add NVIC::{mask,unmask} #150
Merged
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these are the "static method" (methods that don't take
self
) versions ofNVIC::{enable,disable} in the same vein as the existing NVIC::{pend,unpend}
this commit also deprecates the existing NVIC::{enable,disable} methods and
notes that NVIC::enable is unsound because it should be an
unsafe
method (likeinterrupt::enable and basepri::write, it can break critical sections) but it's
marked as safe. Its replacement, NVIC::unmask, has the correct unsafety setting:
it's an
unsafe
function.