Move shift-constant 24 to BIT_TRACENA

Author: kellerkindt

src/peripheral/dcb.rs

@@ -4,6 +4,8 @@ use volatile_register::{RW, WO};
 
 use peripheral::DCB;
 
+const BIT_TRACENA: u8 = 24;
+
 /// Register block
 #[repr(C)]
 pub struct RegisterBlock {
@@ -24,12 +26,12 @@ impl DCB {
     /// soft-reset, only on power reset.
     pub fn enable_trace(&mut self) {
         // set bit 24 / TRACENA
-        unsafe { self.demcr.modify(|w| w | (0x01 << 24)); }
+        unsafe { self.demcr.modify(|w| w | (0x01 << BIT_TRACENA)); }
     }
 
     /// Disables TRACE. See `DCB::enable_trace()` for more details
     pub fn disable_trace(&mut self) {
         // unset bit 24 / TRACENA
-        unsafe { self.demcr.modify(|w| w & !(0x01 << 24)); }
+        unsafe { self.demcr.modify(|w| w & !(0x01 << BIT_TRACENA)); }
     }
 }