Implementation of Periodic SPI Operations with nrfx

[BENBF]

Good evening,

I would like to execute an SPI operation every 20ms using an interruption. I saw that it was recommended utilizing nrfx timer and PPI to achieve this, ensuring that the SPI writing process does not encounter timeouts. But I have difficulties implementing this solution, and don't manage to find a lot of documentation about it, and online samples seem to be a bit outdated.

Would you be able to help me implementing this, either with a small sample or some guidelines? Thank you very much and have a good day.

[BENBF]

Hello,
Thank you for your answer.

I'm using IRQ_DIRECT_CONNECT() to declare my 50Hz timer.
Unfortunately, as my SPI transactions are quite long, it triggers a timeout when I'm performing them directly from the timer handler function. This is why I tried to offload those transactions with another thread.

The observed behaviour is that the SPI thread is not activated every time the timer IRQ is fired and I don't understand why. The observed behaviour remains the same even if I lower the timer frequency.

Do you know if there is a way to access thread scheduler information or to force it to update itself in order to be sure that my SPI thread is indeed the next one to be performed when the timer IRQ occurs ?

Best regards

[Kenneth]

The first I would try is whether the code you shared works as intended when using IRQ_CONNECT() instead of IRQ_DIRECT_CONNECT().

Kenneth

[BENBF]

It seems that it works as intended when using IRQ_CONNECT() instead of IRQ_DIRECT_CONNECT().

Thank you,
Best regards