i.MX ProcessorsのトピックiMX6UL SPI transfer speedup https://community.nxp.com/t5/i-MX-Processors/iMX6UL-SPI-transfer-speedup/m-p/738136#M114870 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>I have a small TFT display connected to my iMX6UL board and&nbsp;I'm using the&nbsp;SPI interface to transfer the data. I have everything working but I'm looking to increase the data transfer speed. The&nbsp;SPI transfer is using DMA but when I look at the data transfer signals on a scope there is a significant gap between each 64-byte transfer. You can see this in the image below. A 64-byte transfer takes around 30uS and there is a 15uS gap before the next transfer takes place. This is all happening within the DMA transfer which is transferring&nbsp; a total of 138240 bytes.</P><P></P><P>Does anybody have any ideas&nbsp;on how to decrease this gap?</P><P><span class="lia-inline-image-display-wrapper" image-alt="spi transfer.jpg"><img src="https://community.nxp.com/t5/image/serverpage/image-id/765i43B23194E8146DE0/image-size/large?v=v2&amp;px=999" role="button" title="spi transfer.jpg" alt="spi transfer.jpg" /></span></P><P></P><P>Thanks</P><P>Ian</P></BODY></HTML> Wed, 09 May 2018 12:48:25 GMT IanCraig 2018-05-09T12:48:25Z iMX6UL SPI transfer speedup https://community.nxp.com/t5/i-MX-Processors/iMX6UL-SPI-transfer-speedup/m-p/738136#M114870 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>I have a small TFT display connected to my iMX6UL board and&nbsp;I'm using the&nbsp;SPI interface to transfer the data. I have everything working but I'm looking to increase the data transfer speed. The&nbsp;SPI transfer is using DMA but when I look at the data transfer signals on a scope there is a significant gap between each 64-byte transfer. You can see this in the image below. A 64-byte transfer takes around 30uS and there is a 15uS gap before the next transfer takes place. This is all happening within the DMA transfer which is transferring&nbsp; a total of 138240 bytes.</P><P></P><P>Does anybody have any ideas&nbsp;on how to decrease this gap?</P><P><span class="lia-inline-image-display-wrapper" image-alt="spi transfer.jpg"><img src="https://community.nxp.com/t5/image/serverpage/image-id/765i43B23194E8146DE0/image-size/large?v=v2&amp;px=999" role="button" title="spi transfer.jpg" alt="spi transfer.jpg" /></span></P><P></P><P>Thanks</P><P>Ian</P></BODY></HTML> Wed, 09 May 2018 12:48:25 GMT https://community.nxp.com/t5/i-MX-Processors/iMX6UL-SPI-transfer-speedup/m-p/738136#M114870 IanCraig 2018-05-09T12:48:25Z