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#ifndef _MSG_H_

#define _MSG_H_

#include <stdint.h>

#define SYNC_BYTE  0x55

#define CMD_NOP     0x00

#define CMD_CALC    0x10

#pragma pack( push, 1 )

typedef union _MSG_ {

  struct _fields_ {

    uint8_t  sync;

    uint8_t  header;

    uint8_t  mode;

    int32_t payload[ 3 ];

    uint8_t  crc;

  }fields;

  uint8_t bytes[ sizeof( struct _fields_ ) ];

}Msg;

#pragma pack( pop )

#endif