary is basically irrelevant.
15:21:58soapThat's true for iPods as they sleep (most the time) and thus never see the RB bootloader...
15:22:07soapIt's true for Sandisk players as well?
15:22:13[Saint]Even if he rarely uses Rockbox, he need only to boot into the OF and it will do so forevermore until he desires it not do so.
15:22:24gevaertsWill it?
15:22:34gevaertsIs the fuze+ that different from all other targets?
15:23:35[Saint]Oh...hum. Ah, whoops.
15:24:02[Saint]Seems I was looking at this from an iPod-ish POV, and apparently my available Sansas don't have HEAD bootloaders. Shit.
15:24:37[Saint]Where the shit did delete go?
15:26:34[Saint]Does someone else want to send that post to the trash can? Apparently that feature never made it through the migration.
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15:26:45[Saint]Please and ta.
15:26:56AlexPYou don't see the remove button?
15:27:08*gevaerts clicks remove
15:27:10AlexPNext to quote/modify?
15:27:27[Saint]Nope. Must be a priveledged user thing.
15:27:41AlexPgevaerts: Users should see it on their own post though no? Maybe if nobody has replied yet they should
15:27:46[Saint]privileged too
15:27:54gevaertsNo idea
15:28:31[Saint]AlexP: well, it isn't there on threads people have replied on, either.
15:28:39[Saint](for me)
15:28:47AlexP[Saint]: Sure, but I tend to think that is correct
15:29:02AlexPAs I don't want users deleting stuff that people have replied to
15:29:07AlexPA mod always can of course
15:29:21[Saint]Ah, nevermind. I misread your post.
15:29:24AlexPBut if nobody has replied, I think a user should be able to delete their own posts
15:29:35[Saint]The /old/ forum let me delete posts regardless, iirc.
15:30:21AlexPI ask gevaerts as he is an admin, which I'm not so I can't see if stuff like that can be anabled trivially :)
15:30:40gevaertsOh, right
15:30:51gevaertsYou used to be more powerful than me :)
15:31:07AlexPI've languished while you have powered forward :)
15:31:09[Saint]Now he's just a lowly blue guy. :)
15:31:09*gevaerts had forgotten he's an admin these days
15:33:46gevaertsI don't see a setting for "delete if nobody replied"
15:34:41AlexPNo worries then
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15:42:58bjacquesHello, I accidentally deleted the partition(s) on my iRiver H120 running Rockbox. I would like to setup a new partitioning scheme that will make Rockbox happy. How should I partition the drive, and what files are required to be present?
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15:44:55pamaurywhy does that guy on the forum wants to keep rockbox on the fuze+ if he doesn't use it ? We could add a setting but is that worth it ?
15:44:58gevaertsbjacques: you need a FAT32 partition with the .rockbox directory (and contents) on it
15:49:33bjacquesgevaerts: I have created one large FAT32 partition and used the Rockbox utility to install an .rockbox directory. Now my Iriver says "No partition found. Insert USB cable and fix it"
15:50:17bjacquesgevaerts: if it helps you to know, I used gnome-disk-utility to create the partition
15:50:51gevaertsbjacques: can you run "sfdisk -l /dev/sdwhatever" on it, and pastenbin the output?
15:52:21bjacquesgevaerts: http://pastebin.com/rqkVh9Rb
15:52:33bjacqueslooks a bit odd to me
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15:52:52bjacquesperhaps I should repartition with fdisk instead
15:53:13gevaertsRight. That partition has type 83. Rockbox wants 0b or 0c
15:53:19gevaertsTry just changing the type
15:53:34***Saving seen data "./dancer.seen"
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15:54:19gevaertslinux doesn't care about those types, so you can easily have a "linux" partition with FAT on it, but for various reasons that were before my time, we're picky :)
15:55:01bjacquesgevaerts: that did the trick. Thanks!
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15:55:52gevaertsGood!
