Merge #447

447: Add implementation for critical-section 1.0 r=adamgreig a=Dirbaio

Picking up #433 since it seems stalled. Changes from #433 are:
- Update to `critical-section 1.0.0-alpha.2`
- Use `bool` restore token
- Name Cargo feature `critical-section-single-core`.

TODO before merging:

- [x] Wait for `critical-section 1.0` release https://github.com/rust-embedded/critical-section/pull/19

Co-Authored-By: Markus Reiter `@reitermarkus` 

Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/lib.rs b/src/lib.rs
index e430dd8..97fd97a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -43,15 +43,16 @@
 // Don't warn about feature(asm) being stable on Rust >= 1.59.0
 #![allow(stable_features)]
 
-extern crate bare_metal;
-extern crate volatile_register;
-
 #[macro_use]
 mod macros;
 
 pub mod asm;
 #[cfg(armv8m)]
 pub mod cmse;
+// This is only public so the `singleton` macro does not require depending on
+// the `critical-section` crate separately.
+#[doc(hidden)]
+pub mod critical_section;
 pub mod delay;
 pub mod interrupt;
 #[cfg(all(not(armv6m), not(armv8m_base)))]