[STM32] Blink the led in the example

Author: mean

example/stm32/hello.ino

@@ -1,12 +1,16 @@
 #include "Arduino.h"
-
+#define LED PC13
 void setup()
 {
     Serial.println("Hi there");
+    pinMode(LED,OUTPUT);
 
 }
 void loop()
 {
     Serial.print("Hey!\n");
+    digitalWrite(LED,HIGH);
+    delay(500);
+    digitalWrite(LED,LOW);
     delay(500);
 }