Add RegisterBlock trait

Author: burrbull

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Added
+
+- RegisterBlock trait (like `Deref`, but don't require `self` instance,
+  only for fixed in memory peripherals)
+
 ### Fixed
 
 - Keyword sanitizing (`async`)

src/generate/generic.rs

@@ -1,5 +1,14 @@
 use core::marker;
 
+///This trait allows to get raw pointer on derived peripheral
+///as block of registers of base peripheral (like unsafe `Deref`)
+pub trait RegisterBlock {
+    ///Type of RegisterBlock of base peripheral
+    type RB;
+    ///Take peripheral address as raw pointer
+    fn rb() -> *const Self::RB;
+}
+
 ///This trait shows that register has `read` method
 ///
 ///Registers marked with `Writable` can be also `modify`'ed

src/generate/peripheral.rs

@@ -76,6 +76,14 @@ pub fn render(
                 unsafe { &*#name_pc::ptr() }
             }
         }
+        impl crate::RegisterBlock for #name_pc {
+            type RB = #base::RegisterBlock;
+
+            #[inline(always)]
+            fn rb() -> *const Self::RB {
+                #name_pc::ptr()
+            }
+        }
     });
 
     // Derived peripherals may not require re-implementation, and will instead