This version (20 Apr 2023 11:33) was approved by Arturs Artamonovs.
Table of Contents
USB Gadget Audio
This page provides how to use the USB Gadget Audio on ADSP-SC5XX board which makes the the Board as an audio card.
The USB Gadget Audio feature can be enabled when following the Quickstarguides within Linux for ADSP-SC5xx Processors 3.0.0 (develop). You have to append the following line in the
conf/local.conf file: DISTRO_FEATURES:append = “ adi_usb_gadget_audio”
Hardware Configuration
Connect the USB micro-B plug cable into the USB HS/OTG Device port, as showing below:
Example Usage
Class 2.0
EZ-KIT target board
root@adsp-sc589-mini:~# ls /dev/snd/ by-path controlC0 controlC1 pcmC0D0c pcmC0D0p pcmC1D0c pcmC1D0p timer root@adsp-sc589-mini:~# modprobe g_audio c_srate=48000 g_audio gadget: Linux USB Audio Gadget, version: Feb 2, 2012 g_audio gadget: g_audio ready
A new sound card UAC2Gadget is generated both for playback and capture on the EZ-KIT board:
rroot@adsp-sc589-mini:~# arecord -l **** List of CAPTURE Hardware Devices **** card 0: sc5xxasoccard [sc5xx-asoc-card], device 0: adau1761 adau-hifi-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: UAC2Gadget [UAC2_Gadget], device 0: UAC2 PCM [UAC2 PCM] Subdevices: 1/1 Subdevice #0: subdevice #0 root@adsp-sc589-mini:~# aplay -l **** List of PLAYBACK Hardware Devices **** card 0: sc5xxasoccard [sc5xx-asoc-card], device 0: adau1761 adau-hifi-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: UAC2Gadget [UAC2_Gadget], device 0: UAC2 PCM [UAC2 PCM] Subdevices: 1/1 Subdevice #0: subdevice #0
Record audio data from the new generated UAC2 sound card (arecord card 1, device 0) and play the record data via normal playback device (aplay card 0, device 1)
root@adsp-sc589-mini:~# arecord -f dat -t wav -D hw:1,0 -c 2 -r 48000 -f S16_LE |aplay -D hw:0,0 Recording WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Play audio over USB on Host
On the Linux-Host PC
With following command you should be able to see the USB Gadget Audio device is there on your HOST:
test@madara:~$ lsusb
Bus 002 Device 033: ID 1d6b:0101 Linux Foundation Audio Gadget
Then we list the available sound card on host PC, to decide which sound card is associated with mini board
test@madara:~$ cat /proc/asound/cards 0 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xf7d00000 irq 28 1 [Gadget ]: USB-Audio - Linux USB Audio Gadget Linux 4.19.0-yocto-standard with musb-hdrc Linux USB Audio Gadget at usb-0000:0
test@madara:~$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CX20641 Analog [CX20641 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Gadget [Linux USB Audio Gadget], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 test@madara:~$ arecord -l **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CX20641 Analog [CX20641 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 2: CX20641 Alt Analog [CX20641 Alt Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Gadget [Linux USB Audio Gadget], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0
USB Audio Gadget is the sound card 1 (aplay card 1, device 0) and Play audio file
test@madara:~$ aplay -D hw:1,0 sample_s16_le.wav Playing WAVE 'sample_s16_le.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Now, from the headset we can hear music is playing out.
Go TO USB Interface
resources/tools-software/linuxdsp/docs/linux-kernel-and-drivers/usb/device_mode/gadget_audio_3_0_0.txt · Last modified: 20 Apr 2023 11:20 by Vasileios Bimpikas