/members-area/personalblogs/b/blog/posts/high-throughput-spi-traffic-part-3a---spi-with-dmaWe know SPI as a 4*-wire protocol. But it doesn&#39;t have to be.I&#39;m checking high speed SPI data transfer with buffers, DMA and parallel data lines. In this blog, I use DMA to hand over data to SPI and let it do its own th...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/blog/posts/high-throughput-spi-traffic-part-3a---spi-with-dmaTue, 09 Oct 2018 12:37:50 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:059e5614-2736-4cb0-ad1c-a39ca8a7b12fJan Cumps0<p>I&#39;ve attached the latest version, with SPI DMA fully working. It uses DMA to draw a bitmap half a line at a time, instead of pixel per pixel.</p><p>I&#39;ve also attached the CCS project for the LCD Driver. It&#39;s available on GitHub but the attached project is easier to start from.</p><p>&nbsp;</p><p><span id="9c7fb1a2_9eda_432c_84c1_b3dcdd2752e8"><span>[View:https://players.brightcove.net/1362235890001/NkxiVJdjx_default/index.html?videoId=5846368643001:740:466]</span></span></p><img src="https://community.element14.com/aggbug?PostID=21695&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/high-throughput-spi-traffic-part-3a---spi-with-dmaSat, 09 Jun 2018 21:41:29 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:059e5614-2736-4cb0-ad1c-a39ca8a7b12fJan Cumps0<p>2 years after the facts I finally have the DMA functionality working. Half a line is now sent to the SPI module without CPU involvement.</p><p>The SPI module of the Hercules fetches the image data itself (direct memory access) and transmits it to the LCD.</p><p><span>[View:/resized-image/__size/675x900/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-059e5614-2736-4cb0-ad1c-a39ca8a7b12f/contentimage_5F00_189146.png:675:900]</span></p><p>&nbsp;</p><p>I still need to do some fine-tuning, but glad it works.</p><img src="https://community.element14.com/aggbug?PostID=21695&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/high-throughput-spi-traffic-part-3a---spi-with-dmaSat, 09 Jun 2018 21:13:39 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:059e5614-2736-4cb0-ad1c-a39ca8a7b12ffmilburn0<p>Thanks for outlining this and showing some code.&nbsp; I have used DMA a few times but should look into using it more.</p><img src="https://community.element14.com/aggbug?PostID=21695&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">