Add free() function to rtc

Author: Sh3Rm4n

CHANGELOG.md

@@ -49,6 +49,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   This should make it easier to generically use the `Serial` peripheral. ([#253])
 - Greatly increase coverage of `Debug` and `defmt::Format` implementations.
   Almost all important types should now be supported. ([#265])
+- Add a `free()` function to the RTC implementation to retrieve the passed-in
+  peripheral. ([#266])
 
 [`enumset`]: https://crates.io/crates/enumset
 

src/rtc.rs

@@ -84,6 +84,11 @@ impl Rtc {
         self.regs.cr.read().fmt().bit()
     }
 
+    /// Release the RTC peripheral
+    pub fn free(self) -> RTC {
+        self.regs
+    }
+
     /// As described in Section 27.3.7 in RM0316,
     /// this function is used to disable write protection
     /// when modifying an RTC register