Configuring nRF52840 to Use SPI without DMA on Zephyr

RE: Configuring nRF52840 to Use SPI without DMA on Zephyr

noy_e — Tue, 12 Nov 2024 08:10:38 GMT

Hi,

Thanks for clarifying I was curious why it didn't compile!

The reason for me asking was that I needed to lower the power consumption that is caused by the EasyDMA,

but I realized I can also solve it by using PM and disable the spi instance when it's not in use.

Thanks,

Noy

RE: Configuring nRF52840 to Use SPI without DMA on Zephyr

Simonr — Mon, 11 Nov 2024 13:28:08 GMT

Okay, so the issue seems to be because you're using the SPIM3 instance without EasyDMA. Please note that it's only the SPI0-SPI2 instances that can be used without EasyDMA. The last instance only exists as SPIM3.

But please note that these SPI0-SPI2 instances are also deprecated. Is there a specific reason you don't want to use EasyDMA in your application?

Best regards,

Simon

RE: Configuring nRF52840 to Use SPI without DMA on Zephyr

noy_e — Sun, 10 Nov 2024 05:56:05 GMT

Hi Simon,

It says /soc/spi@4002f000 (it's spi3)

Thank you for your help,

Noy

RE: Configuring nRF52840 to Use SPI without DMA on Zephyr

Simonr — Fri, 08 Nov 2024 09:20:57 GMT

The undefined reference to __device_dts_ord_139 will have a reference point in build\zephyr\include\generated\devicetree_generated.h. In there, you should see a long list of drivers. What does it say next to 139? It could be SPI3, but not necessarily.

Best regards,

Simon