Upgrading project from nRF51 with SDK8 to nRF52 with SDK14

[Bisqwit]

Hi! We've got a nRF51 based device where the firmware was developed on SDK version 8 (reportedly based on its hrs_c example) with S110 softdevice.
We are now developing a new version of the hardware based on nRF52. It is a good time to also upgrade the SDK version to the most recent one.

We are faced with two challenges: nRF51 --> nRF52, and SDK 8 --> SDK 14. And, I guess, S110 --> S140…ish? I am admittedly a bit hazy still on how this scheme works.
It would be nice if these can be done in two steps, so that we can e.g. verify on the old hardware that the SDK upgrade has been successful, to not have to troubleshoot two issues simultaneously. However, it seems that SDK8 does not support nRF52, and SDK14 does not support nRF51. SDK12 seems to be the last version to support nRF51.

However, judging from the fact that the diff between their respective examples/ble_central/ble_app_hrs_c/main.c files weighs over 900 lines, the differences between SDK12 and SDK14 seem extremely major, so there would be significant of work in first porting the firmware to SDK12 and then further porting it to SDK14.

Am I mistaken? How do you recommend I should proceed?

[Nguyen Hoan Hoang]

Better write a new firmware completely than trying to migrate.  There is a library that could help writing BLE firmware easier. 

[tesc]

Hi,

There has been a lot of changes since SDK v6 up to the now current nRF5 SDK v15. You are most likely best off by starting a new project in SDK 15 and porting/adding one feature at a time from the old project. Nine stepwise migrations from one version to the next is not an option.

Regards,
Terje

[aj1]

Thank you. I had suspected that step wise migration might be difficult, so I appreciate you confirming that.

[aj1]

Thank you!