RTIC hello

RTIC, Real-Time Interrupt-driven Concurrency, is a framework for building evented, time sensitive applications.

✅ Open the src/bin/rtic-hello.rs file.

RTIC applications are written in RTIC's Domain Specific Language (DSL). The DSL extends Rust syntax with custom attributes like #[init] and #[idle].

RTIC makes a clearer distinction between the application's initialization phase, the #[init] function, and the application's main loop or main logic, the #[idle] function. The initialization phase runs with interrupts disabled and interrupts are re-enabled before the idle function is executed.

rtic::app is a procedural macro that generates extra Rust code, in addition to the user's functions. The fully expanded version of the macro can be found in the file target/rtic-expansion.rs. This file will contain the expansion of the procedural macro for the last compiled RTIC application.

✅ Build the rtic-hello example and look at the generated rtic-expansion.rs file.

The generated code should look like this. Note that interrupts are disabled during the execution of the init function:

fn main() -> ! {
    rtic::export::interrupt::disable();
    let late = init(init::Context::new(/* .. */));
    rtic::export::interrupt::enable();
    idle(idle::Context::new(/* .. */))
}