multiple nRF52840's USB CDC ACM instances

[OceanS]

Hi, a question may need your kind help. Just wonder if nRF52840's USB CDC ACM could support multiple instances? For example, would it support CLI as well as an another serial instance like for AT command? If could , how could I get these? Many thanks.

[ovrebekk]

Hi 

Good to hear you solved the SoftDevice issue. 

Regarding the USB serial display name I am starting to think you would have to modify the .inf file in order to set the display name of the CDC interfaces. 

On Windows 8 and earlier this is quite straight forward, but on Windows 10 you can not provide an .inf file unless it is tested by Microsoft through the HLK framework. 

Which Windows version are you using yourself?

Best regards
Torbjørn

[Rob Philip]

Torbjörn:

I grabbed your example main file but alas it did not compile out of the box with the default parameters in the "CLI" demo. I added in app_usbd_serial_num.c and bsp_cli.c and removed "while (app_usbd_event_queue_process())" because first the function wasn't being built and then when I turned on APP_USBD_CONFIG_EVENT_QUEUE_ENABLE I got a compile error indicating 

#error "Current CLI CDC implementation supports only USB with event queue disabled (see APP_USBD_CONFIG_EVENT_QUEUE_ENABLE)"

so I modded it not to do that call and do nrf_cli_process instead, for each instance. But alas things did not work properly.

Is there any chance you could zip up and attache  complete working project? I would like (although don't *need*) to have two virtual comports between my PC and dongle for some debugging I need to do.

[ovrebekk]

Hi Rob

You will find the full example attached:
238013_usbd_cdc_acm_dual_cdc.zip

Hopefully you will have more success with it. 

Best regards
Torbjørn

[Rob Philip]

Thank you, good sir. 

I will try it today.

[Rob Philip]

That worked quite well. But it confused Windows 7 a lot - W7 could only assign a driver to one of the CDC ports. W10 and Mac OS did fine, though. I wonder if W7 is confused because both are "CDC Test". Any idea how one would label one of them "CDC Data" and the other "CDC Commands"?