add FOC and CRT calibration

[gbr1]

Hi!
Using Arduino BLE sense rev2 gyroscope drift is very hard.
I suggest to add the FOC and CRT functions (gyroscope and accelerometer calibration), these could help to improve the sensor fusioning.

Here some links:

• an interesting post in bosch forum
• some complains in arduino forum

thanks!

[kidkoder432]

Is this issue still of interest to devs? I also need CRT calibration.