2 USB devices (eg. 2 USB CDC ACM or 1 USB ADC ACM and 1 USB Audio) simultaneously

[engleok]

I am working on the nRF52840 DK and nRF52 SDK 15.2.

I can run the USB CDC ACM example and the USB Audio example successfully.

Is there a way to create BOTH devices at the same time? Much like a USB composite device.

I tried looking at the USB HID Composite device as a reference but it seems specific to USB HID(?).

Idea is to use 1 of the USB CDC ACM device for control (send commands and receive status). And the 2nd device (whether USB CDC ACM or USB Audio to continuously receive Audio data.

thanks

[Sigurd]

Hi,

engleok said:

Is there a way to create BOTH devices at the same time? Much like a USB composite device.

Yes, that should be possible. Make sure that they use different endpoints and interface numbers.

[vincent.golle]

Hi,

I managed to create a composite CDC/MSC device, have a look at my code:

github.com/.../usb_cdc.c

The important thing to remember is that if your device only needs activating one of the classes upon user request, the dummy classes have to be used to have ALL the classes declared in the right order.

[Sigurd]

Nice, thank you for sharing this.