Slides (in German) from my Building IoT Talk "IoT mit Rust programmieren" which (tries) to answer the question: Can Rust be a solution for embedded IoT devices (instead of C/C++), which are: connected to the internet developed in a short time storing personal data secure more intelligence inexpensive

1. IoT mit Rust
programmieren
Lars Gregori
Hybris Labs

2. Motivation
http://fpiot.metasepi.org/ (Functional IoT)
Imagine IoT devices are:
• connected to the internet
• developed in a short time
• storing personal data
• secure
• more intelligence
• inexpensive
C language can design the IoT devices such like that? No, can't.

3. Agenda
• Rust
• Überblick
• Control & Safety
• Code Beispiele
• Rust
• Embedded Rust
• Cross Compiling
• MCU Demo
• Debugging Rust

4. Rust
Überblick

5. rust-lang.org

6. Rust FAQ
https://www.rust-lang.org/faq.html
• safe, concurrent, practical systems language
• “We do not intend to be
100% static, 100% safe, 100% reflective,
or too dogmatic in any other sense.”
• Mozilla Servo

7. Rust FAQ
https://www.rust-lang.org/faq.html
• multi-paradigm
• OO
• no garbage collection
• strong influences from the world of functional programming
• built on LLVM

8. Rust FAQ
https://www.rust-lang.org/faq.html
• Cross-Platform
• Android, iOS, …
• Conditional compilation
#[cfg(target_os = "macos")]

9. Rust
Control & Safety

10. Control & Safety
C/C++
Safety
Control
Haskell
Go
Java
Rust
Python

11. Rust concepts
• ownership, the key concept
• borrowing, and their associated feature ‘references’
• lifetimes, an advanced concept of borrowing
“work with the rules of the ownership system for a period of time,
[..] fight the borrow checker less and less"

12. Agenda
• Rust
• Überblick
• Control & Safety
• Code Beispiele
• Rust
• Embedded Rust
• Cross Compiling
• MCU Demo
• Debugging Rust

13. Code Beispiele
Rust

14. Source Code
fn main() {
println!("Hello, world!");
}

15. Source Code
fn main() {
let world = "world!";
println!("Hello, {}", world);
}

16. Code Beispiele
Embedded Rust

17. Embedded Code-Beispiele
zinc.rs
Zinc is an experimental attempt to write an ARM stack that would be
similar to CMSIS or mbed in capabilities but would show rust’s best safety
features applied to embedded development.
Zinc is mostly assembly-free and completely C-free at the moment.

18. ▶︎Embedded Rust

19. Agenda
• Rust
• Überblick
• Control & Safety
• Code Beispiele
• Rust
• Embedded Rust
• Cross Compiling
• MCU Demo
• Debugging Rust

20. Cross-Compiling

21. Multirust
https://github.com/brson/multirust
• Manage multiple installations of the official Rust binaries.
• Configure Rust toolchains per-directory.
• Install and update from Rust release channels: nightly, beta, and stable.
• …

22. target
rustc:
rustc --target=thumbv7em-none-eabi …
cargo:
.cargo/config
cargo build --target=thumbv7em-none-eabi …
https://github.com/japaric/rust-cross

23. ▶︎Cross-Compiling

24. Agenda
• Rust
• Überblick
• Control & Safety
• Code Beispiele
• Rust
• Embedded Rust
• Cross Compiling
• MCU Demo
• Debugging Rust

25. MCU Demo
Debugging Rust

26. Debugging Rust
openocd … -c gdb_port 3333
arm-none-eabi-gdb
(gdb) target remote :3333
(gdb) file …
(gdb) break main
(gdb) next
…

27. ▶︎MCU Demo

28. Agenda
• Rust
• Überblick
• Control & Safety
• Code Beispiele
• Rust
• Embedded Rust
• Cross Compiling
• MCU Demo
• Debugging Rust

29. Thank you!