I little test which wakes up from deepsleep via user buttom click and turns on the LED.

Dependencies:   mbed

Revision:
0:3208dcf3974f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 22 13:05:35 2016 +0000
@@ -0,0 +1,31 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+InterruptIn event(USER_BUTTON);
+
+Serial ser(USBTX, USBRX);
+
+bool pressed = false;
+
+void KeyPressed()
+{
+    ser.printf("Key Pressed\r\n");
+    pressed = true;
+}
+
+int main() {
+    ser.baud(230400);
+    ser.printf("Hello, World\r\n");
+    event.fall(&KeyPressed);
+
+    while(1) {
+        myled = 1;
+        wait(0.2);
+        myled = 0;
+        wait(1.0);
+        if (pressed) {
+            deepsleep();
+            pressed = false;
+        }
+    }
+}