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cammckinnon/gist:2202649

Created March 26, 2012 03:24
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gistfile1.txt
/* borrowed partially from: http://stackoverflow.com/a/7577517/277800 */
#define B_0000 0
#define B_0001 1
#define B_0010 2
#define B_0011 3
#define B_0100 4
#define B_0101 5
#define B_0110 6
#define B_0111 7
#define B_1000 8
#define B_1001 9
#define B_1010 a
#define B_1011 b
#define B_1100 c
#define B_1101 d
#define B_1110 e
#define B_1111 f
// add a level of indirection to a preprocessor token
#define INDIRECT(a) a
// convert 4 bits to a hex character
#define B2H(b) B_##b
// bits -> hex
#define NIB(b1) INDIRECT(0x)##B2H(b1)
#define BYT(b1, b2) INDIRECT(0x)##B2H(b1)##B2H(b2)
#define WRD(b1, b2, b3, b4, b5, b6, b7, b8) INDIRECT(0x)##B2H(b1)##B2H(b2)##B2H(b3)##B2H(b4)##B2H(b5)##B2H(b6)##B2H(b7)##B2H(b8)
#define DWR(b1, b2, b3, b4, b5, b6, b7, b8, b11, b22, b33, b44, b55, b66, b77, b88) INDIRECT(0x)##B2H(b1)##B2H(b2)##B2H(b3)##B2H(b4)##B2H(b5)##B2H(b6)##B2H(b7)##B2H(b8)##B2H(b11)##B2H(b22)##B2H(b33)##B2H(b44)##B2H(b55)##B2H(b66)##B2H(b77)##B2H(b88)
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