Regarding nordic SPI driver implicitly using DMA

RE: Regarding nordic SPI driver implicitly using DMA

Karl Ylvisaker — Mon, 17 Jan 2022 12:07:32 GMT

No problem at all - I am happy to help, Ubaid!

Please do not hesitate to open another ticket if you should encounter any issues or questions in the future.

Good luck with your development!

Best regards,
Karl

RE: Regarding nordic SPI driver implicitly using DMA

Ubaid_M — Mon, 17 Jan 2022 11:28:31 GMT

[quote userid="87869" url="~/f/nordic-q-a/83714/regarding-nordic-spi-driver-implicitly-using-dma/347994#347994"]there is no way to disable EasyDMA for the SPIM peripheral[/quote]

Thanks Karl,

RE: Regarding nordic SPI driver implicitly using DMA

Karl Ylvisaker — Mon, 17 Jan 2022 11:10:48 GMT

[quote user="Ubaid_M"]Just for the sake of understanding, How can I disable EasyDMA, from SPIM.?[/quote]

Thank you for clarifying. As mentioned, there is no way to disable EasyDMA for the SPIM peripheral, so if you intend to not use EasyDMA you will have to use the legacy SPI peripheral instead, if available.

Best regards,
Karl

RE: Regarding nordic SPI driver implicitly using DMA

Ubaid_M — Mon, 17 Jan 2022 10:52:24 GMT

Hello Karl,

[quote userid="87869" url="~/f/nordic-q-a/83714/regarding-nordic-spi-driver-implicitly-using-dma/347980#347980"]Is your intention to avoid using EasyDMA in your application?[/quote]

Just for the sake of understanding, How can I disable EasyDMA, from SPIM.?

Thanks,

Ubaid

RE: Regarding nordic SPI driver implicitly using DMA

Karl Ylvisaker — Mon, 17 Jan 2022 10:29:42 GMT

[quote user="Ubaid_M"]Thanks for the confirmation[/quote]

No problem at all, I am happy to help!

[quote user="Ubaid_M"]

compatible = "nordic,nrf-spis"

compatible = "nordic,nrf-spim"

Than it implies I am also using EasyDMA.

[/quote]

Yes, when using the SPIM or SPIS peripheral they will always use easyDMA.
Is your intention to avoid using EasyDMA in your application? If so, could you elaborate on this requirement / constraint?

Best regards,
Karl

RE: Regarding nordic SPI driver implicitly using DMA

Ubaid_M — Mon, 17 Jan 2022 10:24:58 GMT

Hi Karl,

Thanks for the confirmation, so I am to understand that in the compatible property, if I am using:

compatible = "nordic,nrf-spis"

compatible = "nordic,nrf-spim"

Than it implies I am also using EasyDMA.

I am using nrf52833_dk device.

Thanks,

Ubaid

RE: Regarding nordic SPI driver implicitly using DMA

Karl Ylvisaker — Mon, 17 Jan 2022 08:40:52 GMT

Hello Ubaid,

The SPIM and SPIS peripherals use easyDMA explicitly - there is no other option. The drivers for these specific peripherals thus has no influence on the usage of easyDMA.
I do not know which device you are working with, but you could read more about this in the respective device's Product Specification under Peripherals -> SPIM -> EasyDMA.

Best regards,
Karl