07-uart code refactor

[A-Young-Git]

Context: With recent updates to Rust’s embedded libraries, compatibility issues arose due to older versions of embedded-hal and associated dependencies. This refactor updates the project to utilize the latest libraries, ensuring both compatibility and enhanced functionality.

Key Refactoring Points:

1. Updated Serial Communication:

• Replaced the existing embedded-hal serial interfaces with the updated embedded-hal-nb::nb and embedded-hal-nb::serial modules, as well as embedded-io.

This update aligns the project with the latest embedded-hal standards, enhancing future compatibility and maintaining consistency with the broader embedded Rust ecosystem.

use embedded_hal_nb::nb;
use embedded_hal_nb::serial::{Error as SerialError, ErrorType, Read, Write};
use embedded_io::{Read as EmbeddedIoRead, Write as EmbeddedIoWrite};

2. Refactored Static Buffers:

• Updated tx and rx buffer static constants to utilize core::ptr::addr_of_mut, a safer and more flexible way to handle mutable pointers in Rust’s core library.

This change improves the handling of memory addresses, ensuring a more robust and maintainable codebase, especially in the context of embedded programming where direct memory manipulation is common.

3. Dependency Version Updates:

• Updated all dependencies in Cargo.toml to the latest compatible versions. This includes major updates like embedded-hal moving from version 0.2.6 to 1.0.0 and other libraries such as microbit-v2 and cortex-m.

These updates ensure compatibility with recent Rust releases and align with the latest improvements in the ecosystem.

[humb1t]

This PR helped me to overcome compilation errors from the book. I think it is nice to merge it sooner then later.

[jamesmunns]

Looks reasonable, thanks for the update!

[eldruin]

cc @BartMassey in case some of this needs to be incorporated into the mb2 version.

[BartMassey]

@jamesmunns Thanks! I've been following this, but haven't got around to responding yet. I already rewrote the serial stuff for Discovery MB2, but I'll look at these commits and see what I can figure out.

@humb1t Thanks much for the PR!

[humb1t]

Thanks @BartMassey - the author is @A-Young-Git, so I will forward your thanks to him)

[BartMassey]

Oops. Thanks for the correction.