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[WIP] Update the microbit part of the book #575

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[WIP] Update the microbit part of the book #575

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Commits on Jun 20, 2024

  1. Update the 02-requirements/README.md 

    Updated to mention the 2021 edition in stead of 2018
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  2. Typo: Change vI to v1

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  3. Update crate versions in 03-setup 

    Cargo.toml:
  * edition             2018 -> 2021
  * cortex-m            0.7.3 -> 0.7.7, added feature `critical-section-single-core`
  * cortex-m-rt         0.7.0 -> 0.7.3
  * rtt-target          0.3.1 -> 0.5.0, removed feature `cortex-m`
  * panic-rtt-target    0.1.2 -> 0.1.3, removed feature `cortex-m`

src/main.rs:
  * To prevent a link error regarding undefined symbols
    (`_critical_section_1_0_acquire` and `_critical_section_1_0_release`)
    I have added `use cortex_m as _;`

The code compiles, and I see the RTT output from cargo embed.
    @nikgul
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  4. Update crate versions in 05-led-roulette 

    Cargo.toml
  * edition             2018 -> 2021
  * microbit-v2         0.12.0 -> 0.14.0
  * microbit            0.12.0 -> 0.14.0
  * cortex-m            0.7.3 -> 0.7.7, added feature `critical-section-single-core`
  * cortex-m-rt         0.7.0 -> 0.7.3
  * rtt-target          0.3.1 -> 0.5.0, removed feature `cortex-m`
  * panic-rtt-target    0.1.2 -> 0.1.3, removed feature `cortex-m`
    @nikgul
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  5. Update the shown examples to reflect the new crate version

    @nikgul
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  6. Update examples to the new crate versions

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  7. Introduce embedded-hal, and refactor to use the OuputPin trait as before 

    The microbit crate apparently don't reexport the hal's OutputPin trail,
there for add embedded-hal as a dependency.
    @nikgul
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  8. Moved the 05-led-roulette light-it-up example to a project example

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  9. Update 05-led-roulette/it-blinks.md to the updated crates

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  10. Moved the 05-led-roulette it-blinks examples to project examples

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  11. Update 05-led-roulette/the-challenge.md to the new crate versions.

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  12. Moved the 05-led-roulette the-challenge example to project examples

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  13. Update 05-led-roulette/my-solution.md and examples/my-solution.rs

    @nikgul
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  14. microbit version 0.15.0 crates has been released 

    A new version of the microbit crates has been released.

Cargo.toml
  *  microbit-v2        0.14.0 -> 0.15.0
     Which updated HAL crates to version 0.18.0
  *  microbit           0.14.0 -> 0.15.0

In connection with this I moved all the examples in the book out of book
text and made them project examples, and used an include statement, like
it's done in `my-solution`, which makes checking the examples faster,
and I also cought a couple of typos I made when I updated the text,
which rust-analyser didn't like.

The examples can be run manually with commands like:
`cargo embed --target thumbv7em-none-eabihf --features v2 --example
it-blinks-1`

Don't know if this messes with any automatic tests yet.
    @nikgul
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