akiyukiokayasu / raspberrypi_i2s_slave

General I2S slave I/O device tree overlay for Raspberry Pi.

RaspberryPi_I2S_Slave

General I2S slave I/O device tree overlay for Raspberry pi.
Tested with Raspberry pi Compute Module 3+ and Asahi Kasei AK4556.

• I2S slave: Raspberry pi
• I2S master: Audio codec(ex. AK4556)

I2S Master version

How to use

Compile on Raspberry Pi

dtc -@ -H epapr -O dtb -o genericstereoaudiocodec.dtbo -Wno-unit_address_vs_reg genericstereoaudiocodec.dts

Copy i2smaster.dtbo to /boot/overlays

sudo cp genericstereoaudiocodec.dtbo /boot/overlays

Edit /boot/config.txt
Enable I2S and add i2smaster device tree overlay

#dtparam=i2c_arm=on
dtparam=i2s=on
#dtparam=spi=on
dtoverlay=genericstereoaudiocodec

If you don't need HDMI audio output and Raspberry Pi's headphone output, comment out "dtparam=audio=on" by hash.
like this.

#dtparam=audio=on

raspberrypi_i2s_slave's Issues

Support sampling rate

Hi, i found that only work at PCM44.1K to PCM192K, would you plesae tell me how to change this feature? Higher sample rate and DSD suported is what i need, thanks

i2c for Fs management

Hello, Akiyuki.

Thank you for great driver. Is it possible to add i2c management in order to switch external clocking (BCK, LRCK), in similar way as HATs doing, like Hifiberry etc?

Thanks