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service:linux:aappnote:wm8983

WM8983 Audio Codec, Trizeps VIII

For a description on how to play or record audio view: Using Audio in Linux
You might need to adjust asound.conf to use 48kHz sample clock.

AlsaMixer Controls

The below picture shows the currently available control-widgets exported by the wm8983 driver.
Note that some features of the chip have not been implemented yet and thus are not shown in the diagram.
The text written in blue are the widgets that you can control: i.e. by using 'alsamixer' or 'amixer' application.

Headphone

Typical Setting:

Control Setting
Left Output Mixer only LDAC set
Right Output Mixer only RDAC set
Headphone (Switch) set (un-mute)
Out4 off → output VMID

Additional Setting:

Control Setting
Playback (Volume) desired volume (digital)
Headphone (Volume) desired volume (analog)
Headphone Playback ZC volume is changed on crossing zero

Speaker

Typical Setting:

Control Setting
Left Output Mixer only LDAC set
Right Output Mixer only LDAC set
Speaker Inversion set
Speaker (Switch) set (un-mute)

This setting is used, if a single speaker is connected to the SPEAKER pins of the Trizeps module; e.g. pins are used as SPEAKER_P and SPEAKER_N.
It is possible to attach two speaker with reduced performance, e.g. using pins as SPEAKER_L and SPEAKER_R.

Additional Setting:

Control Setting
Playback (Volume) desired volume (digital)
Speaker (Volume) desired volume (analog)
Speaker Playback ZC volume is changed on crossing zero
Speaker Boost set if VDD_SPEAKER (SODIMM-pin 12) is supplied with 5V

Microphone

Typical Setting:

Control Setting
Left Input Mixer only MicP and MicN set
Capture (Volume) desired volume (digital)
Capture PGA (Volume) desired gain (analog)
Capture PGA Boost (Volume) desired gain (analog)

Line-In

Typical Setting:

Control Setting
Left Input Mixer only L2 set
Right Input Mixer only R2 set
Capture (Volume) desired volume (digital)
Capture PGA (Volume) desired gain (analog)
Capture PGA Boost (Volume) desired gain (analog)

Accessing Codec Registers

For debugging purpose codec registers can be written by using I2C commands.

$ i2cset -fy 2 0x1A <regdata> <data>
regdata[7:1] register to access.
regdata[0] MSB (data[8]) of data to be written
data[7:0] lower 8bits of data to be written to register
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service/linux/aappnote/wm8983.txt · Zuletzt geändert: 2020/09/22 17:08 von