cksum.h

Hitech microchip PIC C18 Compiler

/**** These are typical settings and ****
 **** should be adjusted to suit those **
 **** used in the --CHECKSUM option. ****/
#define _OFFSET 0
#define _ALGORITHM 1     // can be -4,-3,-2,-1,1,2,3,4
#define _RESULT_WIDTH 2  // byte size of result
#define _START 0L
#define _END (_ROMSIZE - _RESULT_WIDTH - 1)
/*********************************/

/* The data type being returned is
 * determined from the above settings. */
#if (_RESULT_WIDTH == 1)
 #define _D_TYPE unsigned char
#elif (_RESULT_WIDTH == 2)
 #define _D_TYPE unsigned int
#else
 #define _D_TYPE unsigned long
#endif

// Function prototypes
extern unsigned _D_TYPE cksum(void);
extern const unsigned _D_TYPE _checksum0;