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35 lines
1.8 KiB
Markdown
35 lines
1.8 KiB
Markdown
# RTIC hello
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RTIC, Real-Time Interrupt-driven Concurrency, is a framework for building evented, time sensitive applications.
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✅ Open the `src/bin/rtic-hello.rs` file.
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RTIC applications are written in RTIC's Domain Specific Language (DSL). The DSL extends Rust syntax with custom attributes like `#[init]` and `#[idle]`.
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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.
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`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.
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✅ Build the `rtic-hello` example and look at the generated `rtic-expansion.rs` file.
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You can use `rustfmt` on `target/rtic-expansion.rs` to make the generated code easier to read. Among other things, the file should contain the following lines. Note that interrupts are disabled during the execution of the `init` function:
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```rust
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unsafe extern "C" fn main() -> ! {
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rtic::export::interrupt::disable();
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let mut core: rtic::export::Peripherals = rtic::export::Peripherals::steal().into();
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#[inline(never)]
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fn __rtic_init_resources<F>(f: F)
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where
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F: FnOnce(),
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{
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f();
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}
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__rtic_init_resources(|| {
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let (shared_resources, local_resources, mut monotonics) =
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init(init::Context::new(core.into()));
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rtic::export::interrupt::enable();
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});
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idle(idle::Context::new(&rtic::export::Priority::new(0)))
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}
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``` |