checksum.h File Reference

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Macros
#define	UBX_CSUM_A(...)   UBX_CSUM_A_(__VA_ARGS__)
	Macrobatics to compute UBX checksum at compile time.
#define	UBX_CSUM_A_(...)
#define	UBX_CSUM_A_I(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, ...)
#define	UBX_CSUM_B(...)   UBX_CSUM_B_(__VA_ARGS__)
#define	UBX_CSUM_B_(...)
#define	UBX_CSUM_B_I(len, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, ...)
#define	UBX_CSUM(...)   UBX_CSUM_A(__VA_ARGS__), UBX_CSUM_B(__VA_ARGS__)

Macro Definition Documentation

UBX_CSUM

#define UBX_CSUM

(

...

)

UBX_CSUM_A(__VA_ARGS__), UBX_CSUM_B(__VA_ARGS__)

UBX_CSUM_A

#define UBX_CSUM_A

(

...

)

UBX_CSUM_A_(__VA_ARGS__)

Macrobatics to compute UBX checksum at compile time.

UBX_CSUM_A_

#define UBX_CSUM_A_

(

...

)

Value:

                                      UBX_CSUM_A_I(__VA_ARGS__,                                            \
                                      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)

UBX_CSUM_A_I

#define UBX_CSUM_A_I	(		a1,
			a2,
			a3,
			a4,
			a5,
			a6,
			a7,
			a8,
			a9,
			a10,
			a11,
			a12,
			a13,
			a14,
			a15,
			a16,
			a17,
			a18,
			a19,
			a20,
			...
	)

Value:

        ((a1) + (a2) + (a3) + (a4) + (a5) + (a6) + (a7) + (a8) + (a9) + (a10) +                    \
         (a11) + (a12) + (a13) + (a14) + (a15) + (a16) + (a17) + (a18) + (a19) + (a20)) & 0xFF

UBX_CSUM_B

#define UBX_CSUM_B

(

...

)

UBX_CSUM_B_(__VA_ARGS__)

UBX_CSUM_B_

#define UBX_CSUM_B_

(

...

)

Value:

                                     UBX_CSUM_B_I(NUM_VA_ARGS(__VA_ARGS__), __VA_ARGS__,                           \
                                     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)

UBX_CSUM_B_I

#define UBX_CSUM_B_I	(		len,
			a1,
			a2,
			a3,
			a4,
			a5,
			a6,
			a7,
			a8,
			a9,
			a10,
			a11,
			a12,
			a13,
			a14,
			a15,
			a16,
			a17,
			a18,
			a19,
			a20,
			...
	)

Value:

        (((len) * a1) + ((len - 1) * a2) + ((len - 2) * a3) + ((len - 3) * a4) +                   \
         ((len - 4) * a5) + ((len - 5) * a6) + ((len - 6) * a7) + ((len - 7) * a8) +               \
         ((len - 8) * a9) + ((len - 9) * a10) + ((len - 10) * a11) + ((len - 11) * a12) +          \
         ((len - 12) * a13) + ((len - 13) * a14) + ((len - 14) * a15) + ((len - 15) * a16) +       \
         ((len - 16) * a17) + ((len - 17) * a18) + ((len - 18) * a19) + ((len - 19) * a20)) & 0xFF