15:56:09lorenzo92pamaury: indeed, I have finally saw that it is a SI4709, the same as for R0 so we are lucky ;)
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15:57:08pamaurybertrik: ping
15:57:19bertrikpamaury: pong
15:57:42pamaurydo you still have the dri code you tried on the zenxfi3 ? You have sent to me but I can't find it anymore
15:58:46bertrikyes, I still have it, but I don't have it with me right now, I'll be back home sunday night
15:59:33pamauryah no that's fine, I found it, crazy me, I overlooked the only place where it could reasonably be
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18:37:53[Saint]Is Rockbox expected to handle *really* foolishly large mp3 files?
18:38:02[Saint]Like 2GB+ kinda large?
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18:45:32funmanwell is file size signed or not?
18:46:10[Saint]I have no idea, and I expect if I asked OP she wouldn't either.
18:46:28[Saint]I've been trying to push him/her in here to no avail.
18:47:19funman'long size'
18:47:33funmanso 2GB+ looks unsupported
18:47:56funmanin firmware/common/file.c (struct filedesc)
18:48:44n1syeah iirc >2GB files don't play
18:48:45[Saint]what is the cutoff limit?
18:48:52*[Saint] bad at math is
18:48:57n1sshould be 2GB
18:49:48n1sas that should fit nicely in a signed 32 bit int/long
18:51:35*[Saint] should stop caring.
18:51:46n1sthat's the easiest way
18:51:48[Saint]*my* files play fine, and, I'm in the right channels :)
18:52:39n1sif the core was fixed to handle files larger than 2GB, i guess some codecs would need fixing too
18:56:05[Saint]<speculation hat> IS optimization based on the fact this won't happen?
18:56:33[Saint](which would be a reasonably sane assumption, I thought, until I met this user)
18:57:08AlexPWhat is our FAT32 filesize limit?
18:57:32AlexPI know FAT32 is 4 GB, but I seem to remember e.g. old linux having 2GB as the limit
18:57:34[Saint]Do we have a different one than the general one?
18:57:43AlexPdue to using signed integers or somesuch
18:58:03AlexPI'd assume ours is 4GB, but you never know
18:58:35[Saint]I'm pretty confident I've stored/moved around files greater than 2GB with the file browser.
18:58:51[Saint]not 100%, but...up there in the 90s
18:59:25n1si *think* rb si fine with having 4GB files in the fs, they just don't play again i *think* and i guess other file operations won't be working well on the either
19:00
19:00:08[Saint]The guy/gal seeing this problem with his/her media isn't biting and taking the hint to come in here, so I officially don't give a rodents hind appendage anymore :)
19:18:43*gevaerts thinks funman's answer is authoritative here
19:25:48nxshello..
19:27:17nxsi have a freezing problem with my classic 6g
19:27:20[Saint]Oh, wow...apparently my client is doing that "not show me certain events" thing again. Didn't see you come in and was lamenting the fact.
19:28:15[Saint]according to the nicks list, you're not here. Reboot time. :)
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19:30:51nxsthis freezing also happened before i put in the biggest files
19:47:34gevaertsnxs: which rockbox revision are you running?
19:53:39***Saving seen data "./dancer.seen"
19:56:39nxsthe latest version..
19:56:56 Quit Dex ()
19:57:10nxsi have installed and downloaded the latest files today
19:57:40nxsit's the 130118 version
19:58:05gevaertsok
19:58:22pamaurybertrik (logs): I have radio sound with stfm1000 ! Apparently the bugs were mine: crazy things in dri code
19:58:36*gevaerts asks because the version packaged with emcore has known stability issues
19:58:52pamaurythere still are some problems though
19:59:08TheSevenyou were actually able to copy files using a recent rockbox build on a classic?
19:59:15nxsthis happened with the emcore pakkage version but also with the latest
19:59:35[Saint]TheSeven: I do so regularly
19:59:45[Saint]About 2 minutes ago, in fact.
20:00
20:01:07KatuDoes anyone else have issues copying files to rockbox using front panel USB?
20:01:41gevaertsKatu: which player?
