console.out

16:23:55.925 INFO - about to panic

logger.rs

#![no_std]

use log::{
    Metadata,
    Record
};

use rtt_target::rprintln;

pub struct RTTLogger;

impl log::Log for RTTLogger {
    fn enabled(&self, _metadata: &Metadata) -> bool {
        true
    }

    fn log(&self, record: &Record) {
        if self.enabled(record.metadata()) {
            rprintln!("{} - {}", record.level(), record.args());
        }
    }

    fn flush(&self) {
    }
}

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}

main.rs

        info!("about to panic");
        panic!("well dang");