try

Dependencies:   mbed

Revision:
0:4f516fac21d6
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Sep 11 13:02:39 2018 +0000
@@ -0,0 +1,15 @@
+#include "mbed.h"
+
+DigitalIn button(PTC6);
+DigitalOut gpo(D0);
+DigitalOut led(LED_BLUE);
+
+
+int main()
+{
+    while (true) {
+        if (!button)
+        led = !led; // toggle led
+        wait(0.3f);
+    }
+}
\ No newline at end of file