added a small skeleton of code

main.c

@@ -5,15 +5,67 @@
  * Author : dozed
  */ 
 
-#include <avr/io.h>
+#define button1 1234
+#define button2 5678
+#define button3 whatever
 
+typedef enum {CLOCK_INIT = 0, CLOCK_IDLE} clock_state_e;
+
+clock_state_e clock_state = CLOCK_INIT;
+clock_state_e clock_new_state = CLOCK_INIT;
+
+int counter = 0; //the counter variable that is being set by the interrupt
 
 int main(void)
 {
-    /* Replace with your application code */
+  //-----------INIT----------------
+  //SETUP PINS (needs to be done)
+
+  //attach interrupt (needs to be done)
+
+  //-----------END INIT------------
   while (1) 
   {
-		printf("test");
+    timer_state = timer_new_state;
+
+    switch(clock_state){
+      case CLOCK_INIT:
+        //do some init stuff...
+        lcd.init(); //I know, it's just c but I don't care
+
+        //INIT done -> change to IDLE
+        clock_new_state = CLOCK_IDLE;
+
+        break;
+
+      case CLOCK_IDLE:
+        //IDLE MODE
+
+        //print the IDLE Screen
+        lcd.goto(0,0);
+        lcd.print(counter /*do some  claculations*/);
+        lcd.goto(0,1);
+        lcd.print("<  current time  >");
+
+        //check buttons
+        if(button_pressed(1)){
+          //do something
+        }
+        else if(button_pressed(2){
+          //do something
+        }
+        else if(button_pressed(3)){
+          //do something
+        }
+    }
+    //do some other stuff (like checking if an alarm has been triggered) 
+
   }
 }
 
+bool button_pressed(int button_number)
+{
+  bool button_state = /*check the state of the button here*/;
+  return(button_state);
+}
+