va416xx-rs/README.md

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Vorago VA416xx Rust Support
=========

This crate collection provides support to write Rust applications for the VA416XX family
of devices.

## List of crates

This workspace contains the following crates:

- The [`va416xx`](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/va416xx)
  PAC crate containing basic low-level register definition
- The [`va416xx-hal`](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/va416xx-hal)
  HAL crate containing higher-level abstractions on top of the PAC register crate.
- The [`vorago-peb1`](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/vorago-peb1)
  BSP crate containing support for the PEB1 development board.

It also contains the following helper crates:

- The [`bootloader`](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/bootloader)
  crate contains a sample bootloader strongly based on the one provided by Vorago.
- The [`flashloader`](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/flashloader)
  crate contains a sample flashloader which is able to update the redundant images in the NVM which
  is compatible to the provided bootloader as well.
- The [`examples`](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/examples)
  folder contains various example applications crates using the HAL and the PAC.
  This folder also contains dedicated example applications using the
  [`RTIC`](https://rtic.rs/2/book/en/) and [`embassy`](https://github.com/embassy-rs/embassy)
  native Rust RTOSes.

## Using the `.cargo/config.toml` file

Use the following command to have a starting `config.toml` file

```sh
cp .cargo/def-config.toml .cargo/config.toml
```

You then can adapt the `config.toml` to your needs. For example, you can configure runners
to conveniently flash with `cargo run`.

## Using the sample VS Code files

Use the following command to have a starting configuration for VS Code:

```sh
cp -rT vscode .vscode
```

You can then adapt the files in `.vscode` to your needs.

## Flashing, running and debugging the software

You can use CLI or VS Code for flashing, running and debugging. In any case, take
care of installing the pre-requisites first.

### Pre-Requisites

1. [SEGGER J-Link tools](https://www.segger.com/downloads/jlink/) installed
2. [gdb-multiarch](https://packages.debian.org/sid/gdb-multiarch) or similar
   cross-architecture debugger installed. All commands here assume `gdb-multiarch`.

### Using CLI

You can build the blinky example application with the following command

```sh
cargo build --example blinky
```

Start the GDB server first. The server needs to be started with a certain configuration and with
a JLink script to disable ROM protection.
For example, on Debian based system the following command can be used to do this (this command
is also run when running the `jlink-gdb.sh` script)

```sh
JLinkGDBServer -select USB -device Cortex-M4 -endian little -if SWD -speed 2000 \
  -LocalhostOnly -vd -jlinkscriptfile ./jlink/JLinkSettings.JLinkScript
```

After this, you can flash and debug the application with the following command

```sh
gdb-mutliarch -q -x jlink/jlink.gdb target/thumbv7em-none-eabihf/debug/examples/blinky
```

Please note that you can automate all steps except starting the GDB server by using a cargo
runner configuration, for example with the following lines in your `.cargo/config.toml` file:

```toml
[target.'cfg(all(target_arch = "arm", target_os = "none"))']
runner = "gdb-multiarch -q -x jlink/jlink.gdb"
```

After that, you can simply use `cargo run --example blinky` to flash the blinky
example.

### Using VS Code

Assuming a working debug connection to your VA416xx board, you can debug using VS Code with
the [`Cortex-Debug` plugin](https://marketplace.visualstudio.com/items?itemName=marus25.cortex-debug).
Please make sure that [`objdump-multiarch` and `nm-multiarch`](https://forums.raspberrypi.com/viewtopic.php?t=333146)
are installed as well.

Some sample configuration files for VS code were provided and can be used by running
`cp -rT vscode .vscode` like specified above. After that, you can use `Run and Debug`
to automatically rebuild and flash your application.

If you would like to use a custom GDB application, you can specify the gdb binary in the following
configuration variables in your `settings.json`:

- `"cortex-debug.gdbPath"`
- `"cortex-debug.gdbPath.linux"`
- `"cortex-debug.gdbPath.windows"`
- `"cortex-debug.gdbPath.osx"`

The provided VS Code configurations also provide an integrated RTT logger, which you can access
via the terminal at `RTT Ch:0 console`. In order for the RTT block address detection to
work properly, `objdump-multiarch` and `nm-multiarch` need to be installed.

### Using the RTT Viewer

The RTT viewer can be used to display log messages received from the target. The base address
for the RTT block placement is 0x1fff8000. It is recommended to use a search range of 0x1000 around
that base address when using the RTT viewer.