Why can't I keep using S110/120 devices on nrf52840?

[Mitch996]

It appears that I must use S134 and S140 etc. Is it backward compatible? By that I mean I keep using S110/120 at the cost of not being able to utilize some of the latest feature?

[Wojtek]

S110/S120 is compiled for nRF51 devices - You just cannot use it on nRF52. BUT the api is not so different - just needs some small fixes to keep it working...

[Mitch996]

Thank you Wojtek, hope you don't mind telling me where to start, are those "small fixes" detailed in one of these packs? developer.nordicsemi.com/.../

[bjorn-spockeli]

@Mitch996: Yes, the S110 and S120 are not compatible with the nRF52840, this is clearly stated in the nRF52840 Compatibility Matrix, found here. Could you elaborate on why you would like to use the older S110/S120 SoftDevices over the latest S140 ?

[Wojtek]

I have not worked with nRF52840 yet, but I assume its SD has similar API to newest nRF52832 API. I won't give you exact steps what lines you should change, but I can suggest you to just compile it with the api you were using before (i assume you want S110/S120 because you have used it before?). If something won't work, you will fix it. Also, you should read nrf51->nrf52 migration guide available somewhere on infocenter. You could just also take any nRF52 example available in SDK and build your app on top of it...

[Mitch996]

Thank you Wojtek, this is what I am doing now. There doesn't appear to be a more "proper" or "clever" way of doing it at this point...