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mb2-lsm-gpio: demonstrate MB2 LSM303AGR interrupts

Bart Massey 2024

This code shows how to take a LSM303AGR IMU interrupt on the MicroBit v2.

Part of it is pretty straightforward. The LSM303AGR IMU has an interrupt output that is connected to a GPIO pin on the MB2. Enabling that interrupt allows the IMU to notify the MB2 when it should pay attention.

However, this interrupt pin is shared by the Interface MCU (IMCU) on the MB2. At program startup the IMCU needs to release the pin so that the IMU can interrupt with it. This turns out to be a bit buggy.

Acknowledgements

Thanks to the students of PSU CS 410P/510 Rust Embedded Winter 2024 that did most of the work of figuring stuff out.

Thanks to the microbit-v2 and lsm303agr crate authors for fantastic work.