AXEL Lite SOM/AXEL Lite Evaluation Kit/Interfaces and Connectors/Audio
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Contents
AudioEdit
DescriptionEdit
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.
SignalsEdit
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 mappingEdit
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 usageEdit
For example, it is possible to play a file using aplay -D hw:0,0 device access.