1 files changed, 9 insertions, 0 deletions
diff --git a/02-usart/src/delay.c b/02-usart/src/delay.c
new file mode 100644
index 0000000..2a16d47
--- /dev/null
+++ b/02-usart/src/delay.c
@@ -0,0 +1,9 @@
+#include "delay.h"
+
+void delay(uint32_t delay)
+{
+  while (delay--) {
+    /* needed to keep the compiler from optimizing away the loop. */
+    asm volatile("");
+  }
+}