IMX6UL SPI DMA Example

ryanshuttlewort — Tue, 25 Jul 2017 22:02:52 GMT

Hello all. I am looking for an up-to-date example of how to perform SPI DMA at sample rates >= 128ksps on the imx6ul under Linux 3.14.52. I have reviewed the discussion at https://community.nxp.com/message/886376?commentID=886376#comment-886376 but the code is old, uses SDMA and doesn't support the imx6ul. I have also managed to get IIO working, however, the trigger system appears to be slow and inconsistent in timing and I am hoping DMA would be a more suitable approach.

Any advice other than RTFM would be appreciated.

Thanks.

Re: IMX6UL SPI DMA Example

igorpadykov — Tue, 25 Jul 2017 23:16:19 GMT

Hi Ryan

one can look at SDK examples:

Board Support Packages (7)
SDK2.2_iMX6UL_WIN(REV SDK2.2)
http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-processors/i.mx-6-processors/i.mx-6ultralite-processor-low-power-secure-arm-cortex-a7-core:i.MX6UL?tab=Design_Tools_Tab

../boards/evkmcimx6ul/driver_examples/ecspi/sdma_b2b_transfer/master/ecspi_sdma_b2b_transfer_master.c

Best regards
igor
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