https://devzone.nordicsemi.com/f/nordic-q-a/125314/custom-nrf52840-usbHello, I am developing a product with the nrf52840 + npm1100 for battery management. I added a usb connection for serial communication, connected as suggested by the reference design of the npm1100 ( https://docs.nordicsemi.com/bundle/nwp_040/page/WPen-USTelligent Community 13Mon, 03 Nov 2025 08:15:22 GMThttps://devzone.nordicsemi.com/thread/553116?ContentTypeID=1Mon, 03 Nov 2025 08:15:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:69c72f0c-c44e-492e-a884-a68f056fafdfH&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>I took the subsys/usb/testusb sample, and compiled it with the &quot;npm1100_ek&quot; shield:</p> <p><pre class="ui-code" data-mode="text">west build -b nrf52840dk/nrf52840 -- -DSHIELD=npm1100_ek</pre></p> <p>&nbsp;</p> <p>Alternative is to do this in vscode:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1762157672877v1.png" alt=" " /></p> <p>This shall compile out-of-the-box without any errors.</p> <p>&nbsp;</p> [quote user=""]I added a usb connection for serial communication, connected as suggested by the reference design of the npm1100[/quote] <p>Can you share exactly what you added/changed?</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>