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/* Binary constant generator macro | ||
By Tom Torfs - donated to the public domain | ||
*/ | ||
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/* All macro's evaluate to compile-time constants */ | ||
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/* *** helper macros *** / | ||
/* turn a numeric literal into a hex constant | ||
(avoids problems with leading zeroes) | ||
8-bit constants max value 0x11111111, always fits in unsigned long | ||
*/ | ||
#define HEX__(n) 0x##n##LU | ||
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/* 8-bit conversion function */ | ||
#define B8__(x) ((x&0x0000000FLU)?1:0) \ | ||
+((x&0x000000F0LU)?2:0) \ | ||
+((x&0x00000F00LU)?4:0) \ | ||
+((x&0x0000F000LU)?8:0) \ | ||
+((x&0x000F0000LU)?16:0) \ | ||
+((x&0x00F00000LU)?32:0) \ | ||
+((x&0x0F000000LU)?64:0) \ | ||
+((x&0xF0000000LU)?128:0) | ||
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/* *** user macros *** / | ||
/* for upto 8-bit binary constants */ | ||
#define B8(d) ((unsigned char)B8__(HEX__(d))) | ||
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/* for upto 16-bit binary constants, MSB first */ | ||
#define B16(dmsb,dlsb) (((unsigned short)B8(dmsb)<<8) \ | ||
+ B8(dlsb)) | ||
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/* for upto 32-bit binary constants, MSB first */ | ||
#define B32(dmsb,db2,db3,dlsb) (((unsigned long)B8(dmsb)<<24) \ | ||
+ ((unsigned long)B8(db2)<<16) \ | ||
+ ((unsigned long)B8(db3)<<8) \ | ||
+ B8(dlsb)) |
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