20:01:49KatuiPod Photo
20:02:01[Saint]Front USB ports tend to be quite shoddily made on some PCs
20:02:33nxsuse a laptop ;-)
20:02:37[Saint]If it works with a rear port, I'd say the problem is the host.
20:02:39CinosI had issues with rockbox crashing when I used it on a certain computer (it was a laptop)
20:02:48KatuThat's about what I suspected. Both my computers refuse to copy to the iPod with FP USB, but as soon as I hook to the back panel, works perfectly
20:02:51Cinosonly happened half of the time though
20:02:58gevaerts[Saint]: yes, but it's also a fact that the OF often handles them better
20:03:11Cinosand it seemed to work fine when I updated and intialized the database immediately before trying
20:03:15Katunxs: Can't use a laptop if I don't own one haha
20:03:23*Cinos tosses Katu one of his
20:03:27Cinos:p
20:03:30Katu:P
20:03:35CinosI only have 3
20:03:36nxsbuy one
20:03:39gevaertsipod photo is ARC, which is reasonably stable, but yes, there have been cases of it not working well (/me remembers amiconn's hub of horror...)
20:03:44CinosI'll give you one for $40
20:03:54Cinos:PP
20:03:58Katuhahaha
20:04:03CinosEven that's a ripoff
20:04:05Cinosit really sucks
20:04:10nxsi have a macbook and 2 working winxp laptops
20:04:12*gevaerts points out that this off-topic chatter doesn't help
20:04:23nxsok sorry
20:04:28*[Saint] jams his Color is a font USB port
20:04:29CinosI have 1 winxp laptop and 2 win7 laptops
20:04:34Cinos:3
20:04:41*Cinos goes back to idling
20:06:39KatuAre USB hubs equally unreliable? One of my computers, I can't easily reach the cable while it plugs into the back panel, so I was considering a little 4 port USB hub to bring it to a more easily accessible location
20:07:16nxsare there more who have this freezing problem?
20:07:38[Saint]some front ports dont supply enough power from my experience.
20:08:07[Saint]I'm poking at my desktop now, but I built this thing, and I know it works, so there's little point in me doing so unfortunately.
20:08:12gevaertsKatu: hard to say. The hubs I have never gave me issues, but I know of at least one our driver used to have issues with. Maybe those got solved magically since then, but...
20:08:31KatuAhh, gotcha. Makes sense
20:08:58gevaertsnxs: what exactly happens? Does it freeze randomly, or does it happen when you do certain specific things?
20:09:11 Quit GodEater (Ping timeout: 264 seconds)
20:09:20nxsonly when playing mp3's
20:09:27KatuSaint: Yeah, both of these computers are home-built as well, which is what surprises me. Especially since one of them is an Antec case, which I have always really liked as a brand due to the better than average build quality
20:09:32nxsfile size does not matter
20:10:09KatuOr is it more in the motherboard than the case?
20:10:17gevaertsnxs: do you also use other codecs (ogg, flac, ...)? If so, are those stable?
20:10:27 Join GodEater [0] (~bibble@rockbox/staff/GodEater)
20:11:21nxsno, but i could try but i would have to search very good for ogg files, i don't have flac's
20:11:35gevaertsok, so it could be general playback
20:11:50[Saint]I have the same model, same build.
20:11:53[Saint]Fine here.
20:12:06nxsplaying mp3's right?
20:12:11[Saint]Correct.
20:12:15*gevaerts decides to ask some random things that sometimes cause random issues
20:12:23gevaertsHave you checked the filesystem?
20:12:51nxsnot yet..
20:13:21 Quit n1s (Read error: Connection timed out)
20:15:38gevaertsThat's always a good start
20:19:04nxschecking should be done with the computer right?? Does not work..
20:19:57[Saint]I assure you it does work.
20:20:14[Saint]Perhaps you might try defining 'Does not work" so we can see what you're doing wrong.
20:21:34nxsi have selected the ipodclassic drive in explorer
20:22:20nxsand started the disk check program
20:24:32[Saint]...is that the end? Are we still waiting for more or is that it?
