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I2S
Introduction
This page introduces the usage of I2S bus on 40-Pin Header.
I2S Information
| PIN | GPIO Name | GPIO Number | |
|---|---|---|---|
| VIM3/3L | 29 (BCK) | PIN.A1 | 477 |
| 31 (DATA) | PIN.A3 | 479 | |
| 32 (LRCK) | PIN.A2 | 478 | |
| 28 (GND) | GND | ||
| 1 (VCC) | 5V | ||
| VIM4 | 29 (BCK) | PIN.T1 | 447 |
| 31 (DATA) | PIN.T3 | 449 | |
| 32 (LRCK) | PIN.T2 | 448 | |
| 28 (GND) | GND | ||
| 1 (VCC) | 5V | ||
| VIM1S | 29 (BCK) | PIN.Z1 | 499 |
| 31 (DATA) | PIN.Z2 | 500 | |
| 32 (LRCK) | PIN.Z0 | 498 | |
| 28 (GND) | GND | ||
| 1 (VCC) | 5V |
Enable I2S
In order to use the I2S, you need to enable the I2S function via Device Tree Overlay.
To enable I2S, you need to add i2s to node fdt_overlays if it doesn't exist.
VIM3/3L
For VIM3, edit /boot/dtb/amlogic/kvim3.dtb.overlay.env to add i2s node to fdt_overlays node if it doesn't exist.
For VIM3L, edit /boot/dtb/amlogic/kvim3l.dtb.overlay.env to add i2s node to fdt_overlays node if it doesn't exist.
e.g.
fdt_overlays=i2s
After reboot, you can connect your i2s device to corresponding pins.
VIM4
Edit /boot/dtb/amlogic/kvim4.dtb.overlay.env to add i2s node to fdt_overlays node if it doesn't exist.
e.g. To enable I2S, you need to add i2s to node fdt_overlays if it doesn't exist.
fdt_overlays=i2s
After reboot, you can connect your i2s device to corresponding pins.
VIM1S
Edit /boot/dtb/amlogic/kvim1s.dtb.overlay.env to add i2s node to fdt_overlays node if it doesn't exist.
e.g. To enable I2S, you need to add i2s to node fdt_overlays if it doesn't exist.
fdt_overlays=i2s
After reboot, you can connect your i2s device to corresponding pins.
I2S Usage
$ aplay -l # find your i2s card and play audio using it $ aplay -D hw:0,0 <audio_file>.wav # replace 0,0 with i2s interface (card,device)