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iMX6UL SPI transfer speedup

Question asked by Ian Craig on May 9, 2018

Hi

 

I have a small TFT display connected to my iMX6UL board and I'm using the SPI interface to transfer the data. I have everything working but I'm looking to increase the data transfer speed. The 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  a total of 138240 bytes.

 

Does anybody have any ideas on how to decrease this gap?

spi transfer

 

Thanks

Ian

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