How to configure NVIC interrupt priorities?

[Frikkie Badenhorst]

Hi there, 

We are new to Zephyr, and as a test we are currently porting our existing application onto Zephyr from a different OS. Have gone through the NRF SDK Fundamentals course quite recently (ncs 2.5.1).

It seems as if when you configure a peripheral (with interrupts) using the sdk, you never specify the interrupt priority? I assume "under the hood" a default priority is then selected, and all peripherals then run at the same interrupt priority. Can you please advise how we can configure interrupt priorities and point to some documentation?

Also, can any priority level be selected, or are certain priority levels reserved by Zephyr? Any documentation on interrupts will be appreciated.

Regards,

Frikkie

[Frikkie Badenhorst]

Also please advise whether hardfaults etc are enabled by default and where the hardfault handlers are defined.

[Amanda Hsieh]

Hi,

Can you please advise how we can configure interrupt priorities and point to some documentation?

See the example in this post and https://github.com/nrfconnect/sdk-zephyr/blob/2a88dad0458cf2fd4f9f62ffe3c464fbd6db9919/dts/arm/nordic/nrf52840.dtsi#L102 

Doc: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.2/zephyr/build/dts/api/api.html#interrupts-property 

Frikkie Badenhorst said:

please advise whether hardfaults etc are enabled by default and where the hardfault handlers are defined.

Not sure if I understand the request correctly or not. 

You can try to enable this in prj.conf:

CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_LOG=y

Then you should be able to see more information about the hard fault.

You can use the arm-none-eabi-addr2line command to look up the faulting instruction address.

Regards,
Amanda H.