Divide & conquer!
You have 2 entirely separate tasks here:
- How to use the ISM330DHCX IMU:
https://www.st.com/en/mems-and-sensors/ism330dhcx.html
- How to use the X-NUCLEO-BNRG2A1:
https://www.st.com/en/ecosystems/x-nucleo-bnrg2a1.html
Get them working separately first, then bring them together.
The above Product Pages will point you to the resources for each one.
A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
