text: #ifndef __OS_HAL_H__
  #define __OS_HAL_H__
  
  //#define USING_RTTHREAD
  
  #ifdef USING_RTTHREAD
  extern void rt_kprintf(const char *fmt, ...);
  extern void *rt_malloc(int size);
  #define os_printf rt_kprintf
  #define os_malloc rt_malloc
  #else
  #define os_printf printf
  #endif
  
  #endif
  