On 15/03/2019 21:06, Chris Caudle wrote:
On Fri, March 15, 2019 11:19 am, olaf@xxxxxxxxxx wrote:
I got my hands on the sound devices usb pre 2.
...
Because it should be also standard compliant for usb2 which would make
it possible to work in 96k I wonder what would have to be done to make
this possible.
I think you will have to ask Sound Devices. This tech note seems to
indicate that the device supports both class 1 and class 2, but it does
not indicate you have to do anything to switch:
https://www.sounddevices.com/tech-notes/high-sampling-rates-with-usbpre-2
If you look at the output of lsusb do you see multiple endpoints? Perhaps
it exposes a class 1 and a class 2 endpoint simultaneously.
lsusb doesn't return much
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 04e8:7301 Samsung Electronics Co., Ltd
Bus 001 Device 004: ID 2232:1083 Silicon Motion
Bus 001 Device 003: ID 8087:0a2b Intel Corp.
Bus 001 Device 006: ID 0926:0202
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
so i tried lsusb -t
lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
|__ Port 1: Dev 6, If 3, Class=Human Interface Device,
Driver=usbhid, 480M
|__ Port 1: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 1: Dev 6, If 2, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 1: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 6: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 6: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
|__ Port 7: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 7: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
|__ Port 8: Dev 5, If 0, Class=Vendor Specific Class, Driver=, 12M
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