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What are the left GPIOS when using Wolfson Audio Card ?

Former Member over 10 years ago

I would like to use some gpios for my stuff beside using the wolson audio card, but I can not find which are the GPIO that are still available.

Can some one help me about this ?

Best Regards

0 fvan over 10 years ago

I believe only GPIO 14&15 (UART Rx/Tx) are available on header pins on the Wolfson card. You could also try to use the I2C pins.

Frederick
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0 Former Member over 10 years ago in reply to fvan

Ok, so it means that Wolfson Audio card does not use I2C ?
My goal is to add push buttons, leds or rotary encoder without adding an mbed or arduino board to the raspberrypi.

For those that could be intersted, I want to realise an portable Spdif audio recorder that will works with an DMI2 from neumann (https://www.neumann.com/?lang=fr&id=current_microphones&cid=kmd_dmi-2portable) which is an interface for digital microphones.

So from, I could be able to record digital signal from this interface with the raspberry and wolfson audio card. All of the settings (source, sample rate, name of the file) is driven from a web server that run on the raspberry. So it's easy with an smart phone, laptop or anaything that works with wifi and ethernet to drive it.

At the end, I alrready developped an plugin which works under Reaper (www.reaper.fm) to transform the raspberry py to an audio interface. To realize it, I just use ethernet that sends/reads udp packet between the rapsberry and the reaper daw.

best regards.
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0 Former Member over 10 years ago

You can use I2C (I believe the Wolfson card uses I2C as well), however there is no breakout for the I2C pins, so you will have to - at a minimum - solder a few pins to use it. I've successfully driven a RTC and OLED display from the bus, and plan to add a GPIO expander. I went a bit overboard and replaced the header with a stacking header, but I imagine you could solder a few pins to the existing ones.
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0 Former Member over 10 years ago in reply to Former Member

Yes, you can do that. See here: Re: Access to 5 GPIO pins with Wolfson Sound Card
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