Merge pull request #85 from thalesfragoso/hclk-fix

Fixes hclk miscalculation

Author: therealprof

CHANGELOG.md

@@ -24,6 +24,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
+- Fix hclk miscalculation
+
 ## [v0.3.0] - 2019-04-27
 
 ### Added

src/rcc.rs

@@ -204,7 +204,11 @@ impl CFGR {
             })
             .unwrap_or(0b0111);
 
-        let hclk = sysclk / (1 << (hpre_bits - 0b0111));
+        let hclk = if hpre_bits >= 0b1100 {
+            sysclk / (1 << (hpre_bits - 0b0110))
+        } else {
+            sysclk / (1 << (hpre_bits - 0b0111))
+        };
 
         assert!(hclk <= 72_000_000);