https://devzone.nordicsemi.com/f/nordic-q-a/77808/usbd-transferhello, i hanve a problem when i use usb transfer data to pc with ep1, sdk 17.0,nrf52840dongle I have many data(more than 100KB) transfer to pc,when I send the data for once,is OK,i want to transfer the data 1K at once in loop, but the pc received dataen-USTelligent Community 13Mon, 26 Jul 2021 06:04:30 GMThttps://devzone.nordicsemi.com/thread/321688?ContentTypeID=1Mon, 26 Jul 2021 06:04:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43eddefb-b3f3-4945-b5e8-7786e63cacf6ovrebekk<p>Hi&nbsp;</p> <p>You mean it works fine when you send a single packet, but not when you try to send multiple packets?</p> <p>Can you tell me why you replaced the&nbsp;<em>app_usbd_ep_transfer(..)</em> call with&nbsp;<em>nrf_drv_usbd_ep_transfer(..)</em>?</p> <p>Which USB example have you used as a starting point for your application?</p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>