Fix MonoTimer and Timer::syst frequency

CHANGELOG.md

@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fix wrong frequency reported by `MonoTimer`
+- Fix wrong timings generated by `Timer::syst` 
 - Fix period retrieval for timers
 
 ### Changed

src/time.rs

@@ -241,7 +241,7 @@ impl MonoTimer {
         drop(dwt);
 
         MonoTimer {
-            frequency: clocks.sysclk(),
+            frequency: clocks.hclk(),
         }
     }
 

src/timer.rs

@@ -163,7 +163,7 @@ impl Timer<SYST> {
         syst.set_clock_source(SystClkSource::Core);
         Self {
             tim: syst,
-            clk: clocks.sysclk(),
+            clk: clocks.hclk(),
         }
     }