w5500-ll 0.13.0

Low level driver for the Wiznet W5500 internet offload chip.
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# w5500-ll

Platform agnostic rust driver for the [Wiznet W5500] SPI internet offload
chip.

This is a low-level (ll) crate. The scope of this crate is:
1) Register accessors.
2) Networking data types.

Higher level functionality (such as socket operations) should be built
on-top of what is provided here.

## Example

Reading the VERSIONR register (a constant value).

```rust
use w5500_ll::{eh1::vdm::W5500, Registers};

let mut w5500 = W5500::new(spi);
let version: u8 = w5500.version()?;
assert_eq!(version, 0x04);
```

## Feature Flags

All features are disabled by default.

* `defmt`: Enable formatting most types with `defmt`.
* `eh0`: Enables the [`eh0`] module which contains
  implementations of the [`Registers`] trait
  using the `embedded-hal` version 0.2 traits.
* `eh1`: Enables the [`eh1`] module which contains
  implementations of the [`Registers`] trait
  using the `embedded-hal` version 1 traits.
* `eha1`:
  Implements the [`aio::Registers`] trait for types in the [`eh1`] module
  using the `embedded-hal-async` traits.

[Wiznet W5500]: https://www.wiznet.io/product-item/w5500/
[`aio::Registers`]: https://docs.rs/w5500-ll/latest/w5500_ll/aio/trait.Registers.html
[`aio`]: https://docs.rs/w5500-ll/latest/w5500_ll/aio/index.html
[`eh0`]: https://docs.rs/w5500-ll/latest/w5500_ll/eh0/index.html
[`eh1`]: https://docs.rs/w5500-ll/latest/w5500_ll/eh1/index.html
[`Registers`]: https://docs.rs/w5500-ll/latest/w5500_ll/trait.Registers.html