text: #ifndef __CONFIG_SMALL_MODBUS_H__
  #define __CONFIG_SMALL_MODBUS_H__
  
  /*
  *RTTHREAD PORT
  */
  #define SMALL_MODBUS_RTTHREAD 1
  #define SMALL_MODBUS_RTTHREAD_USE_DEVICDE  1
  #define SMALL_MODBUS_RTTHREAD_USE_SOCKET   0
  
  #if SMALL_MODBUS_RTTHREAD
  #include "small_modbus_port_rtthread.h"
  #endif
  
  /*
  *LINUX PORT
  */
  #define SMALL_MODBUS_LINUX 0
  #if SMALL_MODBUS_LINUX
  #include "small_modbus_port_linux.h"
  #endif
  
  /*
  *WIN32 PORT  
  */
  #define SMALL_MODBUS_WIN32 0
  #if SMALL_MODBUS_WIN32
  #include "small_modbus_port_win32.h"
  #endif
  
  #define SMALL_MODBUS_CRC_BYTE_SWAP 0
  
  #endif /* __CONFIG_SMALL_MODBUS_H__ */
  