diff --git a/inc/system.h b/inc/system.h
new file mode 100644
--- /dev/null
+++ b/inc/system.h
@@ -0,0 +1,9 @@
+#ifndef _SYSTEM_H
+#define _SYSTEM_H
+
+// Prototypes
+void sysclk_init(void);
+void enter_sleep(void);
+void enter_deepsleep(void);
+
+#endif