https://devzone.nordicsemi.com/f/nordic-q-a/114318/how-to-send-7k-bytes-of-data-using-usb-in-custom-boardHi, I am using nRF52840 and nRF Connect SDK V2.6.0 I want to send 7000 bytes of data using USB at a time. Now I am able to send only 1024 bytes at a time. I modified USB CONSOLE sample and using uart_fifo_fill(); I am sending the data to PC Thank youen-USTelligent Community 13Thu, 29 Aug 2024 08:32:38 GMThttps://devzone.nordicsemi.com/thread/500370?ContentTypeID=1Thu, 29 Aug 2024 08:32:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:13399ec8-5d19-45f4-8225-5fcf4b52f90dPriyanka<p>Hi,</p> <p>You can see from<a href="https://docs.nordicsemi.com/bundle/ps_nrf52840/page/usbd.html#ariaid-title19:~:text=The%20internal%20buffer%20also%20sets%20the%20maximum%20size%20of%20the%20ISO%20OUT%20and%20ISO%20IN%20transfers%3A%201023%20bytes%20when%20the%20full%20buffer%20is%20dedicated%20to%20either%20ISO%20OUT%20or%20ISO%20IN%2C%20and%20half%20when%20the%20buffer%20is%20split%20between%20the%20two."> the documentation</a> that the maximum size of an ISO IN transfer &amp;<span>&nbsp;isochronous OUT transfer</span> in USB full-speed is 1023 bytes. So unfortunately you won&#39;t be able to send 7000bytes at a time using the USB interface. But maybe you can send them in chunks of bytes and send them one by one.</p> <p>-Priyanka</p><div style="clear:both;"></div>