Add main

Group21_Lab06_Task1/main.c

@@ -88,3 +88,12 @@ void GPIOF_interruptHandler(void)
     systick_setting();
 }
 
+int main(void)
+{
+    GPIO_PORT_F_init();                   // GPIO initialization function
+    systick_setting();                    // SysTick setup
+
+    while (1) {
+                                          // DO NOTHING
+    }
+}