SBC Axel SBC/Interfaces and Connectors/Audio

From DAVE Developer's Wiki
Jump to: navigation, search
Issue Date Notes
2021/07/19 New documentation layout

Audio[edit | edit source]

Description[edit | edit source]

The Audio interface available on the Evaluation Kit at the connector J27.

J27 is a 7x2x2.54mm header. The audio codec is a TLV320AIC3100 device connected to the I²S interface.

Audio connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# Pin name Pin function Pin Notes
4, 5, 8, 9 AGNDM Analog Ground
1 AUX_RES Analog ground
2 AUXR Microphone in right
3 AUXL Microphone in left
6 SPKM Speaker out (negative)
7 SPKP Speaker out (positive)
10 HSOR Audio Headset right
11 HSOL Audio Headset left
12 MIC_BIAS Microphone bias
13 AUD_HP_VGND Analog ground

Device mapping[edit | edit source]

The Audio interface is mapped to card0 ALSA device in Linux. The ALSA peripheral #0: sbcx-audio-tlv320aic3100 can be accessed via alsa-utils with hardware address 0.

Device usage[edit | edit source]

For example, it is possible to play a file using aplay -D hw:0,0 device access.