datatype.h

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#ifndef DATATYPE
#define DATATYPE
typedef unsigned char       INT8U;  /*  8 bits */
typedef unsigned short int  INT16U; /* 16 bits */
typedef unsigned long int   INT32U; /* 32 bits */

typedef signed char         INT8S;   /*  8 bits */
typedef signed short int    INT16S;  /* 16 bits */
typedef signed long int     INT32S;  /* 32 bits */

typedef volatile INT8U      INT8VU;  /*  8 bits */
typedef volatile INT16U     INT16VU; /* 16 bits */
typedef volatile INT32U     INT32VU; /* 32 bits */
#endif