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)

[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.

[Roger Clark]

Thanks

That method did install the driver (after I accepted the warning about it being unsigned)

Ideally you'd need a much simpler way for people to install Windows drivers ;-)

However the demo, doesn't seem to output any text to the com port.

I compliled and uploaded using Keil and the application is definitely working, as I can log to the JLink USB Serial (when I have the cable connected to the JLink USB), and I added code to log when the BSP button is pressed and it would be writing text to the USB serial, and that worked fine.

(I guess I can connect to both USB's at the same time but wasnt sure, so at the moment I only connect one at a time)

Anyway, in the terminal I'm using "Hercules" I don't get any text. All that seems to happen is the CTS indication comes on when I press the button.

Can you tell me what terminal emulator you used ?