Beat Küng 83b6f6456b refactor I2CSPIInstance: store running instances in a global linked list
instead of a static per-driver array.

Reduces BSS RAM usage by a couple of 100 Bytes (linear increase with num
drivers).

Downsides:
- a bit more runtime overhead
- less isolation, locking required
- a bit more complex
2020-03-17 23:31:17 -04:00
..
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