How to adding the volume control in the usbd_audio project? pls help me.

[sunny_axus]

1， The SDK is nRF5_SDK_14.2.0_17b948a; 

2, running the usbd_audio project;  It don't control the volume by 52840; 

3, Can you help me how to adding the volume control in this project?

Thank you very much!

[Simonr]

Hi

Due to the summer vacation period we are currently understaffed, so delayed replies must be expected. I am sorry about any inconvenience this might cause. 

The example does not support Volume Control requests by default, so you'll have to implement this yourself. You can do this by adding a descriptor and handling Volume Control requests according to the USB Audio 1.0 specification (which is the version our SDK uses).

Best regards,

Simon

[sunny_axus]

Dear Simon,

     Can you tell me how to adding a  descriptor and handling Volume Control requests?

I don't know much about the USB Audio 1.0.

Thank you very much!

Best regards

[Simonr]

Hi

I'm sorry, but you'll have to implement this yourself. I would suggest looking at how the usbd_audio project implements/adds other descriptors and handles requests and use that as reference, as the Volume control shouldn't be any different than other USB events/requests. You can download the USB audio 1.0 specification from this page: https://www.usb.org/document-library/audiovideo-device-class-v10-spec-and-adopters-agreement 

Best regards,

Simon

[sunny_axus]

Dear Simon,

       Thanks you support!

      I will take time to learn it.

Best regards.

Yin