Audio Amplifier

The iLCD Linux series is fitted with an audio chip, which is capable of outputting amplified audio signals directly into a speaker. This section offers information regarding the use of this hardware.

Category	Info
Producer	Texas Instruments
Name	TAS2563
Power	6.1 W
Speaker Impedance Range	3.6 - 8 Ohm

The aplay -l command lists all connected devices. The TAS2563 will be listed as tas2563 [DPP-LXX-8p Soundcard tas2563]

Device Configuration

The TAS2563 offers sound profiles to conveniently store and switch between various presets.

Profile id 0 and 1: speaker gain -15 dB
Profile id 2:       speaker gain   0 dB

The sound profiles can be set in the following way to give just an example:

tinymix set "TASDEVICE Profile id" <id Number>

Alternatively one could use alsamixer, which is a rudimentary GUI tool which comes preinstalled on the demo, debug and core builds of the iLCD Linux Images.

Additionally, the volume can be adjusted by setting tas2563-amp-gain-volume (range: 0-28) and tas2563-digital-volume (range: 0-32768)

Here is a usage example:

tinymix set "tas2563-amp-gain-volume" 15
tinymix set "tas2563-digital-volume" 8192

Program and Configuration have to be set to 0.

tinymix set "Program" 0
tinymix set "Configuration" 0

Test playback

aplay /unit_tests/ASRC/audio8k16S.wav