RE: Questions about NCS hardware interrupt time and SPI

Håkon Alseth — Fri, 27 Sep 2024 13:38:21 GMT

Hi,

Do you have any log output or similar that shows the problem?

Any code to reproduce this issue?

What is the state of your firmware after this 68 bytes are read?

[quote user=""]Second question, using SPIM in NCS will turn on EASYDMA by default, so will executing spim to read data in interrupt take up MCU resources?[/quote]

It will read/write according to the supplied buffers, and provide an event back when it is done. If it is setup in a synchronous way, it will go to idle and wait for the event to come back.

[quote user=""]The third question, if the execution of spim will occupy MCU resources, is it possible to enable PPI + GPIOTE + SPIM to avoid the problem of time limit in interruptions? If I can, I just have to build this way, will read the data placed with RAM, is not able to completely avoid MCU resources. That way I can add other items like LCD and data algorithms[/quote]

Yes, but this will require the use of the nrfx_spim driver directly. I would recommend that we look into the initial issue first before considering this option.

Kind regards,

Håkon