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by koalo
Sun Jun 22, 2014 2:32 pm
Forum: General discussion
Topic: Can I use an HDMI touch monitor with Raspberry Pi?
Replies: 3
Views: 1632

Re: Can I use an HDMI touch monitor with Raspberry Pi?

You CAN transmit touch information via the HDMI cable, but this requires special hardware.
http://blog.koalo.de/2014/01/remote-7-i ... ry-pi.html
by koalo
Wed Jun 11, 2014 11:46 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

talking about netjack solution. Should be a good solution with easy setup, but I don't know how good the drivers play together with jack (tested it once and it didn't work, but that should not prevent you from trying it again). It is just more expensive than the single-rpi solution. I want to achie...
by koalo
Wed Jun 11, 2014 8:04 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

But do you think this is also a suitable solution soundquality wise? Or is this just way to complicated? Which one do you mean? Or would it just be much simpler and/or better sounding to go the easy spdif way somehow. With spdif you do not gain anything. It can only transmit stereo, too. Maybe by u...
by koalo
Tue Jun 10, 2014 1:36 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

Would be real happy if you can share this. The basic idea is to let the Raspberry Pi think you are supplying 32 bit stereo, but actually you transmit 16 bit 4-channel. You can just change the header of a 4-channel wave file to achieve that. Secondly, you have to do a small driver modification to te...
by koalo
Tue Jun 10, 2014 10:58 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

AFAIK I2S is for stereo (2-channels) only. In the first place that is correct, but there are hacks to handle this limitation. Some thoughts can be found here: https://github.com/Guzunty/Pi/issues/11 Secondly, I have used a single Wolfson Audio Card, a small driver modification and some software to ...
by koalo
Sat Jun 07, 2014 10:56 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

I am sorry, you are totally right. The branch without -asoc is the current one (including support for the proto board). I have deleted the other one with -asoc now. The connection looks right.
by koalo
Tue May 13, 2014 9:41 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

Depends on what you want to do. I want to do 96kHz or 192kHz stereo capture, which means 3 of the 4 cards you listed are not appropriate, and from what I gather the Wolfson only works on a specially cobbled together kernel that they produced and is not being kept upto date. I'm using a currently pr...
by koalo
Tue May 13, 2014 6:27 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

Is there a "HOWTO get started with i2S" anywhere ? Depends on what you want to do. You can buy existing hardware, e.g. http://www.tjaekel.com/T-DAC/ http://www.hifiberry.com/ http://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories/wolfson_pi http://iqaudio.com/ They will ...
by koalo
Mon Apr 28, 2014 6:21 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

@gnozzi, @jotun: Which audio codec do you want to use? Especially for audio input, it is not so easy to provide a generic driver since the audio codecs usually need some configuration via I2C, but it would not be difficult to provide a driver for a specific audio codec (at least when there is alread...
by koalo
Tue Apr 08, 2014 8:37 am
Forum: Graphics, sound and multimedia
Topic: Touch-capable screen modules?
Replies: 2
Views: 1050

Re: Touch-capable screen modules?

I have built a touch-capable 7" screen that works via HDMI. Have a look here:
http://blog.koalo.de/2014/01/remote-7-i ... ry-pi.html
by koalo
Sun Jan 19, 2014 8:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Opinions on these cheap i2s S/PDIF/ TOSLINK/ analogue DACs?
Replies: 8
Views: 14821

Re: Opinions on these cheap i2s S/PDIF/ TOSLINK/ analogue DA

A driver for the WM8804 was just merged into the Raspberry Pi kernel. It is build for this S/PDIF/TOSLINK board: http://www.hifiberry.com/hbdigi Any other WM8804 based board should work together with this driver, too, but this board has the additional advantage of being build for the Raspberry Pi (m...
by koalo
Sun Jan 19, 2014 8:33 pm
Forum: Graphics, sound and multimedia
Topic: ALSA Multi-channel output
Replies: 5
Views: 3812

Re: ALSA Multi-channel output

I have never used the HDMI interface for transmitting audio, but as far as I know the snd-bcm2835 module is only for the headphones jack on the board and has nothing to do with HDMI.
by koalo
Sun Jan 19, 2014 5:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

