common: Implement clock::reset().

This puts the MCG back into FBE mode.

diff --git a/src/common/clock.rs b/src/common/clock.rs
index 3d46016cb0558c86c45dc8483da96eb8ac932f17..659e572d3fe26d7baaa3547e5c7ac9b00a2e1719 100644 (file)
--- a/src/common/clock.rs
+++ b/src/common/clock.rs
@@ -164,6 +164,11 @@ pub unsafe fn configure() {
     });
 }
 
+pub unsafe fn reset() {
+    switch_to_pbe();
+    switch_to_fbe();
+}
+
 pub unsafe fn configure_usb() {
     let mut scgc4 = Reg32::new(SIM_SCGC4);
     scgc4.modify(|v| v & !SIM_SCGC4_USBOTG);