Lineout Audio (J4)
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.
Hardware connection
Connection Diagram
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.
Device Tree Overlay
Edit config.ini file
This is the DTBO part of the config.ini file of Odroid-C4.
; 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"
Add a lineout profile and put the profile name (lineout) in the overlay_profile variable.
; 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"
Save the config.ini file and reboot.
- target
root@odroid:~# reboot
You can see that the sound card is enabled.
- 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:~#
ck.kim