main.rs

//! main.rs

#![deny(unsafe_code)]
#![deny(warnings)]
#![no_main]
#![no_std]

use panic_halt as _;
//use panic_rtt_target as _;
use rtt_target::{rprintln, rtt_init_print};
use stm32f4;

#[rtic::app(device = stm32f4)]
const APP: () = {
    #[init]
    fn init(_cx: init::Context) {
        rtt_init_print!();
        rprintln!("init");
    }

    #[idle]
    fn idle(_cx: idle::Context) -> ! {
        rprintln!("idle");
        panic!("panic");
//        loop {
//            continue;
//        }
    }
};

// A) A Simple Trace
// > cargo run
// cargo run
//    Compiling app v0.1.0 (/home/pln/courses/d7020e/rtic_f4xx_nucleo)
//     Finished dev [unoptimized + debuginfo] target(s) in 0.18s
//      Running `probe-run --chip STM32F411RETx target/thumbv7em-none-eabi/debug/app`
//   (HOST) INFO  flashing program (15.06 KiB)
//   (HOST) INFO  success!
// ────────────────────────────────────────────────────────────────────────────────
// init
// idle
//
// B) Breaking
// Now press Ctrl-C
// ^Cstack backtrace:
//    0: app::idle
//         at src/main.rs:25
//    1: main
//         at src/main.rs:13
//    2: Reset
//         at /home/pln/.cargo/registry/src/github.com-1ecc6299db9ec823/cortex-m-rt-0.6.13/src/lib.rs:526
//
// Make sure you got the expected output
// Awnser: Yes, got the expected output.
//
// C) Panic tracing
// Rust is designed for reliability, with the aim to deliver memory safety
// and defined behavior at all times.
// Recoverable errors (in libraries and user code) should use the `Result<T,E>` type,
// while unrecoverable errors should `panic`.
//
// Let's introduce a `panic` (uncomment line 24).
// > cargo run
//
// What is the output?
//
// [Your answer here]
// Compiling app v0.1.0 (/home/niklas/Desktop/D7020E/rtic_f4xx_nucleo)
// error: unreachable expression
//   --> src/main.rs:25:9