RTOS on NRF53

[Riaan]

Hi,

I am looking to develop some code on NRF53. Looks like only Zephyr is supported. Even the most basic example includes some Zephyr files/libs.

 Reading the docs it sounds like there is a way to use the softdevice without Zephyr. Is there a guide to this, or even just a "hello world" that does not include Zephyr?

I would like to use something like FreeRTOS.

[Kenneth]

You may look at this thread:
https://devzone.nordicsemi.com/f/nordic-q-a/70580/softdevice-controller-example-code

It should be possible, but not something we have tested or made any examples for. We hope zephyr will cover the needs of the many. 

[Bruno Saraiva]

Hi Kenneth,

I don't want to spin the talk off the main subject on this thread, might post a separate one. But one example happening right now is I2C with multiple devices in one bus, one of them being a display controlled by LVGL drivers. We get several i2c_nrfx_twim: Dev I2C_1 errors, which seem to be I2C conflicts between devices... solved a similar problem in the other I2C bus adding our own semaphores to prevent devices to battle for the bus, but LVGL does not let that... But it makes no sense that a complete RTOS such as Zephyr would allow I2C bus conflict, it's probably something wrong on our configurations - but we've ran in circles for several days now without being able to find documentation to guide on this...

I guess a summary on the original topic is that we would not look elsewhere (FreeRTOS) if the examples were clear and related to real world applications, such as an I2C with multiple devices, projects with APP, APPNS and NET cores that require multiple .dts files when examples and tutorials keep saying "it's simple, you use THE dts file", and so on.