Using SPI3 and UART3

[Julien]

Hi,

I prepare my custom board on nrf5340, and i have to use 3xUART, 1xI2C, 1XSPI.

Regarding product specification, i see i cannot configure more than 4 (UART,SPI,I2C).

But in my projetc i will never use in same time spi and my third uart link. It will depend on wich device i will be linked and then by cellular, i will receive a configuration to choose spi or uart.

How could it be manager on dts and code source to disable a link (SPI/UART) and enable the other link(UART/SPI).

In my case, i will be spi3 or uart3.

Best Regards,

Julien

[Kazi Afroza Sultana]

Hello,

You can not use the same peripherals simultaneously which share same ID. 

https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/memory/appmem.html?cp=4_0_0_4_2_0#instantiation 

I have talked to team and got the following feedback.

The current driver model in Zephyr/NCS does not support peripheral resource sharing. Only solution as of today, is to disable these peripherals in dts, and use nrfx API directly.

We have a sample for that here:
https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/boards/nrf/nrfx_prs

Note that when you use nrfx directly, that in addition to handle the switching in the application between the two interfaces, you must also write your own implementation that handle the spi/i2c communication, since you can't use the zephyr api/driver in this case.

[Julien]

Thanks for the answer