common: Implement clock::enable_osc0().

diff --git a/src/common/clock.rs b/src/common/clock.rs
index 659e572d3fe26d7baaa3547e5c7ac9b00a2e1719..1189fdd58a45ac49f9de05d39f5ae9c8fc11b4ec 100644 (file)
--- a/src/common/clock.rs
+++ b/src/common/clock.rs
@@ -75,6 +75,10 @@ const MCG_S_CLKST_MASK: u8 = 3 << MCG_S_CLKST_SHIFT;
 const MCG_S_IREFST: u8 = 1 << 4;
 const MCG_S_LOCK0: u8 = 1 << 6;
 
+const OSC0_CR: u32 = 0x40065000;
+
+const OSC_CR_ERCLKEN: u8 = 1 << 7;
+
 fn configure_clkdiv() {
     let mut clkdiv1 = Reg32::new(SIM_CLKDIV1);
 
@@ -169,6 +173,10 @@ pub unsafe fn reset() {
     switch_to_fbe();
 }
 
+pub unsafe fn enable_osc0() {
+    Reg8::new(OSC0_CR).write(OSC_CR_ERCLKEN);
+}
+
 pub unsafe fn configure_usb() {
     let mut scgc4 = Reg32::new(SIM_SCGC4);
     scgc4.modify(|v| v & !SIM_SCGC4_USBOTG);