A lot of Playback items!

Many of us have asked for such a list. But as yet there has been no answer either from Wolfson or Element 14. As with most things to do with this card.

It's a great shame as the hardware seems really good. But the level of support and the software are awful.

Hi,

yes, that's true. The hardware is really good. Hi end for low price. Maybe that's the reason?

This is the really short version...

The card has three analog inputs:

IN1R                  - Headset microphone. This is the right channel of analog input IN1. IN1L exists on the chip but isn't connected to anything.

IN2L and IN2R    - The onboard DMIC microphones, left and right. Note that the markings on the board are wrong.

IN3L and IN3R    - Line In, left and right.

There are two analog outputs:

HPOUT1L and HPOUT1R     - Headset, left and right.

HPOUT2L and HPOUT2R     - Line Out, left and right.

The card has three digital Audio InterFaces (AIF), each of which have a  receiver (RX) and a transmitter (TX).

RX is signals coming in to the card from the Pi, the S/PDIF chip or the expansion connector. TX is signals going out from the card.

AIF1     - Interfaces with the Raspberry.

AIF2     - Interfaces with the S/PDIF chip.

AIF3     - For future goodies. On the expansion connector.

Speaker connections:

SPKOUTL and SPKOUTR    - Onboard analog speaker circuit and amplifier.

SPKDATL and SPKDATR    - Interface for Digital Speakers connected to the expansion connector.

Then there is a gazillion of other stuff on the card, equalizers, filters, DSPs and whatnot.

I'm working on writeup that will describe the card in more detail, but work and spending time with the family tends to get in the way.

At least I have managed to make an illustration...

Anyhow, I hope this clears some of the fog

--

Ragnar

Ragnar,

You seem to be single handedly supporting the Woolfson card. We, the community, appreciate it very much. But it is a sad state of affairs when we get no support from Woolfson or Element14.

Leo

Ragnar,

I agree with Leo, I look for all your posts, since you seem to be the one with the answers. Thanks so much.

Ian

Thanks! That clears the fog about all inputs!

Now some detail got my attention: P1 pin 10 and P1 pin 8. Are those pins of RPi GPIO available for use? Or are they just for specific control? Are BCM chip or Board numbers?

By the way, I use a Guitar Effects Processor software and JACK with default settings and worked well. I'm surprised because JACK also selected "Line in" as default and didn't get confused with all those inputs.

They are connected to physical pins 8 and 10 on the Raspberry's 26-pin P1 header.

GPIO14 and GPIO15 in the picture.

They are normally used as the UART serial console, but that function is easy to disable.

Raspberry Pi • View topic - Easily disable / enable serial console

Raspberry Pi and the Serial Port

With the serial console disabled, the two pins can be used as ordinary GPIO pins.

--

Ragnar

I guess I still able to use a serial lcd display, right? If I can, which options are available in the market?

Apparently, AIF3RX1, AIF3RX2 ,AIFTX1, AIFTX2 are alternate interfaces for other boards. Interesting, because this card could be used with another computer board...

Or perhaps is for adding another S/PDIF interface?

I would like to have more info about that

Late response, but better than none :-)  Thank you for your work.

Here is my newest-> rt-kernel 3.12.33 with support for Wolfson card and (NOT TESTED!) newer Cirrus Logic as deb-package download.

https://blog.georgmill.de/2015/02/18/update-for-wolfson-audio-card-on-raspberry-pi/