kirdy-firmware/src/device/log_setup.rs

#[cfg(not(feature = "semihosting"))]
use super::usb;

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

#[cfg(feature = "semihosting")]
pub fn init_log() {
    use cortex_m_log::log::{init, Logger};
    use cortex_m_log::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");
}