For piping to SPI it might be possible to do just mpg123 -all_my_options_here > /dev/spidev0.0 For more information about the spi interface of the Raspberry Pi, have a look e.g. here: http://elinux.org/RPi_SPI If your goal is to just have S/PDIF/TOSLINK output for your Raspberry Pi, have a look here...
by koalo
Tue Jan 14, 2014 9:32 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

Should be possible, but you have to write a i2c driver for controlling the IC. Thank you. After reading the thread I get that writing a I2C driver is not an easy task ? Is there any literature out there that could help me get started ? Unfortunately I can not provide you more information. Have a lo...
by koalo
Mon Jan 13, 2014 4:59 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

Should be possible, but you have to write a i2c driver for controlling the IC.
by koalo
Mon Jan 06, 2014 8:58 am
Forum: Arch
Topic: Alsa-dmix not working
Replies: 9
Views: 6440

Re: Alsa-dmix not working

Then you might want to test the I2S driver in the current 3.10 or 3.12 kernel. Sure, you would not hear anything without external hardware, but you can check if this is a problem of the other ALSA driver or if there is anything else broken.
by koalo
Fri Jan 03, 2014 2:43 pm
Forum: Arch
Topic: Alsa-dmix not working
Replies: 9
Views: 6440

Re: Alsa-dmix not working

Are you sure it hangs and not only the output is silence?
Does it come back after some time (when the audio data should be finished)?
by koalo
Thu Jan 02, 2014 3:05 pm
Forum: Graphics, sound and multimedia
Topic: Portable music/radio streamer using i2s and TFT touchscreen
Replies: 5
Views: 5747

Re: Portable music/radio streamer using i2s and TFT touchscr

Great, that seems pretty reasonable!
If you like, it would be great if you would rebase your changes against the 3.10 branch (or 3.12 if your like) of the official kernel and send a pull request.
by koalo
Thu Jan 02, 2014 10:45 am
Forum: Graphics, sound and multimedia
Topic: Need help to get TFT screen connected to Pi
Replies: 3
Views: 1461

Re: Need help to get TFT screen connected to Pi

It should be possible to use a TFP401A - I have actually used this IC to connect a AT070TN9 display to the Raspberry Pi.
Although, as Burngate already mentioned: That is not so easy, you should be at least able to build a PCB and solder a TQFP 100.
by koalo
Thu Jan 02, 2014 10:38 am
Forum: Graphics, sound and multimedia
Topic: Portable music/radio streamer using i2s and TFT touchscreen
Replies: 5
Views: 5747

Re: Portable music/radio streamer using i2s and TFT touchscr

Hi BBUK,
very nice project! Looks great!
What are your actual changes needed in addition to the drivers in the foundation's kernel?

Greetings,
Florian
by koalo
Mon Nov 25, 2013 7:08 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

I finally managed to implement 24 bit transfer even with S24_3LE files :-D I don't need the test file anymore and will upload the required patch soon, but before I would like to know if anyone has tested the 3.10 branch so far or if there are stupid bugs induced by the update so that I can fix them ...
by koalo
Fri Nov 22, 2013 7:28 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

vadim wrote:Yay! Will test it this weekend.

Why 4 bytes and not SNDRV_PCM_FMTBIT_S24_3LE?
Because packed transmission is apparently not supported by the DMA controller.
by koalo
Fri Nov 22, 2013 7:18 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

0xFF wrote:How to check bytes count per sample for file?
If mplayer says: AO: [alsa] 48000Hz 2ch s32le (4 bytes per sample), thats ok ?
That should be fine.
by koalo
Fri Nov 22, 2013 7:01 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

I have finally managed to update the driver to 3.10 and to integrate a lot of style enhancements. Furthermore, it is now possible to set up the bit clock ratio via machine driver. https://github.com/koalo/linux/tree/rpi-3.10.y What still does not work is 24 bit support - has anyone a 24 bit file tha...
by koalo
Sun Nov 17, 2013 8:13 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 984
Views: 532865

Re: I2S: Anyone got it running? (answer is yes!)

And what is the name of it?

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