RE: Multiple Device Tree SPI definitions for a single hardware interface

Kenneth — Thu, 18 Mar 2021 13:32:15 GMT

The main problem here is that when using the zephyr spi drivers, then the configuration is static during compilation. It's not really been designed to dynamically adjust or update pins run-time. So if you need spi functionality on two set of pins, then you would need to use two instances of spi in zephyr. I believe a good starting point for using the zephyr spi driver may be these pages:
https://devzone.nordicsemi.com/nordic/nrf-connect-sdk-guides/b/peripherals/posts/adding-a-peripheral-to-an-ncs-zephyr-project
https://devzone.nordicsemi.com/f/nordic-q-a/70627/what-s-the-official-way-to-implement-a-simple-peripheral-spi-i2c-etc-with-ncs/290615#290615

It's possible to overcome the above limitation by using nrfx_spim directly, then you can dynamically change this in run-time as on the old nRF5 SDK. You can find an example here on how to use nrfx_spim directly (also make sure to check the configuration in prj.conf):
https://devzone.nordicsemi.com/f/nordic-q-a/66488/using-spi-with-ppi-in-zephyr/272139#272139

Hope that helps,
Kenneth