1fbb8f0b32
A while ago `OutputOpenDrain` was made to implement `InputPin`, something that allowed drivers for various one-wire protocols to be written, but it's been lacking a `Wait` implementation — something that's needed to write async versions of these drivers. This commit also adds `get_level()` to `OutputOpenDrain`, since `is_high()` and `is_low()` were already implemented, but `get_level()` itself was missing.