20:24:58nxserror message is "Cannot complete the disk check"
20:25:13[Saint]Oh dear.
20:25:25nxssorry i had to translate it from dutch:-P
20:25:33[Saint]Well, I think we found our problem.
20:25:58 Part bjacques
20:26:27gevaertsThat could be a bad disk or USB stack instability, I guess
20:26:27[Saint]Do you have the media on the device backed up?
20:26:34nxsplease tell me
20:27:02nxsbacked up? Am i going to loose it all?
20:28:32[Saint]It is highly possible that you may lose some or all of it recovering the disk, yes.
20:28:48gevaerts*never* assume a portable device is a good place to store your only copy of a file...
20:29:21gevaertsThose things can be fragile at times. They're small enough to easily drop, or to lose in some way...
20:29:38gevaertsSo if you don't have backups, make them *now*
20:30:26nxsmusic is on the computer so are all rockbox files..
20:31:00gevaertsok, so nothing can be lost apart from time
20:31:27[Saint]If you are certain of that, the easiest course of action from here it to format the data partition.
20:31:37[Saint]This can be done from emCORE's Tools menu.
20:32:04nxsok...
20:32:19[Saint]Make sure your device has external power during this process.
20:32:29[Saint]You don't really want it to fail during it.
20:32:47nxsand then i lose all rockbox and music files on the player? what about emcore itself?
20:33:19[Saint]emCORE will be fine.
20:33:44TheSevengevaerts, [Saint]: I've seen windows 7 checkdisk refuse to check usb drives for no apparent reason before (or even crash with weird error messages before actually checking something)
20:34:00nxsok.. format the thing and after that i only have to copy all files back? is that all?
20:34:12[Saint]TheSeven: feel free to take over.
20:34:33nxsi'm using xp btw
20:34:37TheSevennah, don't have time for that :P
20:34:59TheSeven[Saint]: formatting from emcore should take seconds, usually no need for external power if the battery isn't all the way dead
20:35:43[Saint]nxs: boot into emCORE, select the "Tools" menu, then select "Reformat data partition"
20:35:48[Saint]tell me when it is done.
20:35:59TheSevenI just meant to say that I wouldn't be too worried if windows checkdisk acts up... I've seen that before, especially on ipods
20:36:04nxsi have installed everything 2 days ago.. the install of emcore was including formatting the drive..
20:36:05TheSevenpossibly related to the 4K sector size
20:36:45[Saint]nxs: that doesn't necessarily mean the filesystem wasn't corrupted since then.
20:36:58nxsok.. i'll try
20:36:58[Saint]Especially if you don't eject the device properly.
20:37:17[Saint]...but, feel free to not do anything and live with your problems so I can eat lunch if you want.
20:37:26[Saint]:)
20:37:52nxswhat time is it? is it morning for you?
20:45:58TheSevenfor [Saint], yes. new zealand...
20:45:59nxsok.. usb connection is working again;-)
20:46:10TheSevenI'm on the opposite side of the globe
20:46:39*[Saint] feels like he missed a lot of things.
20:46:58[Saint]Am I to assume you bluffed your way through installing a new build via the fallback image?
20:47:54nxsyes...
20:48:01[Saint]Awesome.
20:48:37nxsgoodthing right?
20:49:13 Join enriched [0] (~quassel@101.98.163.139)
20:49:22[Saint]It is, yes.
20:49:27 Quit hype (Quit: ["Textual IRC Client: www.textualapp.com"])
20:49:43nxsok, now started copying music files...
20:49:53[Saint]If you haven't been doing so, remember to always "safely remove" your device.
20:50:01nxsi hope thit solves the problem..
20:50:27 Join hype [0] (~hype@82.199.174.16)
20:50:32[Saint]Not doing so is one of the major causes of filesystem errors. So when possible, always safely remove the device.
20:51:28nxsmy other ipod has no issues
20:51:48nxsit's still using it's original firmware
20:51:48[Saint]That doesn't mean you shouldn;t do it.
