odroid-c4:application_note:external_connector:lineout [ODROID Wiki]

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====== Lineout Audio (J4) ======

<WRAP round important>
This functionality is available on Ubuntu.
  * Linux kernel version should be 4.9.230-35 (Aug 27, 2020) or higher.
  * The Linux kernel must support Device Tree overlays. That has been supported since linux 4.9.230-35.
</WRAP>

==== Hardware connection ====
{{:odroid-c4:application_note:external_connector:odroid-c4wj4pic.jpg?600|}}

=== Connection Diagram ===
{{:odroid-c4:application_note:external_connector:odroid-c4wj4.jpg?600|}}
==== Enable line-out device tree overlay ====
When the hardware is ready, you need to enable the device tree by editing the config.ini file.\\
Check the link below for the description of Device Tree Overlay in ODROID-C4.\\
[[common:application_note:software:device_tree_overlay|Device Tree Overlay]]

== Edit config.ini file ==
This is the DTBO part of the config.ini file of Odroid-C4.
<code ini>
; Device Tree Overlay
overlay_resize=16384
overlay_profile=
overlays="spi0 i2c0 i2c1 uart0"

[overlay_custom]
overlays="i2c0 i2c1"

[overlay_hktft32]
overlays="hktft32"

[overlay_hktft35]
overlays="hktft35"
</code>

Add a lineout profile and put the profile name (lineout) in the overlay_profile variable.
<code ini>
; Device Tree Overlay
overlay_resize=16384
overlay_profile=lineout
overlays="spi0 i2c0 i2c1 uart0"

[overlay_custom]
overlays="i2c0 i2c1"

[overlay_hktft32]
overlays="hktft32"

[overlay_hktft35]
overlays="hktft35"

[overlay_lineout]
overlays="lineout"
</code>

Save the config.ini file and reboot.
<code bash target>
root@odroid:~# reboot
</code>

You can see that the sound card is enabled.
<code bash target>
root@odroid:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: SPDIF-dit-hifi dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ODROIDLINEOUT [ODROID-LINEOUT], device 0: TDM-C-T9015-audio-hifi T9015-audio-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
root@odroid:~#
</code>