NCS internal flash communication with BLE

RE: NCS internal flash communication with BLE

Susheel Nuguru — Mon, 04 Mar 2024 07:09:08 GMT

[quote user="secondbest"]Also, I must be able to save log messages inside ISR like Hardfault[/quote]

Sorry for coming back to you a bit late. I think hardfault is a bit special in where it does not matter to use flash API in the ISR context since we are already in the hardfault handler and there is mostly no recovery apart from resetting.

SDC SOC flash API is very limited in how you can use and there might be implications if it is not called in the right priority as this is MPSL API.

I suggest you still use Settings with the backend of FCB by enabling CONFIG_SETTINGS_FCB. This bodes well with your DFU feature as FCB usage of Settings can be configured in the partition as mentioned here.

[quote user="secondbest"]One more addition, Can I use flash_erase, flash_write functions securely with BLE?[/quote]

No, the low level API in the nRF cannot be used directly when using our softdevice. This is also discussed here

RE: NCS internal flash communication with BLE

secondbest — Wed, 28 Feb 2024 12:07:08 GMT

Hello,

Thanks for settings api suggestion. But, I am saving whole log messages inside internal flash. For this purpose, I am using circular buffer. Also, I must be able to save log messages inside ISR like Hardfault. Do you have any other suggestion for this use case? By the way, I will also have DFU feature so I must create partitions for internal flash.

Also, I found this topic: https://devzone.nordicsemi.com/f/nordic-q-a/95687/using-zephyr-or-nrfxlib-to-manipulate-flash-area However, I cannot find any meaningful usage example.

One more addition, Can I use flash_erase, flash_write functions securely with BLE?

RE: NCS internal flash communication with BLE

Susheel Nuguru — Wed, 28 Feb 2024 08:49:35 GMT

BLE is using settings enabling the CONFIG_BT_SETTINGS. If you want your flash access to be in sync with the operations of BLE, I recommend you to use settings (check the sample for reference).