Can you use NRF PPI and FreeRTOS together

[George Sykes]

Hi,

I'm reading through the documentation on using the SAADC with the NRF52 kits. The examples are using PPI to manage the SAADC and allow it to sample locationally in a non blocking way. I am planning on using FreeRTOS however to manage the boards other processes. Are FreeRTOS and PPI compatible with each other. If so what is the difference between them and why should i add the complexity of having the PPI scheduling system happening parallel to the FreeRTOS as surely it would be cleaner for everything to be managed by FreeRTOS.

[Vidar Berg]

Hi,

It's completely optional to use PPI, and whether it makes sense to use it or not depends a bit on use case. For low frequency sampling it may be easier to trigger the sampling periodically from a freertos task or a timer event.

PPI triggers peripheral tasks without involving the CPU, so it doesn't really make any difference if you run a bare metal application or an RTOS.

Driver documentation for reference: SAADC driver

Best regards,

Vidar