how to tell if USB DAC is async or adaptive?

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CharlieLaub

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Joined 2007
audio.claub.net
#1
I just bought a 24/96 USB DAC on Ebay. This uses the SA9023 for USB interface. Not 100% sure but I think that this chip can be configured to work in either adaptive or asynchronous USB data transfer mode. I'd like to check which mode this particular unit uses. How can I do that? I have access to Windows 8.x and Linux (Raspbian and Ubuntu 15.04) systems.
 
#2
Output of lsusb -v or file /proc/asound/cardX/stream0 . Here is output of
HiFimeDIY Audio SA9023 (copied from problem with volume level after reboot : Bug report • RuneAudio Forum ):

Code: 
interface #0 stream status: (/proc/asound/card0/stream0)
--------------------------------------------------------
HiFimeDIY Audio SA9023 USB Audio at usb-bcm2708_usb-1.2, full speed : USB Audio

Playback:
  Status: Running
    Interface = 3
    Altset = 1
    Packet Size = 388
    Momentary freq = 44100 Hz (0x2c.199a)
  Interface 3
    Altset 1
    Format: S16_LE
    Channels: 2
    Endpoint: 3 OUT (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000
  Interface 3
    Altset 2
    Format: S24_3LE
    Channels: 2
    Endpoint: 3 OUT (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000

Capture:
  Status: Stop
  Interface 2
    Altset 1
    Format: S16_LE
    Channels: 2
    Endpoint: 2 IN (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000
  Interface 2
    Altset 2
    Format: S24_3LE
    Channels: 2
    Endpoint: 2 IN (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000
 
#3
Awesome! Thanks for sharing that. Here are the contents of the "stream0" file for the DAC (while I am giving it a listen):
Code: 
SA9023 USB Audio at usb-3f980000.usb-1.2, full speed : USB Audio

Playback:
  Status: Running
    Interface = 3
    Altset = 1
    Packet Size = 224
    Momentary freq = 44100 Hz (0x2c.199a)
  Interface 3
    Altset 1
    Format: S16_LE
    Channels: 2
    Endpoint: 3 OUT (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000
  Interface 3
    Altset 2
    Format: S24_3LE
    Channels: 2
    Endpoint: 3 OUT (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000

Capture:
  Status: Stop
  Interface 2
    Altset 1
    Format: S16_LE
    Channels: 2
    Endpoint: 2 IN (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000
  Interface 2
    Altset 2
    Format: S24_3LE
    Channels: 2
    Endpoint: 2 IN (ADAPTIVE)
    Rates: 96000, 88200, 48000, 44100, 32000
 
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