text: #ifndef __MCU_INIT_H
  #define __MCU_INIT_H
  #ifdef __cplusplus
   extern "C" {
  #endif
  
  #include "stdlib.h"
  #include "string.h"
  #include "stdio.h"
  #include "main.h"
  #include "stm32f4xx_hal.h"
  #include "stm32f4xx_it.h"
  #include "usart.h"
  #include "gpio.h"
  #include "rng.h"
  #include "tos_k.h"
  
  void board_init(void);
  void SystemClock_Config(void);
  void Error_Handler(void);
  
  #ifdef __cplusplus
  }
  #endif
  #endif /*__ __MCU_INIT_H */
  