hod3 working, now to hod4

hod4_uart/main.cpp

@@ -0,0 +1,44 @@
+// main.cpp
+#include "mbed.h"
+
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalIn  button(PC_13);
+
+int another_press(int press_num) {
+    press_num += 1;
+    if (press_num >= 8) {
+        press_num = 0;
+    };
+
+    return press_num;
+}
+
+void set_led(int number) {
+    led1 = (number & 1) ? 1 : 0;
+    led2 = (number & 2) ? 1 : 0;
+    led3 = (number & 4) ? 1 : 0;
+}
+
+int main()
+{
+
+    int num_presses = 0;
+    while (true) {
+        led1 = 0;
+        led2 = 0;
+        led3 = 0;
+
+        if (button == 0) {
+          num_presses = another_press(num_presses);
+          set_led(num_presses);
+
+          while (button == 0) {
+            ThisThread::sleep_for(10ms);
+          }
+        }
+
+        ThisThread::sleep_for(150ms);
+    }
+}