stm32: disable HSI if not used

1 files changed, 5 insertions, 0 deletions

diff --git a/embassy-stm32/src/rcc/l.rs b/embassy-stm32/src/rcc/l.rs
index 0d668103c..a1dfefd15 100644
--- a/embassy-stm32/src/rcc/l.rs
+++ b/embassy-stm32/src/rcc/l.rs
@@ -385,6 +385,11 @@ pub(crate) unsafe fn init(config: Config) {
         while !RCC.extcfgr().read().c2hpref() {}
     }
 
+    // Disable HSI if not used
+    if !config.hsi {
+        RCC.cr().modify(|w| w.set_hsion(false));
+    }
+
     config.mux.init();
 
     set_clocks!(