MICROBIT

microbit yotta bluetooth
Look here for in depth info on bluetooth and the DAL
See also for alternative languages

bbc microbit features
micropython
The BBC micro:bit uses a proprietary short-range wireless interface based on the Nordic Gazell protocol, which is built upon the Nordic nRF51 software development kit, for its radio communication.

mbed debug-microbit

BBC microbit breakout connector

Note: The micro:bit's processor is based on the Nordic nRF51.

edgeconnector
use micro bit with Arduino

edge connector tech details
see also

more info
dfrobot

YouTube - could be useful

comprehensive rust/bare-metal
starting with cargo (rust)
Then : Cargo build
and
Then : Cargo run

OR
Embedded Rust

microbit-arduino

microbit-magnetometer

Thu Dec 19 18:39:06 2019
Sometimes something is donated but on receipt, it appears not to work. In this example, it was a bedside radio. The manual may not be present and the item may be too old to find on the internet. So the dismantling process is started. The item may be composed of many sub-modules and some of them may be identifiable electronic sub-units such as keypads, rotary controls for volume, motors (DC or stepper) and so on.

Microsoft makecode website
for Loop Trial