Delayed completion of first USB data transfer after microcontroller power-onhttps://devzone.nordicsemi.com/f/nordic-q-a/124700/delayed-completion-of-first-usb-data-transfer-after-microcontroller-power-onI am testing data transfer from a microcontroller to a host PC using USB CDC ACM on the nRF5340. Right after powering on the microcontroller, only the first packet takes longer than usual to complete data transfer. Although I haven’t measured the exacten-USTelligent Community 13Tue, 30 Sep 2025 11:53:18 GMTRE: Delayed completion of first USB data transfer after microcontroller power-onhttps://devzone.nordicsemi.com/thread/550158?ContentTypeID=1Tue, 30 Sep 2025 11:53:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:374dcbe3-08f7-488c-af58-b44de1204eaeKenneth<p>Hi,</p> <p>Having a kind of handshaking mechanism during startup might be a good idea in general. For instance when you power on the chip and connect USB, it will can for instance take several hundreds of ms to startup clocks and to enumerate the USB descriptors and reports with an host USB, so I would say it&#39;s not abnormal that there is a delay on the first packet no.</p> <p>Kenneth</p><div style="clear:both;"></div>