kirdy-firmware/src/device/log_setup.rs

#[cfg(not(any(feature = "semihosting", feature = "RTT")))]
pub fn init_log() {
    use super::usb;
    static USB_LOGGER: usb::Logger = usb::Logger;
    let _ = log::set_logger(&USB_LOGGER);
    // log::set_max_level(log::LevelFilter::Debug);
    log::set_max_level(log::LevelFilter::Trace);
}

#[cfg(feature = "RTT")]
pub fn init_log() {
    use rtt_target::rtt_init_print;

    use super::rtt_logger;
    static RTT_LOGGER: rtt_logger::Logger = rtt_logger::Logger;
    rtt_init_print!();
    let _ = log::set_logger(&RTT_LOGGER);
    log::set_max_level(log::LevelFilter::Debug);
}

#[cfg(feature = "semihosting")]
pub fn init_log() {
    use cortex_m_log::{log::{init, Logger},
                       printer::semihosting::{hio::HStdout, InterruptOk}};
    use log::LevelFilter;
    static mut LOGGER: Option<Logger<InterruptOk<HStdout>>> = None;
    let logger = Logger {
        inner: InterruptOk::<_>::stdout().expect("semihosting stdout"),
        level: LevelFilter::Info,
    };
    let logger = unsafe { LOGGER.get_or_insert(logger) };

    init(logger).expect("set logger");
}