https://devzone.nordicsemi.com/f/nordic-q-a/55007/how-to-use-dma-for-fatfs-spi-spi0Hello! As the title suggests, I want to know how to use DMA with fatfs. It is defined like this, but now is fatfs using DMA? It takes 18ms to write 512 bytes with f_write when writing to the SD card. Thank you!en-USTelligent Community 13Tue, 03 Dec 2019 00:57:26 GMThttps://devzone.nordicsemi.com/thread/223172?ContentTypeID=1Tue, 03 Dec 2019 00:57:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8515dda-8020-4eb4-9881-abf30474a015y001<p><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">Thank you for your reply.</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">&ldquo;APP_SDCARD_SPI_INSTANCE&rdquo; is set to &ldquo;0&rdquo;.</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">Also, app_sdcard.c uses that instance, so you can probably use DMA.</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">Thank you very much.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/222986?ContentTypeID=1Mon, 02 Dec 2019 10:15:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:07a3b2b5-a0cb-40e5-bd57-66c913e76a59J&#248;rgen Holmefjord<p>Hi,</p> <p>Yes, these configurations should be sufficient for the SPI master driver to use EasyDMA SPIM peripheral for SPI master instance 0. If you also have set&nbsp;APP_SDCARD_SPI_INSTANCE to 0, this instance should be used by FatFS.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>