Why We Switched to Rust for Embedded

The C++ Conundrum

For decades, C and C++ have ruled the embedded world. They offer control, but at a cost: memory safety vulnerabilities. Buffer overflows, dangling pointers, and race conditions are the bane of embedded developers.

Enter Rust

Rust promises the performance of C++ with the memory safety of a high-level language, all without a garbage collector. This is achieved through its ownership model and borrow checker, which enforce rules at compile time.

Zero-Cost Abstractions

In embedded systems, resources are scarce. Rust's zero-cost abstractions mean that high-level programming concepts map down to optimized machine code. We can write expressive, safe code without paying a runtime penalty.

// Safe hardware access using PAC (Peripheral Access Crate)
let dp = pac::Peripherals::take().unwrap();
let mut rcc = dp.RCC.constrain();
let mut gpioa = dp.GPIOA.split(&mut rcc.ahb);

// Configuring a pin - type safe and checked at compile time
let led = gpioa.pa5.into_push_pull_output(&mut gpioa.moder, &mut gpioa.otyper);
            

Impact on Reliability

Since switching to Rust for our industrial controllers, we have seen a 90% reduction in firmware-related crashes. The compiler simply refuses to accept code that could lead to memory corruption, catching bugs before they ever reach the device.