GPIO pins used on the audio injector sound card

[flatmax]

For reference, this message notes which GPIO pins are used by the Audio Injector (AISC).
The AISC shares the I2C pins for setup and management of the sound card's codec's registers. These are :
pin 3 : i2c data
pin 5: i2c clk

The AISC uses the I2S pins for communicating audio data to and from the Raspberry Pi. Thses pins can not be shared amoungst add ons and hats when the AISC is in use. The I2S lines are the following pins :
pin 12 : Bit clock
pin 35: LR clock
pin 38: Data in
pint 40: Data out

For power, the required pins are :
pin 2 & 4 : 5V
pin 17 : 3.3V
gnd pins : as many as you want to hook up !

These are shown in the following image.

I2S and I2C pins

i2spins-001.jpg (137.65 KiB) Viewed 36976 times

[karrika]

Thank you for the pinout. You might want to add your card to http://pinout.xyz/. I was scared that some pins would conflict with my light control board DiscoHAT but fortunately we have no conflicting pins!

My card is still with DHL. By the way, DHL changed their policies in May and currently they charge a 40€ delivery fee if you do take care of customs paperwork by yourself. This used to cost nothing before May. If you allow DHL to make the customs declaration they charge some service fee. So you end paying about €40 extra whatever you do.

[flatmax]

Happy to hear about the pin out situation.
Sorry to hear about the DHL issue. If it is free to return to us without accepting, then we will be able to ship to you from Amazon in about 1.5 weeks or possibly 2.

Matt

[karrika]

Thank you. I paid DHL already. It is not your problem that DHL gets greedy. I just have to avoid DHL for small items in the future. The handling fee is ok if the price of the goods is much larger than the DHL fee. But sending a 23€ iten with DHL makes no sense anymore.

[flatmax]

The handling fee is ok if the price of the goods is much larger than the DHL fee. But sending a 23€ iten with DHL makes no sense anymore.

Agreed, in future we will not be using a courier ... we will use something like EMS to keep prices down.

[fontalamh]

Does the use of pins 3 & 5 mean this is incompatible with the official touchscreen?
It uses 3,4,5 & 6 - but I don't know if that's means they are mutually exclusive.
I answered my own question - it's only power that comes through the pins so I can power the screen by USB.

[flatmax]

The I2C pins (3 & 5) form an I2C bus which is shared amongst many different chips. I2C allows interchip communications and chips know when they are being "talked to" by inspecting the chip ID used (part of the first byte of data to go out on the i2c bus) and seeing if it matches their own chip ID.
It is possible that your LCD is using this bus for power. It is also possible that it is using the i2c lines for communications.

Matt

[caco_viejagorda]

Hi. Is there any way to make it work on a raspberry pi 1 model b? assuming that it will be connected via individual cables, and not as a hat.
Thanks!

[flatmax]

It is possible it can be made to work on that model Pi. You would need the I2S pins to match and the I2C pins as well.

Let us know if you make any progress !
thanks
Matt

[vanmanda]

Hi,
We are having a strange problem when using the AudioInjector board combined with a buttonprint connected to some GPIO-ports.
When we remove the AudioInjector from the Raspberry PI and use buttons connected to GPIO IO 5 - 6 - 12 - 13 - 16 - 26, we can read the status of these IO-ports.
When we however place the AudioInjector on top of the Raspberry Pi GPIO 5 - 6 and 12 keep working fine. We are however nog longer able to read changed port statusses from port GPIO 13 - 16 and 26.
Can you please advice?

Thank you !