https://devzone.nordicsemi.com/f/nordic-q-a/52171/about-dmaHello , I use SDK 15.3, chip is nRF52811 If I want to use DMA+SPI, is there a reference example? Is this DMA called easyDMA? Thanksen-USTelligent Community 13Wed, 18 Sep 2019 09:01:26 GMThttps://devzone.nordicsemi.com/thread/210322?ContentTypeID=1Wed, 18 Sep 2019 09:01:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:795d8647-6034-4b88-a680-ae24fb25d70fSimonr<p>Hi</p> <p>Correct, when SPI_USE_EASY_DMA is enabled the SPI transactions will use (Easy)DMA. You should be able to confirm it by seeing a small current increase when EasyDMA is enabled, as opposed to when this is disabled. And yes, this is the only necessary step to enable/disable DMA in the SPI example.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/210249?ContentTypeID=1Wed, 18 Sep 2019 01:21:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3c39735d-720d-4aa9-bfa7-89fb0a06dd67tony55723<p>Hi,</p> <p>Thank you for your&nbsp;reply.</p> <p>I still don&#39;t understand</p> <p>In sdk_config.h, I did find easyDMA</p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/4024.q1.png" /></p> <p>Then, in main.c, the while(1) loop inside the main function</p> <p>Have the following line of code</p> <p><pre class="ui-code" data-mode="c_cpp">nrf_drv_spi_transfer(&amp;spi, m_tx_buf, m_length, m_rx_buf, m_length)</pre></p> <p>This SPI transmission method is DMA?</p> <p>Thank you.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/209856?ContentTypeID=1Mon, 16 Sep 2019 13:23:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2c7050e1-a898-4570-912f-ba9843443c61Simonr<p>Hi Tony</p> <p>Yes, there should be multiple SPI examples in the \..\<span>SDK15.3\examples\peripheral folder, and you should be able to enable DMA (EasyDMA) on all of them using the sdk_config.h file.</span></p> <p><span>Best regards,</span></p> <p><span>Simon</span></p><div style="clear:both;"></div>