Memory Watch Unit : Who implements MWU_IRQHandler?

[himanshu pande]

Dear Nordic Team,

I am trying to use the MWU to safeguard RAM of my application. Since softdevice also use this unit, I wanted to understand that where I can write the code for handling events when MWU detects them?

If I implement, MWU_IRQHandler in my application, what about softdevice's internal protection mechanism?

Regards,

Himanshu.

[Vidar Berg]

Hi,

The MWU should not be used when the softdevice is enabled. Have you considered using the MPU instead? We are using this for our "stack guard" implementation. 

Regards,

Vidar

[himanshu pande]

Thank you Vidar for your quick response. Would you say the same thing is true for BPROT as well? Can I use it when softdevice is enabled or not?

I will look into stack guard for our RAM protection requirements.

[Vidar Berg]

BPROT is replaced by the ACL on nRF52840. You can use the ACL while the softdevice is enabled as long as you use the sd_protected_register_write() API.

[himanshu pande]

Our project uses the nrf52832. What would be the solution there instead of BPROT?

[Vidar Berg]

Yes correct, use BPROT if you use 52832. The question was tagged with nRF52840 which is why I mentioned ACL.