#![no_std]

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() -> ! {
    unsafe {
        // turn off the USB D+ pull-up before pausing the device with a breakpoint
        // this disconnects the nRF device from the USB host so the USB host won't attempt further
        // USB communication (and see an unresponsive device). probe-run will also reset the nRF's
        // USBD peripheral when it sees the device in a halted state which has the same effect as
        // this line but that can take a while and the USB host may issue a power cycle of the USB
        // port / hub / root in the meantime, which can bring down the probe and break probe-run
        const USBD_USBPULLUP: *mut u32 = 0x4002_7504 as *mut u32;
        USBD_USBPULLUP.write_volatile(0)
    }
    cortex_m::asm::udf()
}