20:52:03[Saint]One should always safely remove a removable device.
20:53:11nxsi know
20:54:15nxspff... only 7% done yet...
20:56:20 Join TheSphinX^ [0] (~briehl@p579CCC9D.dip.t-dialin.net)
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21:00
21:03:59 Quit pretty_f_ (Remote host closed the connection)
21:10:45pamaurysomeone has ever done fm radio demodulation and understand how it works ? and knows how RDS works on top of that ?
21:11:34[Saint]bertrik is "The RDS guy" iirc.
21:13:06pamauryyeah but we are not talking about the "binary" side of it, i'm speaking about the "signal theory" one
21:13:18pamaurybertrik and I are working on a crazy tuner for rockbox
21:14:35pamauryif you prefer, i'm trying to understand the all words in "The RDS signal is a BPSK-modulated, differentially-encoded 1187.5 bits-per-second data stream. The 1187.5bps rate is one-sixteenth of the
21:14:35pamaurypilot tone's 19kHz"
21:19:38 Join saratoga [0] (123e0c9c@gateway/web/freenode/ip.18.62.12.156)
21:20:03saratogaIIUC, every 16 cycles the phase of the tone can flip
21:20:08saratogathat gives you a binary 1 or 0
21:21:29 Join lebellium_ [0] (~chatzilla@lns-c10k-ld-02-m-212-194-176-149.dsl.sta.abo.bbox.fr)
21:21:30pamauryok, I understand that part of the theory, in practice though I have two problems: 1) how do you implement that ? 2) what the hell does this tuner chip gives as rds signal ?! We don't have the datasheet
21:22:32saratogai assume the tuner chip is decoding everything for you
21:22:37saratogadoing that in software would be strange
21:22:50pamauryI agree but no choice here
21:22:53saratogain hardware its probably just a multiplier and a comparator
21:23:09pamauryand if I understand correctly I need the phase of the carrier to correctly decode ?
21:23:14 Quit lebellium (Ping timeout: 260 seconds)
21:23:15saratogayeah
21:23:23saratogaoh you want to try and implement this for a chip without hardware?
21:23:24 Nick lebellium_ is now known as lebellium (~chatzilla@lns-c10k-ld-02-m-212-194-176-149.dsl.sta.abo.bbox.fr)
21:23:34saratogai guess using the FM line in?
21:24:11pamaurythe chip gives does only the fm demodulation and gives 4 multiplexed signal already in digital form: L+R, L-R, RSSI, RDS
21:24:20pamaury*-does
21:24:37saratogaso the RDS will be a high frequency signal riding on the demodulated FM?
21:26:29saratogawikipedia says " RBDS/RDS subcarrier was set to the third harmonic of the 19 kHz FM stereo pilot tone " which would imply that you woudln't be able to get the RDS signal from the demodulated L/R signals
21:26:49pamauryno each channel (L+R,L-R,RDS) is decoded and sampled, so I think the chip basically gives the signal you would have *before* doing the fm modulation. So RDS looks like a 1197Hz signal
21:27:00pamaurythe three signals
21:27:08pamauryI'm not sure if I'm clear, that's so strange
21:27:10saratogaah ok
21:27:28saratogaso basically it multiplies the incoming FM signal by 19*3 kHz and gives you the result?
21:28:13pamauryiirc, yes
21:28:23pamaurybut I don't have the datasheet so I can't be sure
21:28:48saratogai would try to record some of what its giving you and then plot it
21:30:20saratoga1197 bits per second will be a couple khz worth of bandwdith, so you'll probably see some sin wave flipping every couple cycles if its BPSK and i understand correctly
21:31:55pamauryso now, I can decode this in software ?
21:31:55pamaury*how can I
21:31:56 Quit pamaury (Quit: No Ping reply in 180 seconds.)
