USB Audio on RPi 5

srini

Hello,

I am running version v15.1.0 on Raspberry Pi 5 with official TouchDisplay 2.

I am unable get USB audio working. I have AudioEngine2+ speakers with DAC built-in (Texas Instruments PCM2704 16-bit stereo audio DAC). I can see it under hardware page of devices in Emteria console. But no way to get it working.

Could you please give me some guidance on how to do it, I can only see 3 options in RPi settings:

3.5 mm jack (RPi 3/4) and Digital Audio
HDMI0
HDMI1

I have set it to first option with 16-bit audio quality.

srini

Just to update, I have tested the audio using the official bookworm OS from Pi, it just works out of the box. But can we please make it work on android as well ?

srini

further update.
logcat show the following

logcat -b all | grep -i audioengine
01-19 12:22:19.127     0     0 I usb 1-1 : Product: Audioengine 2+
01-19 12:22:19.127     0     0 I usb 1-1 : Manufacturer: Audioengine
01-19 12:22:19.252     0     0 I input   : Audioengine                      Audioengine 2+   as /devices/platform/axi/1000120000.pcie/1f00200000.usb/xhci-hcd.0/usb1/1-1/1-1:1.2/0003:08BB:2704.0001/input/input5
01-19 12:22:19.252     0     0 I hid-generic 0003: 08BB:2704.0001: input,hidraw0: USB HID v1.00 Device [Audioengine                      Audioengine 2+  ] on usb-xhci-hcd.0-1/input2
01-19 12:23:00.578   734   911 D EventHub: No input device configuration file found for device 'Audioengine                      Audioengine 2+  '.
01-19 12:23:00.585   734   911 I EventHub: New device: id=3, fd=224, path='/dev/input/event4', name='Audioengine                      Audioengine 2+  ', classes=KEYBOARD | LIGHT | EXTERNAL, configuration='', keyLayout='/system/usr/keylayout/Generic.kl', keyCharacterMap='/system/usr/keychars/Generic.kcm', builtinKeyboard=false,
01-19 12:23:00.677   734   911 I InputReader: Device added: id=4, eventHubId=3, name='Audioengine                      Audioengine 2+  ', descriptor='0638acc685d4d5aa454de1587363aaed8dddac2b',sources=KEYBOARD
01-19 12:23:06.673   734  1036 D UsbHostManager: USB device attached: vidpid 08bb:2704 mfg/product/ver/serial Audioengine                     /Audioengine 2+  /1.00/null hasAudio/HID/Storage: true/true/false
01-19 12:23:06.697   734  1036 D UsbHostManager: Added device UsbDevice[mName=/dev/bus/usb/001/002,mVendorId=2235,mProductId=9988,mClass=0,mSubclass=0,mProtocol=0,mManufacturerName=Audioengine                     ,mProductName=Audioengine 2+  ,mVersion=1.00,mSerialNumberReader=com.android.server.usb.UsbSerialReader@40f3796, mHasAudioPlayback=true, mHasAudioCapture=false, mHasMidi=false, mHasVideoCapture=false, mHasVideoPlayback=false, mConfigurations=[
01-19 12:23:09.201   734  1036 I UsbAlsaManager: Ignore caching device as the type is NONE, device=UsbAlsaDevice: [card: 2, device: 0, name: USB-Audio - Audioengine 2+, hasOutput: true, hasInput: false]

smieschek

@srini we don't suppport USB audio so far. Can you check which kernel modules are loaded in bookworm for the Audioengine?
you can afterwards compare if they are included in our kernel: https://github.com/emteria/kernel_brcm_rpi/blob/v6.6.36/arch/arm64/configs/android_rpi5_defconfig

srini

Thanks, not sure if the peripheral needs to be connected during initial boot (after flashing sd card), which I didn't do.
I did the same this time with Android 14, it just worked.

skuld

I think it might be due to emteria's port of alsa:
/vendor/lib64/libasound.so
It appears to not be 16KB aligned.
I've been trying to directly interact with it to get sound and it fails to load the library no matter what I try.

But I've not gotten any sound at all working, not just USB.