text: // IO.h
  #include <stdint.h>
  
  void PortF_Init();
  
  static void SysTick_Wait(uint32_t delay);
  
  void SysTick_Wait10ms(uint32_t delay);
  
  void SysTick_Init();
  
  void IO_Init();
  
  void IO_Touch();
  
  void IO_Touch_Pause();
  