#linux-sunxi on 2015-07-24 — irc logs at freenode.irclog.whitequark.org

2015-02-18 19:37 Turl changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi

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01:14 <kdubious> Any way to get 256xfs MCLK from an A20?

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07:20 <sunxi_fan1> kdubious: are you talking about I2S interface?

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12:33 <sunxi_fan1> hola, finally i'm listening some good Supertramp tunes from the mainline kernel with simple-audio-card and my A20->I2S-DAI driver toward the UDA1380-Codec..

12:33 <plaes> ooh.. nice

12:33 <sunxi_fan1> it's been quite a tour..

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12:34 <sunxi_fan1> i've updated the gist here: https://gist.github.com/aventuri/c40d08b946b0d1da5081

12:34 <sunxi_fan1> still rough, many corner cases are still not matched. but at least 48K/44k1 16bit signed stereo Little endian work ok!

12:35 <sunxi_fan1> they are the 99% of digital music i.e.! :-)

12:35 <sunxi_fan1> but of course, with less stress, i'll try to polish the driver and fill the "blanks"!

12:35 <sunxi_fan1> summer i's starting

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14:10 <wingrime> moin!

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15:21 <dodo_> Hi. I have installed Debian Jessie 8.1 from directly from debian servers in a cubieboard A20. It doesn't have audio because i'm using the kernel from debian. Can I use the kernel & modules from the official ISO image (a Debian Wheezy 7.6) released from cubietech in Jessie??

15:22 <dodo_> I just need audio, no hdmi.

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15:29 <sunxi_fan1> dodo_: you mean "analog audio" from the audio jack, i suppose..

15:30 <dodo_> sunxi_fan1: yes

15:31 <dodo_> I need audio input and output, with jackd

15:34 <sunxi_fan1> in that case, you'll need the mainline kernel from "linux-wip" tree here: https://github.com/jwrdegoede/linux-sunxi/tree/sunxi-wip

15:36 <dodo_> sunxi_fan1: Ok. I will download it.

15:37 <dodo_> sunxi_fan1: by the way, can I still use the kernel & modules from the official .img released from cubietech?

15:41 <sunxi_fan1> sorry, but you'll need to setup a "new kernel", the one i pointed you to.. because the "codec" module (that's the name of the analog audio driver for A10/A20) is available only there..

15:42 <sunxi_fan1> so you'll need to use its modules..

15:43 <dodo_> ok. thanks :)

15:43 <dodo_> i will try sunxi-wip

15:44 <sunxi_fan1> and you'll need to put in place the compliant "device tree" file, because there's also that part to be configured for analog audio. that means it could be a matter of tweaking the "uboot" script too.. :-)

15:47 <sunxi_fan1> check the difference between "cubietruck" where the codec entry is there:

15:47 <sunxi_fan1> https://github.com/jwrdegoede/linux-sunxi/blob/sunxi-wip/arch/arm/boot/dts/sun7i-a20-cubietruck.dts

15:48 <sunxi_fan1> and a20-cubieboard where theresn't

15:48 <sunxi_fan1> https://github.com/jwrdegoede/linux-sunxi/blob/sunxi-wip/arch/arm/boot/dts/sun7i-a20-cubieboard2.dts

15:52 <dodo_> ok thanks

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16:48 <bgola> hello! by any chance is anyone using the LED driver PCA9685 with sunxi-3.4 kernel ? :)

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16:50 <bgola> the kernel driver was added in linux-3.10 and depends on the pwm framework (added in 3.5)

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17:04 <philectro> salut

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20:39 <kdubious> Any idea how to get 256xfs MCLK on I2S from an A20?

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21:19 <sunxi_fan> kdubious: are you talking about mainline or sunxi-legacy 3.4 kernel?

21:23 <kdubious> Hi sunxi_fan. 3.4

21:23 <kdubious> I've been using dan-and & nikkov

21:24 <kdubious> I do not have a scope

21:24 <kdubious> but, it looks like there is a MCLK signal on 44.1 & 48

21:24 <kdubious> and it looks like the signal is NOT 256xfs

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21:32 <sunxi_fan> for 3.4 i can't really help you because i'm working on mainline 4.x.. BUT i can tell you that you should just "check" (i.e. add a printk) the MCLK DIV register.

21:34 <sunxi_fan> if, as it is, the clk source from PLL2 is 24.576.000Hz for a 48KHz fs, that means a 512xfs and so, if your MCLK DIV is 2 (as it's in my case on mainline..) that bring a 256xfs

21:36 <sunxi_fan> that is a circa 12MHz square wave. i connected the "cheapo" 60MHz scope on my Olimex A20 SOM EVB and it was indeed more a triangle wave then a square one.. :-) maybe there were some capacitive effects in the cable!

