FDS and softdevice SDK14

[Guillaume76]

Hello,

I'm using the SDK 14 and the FDS library.

I'm a bit confused about one thing : FDS uses Flash Storage to write to flash. Since SDK14 Flash Storage can work with the softdevice flash API regardless of its status enabled or disabled. But in the documentation, the usage section of FDS specify that we need to initialize the softdevice first. And the nfc writable_ndef_msg example does initialize the softdevice first.

So do you confirm that we need to initialize the softdevice before using FDS ? If yes what is the reason behind ? I've tested FDS without enabling the softdevice and it seemed to work fine.

Thanks

Guillaume

[Petter Myhre]

It depends on what backend you want Fstorage to use. You can use NVMC peripheral or SoftDevice flash API as backend. See this.

FDS_BACKEND tells FDS which backend Fstorage should be using.

If SoftDevice flash API is to be used as backend, you must initialize the SoftDevice before initializing FDS.

[Guillaume76]

Thanks for your answer. I'm indeed using the softdevice API as backend, but the Fstorage documentation says this about the softdevice API backend => " Can be used anytime the SoftDevice is present, regardless of its status (enabled/disabled)." (here) So I'm wondering why do we have to enable the softdevice if we use fstorage with fds but not if we use fstorage directly.

[Petter Myhre]

I looked into it a bit more, this is actually an error in the documentation. The SoftDevice doesn't have to be enabled before you init FDS. It is however recommended to have it enabled, this is because this is how Fstorage have been most thoroughly tested. Hope that clears things up. I have reported this internally, to make the FDS documentation clearer that is.

[Guillaume76]

ok thank you!