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401: Add OpenDrainIO pin state (with InputPin capability) r=jonas-schievink a=Finomnis As already reported in #339, there is currently no way to create an I/O pin in nrf-hal. There are several reasons why having this would be useful. My personal usecase is the DHT22/AM2302 sensor. Controlling it requires a single-wire pulled-up open drain IO. Sadly, this means that all libraries that can interface with it [require `InputPin + OutputPin`](https://docs.rs/dht-sensor/0.2.1/dht_sensor/trait.InputOutputPin.html). # Solution There is no inherent reason why nrf chips shouldn't be able to implement this. The input buffer is always available and allows reading back the pin values during every pin configuration. Although for energy saving reasons, the input buffer is currently disabled during the `OpenDrain` state. My proposal is to add an `OpenDrainIO` state that does not disable the input buffer and implements `InputPin`. Co-authored-by: Finomnis <[email protected]>
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