Example using the user button on DISCO L475E IOT01, using interrupts

Dependencies:   mbed

Revision:
0:fc82b2d5fe07
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Nov 08 17:09:25 2018 +0000
@@ -0,0 +1,17 @@
+#include "mbed.h"
+
+InterruptIn button(USER_BUTTON);
+DigitalOut led(LED1);
+DigitalOut heartbeat(LED2);
+
+void toggle() {
+    led = !led;
+}
+
+int main() {
+    button.rise(&toggle);  // Call toggle function on the rising edge
+    while(1) {             // Wait around, interrupts will interrupt this!
+        heartbeat = !heartbeat;
+        wait(0.25);
+    }
+}