Revision as of 12:16, 24 November 2011

IGEP0022 article

Audio setup

The TPS65950 provides 2 gain stages which can be used to change the audio out signal amplitude. A digital gain which can be regulated by two alsa mixer settings and a analog one. Following code snippets may help you to use it.

amixer set -D hw:0 'DAC2 Analog' 50%

amixer set -D hw:0 'DAC2 Digital Fine' 50%
amixer set -D hw:0 'DAC2 Digital Coarse' 50%

Headset Output

Hardware access via

3.5mm standard stereo audio jack mounted on the top of the board

In order to activate headset output, following commands have to be executed on shell.

amixer set -D hw:0 'Headset' 0dB
amixer set -D hw:0 'HeadsetL Mixer AudioL2' on
amixer set -D hw:0 'HeadsetR Mixer AudioR2' on

Earphone Output

Hardware access via

TP606 = EAR.P
TP605 = EAR.M
which are on the backside of the board

In order to activate earphone output, following commands have to be executed on shell.

amixer set -D hw:0 'Earpiece' 6dB
amixer set -D hw:0 'Earpiece Mixer AudioL2' on
amixer set -D hw:0 'Earpiece Mixer AudioR2' on