application: move wait_space to global

global.h

@@ -415,6 +415,12 @@ void sleep_us(uint32_t duration);
  */
 void sleep_ms(uint32_t duration);
 
+/** wait for user to press space
+ *  @note needs to be implemented by the main application depending on the user inputs
+ *  @return if the user press space (true) or something else
+ */
+bool wait_space(void);
+
 /** setup board peripherals */
 void board_setup(void);