====== SPDIF ======

===== Introduction =====

This page introduces the usage of SPDIF bus on [[products:sbc:common:applications:gpio:40pin-header|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 =====

<tabbox VIM3/3L>

In order to use the SPDIF, you need to enable the SPDIF function via [[products:sbc:common:configurations:device-tree-overlay|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.

```shell
fdt_overlays=spdifout

```

After reboot, you can connect your spdif device to corresponding pins.

<tabbox VIM4>

In order to use the SPDIF, you need to enable the SPDIF function via [[products:sbc:common:configurations:device-tree-overlay|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.

```shell
fdt_overlays=spdifout

```

After reboot, you can connect your spdif device to corresponding pins.

<tabbox VIM1S>

In order to use the SPDIF, you need to enable the SPDIF function via [[products:sbc:common:configurations:device-tree-overlay|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.

```shell
fdt_overlays=spdifout

```

After reboot, you can connect your spdif device to corresponding pins.

</tabbox>

===== SPDIF Usage =====

After connecting your device.

``` shell
$ aplay -l                # find your spdif card and play audio using it
$ aplay -D hw:0,1 <audio_file>.wav # replace 0,0 with spdif interface (card,device)
```