humpback-dds/examples/util/logger.rs

// Enables ITM
pub unsafe fn enable_itm(
    dbgmcu: &stm32h7xx_hal::stm32::DBGMCU,
    dcb: &mut cortex_m::peripheral::DCB,
    itm: &mut cortex_m::peripheral::ITM
) {
    // ARMv7-M DEMCR: Set TRCENA. Enables DWT and ITM units
    //unsafe { *(0xE000_EDFC as *mut u32) |= 1 << 24 };
    dcb.enable_trace();

    // Ensure debug blocks are clocked before interacting with them
    dbgmcu.cr.modify(|_, w| {
        w.d1dbgcken()
            .set_bit()
            .d3dbgcken()
            .set_bit()
            .traceclken()
            .set_bit()
            .dbgsleep_d1()
            .set_bit()
    });

    // SWO: Unlock
    *(0x5c00_3fb0 as *mut u32) = 0xC5ACCE55;
    // SWTF: Unlock
    *(0x5c00_4fb0 as *mut u32) = 0xC5ACCE55;

    // SWO CODR Register: Set SWO speed
    *(0x5c00_3010 as *mut _) = 199;

    // SWO SPPR Register:
    // 1 = Manchester
    // 2 = NRZ
    *(0x5c00_30f0 as *mut _) = 2;

    // SWTF Trace Funnel: Enable for CM7
    *(0x5c00_4000 as *mut u32) |= 1;

    // ITM: Unlock
    itm.lar.write(0xC5ACCE55);
    // ITM Trace Enable Register: Enable lower 8 stimulus ports
    itm.ter[0].write(1);
    // ITM Trace Control Register: Enable ITM
    itm.tcr.write(
        (0b000001 << 16) | // TraceBusID
        (1 << 3) | // enable SWO output
        (1 << 0), // enable the ITM
    );
}

// use panic_itm as _;

use lazy_static::lazy_static;
use log::LevelFilter;

pub use cortex_m_log::log::Logger;

use cortex_m_log::{
    destination::Itm as ItmDest,
    printer::itm::InterruptSync,
    modes::InterruptFree,
    printer::itm::ItmSync
};

lazy_static! {
    static ref LOGGER: Logger<ItmSync<InterruptFree>> = Logger {
        level: LevelFilter::Trace,
        inner: unsafe {
            InterruptSync::new(
                ItmDest::new(cortex_m::Peripherals::steal().ITM)
            )
        },
    };
}

pub fn init() {
    cortex_m_log::log::init(&LOGGER).unwrap();
}

// use panic_semihosting as _;

use cortex_m_log::printer::semihosting;
use cortex_m_log::printer::semihosting::Semihosting;
use cortex_m_log::modes::InterruptOk;
use cortex_m_semihosting::hio::HStdout;

lazy_static! {
    static ref HLOGGER: Logger<Semihosting<InterruptOk, HStdout>> = Logger {
        level: LevelFilter::Trace,
        inner: semihosting::InterruptOk::<_>::stdout().expect("Get Semihosting stdout"),
    };
}

pub fn semihosting_init() {
    cortex_m_log::log::init(&HLOGGER).unwrap();
}