| commit | 64c909b9e53d7a883b313d65961086b9c026f9eb | [log] [tgz] |
|---|---|---|
| author | Cliff L. Biffle <cliff@oxide.computer> | Wed Feb 12 15:58:32 2020 -0800 |
| committer | Cliff L. Biffle <cliff@oxide.computer> | Wed Feb 12 16:00:21 2020 -0800 |
| tree | 99a3c9eb256b6b1c9ef238855bbf676b64564446 | |
| parent | b4b12664d8ccf5c4fa7be9410d7a76a0b264082f [diff] |
Change RISC-V register names in clobbers. As of right now, asm clobbers of specific registers in Rust only work with the registers' x-style names, not the a/t/ra names. Fixes #139. See rust-lang/rust#60392.
Rust userland library for Tock (WIP)
Tested with tock Release 1.4.1.
The library works in principle on most boards, but there is currently the showstopper bug #28 that prevents the generation of relocatable code. This means that all applications must be installed at the flash address they are compiled with, which usually means that they must be compiled especially for your board and that there can only be one application written in rust at a time and it must be installed as the first application on the board, unless you want to play games with linker scripts. There are some *_layout.ld files provided that allow to run the examples on common boards. Due to MPU region alignment issues they may not work for applications that use a lot of RAM, in that case you may have to change the SRAM start address to fit your application.
This project is nascent and still under heavy development, but first steps:
Ensure you have rustup installed.
Clone the repository.
git clone https://github.com/tock/libtock-rs cd libtock-rs
Install elf2tab.
cargo install -f elf2tab --version 0.4.0
Add dependencies for cross-compilation.
rustup target add thumbv7em-none-eabi
Use the run_example script to compile and run the example app you want to use:
./run_example.sh blink
Due to bug #28 this will currently only work if you are using the nRF52-DK platform.
If you have a nRF52840-DK you must change link-arg=-Tnrf52_layout.ld in .cargo/config to link-arg=-Tnrf52840_layout.ld
If you have a hail board you can flash your device as follows:
hail to 1link-arg=-Tnrf52_layout.ld in .cargo/config to link-arg=-Thail_layout.ldrun_example.sh as above.For other platforms, you may have to create your own memory layout definition.
The easiest way to start using libtock-rs is adding an example to the examples folder. The boiler plate code you would write is
#![no_std] use libtock::result::TockResult; #[libtock::main] async fn main() -> TockResult<()> { // Your code }
If you want to use heap based allocation you will have to add
extern crate alloc;
to the preamble.
To run on the code on your board you can use
./run_example.sh <your app>
This script does the following steps for you:
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