NTOUEE mbed sample code : blinky LED1 & printf

Revision:
0:548933a73419
diff -r 000000000000 -r 548933a73419 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 18 07:14:20 2016 +0000
@@ -0,0 +1,11 @@
+#include "mbed.h"
+
+DigitalOut led1(LED1);
+
+int main() {
+    while (true) {
+        led1 = !led1;
+        Thread::wait(500);
+        printf("LED1=%d\n\r", led1); // please set UART baud rate = 9600
+    }
+}