https://devzone.nordicsemi.com/f/nordic-q-a/86090/nrf52840dk-usb-to-uart-bridgeHi all, I am currently trying to realize a USB to Uart bridge with the nRF52840 development kit. I used an old sample as a starting point for this task namely the &quot; usb _uart_bri dge&quot; which was present in the SDK version 1.4: https://github.comen-USTelligent Community 13Tue, 22 Mar 2022 12:35:08 GMThttps://devzone.nordicsemi.com/thread/359363?ContentTypeID=1Tue, 22 Mar 2022 12:35:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:93ca2fbc-914b-494f-8a4c-c9850131877b&#216;yvind<p>Andreas, I&#39;m happy to hear! Please close if solved.<br /><br />Kind regards,<br />Øyvind</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/359360?ContentTypeID=1Tue, 22 Mar 2022 12:26:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ff0f7aa7-bb20-4053-b899-3b7f03897f08AscherA<p>Hi,</p> <p>I am terribly sorry for the inconvenience. I have found the problem.</p> <p>The problem was the uart_interrupt: &quot;<strong>static void uart_interrupt_handler(void *user_data)</strong>&quot;.</p> <p>In the newer SDk version the interrupt was changed to: &quot;<strong>static void uart_interrupt_handler(const struct device *dev, void *user_data)</strong>&quot;.</p> <p>This fixed the hard fault problem.&nbsp;</p> <p>Regards,</p> <p>Andreas</p><div style="clear:both;"></div>