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21:35:51Saratoga_the basic idea is to cross correlation by it by the two phases
21:36:11Saratoga_phone keyboard
21:37:14 Quit lebellium (Ping timeout: 260 seconds)
21:37:14Saratoga_I would check Google there's probably tons of example code for this
21:37:26 Nick lebellium_ is now known as lebellium (~chatzilla@lns-c10k-ld-02-m-212-194-176-149.dsl.sta.abo.bbox.fr)
21:37:36*pamaury needs to learn what cross correlation means
21:39:14pamauryI recorded the rds signal by output it instead of L/R then recording using my laptop
21:39:38TheSevenwhat does the result look like?
21:39:46Saratoga_Can you post it?
21:40:54pamauryI'll post it, be patient, the internet connection here is pretty bad
21:41:28Saratoga_Basically cross correlation means multiply sum the two waveforms, if they are in phase they sum to high if not they sum to 0
21:42:06pamauryok
21:42:06Saratoga_it's a dot product in calculus
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21:45:18pamauryhttps://www.dropbox.com/s/45u1nwofzxm4m7m/rds.ogg
21:46:01pamauryit's in ogg but the quality looks good enough
21:46:36Saratoga_Does Ogg preserve the phase?
21:48:22pamauryI'm not sure I understand the question
21:50:46saratogapeople are insensitive to phase of pure tones, so i'm curious if ogg bothers to encode it
21:53:10pamauryIn audacity the signal looks the same in raw format and with ogg, not sure if that helps
21:53:22 Quit Saratoga_ (Ping timeout: 245 seconds)
21:53:40pamauryI can upload the complete one but it's 10 times bigger ^^
21:53:41***Saving seen data "./dancer.seen"
21:54:10saratogaif it looks the same then its fine
21:54:45pamauryI'm uploading the wav file, will finish soon
21:54:56saratogayou can drop the second channel and downsample to 16khz
21:55:05saratogathat will probably give you a smaller file then even ogg
21:56:01pamauryok, let me try that
21:56:57saratogaalthough 22k might be safer then 16 k
22:00
22:00:54pamaurythe result is not great when downsampling
22:01:57pamauryperhaps the signal is noisy
22:04:38pamaurysaratoga: https://www.dropbox.com/s/ncei6f050q311tc/rds.flac
22:06:46pamauryat this point i'm not a 100% percent that this signal is correct of course, we might be missing some init somewhere in the tuner
22:06:48saratogatheres a lot of harmonics
22:06:53saratogaso it will look weird downsampled
22:08:57saratogaso i guess looking at this signal, the 6khz tone is the carrier
22:09:16pamauryok, I might be missing an enable bit in the tuner
22:11:16pamauryhum, at least it seems that the rds enable bit is set
22:14:09pamaurysaratoga: does this signal looks legit to you ?
22:16:37saratogai'm not sure
22:16:46saratogai don't know too much about this, aside from the basic theory
22:17:10saratogai extracted the carrier and then tried using it to demodulate the signal but i'm not getting anywhere yet
22:18:28 Join TheSphinX_ [0] (~briehl@p579CCD13.dip.t-dialin.net)
22:19:16pamauryhum, I'm pretty pessimistic: the output is same with rds enabled and disabled :-/
22:19:57saratogaah ok
22:20:13pamaurylooks the same at least
22:20:57 Quit TheSphinX^ (Ping timeout: 240 seconds)
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22:21:27pamaurythere is a linux driver for this chip but when you see the code, you want to cry
22:22:16saratogahttps://cgran.org/wiki/RDS
22:22:21saratogadiagram of how it works
22:22:45pamauryyeah I know this diagram, I've stumbled upon it during my research
22:22:58 Quit y4n (Quit: Today is the perfect day for a perfect day.)
22:22:59pamaurybut it doesn't make it "more practical"
22:23:20 Quit TheSphinX_ (Ping timeout: 245 seconds)
22:23:34saratogait suggests what the chip would give us though
22:23:43pamauryyeah
22:23:58saratogaprobably the output of the 57+-3khz BPF
22:24:03pamaurywell the chip definitely doesn't do the 1.5KHz low pass filter
22:26:07pamauryanyway this chip is so low-level, the entire linux drivers counts thousands of lines
22:26:45saratogawhats the chip?
