nRF5340 GPIO Interrupt speed

[zuppiden]

Hello Everyone

I have an Interrupt Signal at 8MHz after which I need to execute some stuff.
I set up an Interrup on an GPIO Pin to test it but at around 4MHz the nRF5340 won't detect anymore interrupts (not just missing some but straight up stops detecting any).
Is it possible to dectect faster Interrupts by using the Application Core with 128MHz?

If so how can I:
-  Check at what frequency the nRF5340 is running
-  Set the frequency to 128MHz

if not:
-  How many normal SPI lanes can be active at the same time?

I looked around in the docs and even tried to write to the registers directly but without success.

Thanks for your help

[Kenneth]

The peripherals (e.g GPIO, PPI tasks and events) are typically running on 16MHz. It will be difficult to continuously do much processing if you have an interrupt of 8MHz. It would be interesting to know what kind of processing you intend for each 8MHz interrupt. The peripherals can run in parallel.

Kenneth

[zuppiden]

I am trying to read the logical state of 8 GPIO Pins after an interrupt and store that.
But if the peripherals run at 16MHz an interrupt of 8MHz should be possible, or not?

[Kenneth]

I believe if you use nrfx_gpiote driver directly (IN event to trigger the interrupt, not PORT event) you should be able to achieve interrupt of 8MHz yes. You can find an example of using gpiote here.

Kenneth