nRF5340: SPI controlled external RAM

RE: nRF5340: SPI controlled external RAM

Øyvind — Wed, 25 Jun 2025 13:17:44 GMT

Hey Manning,

[quote user="Manning"]et me know if there are any in the list of driver APIs that match the chip I am trying to integrate. If not, then I will work towards creating a custom API for this external RAM chip.[/quote]

I'm not aware of any driver API, but that is more due to the endless possibilities in Zephyr. I would recommend looking into some of the samples that use external flash, e.g. here is some configuration documentation for nRF9160DK external flash or the nRF5340 external flash using QSPI.

Have a look at zephyr/samples/drivers/spi_flash/src/main.c, this might be able to point you in the correct direction. And the flash API here

Good luck!

Kind regards,
Øyvind

RE: nRF5340: SPI controlled external RAM

Manning — Tue, 24 Jun 2025 18:31:30 GMT

Hello Øyvind,

Thank you for your prompt response. I have started looking at the courses you sent me and have started getting a better idea of how Nordic/Zephyr's Device driver model works. To me, it sees like based on the available list of all driver APIs (https://docs.nordicsemi.com/bundle/zephyr-apis-latest/page/group_io_interfaces.html) I don't see any option for a generic SRAM that would match the driver I would be wanting to implement. Let me know if there are any in the list of driver APIs that match the chip I am trying to integrate. If not, then I will work towards creating a custom API for this external RAM chip.

Thank you in advance!

Best Regards,

Manning

RE: nRF5340: SPI controlled external RAM

Øyvind — Tue, 24 Jun 2025 08:20:17 GMT

Hello,

I you are new to our nRF Connect SDK I would suggest starting with our Developer Academy courses, e.g. nRF Connect SDK Fundamentals and nRF Connect SDK Intermediate. These will take you through the world of Zephyr's DeviceTree and how to make your own Zephyr driver.

[quote user=""] I was wondering, is there an SPI controlled RAM driver already implemented in the sdk that is compatible with this chip?[/quote]

There does not currenlty seem to be any support for the 23LC1024 device in nRF Connect SDK/Zephyr, so you might need to make your own drivers for this one.

Kind regards,
Øyvind