22:26:50pamaurythe rds "analog" decoding is 600 lines of C, and the stereo blending+filtering is 800 lines
22:26:52pamaurystfm1000
22:29:27pamauryi'm not sure if it's in the linux trunk though, it might only be in the linux port for imx that I have
22:33:11saratogademod_loop in stfm1000-rds.c is basically a string of digital filters that back out the phase of each segment and then use the decoded data to parse the RDS packets
22:36:52saratogai think if that function were unrolled so that it didn't need to be run in real time i'd be a couple for loops and then a normal bitstream parser type function, but since its run in realtime its all messy
22:52:22 Quit bertrik (Ping timeout: 252 seconds)
22:58:02pamauryok good news: the chip sends L+R, L-R, rssi and RDS. The RSSI is an encoded float and I checked: it is consistent with the global rssi value given by i2c and seems consistent with the reception
22:59:39amiconngevaerts: Afaik rockbox doesn't care about partition type either; the only thing it doesn't handle is extended partitions
23:00
23:00:00gevaertsamiconn: it does. disk.c has a list of accepted types
23:00:25amiconnHmm, then it probably changed at some point
23:00:56pamaurythis means one thing: the 4 integer are correctly ordered so the RDS data is the RDS signal. And RDS is enabeld so it should be correct. So this signal must be correct or I'm completely missing something
23:01:49amiconngevaerts: Hmm, maybe the usb problems on PP are related to the cache invalidation problem (and fix) kugel linked to yesterday?
23:02:43gevaertshmm
23:02:53*gevaerts doesn't know much about such things
23:03:15*amiconn still has that hub, btw
23:03:16 Quit nateloaf (Quit: Leaving.)
23:09:39 Quit akaWolf (Ping timeout: 256 seconds)
23:11:16pamaurysaratoga: the poor quality of the rds signal might due to some dma issues, I fixed the buffering scheme and the audio quality is much better
23:21:47 Quit kevku (Ping timeout: 264 seconds)
23:22:20 Quit ParkerR (Excess Flood)
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23:26:19 Join ParkerR [0] (ParkerR@unaffiliated/parkerr)
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23:44:52pamaurysaratoga: ok, this is a bit tricky: in fact the input rds stream is not at 44.1kS/s, it's at 38 kS/s, so magic samples are set to 0x7fff to ignore them !
23:47:22saratogapamaury: ?
23:48:48pamauryanyway, here is the real rds data (I logged it directly from rockbox and dropped the invalid samples): https://www.dropbox.com/s/ncei6f050q311tc/rds.flac
23:51:10saratogaso the bandwidth of that file is about 2khz, which makes more sense
23:52:37saratogathats not demodulated
23:52:42saratogaare you sure its sampled fast enough?
23:53:40pamauryit's the raw data
23:53:44***Saving seen data "./dancer.seen"
23:54:20saratogahow was it produced?
23:54:33saratogathe chip itself sampled it and you digitally extracted it?
23:54:47 Quit kevku (Ping timeout: 264 seconds)
23:54:49saratogai ask because it looks like it has frequencies up to the Nyquist limit, and so may be aliased
23:54:52pamaurythe chip samples it and send the pcm data directly
23:55:05saratogaah ok
23:55:10saratogaso they probably critically sampled it
23:55:19saratogawhich is why they picked an odd sample rate
23:55:39pamauryit sends a stream at 44.1kS/s and when I drop the the invalid samples, the frequency drops to exactly 38kS/S, which is the one mention in the manual. So the data must be correct
23:56:21gevaertsYou're sure the station has rds?
23:56:29pamauryyes
23:56:38pamauryI checked with the fuze+ !
23:56:47gevaertsGood idea :)
23:57:25pamauryand the signal is of very good quality
23:57:39pamauryso all the ingredients are present to have good rds data in theory
23:58:20pamauryI wonder how you can make sense of it, it seems 0 nearly all the time

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