1 files changed, 15 insertions, 0 deletions
diff --git a/02-usart/include/kern/spin.h b/02-usart/include/kern/spin.h
new file mode 100644
index 0000000..a23d25b
--- /dev/null
+++ b/02-usart/include/kern/spin.h
@@ -0,0 +1,15 @@
+#ifndef H__SPIN_
+#define H__SPIN_
+
+#include <stdint.h>
+
+/*
+ * Flash a code on the status LED.
+ *
+ * The flash codes a binary from MSB to LSB. A long flash is a 1, a short flash
+ * is a 0. Each independent flashing is succeced by a break of 4 times that
+ * of a long flash.
+ */
+void spin(uint32_t base_delay, uint8_t code);
+
+#endif /* H__SPIN_ */