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I´m working on a project with a Raspberry 4 compute module and IO board. This is a schema of the project: https://drive.google.com/file/d/1mg5IhAKTUE2Athzafis1KSsEJS1T7DXG/view?usp=sharing

I have to handle audio and voice to make calls with the raspberry. My setup consists of an audio box, which has a headset connected to it, pass the signal through a TLV320AIC3104 audio codec connected via PCM to the raspberry, and then make calls through a USB modem, which has an integrated audio card. I need two way communication.

So far, I can make the calls with the raspberry and have audio and voice with the caller, using a USB headset.

I am using the TLV320AIC3104EVM-K evaluation board (https://www.ti.com/lit/ug/slau218a/slau218a.pdf?ts=1664262721095&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTLV320AIC3104EVM-K) to learn how to connect the audio codec to the raspberry, but so far I have been unable to get anything. When the TLV320AIC3104EVM-K is connected to the PC via USB I can use the headset passing through the audio box without problems.

The thing is I can´t figure out how to connect the audio codec to the raspberry to get the headset audio, and then finish the setup passing the information to the modem and back.

I understand that the connection between the TLV320AIC3104EVM-K and the Raspberry is actually an I2S connection. I have connected the GPIO PCM ports (GPIO 18, 19, 20, 21). I have configured the raspberry in the file /etc/asound.conf to have the card0 as default, being this card the one from the modem.

/etc/asound.conf

pcm.!default {
        type hw
       card 0
}

ctl.!default {
        type hw
        card 0
}

And have the GPIO ports configured to ALT0. What am I missing here?

Ankilarion
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0 Answers0