Macro nros_platform_export_timer 

macro_rules! nros_platform_export_timer {
    ($ty:ty) => { ... };
}

Emit every nros_platform_timer_* symbol declared in <nros/platform_timer.h> by delegating to the corresponding PlatformTimer trait method on $ty.

Constraint: the implementor’s TimerHandle associated type must be *mut core::ffi::c_void so the macro can pass the handle through the C ABI unchanged. Implementations using kernel-specific handle types should wrap them in a *mut c_void (typically by Box::into_raw + a thin newtype) before exporting.