https://devzone.nordicsemi.com/f/nordic-q-a/105016/nrf52840-non-com-usb-comnication-with-pcHi i got question about using USB. I want to create USB device that communicates with pc. But when I use COMs it doesn&#39;t work properly. CURA Slicer opens this COM and blocks it for other programs. And connecting device via COM seems kinda sketchyen-USTelligent Community 13Wed, 25 Oct 2023 10:38:45 GMThttps://devzone.nordicsemi.com/thread/452223?ContentTypeID=1Wed, 25 Oct 2023 10:38:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:69437347-31c2-47ec-b7c9-bf5fc98f1a18ovrebekk<p>Hi&nbsp;</p> <p>It is technically possible to configure the nRF52840 as a simple libusb/winusb device, allowing you to interface it from the PC without using the CDC class, but I would strongly advice against it.&nbsp;</p> <p>We have no examples showing you how to do this, so you would most likely have to spend a lot of time to get it working.&nbsp;</p> <p>Internally we use the CDC class for a lot of different applications (bootloaders, the nRF Sniffer, nRF for Desktop Bluetooth application ++) and have good experiences with it.&nbsp;</p> <p>I would recommend trying to figure out why your CURA Slicer software is opening comports automatically instead, so that you can use CDC on the nRF52840 without problems. I found a forum thread that discusses this, and provides some advice:<br /><a href="https://community.ultimaker.com/topic/32847-com-port-connection/">https://community.ultimaker.com/topic/32847-com-port-connection/</a></p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>