New VA108xx Rust workspace structure + dependency updates

- The workspace is now a monorepo without submodules. The HAL, PAC and BSP
  are integrated directly
- Update all dependencies: embedded-hal v1 and RTIC v2

va108xx-hal/README.md

@@ -0,0 +1,88 @@
+[![Crates.io](https://img.shields.io/crates/v/va108xx-hal)](https://crates.io/crates/va108xx-hal)
+[![ci](https://github.com/us-irs/va108xx-hal-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/us-irs/va108xx-hal-rs/actions/workflows/ci.yml)
+[![docs.rs](https://img.shields.io/docsrs/va108xx-hal)](https://docs.rs/va108xx-hal)
+
+# HAL for the Vorago VA108xx MCU family
+
+This repository contains the **H**ardware **A**bstraction **L**ayer (HAL), which is an additional
+hardware abstraction on top of the [peripheral access API](https://egit.irs.uni-stuttgart.de/rust/va108xx).
+
+It is the result of reading the datasheet for the device and encoding a type-safe layer over the
+raw PAC. This crate also implements traits specified by the
+[embedded-hal](https://github.com/rust-embedded/embedded-hal) project, making it compatible with
+various drivers in the embedded rust ecosystem.
+
+In contrats to other HAL implementations, there is only one chip variant available here so there
+is no need to pass the chip variant as a feature.
+
+## Supported Boards
+
+ The first way to use this HAL will probably be with the
+ [REB1 development board](https://www.voragotech.com/products/reb1-va108x0-development-board-0).
+ The BSP provided for this board also contains instructions how to flash the board.
+
+ | Crate | Version |
+|:------|:--------|
+[vorago-reb1](https://crates.io/crates/vorago-reb1) | [![Crates.io](https://img.shields.io/crates/v/vorago-reb1)](https://crates.io/crates/vorago-reb1) |
+
+## Building
+
+Building an application requires the `thumbv6m-none-eabi` cross-compiler toolchain.
+If you have not installed it yet, you can do so with
+
+```sh
+rustup target add thumbv6m-none-eabi
+```
+
+After that, you can use `cargo build` to build the development version of the crate.
+
+If you have not done this yet, it is recommended to read some of the excellent resources
+available to learn Rust:
+
+- [Rust Embedded Book](https://docs.rust-embedded.org/book/)
+- [Rust Discovery Book](https://docs.rust-embedded.org/discovery/)
+
+## Examples
+
+Some examples, which are not specific to a particular board were provided as well.
+You can build the timer example with
+
+```sh
+cargo build --example timer-ticks
+```
+
+## Setting up your own binary crate
+
+If you have a custom board, you might be interested in setting up a new binary crate for your
+project. These steps aim to provide a complete list to get a binary crate working to flash
+your custom board.
+
+The hello world of embedded development is usually to blinky a LED. This example
+is contained within the
+[examples folder](https://egit.irs.uni-stuttgart.de/rust/va108xx-hal/src/branch/main/examples/blinky.rs).
+
+1. Set up your Rust cross-compiler if you have not done so yet. See more in the [build chapter](#Building)
+2. Create a new binary crate with `cargo init`
+3. To ensure that `cargo build` cross-compiles, it is recommended to create a `.cargo/config.toml`
+   file. A sample `.cargo/config.toml` file is provided in this repository as well
+4. Copy the `memory.x` file into your project. This file contains information required by the linker.
+5. Copy the `blinky.rs` file to the `src/main.rs` file in your binary crate
+6. You need to add some dependencies to your `Cargo.toml` file
+
+   ```toml
+	[dependencies]
+	cortex-m = "<Compatible Version>"
+	cortex-m-rt = "<Compatible Version>"
+	panic-halt = "<Compatible Version>"
+	embedded-hal = "<Compatible Version>"
+
+	[dependencies.va108xx-hal]
+	version = "<Most Recent Version>"
+	features = ["rt"]
+   ```
+
+6. Build the application with `cargo build`
+
+7. Flashing the board might work differently for different boards and there is usually
+   more than one way. You can find example instructions for the REB1 development board
+   [here](https://egit.irs.uni-stuttgart.de/rust/vorago-reb1).