nRF5 SDK with SoftDevice and RTOS

[silvio3105]

Hi,

I'm setting up the project(VS Code + Make + ARM-GCC) for nRF52840. The project will use nRF5 SDK(not new with Zephyr) and softdevice(both BLE roles).

Until now I've been using CMSIS RTX5 and I like it. I found few topics here on DevZone that RTX is not supported because of interrupts. So, I've been looking for "modified" FreeRTOS in nRF5 SDK v17.1.0 and I cannot find it. Where I can find FreeRTOS that will work with soft device?

The project will not use round robin scheduler, it will use co-operative where each task will switch to next task. No ciritical sections. I would be happy if I can use RTX with coop scheduler.

Thanks.

 

[Susheel Nuguru]

Other RTOS cannot use SVC when softdevice is enabled. The Nordic SoftDevice (which is a precompiled binary stack) takes over certain system resources, including the SVC interrupt, which it uses for internal operations.If another component (like RTX5) modifies the SVC handler after the SoftDevice is enabled, it can cause a HardFault.