Example using the user button on DISCO L475E IOT01, using busy waits

Dependencies:   mbed

Revision:
0:e7c102a4c673
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Nov 08 16:59:47 2018 +0000
@@ -0,0 +1,15 @@
+#include "mbed.h"
+
+DigitalIn button(USER_BUTTON); // Change to match your board
+DigitalOut led(LED1);
+
+#define BUTTON_PRESS 0
+
+int main() {
+    while(1) {
+        if(BUTTON_PRESS == button){
+           led = !led;
+           wait(1);
+       }
+    }
+}