Is there a Windows driver for the nRF52840 USB CDC ACM?

[Roger Clark]

Hi

I'm trying to use the nRF52840 USB Serial UART device (aka USB CDC ACM) however I can't find a Windows driver for this device

The VID is 0x1915 and the PID is 0x520F

I've looked in all the development files listed for the nRF52840 PDK www.nordicsemi.com/.../nRF52840-Preview-DK

But I can't find a driver.

I've tried forcing a CDC ACM driver using libwdi, but although the board then appears as a serial device, I can't see any data from the board, so I presume that method is not valid as it may be a composite device and i need a more complex install method (or the official driver)

[Eugene]

Hi. You can find "nordic_cdc_acm_example.inf" file in the project folder. Try to use it through "Device manager"

[Roger Clark]

Thanks.

I found and tried using that file but I just get

"Windows was unable to install your nRF52 USB CDC Demo"

[endnode]

Hi Roger,

This works for me on Win7:

• Installing the latest SEGGER J-Link SW package from here.
• Installing the latest mBed Windows USB serial configuration driver from here.
• Plug the board to USB port and hope Windows will recognize and install driver automatically (it is USB composite device, it must roll out multiple drivers/devices).
• If not then go into manual driver selection, find and select mBed driver.
• Afterwards Windows magically recognize USB composite device and install set of SEGGER drivers/devices.

This worked for me on several nRF5x DK boards in the past (it's also good to keep SEGGER J-Link OB FW/MCU updated through J-Link Commander).

Cheers Jan

[Roger Clark]

Hi Jan

I don't mean the segger USB Serial. I mean the application USB connection of the nRF52840.

The HID works OK (as Windows does not need a driver for this), but Windows 7 needs a driver for USB CDC ACM (USB Serial). Actually WIndows 7 has a built in driver for USB CDC ACM if the hardware implements the default protocol (not a special protocol like the FT232 etc use), however Windows 7 will not use its own driver unless you either have a signed driver installer or use something like libwdi)

Anyway, I will try another W7 machine in case I confused my dev machine by trying to use libwdi

[Hung Bui]

Hi Roger,

I found that issue on my PC too.

I checked with the developer, it could be an issue with signing for the driver. We will look into that.

The work around is to select: "Browse my computer for driver software" -> "Let me pick from a list " -> "Ports (COM & LPT)" ->"Have Disk..."

After that you select the nordic_cdc_acm_example.inf file in the SDK folder. It should work after that.