Example CDC ACM in 15.3

[Jimmy@zone]

When building the sample code using the latest SDK I do not see the device in the device manager and after a while I get this error:

Any hints on what is wrong ? 

/Jimmy

[Bjørn Kvaale]

Are you by any chance using Windows 7? If that is the case, you will need to run step 4 here. I have tested with a 52840 DK on Windows 10 & did not receive any issues at all. Are you by any chance using a usb hub? Maybe it would help to connect directly to your PC instead?

I have also noticed once in a while that I receive issues seeing my dev kits in the device manager & connecting to them via J-Link. The only workaround to this issue I have found is to restart the computer.

[Jimmy@zone]

I am using Windows 10 and switching back to 15.2 instead makes it work directly with out any issue. Rebooting the pc didn't help.

[Jimmy@zone]

I tried a different New Windows 10 pc.

Downloaded the latest Segger studio and installed the Nordic addon.

Downloaded the SDK

Connect the Dev kit, it installed 13.2 serial port ok, it was installed.

Build the C:\nRF5_SDK_15.3.0_59ac345\nRF5_SDK_15.3.0_59ac345\examples\peripheral\usbd_cdc_acm\pca10056\blank\ses

Start it on the Dev kit

Efter a few secons the error appers and a broken device is show in device manager.

Unknown USB Device(Device Descriptor Request Failed) 

[Bjørn Kvaale]

Sorry for the delayed response. I have tried this example again & unfortunately I can still not replicate the issue. After a bit of setup time, I can see the JLink CDC UART Port in the device manager of Windows. Which version of the 52840 DK do you have? Do you have another 52840 DK that you could test with? Are you connecting one USB cable to the J2 on the DK & one other USB cable to the nRF USB connector on the DK? Is the nRF Power Source switch in the VDD position? These two cases may also be helpful: link 1, link 2.

[Bjørn Kvaale]

It seems there are still some issues regarding usb on the v0.9.3 52840 PDK (see answer here). I tested with a v1.0.0 52840 DK, which worked fine. I have sent you a PM on DevZone.

[Jimmy@zone]

The new board work ! Thanks 

[Bjørn Kvaale]

Great to hear!