https://devzone.nordicsemi.com/f/nordic-q-a/80259/sdk-17-1-0-libuarte---tx-buffer-handlingHi, After years of working with nrf_serial, we are starting a new project and want to use the lastest and greatest SDK and get rid of legacy drivers. libuarte is tempting because of its use of DMA. When working with libuarte, I came up with a couple ofen-USTelligent Community 13Mon, 04 Oct 2021 14:42:43 GMThttps://devzone.nordicsemi.com/thread/332403?ContentTypeID=1Mon, 04 Oct 2021 14:42:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ea4631f3-7d65-4ad8-86c0-1a98f8319bbaNorbert<p>OK, thanks. I&#39;ll add a wrapper around libuarte then which will do the TX buffer handling.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/332396?ContentTypeID=1Mon, 04 Oct 2021 14:15:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d8b388fe-68ab-4d2b-9528-f7a33ad5e2e5Sigurd<p>Hi,</p> <p>Yes,&nbsp;your theory looks correct. The location of the data buffer you provide to nrf_libuarte_async_tx(), is the same as is used directly by the UARTE HW.&nbsp;&nbsp;</p> <p><img height="196" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/8512.pastedimage1633356660711v1.png" width="284" alt=" " /></p> <p>As mentioned in the UARTE chapter in the PS, <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fuarte.html&amp;anchor=concept_l5y_hcm_wr">https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fuarte.html&amp;anchor=concept_l5y_hcm_wr</a>&nbsp;, this&nbsp;pointer needs to point to RAM. (<span>If the TXD.PTR and the RXD.PTR are not pointing to the Data RAM region, an EasyDMA transfer may result in a HardFault or RAM corruption.</span>)</p><div style="clear:both;"></div>