USBD Audio only supports 2 Channels and 48000 Frequency and FAIL on other values

[engleok]

Hi,

I am working on the nrf52840 DK using "nRF5_SDK_16.0.0".

I tested out the example code for USBD Audio in "examples\peripheral\usbd_audio".

If I use the default values (as is), this works fine in Windows 10 using Audacity 2.3.2 to record and VLC to playback an audio file.

However, if I change "main.c" at either the No. of Channels to 1 at line 147 or Frequency to 16000 at line 151, Audacity reports the following error:  

"Error opening recording device. Error code: -9999 Unanticipated host error."

Please confirm if this is a limitation of nrf52 or refer me to an example that works otherwise.

thanks

engleok

[Hung Bui]

Hi Engleok, 

We found that it was because Windows cached the descriptor of the device. So if you go to Device Manager and click Uninstall device. Then unplug and plug the device USB port again, Windows will reinstall the device and will update the descriptor. Another option is to change to another PID so that it will show up as a new device to Google. 

[engleok]

Hung Bui,

Confirmed. Thanks for the solution.

engleok