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SPDIF
Introduction
This page introduces the usage of SPDIF bus on 40-Pin Header.
SPDIF Information
| PIN | GPIO Name | GPIO Number | |
|---|---|---|---|
| VIM3/3L | 13 | PIN.AO10 | 422 |
| VIM4 | 13 | SPDIFOUT | 420 |
| VIM1S | 13 | SPDIFOUT | 470 |
Enable SPDIF
VIM3/3L
In order to use the SPDIF, you need to enable the SPDIF function via Device Tree Overlay.
For VIM3, edit /boot/dtb/amlogic/kvim3.dtb.overlay.env to add spdifout node to fdt_overlays node if it doesn't exist.
For VIM3L, edit /boot/dtb/amlogic/kvim3l.dtb.overlay.env to add spdifout node to fdt_overlays node if it doesn't exist.
e.g. To enable SPDIF, you need to add spdifout to node fdt_overlays if it doesn't exist.
fdt_overlays=spdifout
After reboot, you can connect your spdif device to corresponding pins.
VIM4
In order to use the SPDIF, you need to enable the SPDIF function via Device Tree Overlay.
Edit /boot/dtb/amlogic/kvim4.dtb.overlay.env to add spdifout node to fdt_overlays node if it doesn't exist.
e.g. To enable SPDIF, you need to add spdifout to node fdt_overlays if it doesn't exist.
fdt_overlays=spdifout
After reboot, you can connect your spdif device to corresponding pins.
VIM1S
In order to use the SPDIF, you need to enable the SPDIF function via Device Tree Overlay.
Edit /boot/dtb/amlogic/kvim1s.dtb.overlay.env to add spdifout node to fdt_overlays node if it doesn't exist.
e.g. To enable SPDIF, you need to add spdifout to node fdt_overlays if it doesn't exist.
fdt_overlays=spdifout
After reboot, you can connect your spdif device to corresponding pins.
SPDIF Usage
After connecting your device.
$ aplay -l # find your i2s card and play audio using it $ aplay -D hw:0,0 <audio_file>.wav # replace 0,0 with spdif interface (card,device)