21:38 <kdubious> the kernel prints:

21:39 <kdubious> get_clock_divder_master: rate=(48000), mclk_div=(2), mpll=(0), bclk_div=(4), mult_fs=(256)

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21:46 <sunxi_fan> the mclk_div looks ok to me.. which "feeling" do you have?

21:48 <kdubious> Sad, angry, confused feelings...

21:48 <kdubious> I don;t have a scope, so I can't tell if things are good

21:49 <kdubious> my multimeter shows me a signal during playback (~800mV DC), on each I2S pin

21:49 <kdubious> I'm trying to connect to an Audio Alchemy DAC that requires 256xfs MCLK + the other 3 I2S lines

21:49 <kdubious> the front display of the DAC always reads:

21:50 <kdubious> PLL INVALID

21:54 <kdubious> my "cables" are .5 meters

21:54 <kdubious> is that too long?

21:54 <kdubious> do I need resistors in the lines?

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22:00 <sunxi_fan> umh. 0.5m is quite long, indeed. I2S is supposed to be a bus for PCB, very few cm of traces...

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22:02 <sunxi_fan> of course, yo cant make a fast test with a "very" shorter cable. do you?

22:03 <kdubious> I'll try to make something a few cm, and work outside of a chassis

22:04 <sunxi_fan> then, thinking "out of the box", i can tell you the codec i'm using for my test, a low cost UDA1380 breakout board.., can work also WITHOUT the MCLK because can synth with an internal PLL the local system clock out of the "left right" clock! doh.. quite effective for saving a highly oscillating wire as the MCLK

22:04 <sunxi_fan> i don't know your alchemi DAC (if you have a pointer.. we can read about it) but maybe it has "modes" where the MCLK is not needed!

22:06 <kdubious> I've been speaking to the DAC designer. It requires the MCLK

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22:06 <sunxi_fan> and maybe some 470ohm resistor in series could reduce the spikes, if you have them handy, a trial could be time well spent.

22:06 <sunxi_fan> OTOH the "mean" measure of tension with the multimeter is not very significative, of course..

22:07 <kdubious> with the multi-meter, all I can really do is tell if the clock is running, I think

22:08 <kdubious> so i don;t think MCLK runs for 88.2 & 96

22:08 <kdubious> but I "see" it run on 44.1 & 48

22:09 <kdubious> ok, off to create a shorter connector

22:10 <kdubious> thanks, sunxi_fan

22:13 <sunxi_fan> you are talking about this "badass" ! ;-) http://static1.squarespace.com/static/546830e1e4b0261a3b0036f1/5484a9a6e4b0035e1ef56841/5518d4f8e4b039970f257253/1427690745233/DDP-1_back.jpg

22:13 <sunxi_fan> with that I2S link in a PS2 connector?

22:13 <kdubious> yes

22:14 <kdubious> that's it

22:14 <sunxi_fan> you are playing in completely another league then my codec! :-)

22:14 <kdubious> think I should plug an old mouse into it?

22:21 <sunxi_fan> with the tag slight shaving off the 2K, i suppose they could get there and make the integration for you! :-)

22:21 <sunxi_fan> you'll need really to "cut" a cable from a dusty mouse in the drawer, to find the right jack..

22:21 <sunxi_fan> which devices are supposed to be compliant with that fancy I2S connector?

22:25 <kdubious> Sorry, I was soldering

22:25 <kdubious> well... no devices are compliant

22:25 <sunxi_fan> maybe this info can lead you to the right expectation about cable length..

22:25 <kdubious> so, here I am, making them a "server" that will connect to their I2S

22:26 <kdubious> http://musicapristina.com/

22:26 <kdubious> that's my company

22:26 <kdubious> I have the connector, almost ready to test with a 10cm "cable"

22:26 <sunxi_fan> let me tell you an "el cheapo" A20 on top of this beast will be pretty "ridicoulous"! ;-) you'll need at least an ebony case handcrafted!

22:29 <sunxi_fan> nice web site. don't get me wrong, BTW. i was joking.. i'm for first really convinced the Allwinner gears deliver an impressive performance in respect to the low cost they are selling off.. i'm just wondering how the "end user" can understand the value inside..

22:32 <kdubious> the value is the software

22:32 <kdubious> an I2S signal straight from the CPU, versus a dirty PC motherboard

22:35 <sunxi_fan> the SOC approach is surely better then a "heavy PC", indeed..

22:37 <sunxi_fan> which A20 board are you using for test? cubietruck?

22:40 <kdubious> ITEAD

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23:32 <kdubious> sunxi_fan, are you still there?

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