Commits on May 18, 2024

1. Add support for embedded-hal-async …

   Now that the `embedded-hal-async` crate has released version 1.0, it
   would be nice to be able to use the async versions of `embedded-hal`'s
   traits for writing drivers for Sensirion I2C devices. This commit adds a
   new `i2c_async` module which provides versions of the APIs in the `i2c`
   module that use `embedded-hal-async`'s async `I2c` trait rather than
   `embedded-hal`'s blocking `I2c' trait.
   
   The new module is feature-flagged, so that users who don't need
   `embedded-hal-async` support can avoid the additional dependency, and
   it's off by default. Ideally, it would be nice if the blocking
   `embedded-hal` APIs could also be feature-flagged, so that async-only
   users don't have to pull them in, but that would be a breaking change.
   I've also taken the liberty of adding support for the `doc_cfg` and
   `doc_auto_cfg` RustDoc features when building on docs.rs, so that the
   documentation displays that the new module is feature-flagged.
   
   I've changed the `Error` type to require that `I:
   embedded_hal::i2c::ErrorType` rather than `I: I2c`, so that errors
   returned by `embedded_hal_async::i2c::I2c` can also be used here. This
   shouldn't be a breaking change, as far as I can tell, because `I2c` has
   a `ErrorType` bound, and all types that implement `I2c` must also
   implement `ErrorType` --- all the same types should still be valid here.
   
   Closes Sensirion#24

   

   hawkw committed May 18, 2024
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