2 files changed, 33 insertions, 0 deletions
diff --git a/system-clock/include/delay.h b/system-clock/include/delay.h
new file mode 100644
index 0000000..65a26d6
--- /dev/null
+++ b/system-clock/include/delay.h
@@ -0,0 +1,12 @@
+#ifndef H__DELAY__
+#define H__DELAY__
+
+#include <stdint.h>
+
+/*
+ * Loops and count-downs the delay, the time this takes depends on the speed
+ * of the clock.
+ */
+void delay(uint32_t delay);
+
+#endif /* H__DELAY__ */
diff --git a/system-clock/include/isr_vector.h b/system-clock/include/isr_vector.h
new file mode 100644
index 0000000..eee1a51
--- /dev/null
+++ b/system-clock/include/isr_vector.h
@@ -0,0 +1,21 @@
+#ifndef h__ISR_VECTOR_H__
+#define h__ISR_VECTOR_H__
+
+/*
+ * Include file for interrupt service routines.
+ */
+
+/*
+ * The interrupt service routines. These link in the function `main` as the
+ * main function.
+ */
+extern const void* isr_vector[];
+
+
+/*
+ * Defines an error state. This loops forever and defines a distinct flashing
+ * pattern to let the user know an unhandled ISR happened.
+ */
+void unhandled_isr();
+
+#endif /* h___ISR_VECTOR_H__ */