examples/nrf52840_blinky/src/lib.rs


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#![no_main]
#![no_std]

use cortex_m_semihosting::debug;

use defmt_rtt as _; // global logger

pub use nrf52840_hal as hal; // memory layout

use panic_probe as _;

// same panicking *behavior* as `panic-probe` but doesn't print a panic message
// this prevents the panic message being printed *twice* when `defmt::panic` is invoked
#[defmt::panic_handler]
fn panic() -> ! {
    cortex_m::asm::udf()
}

/// Terminates the application and makes a semihosting-capable debug tool exit
/// with status code 0.
pub fn exit() -> ! {
    loop {
        debug::exit(debug::EXIT_SUCCESS);
    }
}

/// Hardfault handler.
///
/// Terminates the application and makes a semihosting-capable debug tool exit
/// with an error. This seems better than the default, which is to spin in a
/// loop.
#[cortex_m_rt::exception]
unsafe fn HardFault(_frame: &cortex_m_rt::ExceptionFrame) -> ! {
    loop {
        debug::exit(debug::EXIT_FAILURE);
    }
}